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authorV3n3RiX <venerix@gmail.com>2014-10-30 13:25:21 +0200
committerV3n3RiX <venerix@gmail.com>2014-10-30 13:25:21 +0200
commitb55c33c0cf0857b24be3997951aaedb78f776279 (patch)
tree2cc030804c94d5038000101450bb00f377b2435d
parent24934e623441310f644e5f72855b0f2bf9f3cd1a (diff)
Somebody called for an exterminator?...starting the big purge of deprecated ebuilds
-rw-r--r--sys-kernel/debian-sources-lts/Manifest4
-rw-r--r--sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.41-r1.ebuild161
-rw-r--r--sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.41.ebuild156
-rw-r--r--sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.43-r1.ebuild161
-rw-r--r--sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.43.ebuild156
-rw-r--r--sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.46.ebuild162
-rwxr-xr-xsys-kernel/debian-sources-lts/files/config-extract216
-rw-r--r--sys-kernel/debian-sources-lts/files/debian-sources-2.6.32.30-bridgemac.patch15
-rw-r--r--sys-kernel/debian-sources-lts/files/debian-sources-2.6.38.3-bridgemac.patch15
-rw-r--r--sys-kernel/debian-sources-lts/metadata.xml6
-rw-r--r--sys-kernel/debian-sources/Manifest16
-rw-r--r--sys-kernel/debian-sources/debian-sources-3.10.11.ebuild145
-rw-r--r--sys-kernel/debian-sources/debian-sources-3.12.3.ebuild145
-rwxr-xr-xsys-kernel/debian-sources/files/config-extract219
-rw-r--r--sys-kernel/debian-sources/files/debian-sources-3.10.11-xfs-libcrc32c-fix.patch21
-rw-r--r--sys-kernel/debian-sources/files/debian-sources-3.12.3-xfs-libcrc32c-fix.patch21
-rw-r--r--sys-kernel/debian-sources/metadata.xml10
-rw-r--r--sys-kernel/kogaion-sources/files/desktop/0001-block-cgroups-kconfig-build-bits-for-BFQ-v7-3.10.patch103
-rw-r--r--sys-kernel/kogaion-sources/files/desktop/0002-block-introduce-the-BFQ-v7-I-O-sched-for-3.10.patch5969
-rw-r--r--sys-kernel/kogaion-sources/files/desktop/0003-block-bfq-add-Early-Queue-Merge-EQM-to-BFQ-v7-for-3.10.0.patch1034
-rw-r--r--sys-kernel/kogaion-sources/files/desktop/3.10-ck1.patch8732
-rw-r--r--sys-kernel/kogaion-sources/files/desktop/change-default-console-loglevel.patch13
-rw-r--r--sys-kernel/kogaion-sources/files/desktop/criu-no-expert.patch23
-rw-r--r--sys-kernel/kogaion-sources/files/desktop/enable_haswell_pstate_driver.patch33
-rw-r--r--sys-kernel/kogaion-sources/files/desktop/set_kogaion_extraversion_in_makefile.patch12
-rw-r--r--sys-kernel/kogaion-sources/files/desktop/uksm-0.1.2.2-for-v3.10.patch7064
-rw-r--r--sys-kernel/kogaion-sources/files/security/0001-x86-x32-Correct-invalid-use-of-user-timespec-in-the-.patch80
-rw-r--r--sys-kernel/kogaion-sources/kogaion-sources-3.10.25.ebuild55
-rw-r--r--sys-kernel/kogaion-sources/kogaion-sources-3.14.20.ebuild (renamed from sys-kernel/kogaion-sources/kogaion-sources-3.12.10.ebuild)0
-rw-r--r--sys-kernel/rogentos-sources/Manifest2
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.10.26.ebuild22
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.10.27.ebuild22
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.11.10.ebuild22
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.12.10.ebuild22
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.12.7.ebuild22
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.12.8.ebuild22
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.2-r2.ebuild19
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.4.76.ebuild22
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.4.77.ebuild22
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.8.13.ebuild21
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources-3.9.11.ebuild22
-rw-r--r--sys-kernel/rogentos-sources/rogentos-sources.skel22
42 files changed, 0 insertions, 25009 deletions
diff --git a/sys-kernel/debian-sources-lts/Manifest b/sys-kernel/debian-sources-lts/Manifest
deleted file mode 100644
index c5e32f78..00000000
--- a/sys-kernel/debian-sources-lts/Manifest
+++ /dev/null
@@ -1,4 +0,0 @@
-DIST linux-2.6_2.6.32-41.diff.gz 15924342 SHA256 4c22fc57902393b12b12fcc3c8ed04d7a99eb4fe311131fb1f647d48a9d85c19
-DIST linux-2.6_2.6.32-43.diff.gz 16261810 SHA256 57f8a8021e590c1c0cb65afccd3f6e78716314db3ac78fae8ddaebb2ebf36801
-DIST linux-2.6_2.6.32-46.diff.gz 16321966 SHA256 8e6220b01f30ee9acb3ae8a6a7825f054ddbe447914cd0a6d60cfb29b7553467 SHA512 047407593c281c2b9920acc6fa173c414d582823e66601894648050828d14c6fa3a07b99c48b53fcd16d6a1fa128f705246f1fa0c3d6715fa3e2a5fa7a7d083a WHIRLPOOL 68e480843569cd802d9c6d3390136f1aad149142527b1cedff8c9cd56ca764a8a83e2f8b88569ef9dbfc8569bbf18062abc6490a31a7ff352f567a2345cabc0c
-DIST linux-2.6_2.6.32.orig.tar.gz 82167227 SHA256 e9858964b9d836293e1fe3736658ab1ba20c5897b504ddb09dd4b64ec05a043d
diff --git a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.41-r1.ebuild b/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.41-r1.ebuild
deleted file mode 100644
index db111499..00000000
--- a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.41-r1.ebuild
+++ /dev/null
@@ -1,161 +0,0 @@
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=2
-
-inherit mount-boot
-
-SLOT=$PVR
-CKV=2.6.32
-KV_FULL=${PN}-${PVR}
-KERNEL_ARCHIVE="linux-2.6_2.6.32.orig.tar.gz"
-RESTRICT="binchecks strip"
-# based on : http://packages.ubuntu.com/maverick/linux-image-2.6.35-22-server
-LICENSE="GPL-2"
-KEYWORDS="*"
-IUSE="openvz binary"
-DEPEND="binary? ( >=sys-kernel/genkernel-3.4.12.6-r4 )"
-RDEPEND="binary? ( || ( >=sys-fs/udev-160 >=virtual/udev-171 ) )"
-DESCRIPTION="Debian Sources (and optional binary kernel)"
-HOMEPAGE="http://www.debian.org"
-MAINPATCH="linux-2.6_2.6.32-41.diff.gz"
-SRC_URI="http://ftp.bg.debian.org/debian/pool/main/l/linux-2.6/${KERNEL_ARCHIVE}
- http://ftp.bg.debian.org/debian/pool/main/l/linux-2.6/${MAINPATCH}"
-S="$WORKDIR/linux-${CKV}"
-
-apply() {
- p=$1; shift
- case "${p##*.}" in
- gz)
- ca="gzip -dc"
- ;;
- bz2)
- ca="bzip2 -dc"
- ;;
- xz)
- ca="xz -dc"
- ;;
- *)
- ca="cat"
- ;;
- esac
- [ ! -e $p ] && die "patch $p not found"
- echo "Applying patch $p"; $ca $p | patch $* || die "patch $p failed"
-}
-
-pkg_setup() {
- unset ARCH; unset LDFLAGS #will interfere with Makefile if set
-}
-
-src_unpack() {
- cd ${WORKDIR}
- unpack ${KERNEL_ARCHIVE}
-}
-
-src_prepare() {
- cd ${WORKDIR}
- apply $DISTDIR/$MAINPATCH -p1
-
- # debian-specific stuff....
-
- mv linux-* ${S##*/} || die
- mv debian ${S##*/}/ || die
- cd ${S}
- sed -i \
- -e 's/^sys.path.append.*$/sys.path.append(".\/debian\/lib\/python")/' \
- -e 's/^_default_home =.*$/_default_home = ".\/debian\/patches"/' \
- debian/bin/patch.apply || die
- python2 debian/bin/patch.apply $KV_DEB || die
- if use openvz
- then
- python2 debian/bin/patch.apply -a $ARCH -f openvz || die
- fi
-
- # end of debian-specific stuff...
-
- sed -i -e "s:^\(EXTRAVERSION =\).*:\1 ${EXTRAVERSION}:" Makefile || die
- sed -i -e 's:#export\tINSTALL_PATH:export\tINSTALL_PATH:' Makefile || die
- rm -f .config >/dev/null
- cp -a debian ${T} || die "couldn't back up debian dir (will be wiped by mrproper)"
- make -s mrproper || die "make mrproper failed"
- cp -a ${T}/debian . || die "couldn't restore debian directory"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
- #mv "${TEMP}/configs" "${S}" || die
- cd ${S}
- local opts
- use openvz && opts="openvz"
- local myarch="amd64"
- [ "$ARCH" = "x86" ] && myarch="i386"
- cp ${FILESDIR}/config-extract . || die
- chmod +x config-extract || die
- ./config-extract ${myarch} ${opts} || die
- cp .config ${T}/config || die
- make -s mrproper || die "make mrproper failed"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
-}
-
-src_compile() {
- ! use binary && return
- install -d ${WORKDIR}/out/{lib,boot}
- install -d ${T}/{cache,twork}
- install -d $WORKDIR/build $WORKDIR/out/lib/firmware
- genkernel \
- --no-save-config \
- --kernel-config="$T/config" \
- --kernname="${PN}" \
- --build-src="$S" \
- --build-dst=${WORKDIR}/build \
- --makeopts="${MAKEOPTS}" \
- --firmware-dst=${WORKDIR}/out/lib/firmware \
- --cachedir="${T}/cache" \
- --tempdir="${T}/twork" \
- --logfile="${WORKDIR}/genkernel.log" \
- --bootdir="${WORKDIR}/out/boot" \
- --lvm \
- --luks \
- --iscsi \
- --module-prefix="${WORKDIR}/out" \
- all || die "genkernel failed"
-}
-
-src_install() {
- # copy sources into place:
- dodir /usr/src
- cp -a ${S} ${D}/usr/src/linux-${P} || die
- cd ${D}/usr/src/linux-${P}
- # prepare for real-world use and 3rd-party module building:
- make mrproper || die
- cp ${T}/config .config || die
- cp -a ${T}/debian debian || die
- yes "" | make oldconfig || die
- # if we didn't use genkernel, we're done. The kernel source tree is left in
- # an unconfigured state - you can't compile 3rd-party modules against it yet.
- use binary || return
- make prepare || die
- make scripts || die
- # OK, now the source tree is configured to allow 3rd-party modules to be
- # built against it, since we want that to work since we have a binary kernel
- # built.
- cp -a ${WORKDIR}/out/* ${D}/ || die "couldn't copy output files into place"
- # module symlink fixup:
- rm -f ${D}/lib/modules/*/source || die
- rm -f ${D}/lib/modules/*/build || die
- cd ${D}/lib/modules
- # module strip:
- find -iname *.ko -exec strip --strip-debug {} \;
- # back to the symlink fixup:
- local moddir="$(ls -d [23]*)"
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/source || die
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/build || die
-
- # Fixes FL-14
- cp "${WORKDIR}/build/System.map" "${D}/usr/src/linux-${P}/" || die
- cp "${WORKDIR}/build/Module.symvers" "${D}/usr/src/linux-${P}/" || die
-
-}
-
-pkg_postinst() {
- if [ ! -e ${ROOT}usr/src/linux ]
- then
- ln -s linux-${P} ${ROOT}usr/src/linux
- fi
-}
diff --git a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.41.ebuild b/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.41.ebuild
deleted file mode 100644
index 2b9f5974..00000000
--- a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.41.ebuild
+++ /dev/null
@@ -1,156 +0,0 @@
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=2
-
-inherit mount-boot
-
-SLOT=$PVR
-CKV=2.6.32
-KV_FULL=${PN}-${PVR}
-KERNEL_ARCHIVE="linux-2.6_2.6.32.orig.tar.gz"
-RESTRICT="binchecks strip"
-# based on : http://packages.ubuntu.com/maverick/linux-image-2.6.35-22-server
-LICENSE="GPL-2"
-KEYWORDS="*"
-IUSE="openvz binary"
-DEPEND="binary? ( >=sys-kernel/genkernel-3.4.12.6-r4 )"
-RDEPEND="binary? ( || ( >=sys-fs/udev-160 >=virtual/udev-171 ) )"
-DESCRIPTION="Debian Sources (and optional binary kernel)"
-HOMEPAGE="http://www.debian.org"
-MAINPATCH="linux-2.6_2.6.32-41.diff.gz"
-SRC_URI="http://ftp.bg.debian.org/debian/pool/main/l/linux-2.6/${KERNEL_ARCHIVE}
- http://ftp.bg.debian.org/debian/pool/main/l/linux-2.6/${MAINPATCH}"
-S="$WORKDIR/linux-${CKV}"
-
-apply() {
- p=$1; shift
- case "${p##*.}" in
- gz)
- ca="gzip -dc"
- ;;
- bz2)
- ca="bzip2 -dc"
- ;;
- xz)
- ca="xz -dc"
- ;;
- *)
- ca="cat"
- ;;
- esac
- [ ! -e $p ] && die "patch $p not found"
- echo "Applying patch $p"; $ca $p | patch $* || die "patch $p failed"
-}
-
-pkg_setup() {
- unset ARCH; unset LDFLAGS #will interfere with Makefile if set
-}
-
-src_unpack() {
- cd ${WORKDIR}
- unpack ${KERNEL_ARCHIVE}
-}
-
-src_prepare() {
- cd ${WORKDIR}
- apply $DISTDIR/$MAINPATCH -p1
-
- # debian-specific stuff....
-
- mv linux-* ${S##*/} || die
- mv debian ${S##*/}/ || die
- cd ${S}
- sed -i \
- -e 's/^sys.path.append.*$/sys.path.append(".\/debian\/lib\/python")/' \
- -e 's/^_default_home =.*$/_default_home = ".\/debian\/patches"/' \
- debian/bin/patch.apply || die
- python2 debian/bin/patch.apply $KV_DEB || die
- if use openvz
- then
- python2 debian/bin/patch.apply -a $ARCH -f openvz || die
- fi
-
- # end of debian-specific stuff...
-
- sed -i -e "s:^\(EXTRAVERSION =\).*:\1 ${EXTRAVERSION}:" Makefile || die
- sed -i -e 's:#export\tINSTALL_PATH:export\tINSTALL_PATH:' Makefile || die
- rm -f .config >/dev/null
- cp -a debian ${T} || die "couldn't back up debian dir (will be wiped by mrproper)"
- make -s mrproper || die "make mrproper failed"
- cp -a ${T}/debian . || die "couldn't restore debian directory"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
- #mv "${TEMP}/configs" "${S}" || die
- cd ${S}
- local opts
- use openvz && opts="openvz"
- local myarch="amd64"
- [ "$ARCH" = "x86" ] && myarch="i386"
- cp ${FILESDIR}/config-extract . || die
- chmod +x config-extract || die
- ./config-extract ${myarch} ${opts} || die
- cp .config ${T}/config || die
- make -s mrproper || die "make mrproper failed"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
-}
-
-src_compile() {
- ! use binary && return
- install -d ${WORKDIR}/out/{lib,boot}
- install -d ${T}/{cache,twork}
- install -d $WORKDIR/build $WORKDIR/out/lib/firmware
- genkernel \
- --no-save-config \
- --kernel-config="$T/config" \
- --kernname="${PN}" \
- --build-src="$S" \
- --build-dst=${WORKDIR}/build \
- --makeopts="${MAKEOPTS}" \
- --firmware-dst=${WORKDIR}/out/lib/firmware \
- --cachedir="${T}/cache" \
- --tempdir="${T}/twork" \
- --logfile="${WORKDIR}/genkernel.log" \
- --bootdir="${WORKDIR}/out/boot" \
- --lvm \
- --luks \
- --iscsi \
- --module-prefix="${WORKDIR}/out" \
- all || die "genkernel failed"
-}
-
-src_install() {
- # copy sources into place:
- dodir /usr/src
- cp -a ${S} ${D}/usr/src/linux-${P} || die
- cd ${D}/usr/src/linux-${P}
- # prepare for real-world use and 3rd-party module building:
- make mrproper || die
- cp ${T}/config .config || die
- cp -a ${T}/debian debian || die
- yes "" | make oldconfig || die
- # if we didn't use genkernel, we're done. The kernel source tree is left in
- # an unconfigured state - you can't compile 3rd-party modules against it yet.
- use binary || return
- make prepare || die
- make scripts || die
- # OK, now the source tree is configured to allow 3rd-party modules to be
- # built against it, since we want that to work since we have a binary kernel
- # built.
- cp -a ${WORKDIR}/out/* ${D}/ || die "couldn't copy output files into place"
- # module symlink fixup:
- rm -f ${D}/lib/modules/*/source || die
- rm -f ${D}/lib/modules/*/build || die
- cd ${D}/lib/modules
- # module strip:
- find -iname *.ko -exec strip --strip-debug {} \;
- # back to the symlink fixup:
- local moddir="$(ls -d [23]*)"
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/source || die
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/build || die
-}
-
-pkg_postinst() {
- if [ ! -e ${ROOT}usr/src/linux ]
- then
- ln -s linux-${P} ${ROOT}usr/src/linux
- fi
-}
diff --git a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.43-r1.ebuild b/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.43-r1.ebuild
deleted file mode 100644
index 36225eef..00000000
--- a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.43-r1.ebuild
+++ /dev/null
@@ -1,161 +0,0 @@
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=2
-
-inherit mount-boot
-
-SLOT=$PVR
-CKV=2.6.32
-KV_FULL=${PN}-${PVR}
-KERNEL_ARCHIVE="linux-2.6_2.6.32.orig.tar.gz"
-RESTRICT="binchecks strip"
-# based on : http://packages.ubuntu.com/maverick/linux-image-2.6.35-22-server
-LICENSE="GPL-2"
-KEYWORDS="*"
-IUSE="openvz binary"
-DEPEND="binary? ( >=sys-kernel/genkernel-3.4.12.6-r4 )"
-RDEPEND="binary? ( || ( >=sys-fs/udev-160 >=virtual/udev-171 ) )"
-DESCRIPTION="Debian Sources (and optional binary kernel)"
-HOMEPAGE="http://www.debian.org"
-MAINPATCH="linux-2.6_2.6.32-43.diff.gz"
-SRC_URI="http://ftp.bg.debian.org/debian/pool/main/l/linux-2.6/${KERNEL_ARCHIVE}
- http://ftp.bg.debian.org/debian/pool/main/l/linux-2.6/${MAINPATCH}"
-S="$WORKDIR/linux-${CKV}"
-
-apply() {
- p=$1; shift
- case "${p##*.}" in
- gz)
- ca="gzip -dc"
- ;;
- bz2)
- ca="bzip2 -dc"
- ;;
- xz)
- ca="xz -dc"
- ;;
- *)
- ca="cat"
- ;;
- esac
- [ ! -e $p ] && die "patch $p not found"
- echo "Applying patch $p"; $ca $p | patch $* || die "patch $p failed"
-}
-
-pkg_setup() {
- unset ARCH; unset LDFLAGS #will interfere with Makefile if set
-}
-
-src_unpack() {
- cd ${WORKDIR}
- unpack ${KERNEL_ARCHIVE}
-}
-
-src_prepare() {
- cd ${WORKDIR}
- apply $DISTDIR/$MAINPATCH -p1
-
- # debian-specific stuff....
-
- mv linux-* ${S##*/} || die
- mv debian ${S##*/}/ || die
- cd ${S}
- sed -i \
- -e 's/^sys.path.append.*$/sys.path.append(".\/debian\/lib\/python")/' \
- -e 's/^_default_home =.*$/_default_home = ".\/debian\/patches"/' \
- debian/bin/patch.apply || die
- python2 debian/bin/patch.apply $KV_DEB || die
- if use openvz
- then
- python2 debian/bin/patch.apply -a $ARCH -f openvz || die
- fi
-
- # end of debian-specific stuff...
-
- sed -i -e "s:^\(EXTRAVERSION =\).*:\1 ${EXTRAVERSION}:" Makefile || die
- sed -i -e 's:#export\tINSTALL_PATH:export\tINSTALL_PATH:' Makefile || die
- rm -f .config >/dev/null
- cp -a debian ${T} || die "couldn't back up debian dir (will be wiped by mrproper)"
- make -s mrproper || die "make mrproper failed"
- cp -a ${T}/debian . || die "couldn't restore debian directory"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
- #mv "${TEMP}/configs" "${S}" || die
- cd ${S}
- local opts
- use openvz && opts="openvz"
- local myarch="amd64"
- [ "$ARCH" = "x86" ] && myarch="i386"
- cp ${FILESDIR}/config-extract . || die
- chmod +x config-extract || die
- ./config-extract ${myarch} ${opts} || die
- cp .config ${T}/config || die
- make -s mrproper || die "make mrproper failed"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
-}
-
-src_compile() {
- ! use binary && return
- install -d ${WORKDIR}/out/{lib,boot}
- install -d ${T}/{cache,twork}
- install -d $WORKDIR/build $WORKDIR/out/lib/firmware
- genkernel \
- --no-save-config \
- --kernel-config="$T/config" \
- --kernname="${PN}" \
- --build-src="$S" \
- --build-dst=${WORKDIR}/build \
- --makeopts="${MAKEOPTS}" \
- --firmware-dst=${WORKDIR}/out/lib/firmware \
- --cachedir="${T}/cache" \
- --tempdir="${T}/twork" \
- --logfile="${WORKDIR}/genkernel.log" \
- --bootdir="${WORKDIR}/out/boot" \
- --lvm \
- --luks \
- --iscsi \
- --module-prefix="${WORKDIR}/out" \
- all || die "genkernel failed"
-}
-
-src_install() {
- # copy sources into place:
- dodir /usr/src
- cp -a ${S} ${D}/usr/src/linux-${P} || die
- cd ${D}/usr/src/linux-${P}
- # prepare for real-world use and 3rd-party module building:
- make mrproper || die
- cp ${T}/config .config || die
- cp -a ${T}/debian debian || die
- yes "" | make oldconfig || die
- # if we didn't use genkernel, we're done. The kernel source tree is left in
- # an unconfigured state - you can't compile 3rd-party modules against it yet.
- use binary || return
- make prepare || die
- make scripts || die
- # OK, now the source tree is configured to allow 3rd-party modules to be
- # built against it, since we want that to work since we have a binary kernel
- # built.
- cp -a ${WORKDIR}/out/* ${D}/ || die "couldn't copy output files into place"
- # module symlink fixup:
- rm -f ${D}/lib/modules/*/source || die
- rm -f ${D}/lib/modules/*/build || die
- cd ${D}/lib/modules
- # module strip:
- find -iname *.ko -exec strip --strip-debug {} \;
- # back to the symlink fixup:
- local moddir="$(ls -d [23]*)"
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/source || die
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/build || die
-
- # Fixes FL-14
- cp "${WORKDIR}/build/System.map" "${D}/usr/src/linux-${P}/" || die
- cp "${WORKDIR}/build/Module.symvers" "${D}/usr/src/linux-${P}/" || die
-
-}
-
-pkg_postinst() {
- if [ ! -e ${ROOT}usr/src/linux ]
- then
- ln -s linux-${P} ${ROOT}usr/src/linux
- fi
-}
diff --git a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.43.ebuild b/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.43.ebuild
deleted file mode 100644
index ee437a14..00000000
--- a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.43.ebuild
+++ /dev/null
@@ -1,156 +0,0 @@
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=2
-
-inherit mount-boot
-
-SLOT=$PVR
-CKV=2.6.32
-KV_FULL=${PN}-${PVR}
-KERNEL_ARCHIVE="linux-2.6_2.6.32.orig.tar.gz"
-RESTRICT="binchecks strip"
-# based on : http://packages.ubuntu.com/maverick/linux-image-2.6.35-22-server
-LICENSE="GPL-2"
-KEYWORDS="*"
-IUSE="openvz binary"
-DEPEND="binary? ( >=sys-kernel/genkernel-3.4.12.6-r4 )"
-RDEPEND="binary? ( || ( >=sys-fs/udev-160 >=virtual/udev-171 ) )"
-DESCRIPTION="Debian Sources (and optional binary kernel)"
-HOMEPAGE="http://www.debian.org"
-MAINPATCH="linux-2.6_2.6.32-43.diff.gz"
-SRC_URI="http://ftp.bg.debian.org/debian/pool/main/l/linux-2.6/${KERNEL_ARCHIVE}
- http://ftp.bg.debian.org/debian/pool/main/l/linux-2.6/${MAINPATCH}"
-S="$WORKDIR/linux-${CKV}"
-
-apply() {
- p=$1; shift
- case "${p##*.}" in
- gz)
- ca="gzip -dc"
- ;;
- bz2)
- ca="bzip2 -dc"
- ;;
- xz)
- ca="xz -dc"
- ;;
- *)
- ca="cat"
- ;;
- esac
- [ ! -e $p ] && die "patch $p not found"
- echo "Applying patch $p"; $ca $p | patch $* || die "patch $p failed"
-}
-
-pkg_setup() {
- unset ARCH; unset LDFLAGS #will interfere with Makefile if set
-}
-
-src_unpack() {
- cd ${WORKDIR}
- unpack ${KERNEL_ARCHIVE}
-}
-
-src_prepare() {
- cd ${WORKDIR}
- apply $DISTDIR/$MAINPATCH -p1
-
- # debian-specific stuff....
-
- mv linux-* ${S##*/} || die
- mv debian ${S##*/}/ || die
- cd ${S}
- sed -i \
- -e 's/^sys.path.append.*$/sys.path.append(".\/debian\/lib\/python")/' \
- -e 's/^_default_home =.*$/_default_home = ".\/debian\/patches"/' \
- debian/bin/patch.apply || die
- python2 debian/bin/patch.apply $KV_DEB || die
- if use openvz
- then
- python2 debian/bin/patch.apply -a $ARCH -f openvz || die
- fi
-
- # end of debian-specific stuff...
-
- sed -i -e "s:^\(EXTRAVERSION =\).*:\1 ${EXTRAVERSION}:" Makefile || die
- sed -i -e 's:#export\tINSTALL_PATH:export\tINSTALL_PATH:' Makefile || die
- rm -f .config >/dev/null
- cp -a debian ${T} || die "couldn't back up debian dir (will be wiped by mrproper)"
- make -s mrproper || die "make mrproper failed"
- cp -a ${T}/debian . || die "couldn't restore debian directory"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
- #mv "${TEMP}/configs" "${S}" || die
- cd ${S}
- local opts
- use openvz && opts="openvz"
- local myarch="amd64"
- [ "$ARCH" = "x86" ] && myarch="i386"
- cp ${FILESDIR}/config-extract . || die
- chmod +x config-extract || die
- ./config-extract ${myarch} ${opts} || die
- cp .config ${T}/config || die
- make -s mrproper || die "make mrproper failed"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
-}
-
-src_compile() {
- ! use binary && return
- install -d ${WORKDIR}/out/{lib,boot}
- install -d ${T}/{cache,twork}
- install -d $WORKDIR/build $WORKDIR/out/lib/firmware
- genkernel \
- --no-save-config \
- --kernel-config="$T/config" \
- --kernname="${PN}" \
- --build-src="$S" \
- --build-dst=${WORKDIR}/build \
- --makeopts="${MAKEOPTS}" \
- --firmware-dst=${WORKDIR}/out/lib/firmware \
- --cachedir="${T}/cache" \
- --tempdir="${T}/twork" \
- --logfile="${WORKDIR}/genkernel.log" \
- --bootdir="${WORKDIR}/out/boot" \
- --lvm \
- --luks \
- --iscsi \
- --module-prefix="${WORKDIR}/out" \
- all || die "genkernel failed"
-}
-
-src_install() {
- # copy sources into place:
- dodir /usr/src
- cp -a ${S} ${D}/usr/src/linux-${P} || die
- cd ${D}/usr/src/linux-${P}
- # prepare for real-world use and 3rd-party module building:
- make mrproper || die
- cp ${T}/config .config || die
- cp -a ${T}/debian debian || die
- yes "" | make oldconfig || die
- # if we didn't use genkernel, we're done. The kernel source tree is left in
- # an unconfigured state - you can't compile 3rd-party modules against it yet.
- use binary || return
- make prepare || die
- make scripts || die
- # OK, now the source tree is configured to allow 3rd-party modules to be
- # built against it, since we want that to work since we have a binary kernel
- # built.
- cp -a ${WORKDIR}/out/* ${D}/ || die "couldn't copy output files into place"
- # module symlink fixup:
- rm -f ${D}/lib/modules/*/source || die
- rm -f ${D}/lib/modules/*/build || die
- cd ${D}/lib/modules
- # module strip:
- find -iname *.ko -exec strip --strip-debug {} \;
- # back to the symlink fixup:
- local moddir="$(ls -d [23]*)"
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/source || die
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/build || die
-}
-
-pkg_postinst() {
- if [ ! -e ${ROOT}usr/src/linux ]
- then
- ln -s linux-${P} ${ROOT}usr/src/linux
- fi
-}
diff --git a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.46.ebuild b/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.46.ebuild
deleted file mode 100644
index 94e1100a..00000000
--- a/sys-kernel/debian-sources-lts/debian-sources-lts-2.6.32.46.ebuild
+++ /dev/null
@@ -1,162 +0,0 @@
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=2
-
-inherit mount-boot
-
-SLOT=$PVR
-CKV=2.6.32
-KV_FULL=${PN}-${PVR}
-KERNEL_ARCHIVE="linux-2.6_2.6.32.orig.tar.gz"
-RESTRICT="binchecks strip"
-# based on : http://packages.ubuntu.com/maverick/linux-image-2.6.35-22-server
-LICENSE="GPL-2"
-KEYWORDS="*"
-IUSE="openvz binary"
-DEPEND="binary? ( >=sys-kernel/genkernel-3.4.12.6-r4 )"
-RDEPEND="binary? ( || ( >=sys-fs/udev-160 >=virtual/udev-171 ) )"
-DESCRIPTION="Debian Sources (and optional binary kernel)"
-HOMEPAGE="http://www.debian.org"
-MAINPATCH="linux-2.6_2.6.32-46.diff.gz"
-SRC_URI="http://ftp.osuosl.org/pub/funtoo/distfiles/${KERNEL_ARCHIVE}
- http://ftp.osuosl.org/pub/funtoo/distfiles/${MAINPATCH}"
-RESTRICT="mirror"
-S="$WORKDIR/linux-${CKV}"
-
-apply() {
- p=$1; shift
- case "${p##*.}" in
- gz)
- ca="gzip -dc"
- ;;
- bz2)
- ca="bzip2 -dc"
- ;;
- xz)
- ca="xz -dc"
- ;;
- *)
- ca="cat"
- ;;
- esac
- [ ! -e $p ] && die "patch $p not found"
- echo "Applying patch $p"; $ca $p | patch $* || die "patch $p failed"
-}
-
-pkg_setup() {
- unset ARCH; unset LDFLAGS #will interfere with Makefile if set
-}
-
-src_unpack() {
- cd ${WORKDIR}
- unpack ${KERNEL_ARCHIVE}
-}
-
-src_prepare() {
- cd ${WORKDIR}
- apply $DISTDIR/$MAINPATCH -p1
-
- # debian-specific stuff....
-
- mv linux-* ${S##*/} || die
- mv debian ${S##*/}/ || die
- cd ${S}
- sed -i \
- -e 's/^sys.path.append.*$/sys.path.append(".\/debian\/lib\/python")/' \
- -e 's/^_default_home =.*$/_default_home = ".\/debian\/patches"/' \
- debian/bin/patch.apply || die
- python2 debian/bin/patch.apply $KV_DEB || die
- if use openvz
- then
- python2 debian/bin/patch.apply -a $ARCH -f openvz || die
- fi
-
- # end of debian-specific stuff...
-
- sed -i -e "s:^\(EXTRAVERSION =\).*:\1 ${EXTRAVERSION}:" Makefile || die
- sed -i -e 's:#export\tINSTALL_PATH:export\tINSTALL_PATH:' Makefile || die
- rm -f .config >/dev/null
- cp -a debian ${T} || die "couldn't back up debian dir (will be wiped by mrproper)"
- make -s mrproper || die "make mrproper failed"
- cp -a ${T}/debian . || die "couldn't restore debian directory"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
- #mv "${TEMP}/configs" "${S}" || die
- cd ${S}
- local opts
- use openvz && opts="openvz"
- local myarch="amd64"
- [ "$ARCH" = "x86" ] && myarch="i386"
- cp ${FILESDIR}/config-extract . || die
- chmod +x config-extract || die
- ./config-extract ${myarch} ${opts} || die
- cp .config ${T}/config || die
- make -s mrproper || die "make mrproper failed"
- make -s include/linux/version.h || die "make include/linux/version.h failed"
-}
-
-src_compile() {
- ! use binary && return
- install -d ${WORKDIR}/out/{lib,boot}
- install -d ${T}/{cache,twork}
- install -d $WORKDIR/build $WORKDIR/out/lib/firmware
- genkernel \
- --no-save-config \
- --kernel-config="$T/config" \
- --kernname="${PN}" \
- --build-src="$S" \
- --build-dst=${WORKDIR}/build \
- --makeopts="${MAKEOPTS}" \
- --firmware-dst=${WORKDIR}/out/lib/firmware \
- --cachedir="${T}/cache" \
- --tempdir="${T}/twork" \
- --logfile="${WORKDIR}/genkernel.log" \
- --bootdir="${WORKDIR}/out/boot" \
- --lvm \
- --luks \
- --iscsi \
- --module-prefix="${WORKDIR}/out" \
- all || die "genkernel failed"
-}
-
-src_install() {
- # copy sources into place:
- dodir /usr/src
- cp -a ${S} ${D}/usr/src/linux-${P} || die
- cd ${D}/usr/src/linux-${P}
- # prepare for real-world use and 3rd-party module building:
- make mrproper || die
- cp ${T}/config .config || die
- cp -a ${T}/debian debian || die
- yes "" | make oldconfig || die
- # if we didn't use genkernel, we're done. The kernel source tree is left in
- # an unconfigured state - you can't compile 3rd-party modules against it yet.
- use binary || return
- make prepare || die
- make scripts || die
- # OK, now the source tree is configured to allow 3rd-party modules to be
- # built against it, since we want that to work since we have a binary kernel
- # built.
- cp -a ${WORKDIR}/out/* ${D}/ || die "couldn't copy output files into place"
- # module symlink fixup:
- rm -f ${D}/lib/modules/*/source || die
- rm -f ${D}/lib/modules/*/build || die
- cd ${D}/lib/modules
- # module strip:
- find -iname *.ko -exec strip --strip-debug {} \;
- # back to the symlink fixup:
- local moddir="$(ls -d [23]*)"
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/source || die
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/build || die
-
- # Fixes FL-14
- cp "${WORKDIR}/build/System.map" "${D}/usr/src/linux-${P}/" || die
- cp "${WORKDIR}/build/Module.symvers" "${D}/usr/src/linux-${P}/" || die
-
-}
-
-pkg_postinst() {
- if [ ! -e ${ROOT}usr/src/linux ]
- then
- ln -s linux-${P} ${ROOT}usr/src/linux
- fi
-}
diff --git a/sys-kernel/debian-sources-lts/files/config-extract b/sys-kernel/debian-sources-lts/files/config-extract
deleted file mode 100755
index fe15f548..00000000
--- a/sys-kernel/debian-sources-lts/files/config-extract
+++ /dev/null
@@ -1,216 +0,0 @@
-#!/usr/bin/python2
-
-import os,sys,re
-import getopt
-
-re_head = re.compile('^binary-arch_(.*)_real::')
-re_flav = re.compile('binary-arch-flavour')
-re_item = re.compile("[A-Z_]*='[^']*'")
-
-try:
- f=open("debian/rules.gen","r")
-except:
- print "Unable to open debian/rules.gen; can't continue."
- sys.exit(1)
-lines=f.readlines()
-f.close()
-
-line=0
-
-configlist = []
-configdict = {}
-
-# scan Debian rules.gen file and gather all variable data into a more useable format:
-
-while line < len(lines):
- head_match = re_head.match(lines[line])
- if not head_match:
- line += 1
- continue
- config_name = head_match.group(1)
- line += 1
- if not re_flav.findall(lines[line]):
- continue
- lsplit = re_item.findall(lines[line])
- groovydict = {}
- for item in lsplit:
- kv = item.split("=",1)
- if len(kv) < 2:
- continue
- groovydict[kv[0]] = kv[1][1:-1]
- configlist.append(config_name)
- configdict[config_name] = groovydict
- line += 1
-
-# We will organize the arch, featureset and flavors into cascading lists so
-# that we can present a nice clean chart of what's available to the user:
-
-archdict = {}
-
-for config in configlist:
- cs = config.split("_")
- if not cs[0] in archdict:
- archdict[cs[0]] = { }
- if cs[1] == "none":
- cs[1] = None
- if cs[1] not in archdict[cs[0]]:
- archdict[cs[0]][cs[1]] = []
- archdict[cs[0]][cs[1]].append(cs[2])
-
-arches = archdict.keys()
-arches.sort()
-
-features = [ None ]
-for arch in arches:
- for flav in archdict[arch]:
- if flav not in features:
- features.append(flav)
-
-PROG="config-extract"
-def usage():
- print """This work is free software.
-
-Copyright 2011 Funtoo Technologies. You can redistribute and/or modify it under
-the terms of the GNU General Public License version 3 as published by the Free
-Software Foundation. Alternatively you may (at your option) use any other
-license that has been publicly approved for use with this program by Funtoo
-Technologies (or its successors, if any.)
-
-usage: %s [options] arch [featureset] [subarch]
-
- -h --help print this usage and exit
- -l --list list all available kernel configurations
- -o --outfile specify kernel config outfile --
- defaults to .config in current directory
- [featureset] defaults to "none" if not specified
- [subarch] defaults to the only one available; otherwise required
-
-This program was written by Daniel Robbins for Funtoo Linux, for the purpose of
-easily and conveniently extracting Debian kernel configurations. To see a nice
-list of all available kernel configurations, use the --list option.
-
-Debian's kernel configs are specified internally in arch_featureset_flavor
-format, such as: "amd64_openvz_amd64". The featureset typically describes an
-optional kernel configuration such as "xen" or "openvz", while the flavor in
-Debian terminology typically refers to the sub-architecture of the CPU.
-
-When using this command, you must specify an arch. A featureset of "none" is
-assumed unless you specify one, and by default this program will pick the only
-available subarch if there is only one to choose from. If not, you will need to
-pick one (and the program will remind you to do this.)
-
-The kernel configuration will be written to ".config" in the current directory,
-or the location you specified using the -o/--outfile option.
-""" % PROG
- sys.exit(2)
-
-try:
- opts, args = getopt.getopt(sys.argv[1:], "o:hl", ["help", "list","outfile="])
-except getopt.GetoptError, err:
- print str(err)
- usage()
-
-mode="run"
-outfile=None
-for o,a in opts:
- if o in ("-h", "--help"):
- usage()
- elif o in ("-l", "--list"):
- mode="list"
- elif o in ("-o", "--outfile"):
- outfile = a
- else:
- assert False, "Unhandled option"
-if mode == "run":
- if len(args) < 1 or len(args) > 3:
- if len(args) == 0:
- print "Please specify an arch - one of: "+", ".join(arches)
- sys.exit(2)
- else:
- print "Too many arguments."
- usage()
- arch = args[0]
- if outfile == None:
- outfile = os.path.join(os.getcwd(),".config")
- featureset = None
- subarch = None
- if len(args) == 3:
- featureset = args[1]
- subarch = args[2]
- elif len(args) == 2:
- featureset = args[1]
-
-# print out optimized list of available kernel configurations:
-
-if mode=="list":
- print
- for flav in features:
- label = flav
- if label == None:
- label = "standard"
- print "====== %s featureset ======" % label
- print
- for arch in arches:
- if flav in archdict[arch]:
- if len(archdict[arch][flav]) == 1:
- print arch.rjust(12)
- else:
- flavlist = archdict[arch][flav]
- flavlist.sort()
- variants = ", ".join(flavlist)
- print arch.rjust(12) + ":", variants
- print
- sys.exit(0)
-
-# featureset defaults to None.
-
-if featureset not in archdict[arch]:
- print "Error: There is no '%s' featureset kernel config for arch '%s'. Exiting." % ( featureset, arch )
- sys.exit(2)
-
-# If a subarch is not specified (None), then we will auto-pick the subarch if only one is available.
-# Debian often has an "amd64" subarch for the "amd64" arch, rather than "none" as I might expect:
-
-if subarch == None:
- if len(archdict[arch][featureset]) == 1:
- subarch = archdict[arch][featureset][0]
- else:
- print "Error: there is more than one 'sub-architecture' for this arch."
- print "Please specify one of the following subarches as a secondary argument:"
- print ", ".join(archdict[arch][featureset])
- sys.exit(2)
-else:
- if subarch not in archdict[arch][featureset]:
- print "Error: specified sub-architecture '%s' is not available for this arch. Exiting." % subarch
- sys.exit(2)
-
-# We've done all our arg processing, now let's construct the master_key that we will use to look up the
-# proper settings to pass to Debian's debian/bin/kconfig.py command:
-
-master_key=arch
-if featureset == None:
- master_key += "_none"
-else:
- master_key += "_%s" % featureset
-if subarch == None:
- master_key += "_none"
-else:
- master_key += "_%s" % subarch
-if master_key not in configdict:
- print "Master key lookup failed; can't continue. Please report this bug."
- sys.exit(1)
-if "KCONFIG" not in configdict[master_key]:
- print "Unable to find KCONFIG option; can't continue. Please report this bug."
- sys.exit(1)
-cmd = "python2 debian/bin/kconfig.py '%s' %s" % ( outfile, configdict[master_key]["KCONFIG"] )
-if "KCONFIG_OPTIONS" in configdict[master_key]:
- cmd += " %s" % configdict[master_key]["KCONFIG_OPTIONS"]
-os.environ["PYTHONPATH"] = "debian/lib/python"
-retval = os.system(cmd)
-if retval == 0:
- print "Wrote %s kernel configuration to %s." % ( master_key, outfile )
- sys.exit(0)
-else:
- print "There was an error extracting the Debian kernel config."
- sys.exit(1)
-
diff --git a/sys-kernel/debian-sources-lts/files/debian-sources-2.6.32.30-bridgemac.patch b/sys-kernel/debian-sources-lts/files/debian-sources-2.6.32.30-bridgemac.patch
deleted file mode 100644
index b092c15a..00000000
--- a/sys-kernel/debian-sources-lts/files/debian-sources-2.6.32.30-bridgemac.patch
+++ /dev/null
@@ -1,15 +0,0 @@
-diff -urN linux/net/bridge/br_stp_if.c drobtmp/net/bridge/br_stp_if.c
---- linux/net/bridge/br_stp_if.c 2009-06-20 01:46:25.000000000 -0600
-+++ drobtmp/net/bridge/br_stp_if.c 2009-06-27 16:47:57.000000000 -0600
-@@ -163,10 +163,7 @@
- struct net_bridge_port *p;
-
- list_for_each_entry(p, &br->port_list, list) {
-- if (addr == br_mac_zero ||
-- memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
-- addr = p->dev->dev_addr;
--
-+ addr = p->dev->dev_addr;
- }
-
- if (compare_ether_addr(br->bridge_id.addr, addr))
diff --git a/sys-kernel/debian-sources-lts/files/debian-sources-2.6.38.3-bridgemac.patch b/sys-kernel/debian-sources-lts/files/debian-sources-2.6.38.3-bridgemac.patch
deleted file mode 100644
index b092c15a..00000000
--- a/sys-kernel/debian-sources-lts/files/debian-sources-2.6.38.3-bridgemac.patch
+++ /dev/null
@@ -1,15 +0,0 @@
-diff -urN linux/net/bridge/br_stp_if.c drobtmp/net/bridge/br_stp_if.c
---- linux/net/bridge/br_stp_if.c 2009-06-20 01:46:25.000000000 -0600
-+++ drobtmp/net/bridge/br_stp_if.c 2009-06-27 16:47:57.000000000 -0600
-@@ -163,10 +163,7 @@
- struct net_bridge_port *p;
-
- list_for_each_entry(p, &br->port_list, list) {
-- if (addr == br_mac_zero ||
-- memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
-- addr = p->dev->dev_addr;
--
-+ addr = p->dev->dev_addr;
- }
-
- if (compare_ether_addr(br->bridge_id.addr, addr))
diff --git a/sys-kernel/debian-sources-lts/metadata.xml b/sys-kernel/debian-sources-lts/metadata.xml
deleted file mode 100644
index bd7d6111..00000000
--- a/sys-kernel/debian-sources-lts/metadata.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<pkgmetadata>
-<herd>funtoo</herd>
-<maintainer>
- <email>funtoo-dev@googlegroups.com</email>
-</maintainer>
-</pkgmetadata>
diff --git a/sys-kernel/debian-sources/Manifest b/sys-kernel/debian-sources/Manifest
deleted file mode 100644
index 97775aec..00000000
--- a/sys-kernel/debian-sources/Manifest
+++ /dev/null
@@ -1,16 +0,0 @@
-DIST linux_3.10.11-1.debian.tar.xz 750708 SHA256 5597033846bd3f992712f20e261062e1ac2320897594578bfab731702495ee52 SHA512 14afb60757457e3070766cbe97200987a9b9dc9d7a5d32077886753599cdeaf6a35d8ae3a6f9a39371633c11e8cc20942cbf4be6ac5f40ea49241df9cc3060a7 WHIRLPOOL d571f4ee852af76b79b7db2349227522e86f59ba4562f43c00a5a1cfe5067eca9e857a441cc695095968ebf74cb612ef9da9db4ee3f2bd54a5c6a08a70da123b
-DIST linux_3.10.11.orig.tar.xz 73944292 SHA256 c6337250fb9eaa258eefc37ee9f66d3c4fcf8db1e3b29e3c557e33f5df6a05c7 SHA512 e214a14f9ca70bdece4abb6ff82ee9b5e66694b8415d43d74455e6c31dbe4f39583ae0c7e14fc569bfb777131e34b5e2e35f819314b500f72cae80b67f3e6451 WHIRLPOOL 2bca020fade4ef2ebac5b96de957fbe5e69463dfc33c87b9f96259843125a9e2b9d1a3d2483e5450680ce400b1d2bea094dd7ac8ccf3964e31714bb2cfbb06e2
-DIST linux_3.11.10-1.debian.tar.xz 2688056 SHA256 9669805bb50cef3f89854b81f74de371391db798d700c3ea461b63132bc3e586 SHA512 42092c21d73e8f8d82688ec0ae1029324ebdb5e7814de23393986f3d917d9134bf043ee0ab96bb5d517ae1fc63165b80179f1afd14eecdab1ce4fb8e86ad0d51 WHIRLPOOL 23ddf48f55cb3dcef82bcae6ca35cd4bf4f1edf17bc9e31fdfb6730bce49b77d716c138973ec427455f2f2094d8011d383165d3a737052bbde1d1f43f5682843
-DIST linux_3.11.10.orig.tar.xz 75892436 SHA256 23f3392aa9d97e514e892b91691dba67d2cef9a064d49c0e4f90a12b9e3a8331 SHA512 5cb32460ab1d331c267723c2693659c66c030aac218bcefdcefde54a8af4eaa24b795fac067b9bf7fd17409fcbb7783787ef5389054ce44d0c327017ee7cfb87 WHIRLPOOL 2fe53bdeaae503b3d40ea4bb7b9f18f9ade47f99d72b6d4cedc74dc6431d649b999a7ae388daf88b6de8d8816d60d9f9de8a81460779aadd16463e47c511c426
-DIST linux_3.12.3-1~exp1.debian.tar.xz 770364 SHA256 34fdb9d6d368665a3fe468058c794058624d14db545ceefc8bf092bd11191609 SHA512 52c1a5563ef89b90249b27692b2a6c84fa2e4fd711c3563376a830bbafba280a22fef237b5eaedc01ccd87625a3a40450cd355497df5f946e9564d657a400077 WHIRLPOOL 624f91fe66f25090ab2976a075f9f26edc692fede685a07bf4d01c76b5134c29862602940b6062b22cc27f61a76b0372aa6b5a535607395da05f635596ea3c37
-DIST linux_3.12.3.orig.tar.xz 77289676 SHA256 52991a7699ace36517e9bca4442db0b1ad736f169d24186deaf4b133cb17816d SHA512 760c8de39431b1b34e76d887bd8747807fdbff0cdf65fb28847625151be2abc632ee3a0b30caefce1f3723ea4756fa51dbffb93590f5a47865e4cc5e93139e8e WHIRLPOOL a3aadb0210b72749c7a4d23d47eb62fc371d173812eb043b638c43af26c81da9ee6d0afa6a76678f892cc5376cbf007b5794afafa9560b2fb85890763146a13d
-DIST linux_3.2.29-1.debian.tar.xz 955952 SHA256 b421f738632fd0b85c6686313daea7e8cebd4d218af4f92a4e6327449d51f4d6
-DIST linux_3.2.29.orig.tar.xz 65725120 SHA256 e9fdd2a7f774188974f5e74a68a112e563763e0c83db7a8411d5d3bb4bee1213
-DIST linux_3.2.35-2.debian.tar.xz 2483540 SHA256 8ae153d652cb0a870128d202fe6cd93d89f2c70996217355ca5681b62cce37fb SHA512 b2e6e0fcbac4e2b4a0cfc958535c13f22a20387b557995e7e036b79f6d29061fbe79eddfc5de1e3abe200b4c765637b19773ab8e5c61f3842c449a3dc3a49f85 WHIRLPOOL 8b30cadfcdaad17fc73d9fb567c3f68abac0f9b4ae778ed500bd601edda654c3ba6dd498f6b7df77ab4ae55f5c2b8475134b39cef7ee818872dd19b915f6dd0d
-DIST linux_3.2.35.orig.tar.xz 65831540 SHA256 ea4c76c3820f9d7a07c7beb9f631a07d04613908c5f670afa200d677fd5f8538 SHA512 f2f931dc1169af7b19d4b9e88935297ee72b173b4fc946a8932f8599bb43164c23f7de4da2468319fa5991de7347b93c1b4a5a727c5d0b98db68e535cc1cedbe WHIRLPOOL 9c4e901c93e89bdbc4da45391a830f90839164cd3a565a7e836d121a5fe879b1611e7993a7061037caa5639c00fd0de98963934615cefb897895171668aa0641
-DIST linux_3.2.39-1.debian.tar.xz 3188844 SHA256 5332b4729956b341230cbbaff06fda0c51347e68a054c791e35a10898143ff13 SHA512 6c4aaba734da7193b33e5c2e49d4a771296f870e40570cbad79e253c6f85f551d29cb556f05851e18f8e474af23165de4bc921ef56037872597283d703e467e3 WHIRLPOOL 330d65b6bccf0de85bc9bc38c98a94bb5c41d9266cbc5abc48c23d9eb5e077dac25a480fc51c1e41187a7e5382d9194a167bcb8a7accc5f232d7ba5b1b16daf7
-DIST linux_3.2.39.orig.tar.xz 65857136 SHA256 663eb090fc2d7d5a3d0dc613a662baf44c5e0057a9e99b404299ee25546e7a91 SHA512 fae785b28689f1fac6741806136939a1d00a23fda07e7106259db14755a89bb35979c5f9792d48a969db547b9a0058bf824a9d1012059fbe57b128d5d2179fcf WHIRLPOOL 22fa44fc16b537d2140e7ef7bdff60b9d828129d8c3370b1260b576e1b40eb8052d41867a0bc229e8116a7fdb09c54bdcdbf49d07300cad9f793d4ede3377a33
-DIST linux_3.2.41-2+deb7u2.debian.tar.xz 3190452 SHA256 29400c7b48e78c18dcc05c19bbbbf42d229d6eaed6efd4baeb1eb4f168f17f30 SHA512 dc3b61a0bd843f53362532cef9aba4f50ee65141f77569d30838baf9cbf4ab154acb5dea018355c759dc0ec88db41c4cc03ae0831b28e7d8e0399f71f997a5bd WHIRLPOOL 22acf212881f4df1338f7b1bf4f5e3f4411ad19370b21cd6ea172b0ef25e84e632ad954992bb35da568ee384b4d3a9dfa3c56afdb7e4e2c8926a002d023cbcc6
-DIST linux_3.2.41.orig.tar.xz 65857856 SHA256 a74577ed87d53af9d880c1a11c0be50d44edbcaeb8b0db54f3d1dafbd3dcc386 SHA512 2c5c78d6ad5080e587ed03dcab328b7c7ae3b9b0fd2776196b4ba1519e445a3996cb70a0293ecedacc5713b61ca76935d19af37fc3d5a956cd21bc0d08e877e4 WHIRLPOOL 5a9b2e67d87e8b662a093de1148953b2818047112a9d9588286aa508393538dbc018314c2302069f06a8b3cf2046abd93b67db6d3cf7de339ca77ffbbb330abe
-DIST linux_3.2.51-1.debian.tar.xz 3260368 SHA256 6a2d6f80b886fce43df8092e3ba0f423190872a763c75b058f93133d9cbad8a0 SHA512 6966728af759fd86a4613ec1b8c33771243ab2d83aa66848137d91971820012f83a3b7084c2eaaee85ed790bb8b384794d283fe00d4ae54efb65cb0204f2386f WHIRLPOOL 4731a63f02d4895edc51c4c693772ffd3361ec5236d3d3a1b3c8453e3708ace33e0ca0a3bd424705f264458c0c1ff6f0ed4ddf57d12b6d75c1d9ca3fc0a32d8c
-DIST linux_3.2.51.orig.tar.xz 65876468 SHA256 a6f1aa8a0d5addc805e35d94457280975c5162990fb2f2a82de061d55932a3a3 SHA512 1141957380ecdf21358fee45f34e161be1b5822cdd625cab82413e588d0adaedb58bcbbec914b6ee2624a63cb470cc88d3f0cb6ee78f21178ad6c6fce49a0ada WHIRLPOOL e376767227757235954e238a94261482b4daa52823166ebf32c43504ad24d62ce9430b50418ff1f70bac1c0c247786d5f6f8c79f0b283c3a81369a918a78d0f7
diff --git a/sys-kernel/debian-sources/debian-sources-3.10.11.ebuild b/sys-kernel/debian-sources/debian-sources-3.10.11.ebuild
deleted file mode 100644
index 02039505..00000000
--- a/sys-kernel/debian-sources/debian-sources-3.10.11.ebuild
+++ /dev/null
@@ -1,145 +0,0 @@
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=3
-
-inherit eutils mount-boot
-
-SLOT=$PVR
-CKV=3.10.11
-KV_FULL=${PN}-${PVR}
-EXTRAVERSION=-1
-KERNEL_ARCHIVE="linux_${PV}.orig.tar.xz"
-PATCH_ARCHIVE="linux_${PV}${EXTRAVERSION}.debian.tar.xz"
-RESTRICT="binchecks strip mirror"
-# based on : http://packages.ubuntu.com/maverick/linux-image-2.6.35-22-server
-LICENSE="GPL-2"
-KEYWORDS="*"
-IUSE="binary rt"
-DEPEND="binary? ( >=sys-kernel/genkernel-3.4.40.7 )"
-RDEPEND="binary? ( || ( >=sys-fs/udev-160 >=virtual/udev-171 ) )"
-DESCRIPTION="Debian Sources (and optional binary kernel)"
-HOMEPAGE="http://www.debian.org"
-SRC_URI="http://ftp.osuosl.org/pub/funtoo/distfiles/${KERNEL_ARCHIVE} http://ftp.osuosl.org/pub/funtoo/distfiles/${PATCH_ARCHIVE}"
-S="$WORKDIR/linux-${CKV}"
-
-get_patch_list() {
- [[ -z "${1}" ]] && die "No patch series file specified"
- local patch_series="${1}"
- while read line ; do
- if [[ "${line:0:1}" != "#" ]] ; then
- echo "${line}"
- fi
- done < "${patch_series}"
-}
-
-pkg_setup() {
- export REAL_ARCH="$ARCH"
- unset ARCH; unset LDFLAGS #will interfere with Makefile if set
-}
-
-src_prepare() {
-
- cd ${S}
- for debpatch in $( get_patch_list "${WORKDIR}/debian/patches/series" ); do
- epatch -p1 "${WORKDIR}/debian/patches/${debpatch}"
- done
-
- if use rt ; then
- for rtpatch in $( get_patch_list "${WORKDIR}/debian/patches/series-rt" ) ; do
- epatch -p1 "${WORKDIR}/debian/patches/${rtpatch}"
- done
- fi
-
- # end of debian-specific stuff...
-
- sed -i -e "s:^\(EXTRAVERSION =\).*:\1 ${EXTRAVERSION}:" Makefile || die
- sed -i -e 's:#export\tINSTALL_PATH:export\tINSTALL_PATH:' Makefile || die
- rm -f .config >/dev/null
- cp -a "${WORKDIR}"/debian "${T}"
- make -s mrproper || die "make mrproper failed"
- #make -s include/linux/version.h || die "make include/linux/version.h failed"
- cd ${S}
-
- cp -aR "${WORKDIR}"/debian "${S}"/debian
- # xfs fix for 3.10.11, see FL-823:
- epatch ${FILESDIR}/debian-sources-3.10.11-xfs-libcrc32c-fix.patch
-
- local opts
- use rt && opts="rt" || opts="standard"
- local myarch="amd64"
- [ "$REAL_ARCH" = "x86" ] && myarch="i386" && opts="$opts 686-pae"
- cp ${FILESDIR}/config-extract . || die
- chmod +x config-extract || die
- ./config-extract ${myarch} ${opts} || die
- cp .config ${T}/config || die
- make -s mrproper || die "make mrproper failed"
- #make -s include/linux/version.h || die "make include/linux/version.h failed"
-}
-
-src_compile() {
- ! use binary && return
- install -d ${WORKDIR}/out/{lib,boot}
- install -d ${T}/{cache,twork}
- install -d $WORKDIR/build $WORKDIR/out/lib/firmware
- genkernel \
- --no-save-config \
- --kernel-config="$T/config" \
- --kernname="${PN}" \
- --build-src="$S" \
- --build-dst=${WORKDIR}/build \
- --makeopts="${MAKEOPTS}" \
- --firmware-dst=${WORKDIR}/out/lib/firmware \
- --cachedir="${T}/cache" \
- --tempdir="${T}/twork" \
- --logfile="${WORKDIR}/genkernel.log" \
- --bootdir="${WORKDIR}/out/boot" \
- --lvm \
- --luks \
- --mdadm \
- --iscsi \
- --module-prefix="${WORKDIR}/out" \
- all || die "genkernel failed"
-}
-
-src_install() {
- # copy sources into place:
- dodir /usr/src
- cp -a ${S} ${D}/usr/src/linux-${P} || die
- cd ${D}/usr/src/linux-${P}
- # prepare for real-world use and 3rd-party module building:
- make mrproper || die
- cp ${T}/config .config || die
- cp -a ${T}/debian debian || die
- yes "" | make oldconfig || die
- # if we didn't use genkernel, we're done. The kernel source tree is left in
- # an unconfigured state - you can't compile 3rd-party modules against it yet.
- use binary || return
- make prepare || die
- make scripts || die
- # OK, now the source tree is configured to allow 3rd-party modules to be
- # built against it, since we want that to work since we have a binary kernel
- # built.
- cp -a ${WORKDIR}/out/* ${D}/ || die "couldn't copy output files into place"
- # module symlink fixup:
- rm -f ${D}/lib/modules/*/source || die
- rm -f ${D}/lib/modules/*/build || die
- cd ${D}/lib/modules
- # module strip:
- find -iname *.ko -exec strip --strip-debug {} \;
- # back to the symlink fixup:
- local moddir="$(ls -d [23]*)"
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/source || die
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/build || die
-
- # Fixes FL-14
- cp "${WORKDIR}/build/System.map" "${D}/usr/src/linux-${P}/" || die
- cp "${WORKDIR}/build/Module.symvers" "${D}/usr/src/linux-${P}/" || die
-
-}
-
-pkg_postinst() {
- if [ ! -e ${ROOT}usr/src/linux ]
- then
- ln -s linux-${P} ${ROOT}usr/src/linux
- fi
-}
diff --git a/sys-kernel/debian-sources/debian-sources-3.12.3.ebuild b/sys-kernel/debian-sources/debian-sources-3.12.3.ebuild
deleted file mode 100644
index 86dae42e..00000000
--- a/sys-kernel/debian-sources/debian-sources-3.12.3.ebuild
+++ /dev/null
@@ -1,145 +0,0 @@
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=3
-
-inherit eutils mount-boot
-
-SLOT=$PVR
-CKV=3.12.3
-KV_FULL=${PN}-${PVR}
-EXTRAVERSION=-1~exp1
-KERNEL_ARCHIVE="linux_${PV}.orig.tar.xz"
-PATCH_ARCHIVE="linux_${PV}${EXTRAVERSION}.debian.tar.xz"
-RESTRICT="binchecks strip mirror"
-# based on : http://packages.ubuntu.com/maverick/linux-image-2.6.35-22-server
-LICENSE="GPL-2"
-KEYWORDS="*"
-IUSE="binary rt"
-DEPEND="binary? ( >=sys-kernel/genkernel-3.4.40.7 )"
-RDEPEND="binary? ( || ( >=sys-fs/udev-160 >=virtual/udev-171 ) )"
-DESCRIPTION="Debian Sources (and optional binary kernel)"
-HOMEPAGE="http://www.debian.org"
-SRC_URI="http://ftp.osuosl.org/pub/funtoo/distfiles/${KERNEL_ARCHIVE} http://ftp.osuosl.org/pub/funtoo/distfiles/${PATCH_ARCHIVE}"
-S="$WORKDIR/linux-${CKV}"
-
-get_patch_list() {
- [[ -z "${1}" ]] && die "No patch series file specified"
- local patch_series="${1}"
- while read line ; do
- if [[ "${line:0:1}" != "#" ]] ; then
- echo "${line}"
- fi
- done < "${patch_series}"
-}
-
-pkg_setup() {
- export REAL_ARCH="$ARCH"
- unset ARCH; unset LDFLAGS #will interfere with Makefile if set
-}
-
-src_prepare() {
-
- cd ${S}
- for debpatch in $( get_patch_list "${WORKDIR}/debian/patches/series" ); do
- epatch -p1 "${WORKDIR}/debian/patches/${debpatch}"
- done
-
- if use rt ; then
- for rtpatch in $( get_patch_list "${WORKDIR}/debian/patches/series-rt" ) ; do
- epatch -p1 "${WORKDIR}/debian/patches/${rtpatch}"
- done
- fi
-
- # end of debian-specific stuff...
-
- sed -i -e "s:^\(EXTRAVERSION =\).*:\1 ${EXTRAVERSION}:" Makefile || die
- sed -i -e 's:#export\tINSTALL_PATH:export\tINSTALL_PATH:' Makefile || die
- rm -f .config >/dev/null
- cp -a "${WORKDIR}"/debian "${T}"
- make -s mrproper || die "make mrproper failed"
- #make -s include/linux/version.h || die "make include/linux/version.h failed"
- cd ${S}
- cp -aR "${WORKDIR}"/debian "${S}"/debian
-
- ## XFS LIBCRC kernel config fixes, FL-823
- epatch ${FILESDIR}/debian-sources-3.12.3-xfs-libcrc32c-fix.patch
-
- local opts
- use rt && opts="rt" || opts="standard"
- local myarch="amd64"
- [ "$REAL_ARCH" = "x86" ] && myarch="i386" && opts="$opts 686-pae"
- cp ${FILESDIR}/config-extract . || die
- chmod +x config-extract || die
- ./config-extract ${myarch} ${opts} || die
- cp .config ${T}/config || die
- make -s mrproper || die "make mrproper failed"
- #make -s include/linux/version.h || die "make include/linux/version.h failed"
-}
-
-src_compile() {
- ! use binary && return
- install -d ${WORKDIR}/out/{lib,boot}
- install -d ${T}/{cache,twork}
- install -d $WORKDIR/build $WORKDIR/out/lib/firmware
- genkernel \
- --no-save-config \
- --kernel-config="$T/config" \
- --kernname="${PN}" \
- --build-src="$S" \
- --build-dst=${WORKDIR}/build \
- --makeopts="${MAKEOPTS}" \
- --firmware-dst=${WORKDIR}/out/lib/firmware \
- --cachedir="${T}/cache" \
- --tempdir="${T}/twork" \
- --logfile="${WORKDIR}/genkernel.log" \
- --bootdir="${WORKDIR}/out/boot" \
- --lvm \
- --luks \
- --mdadm \
- --iscsi \
- --module-prefix="${WORKDIR}/out" \
- all || die "genkernel failed"
-}
-
-src_install() {
- # copy sources into place:
- dodir /usr/src
- cp -a ${S} ${D}/usr/src/linux-${P} || die
- cd ${D}/usr/src/linux-${P}
- # prepare for real-world use and 3rd-party module building:
- make mrproper || die
- cp ${T}/config .config || die
- cp -a ${T}/debian debian || die
- yes "" | make oldconfig || die
- # if we didn't use genkernel, we're done. The kernel source tree is left in
- # an unconfigured state - you can't compile 3rd-party modules against it yet.
- use binary || return
- make prepare || die
- make scripts || die
- # OK, now the source tree is configured to allow 3rd-party modules to be
- # built against it, since we want that to work since we have a binary kernel
- # built.
- cp -a ${WORKDIR}/out/* ${D}/ || die "couldn't copy output files into place"
- # module symlink fixup:
- rm -f ${D}/lib/modules/*/source || die
- rm -f ${D}/lib/modules/*/build || die
- cd ${D}/lib/modules
- # module strip:
- find -iname *.ko -exec strip --strip-debug {} \;
- # back to the symlink fixup:
- local moddir="$(ls -d [23]*)"
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/source || die
- ln -s /usr/src/linux-${P} ${D}/lib/modules/${moddir}/build || die
-
- # Fixes FL-14
- cp "${WORKDIR}/build/System.map" "${D}/usr/src/linux-${P}/" || die
- cp "${WORKDIR}/build/Module.symvers" "${D}/usr/src/linux-${P}/" || die
-
-}
-
-pkg_postinst() {
- if [ ! -e ${ROOT}usr/src/linux ]
- then
- ln -s linux-${P} ${ROOT}usr/src/linux
- fi
-}
diff --git a/sys-kernel/debian-sources/files/config-extract b/sys-kernel/debian-sources/files/config-extract
deleted file mode 100755
index 4860a645..00000000
--- a/sys-kernel/debian-sources/files/config-extract
+++ /dev/null
@@ -1,219 +0,0 @@
-#!/usr/bin/python2
-
-import os,sys,re
-import getopt
-
-re_head = re.compile('^binary-arch_(.*)_real::')
-re_flav = re.compile('binary-arch-flavour')
-re_item = re.compile("[A-Z_]*='[^']*'")
-
-try:
- f=open("debian/rules.gen","r")
-except:
- print "Unable to open debian/rules.gen; can't continue."
- sys.exit(1)
-lines=f.readlines()
-f.close()
-
-line=0
-
-configlist = []
-configdict = {}
-
-# scan Debian rules.gen file and gather all variable data into a more useable format:
-
-while line < len(lines):
- head_match = re_head.match(lines[line])
- if not head_match:
- line += 1
- continue
- config_name = head_match.group(1)
- line += 1
- if not re_flav.findall(lines[line]):
- continue
- lsplit = re_item.findall(lines[line])
- groovydict = {}
- for item in lsplit:
- kv = item.split("=",1)
- if len(kv) < 2:
- continue
- groovydict[kv[0]] = kv[1][1:-1]
- configlist.append(config_name)
- configdict[config_name] = groovydict
- line += 1
-
-# We will organize the arch, featureset and flavors into cascading lists so
-# that we can present a nice clean chart of what's available to the user:
-
-archdict = {}
-
-for config in configlist:
- cs = config.split("_")
- if not cs[0] in archdict:
- archdict[cs[0]] = { }
- if cs[1] == "none":
- cs[1] = None
- if cs[1] not in archdict[cs[0]]:
- archdict[cs[0]][cs[1]] = []
- archdict[cs[0]][cs[1]].append(cs[2])
-
-arches = archdict.keys()
-arches.sort()
-
-features = [ None ]
-for arch in arches:
- for flav in archdict[arch]:
- if flav not in features:
- features.append(flav)
-
-PROG="config-extract"
-def usage():
- print """This work is free software.
-
-Copyright 2011 Funtoo Technologies. You can redistribute and/or modify it under
-the terms of the GNU General Public License version 3 as published by the Free
-Software Foundation. Alternatively you may (at your option) use any other
-license that has been publicly approved for use with this program by Funtoo
-Technologies (or its successors, if any.)
-
-usage: %s [options] arch [featureset] [subarch]
-
- -h --help print this usage and exit
- -l --list list all available kernel configurations
- -o --outfile specify kernel config outfile --
- defaults to .config in current directory
- [featureset] defaults to "standard" if not specified
- [subarch] defaults to the only one available; otherwise required
-
-This program was written by Daniel Robbins for Funtoo Linux, for the purpose of
-easily and conveniently extracting Debian kernel configurations. To see a nice
-list of all available kernel configurations, use the --list option.
-
-Debian's kernel configs are specified internally in arch_featureset_flavor
-format, such as: "amd64_openvz_amd64". The featureset typically describes an
-optional kernel configuration such as "xen" or "openvz", while the flavor in
-Debian terminology typically refers to the sub-architecture of the CPU.
-
-When using this command, you must specify an arch. A featureset of "standard" is
-assumed unless you specify one, and by default this program will pick the only
-available subarch if there is only one to choose from. If not, you will need to
-pick one (and the program will remind you to do this.)
-
-The kernel configuration will be written to ".config" in the current directory,
-or the location you specified using the -o/--outfile option.
-""" % PROG
- sys.exit(2)
-
-try:
- opts, args = getopt.getopt(sys.argv[1:], "o:hl", ["help", "list","outfile="])
-except getopt.GetoptError, err:
- print str(err)
- usage()
-
-mode="run"
-outfile=None
-for o,a in opts:
- if o in ("-h", "--help"):
- usage()
- elif o in ("-l", "--list"):
- mode="list"
- elif o in ("-o", "--outfile"):
- outfile = a
- else:
- assert False, "Unhandled option"
-if mode == "run":
- if len(args) < 1 or len(args) > 3:
- if len(args) == 0:
- print "Please specify an arch - one of: "+", ".join(arches)
- sys.exit(2)
- else:
- print "Too many arguments."
- usage()
- arch = args[0]
- if outfile == None:
- outfile = os.path.join(os.getcwd(),".config")
- featureset = None
- subarch = None
- if len(args) == 3:
- featureset = args[1]
- subarch = args[2]
- elif len(args) == 2:
- featureset = args[1]
- if featureset == "standard":
- featureset = None
-
-# print out optimized list of available kernel configurations:
-
-if mode=="list":
- print
- for flav in features:
- label = flav
- if label == None:
- label = "standard"
- print "====== %s featureset ======" % label
- print
- for arch in arches:
- if flav in archdict[arch]:
- if len(archdict[arch][flav]) == 1:
- print arch.rjust(12)
- else:
- flavlist = archdict[arch][flav]
- flavlist.sort()
- variants = ", ".join(flavlist)
- print arch.rjust(12) + ":", variants
- print
- sys.exit(0)
-
-# featureset defaults to None.
-
-if featureset not in archdict[arch]:
- print "Error: There is no '%s' featureset kernel config for arch '%s'. Exiting." % ( featureset, arch )
- print archdict[arch]
- sys.exit(2)
-
-# If a subarch is not specified (None), then we will auto-pick the subarch if only one is available.
-# Debian often has an "amd64" subarch for the "amd64" arch, rather than "none" as I might expect:
-
-if subarch == None:
- if len(archdict[arch][featureset]) == 1:
- subarch = archdict[arch][featureset][0]
- else:
- print "Error: there is more than one 'sub-architecture' for this arch."
- print "Please specify [arch] [featureset] [subarch], with one of these subarches:"
- print ", ".join(archdict[arch][featureset])
- sys.exit(2)
-else:
- if subarch not in archdict[arch][featureset]:
- print "Error: specified sub-architecture '%s' is not available for this arch. Exiting." % subarch
- sys.exit(2)
-
-# We've done all our arg processing, now let's construct the master_key that we will use to look up the
-# proper settings to pass to Debian's debian/bin/kconfig.py command:
-
-master_key=arch
-if featureset == None:
- master_key += "_none"
-else:
- master_key += "_%s" % featureset
-if subarch == None:
- master_key += "_none"
-else:
- master_key += "_%s" % subarch
-if master_key not in configdict:
- print "Master key lookup failed; can't continue. Please report this bug."
- sys.exit(1)
-if "KCONFIG" not in configdict[master_key]:
- print "Unable to find KCONFIG option; can't continue. Please report this bug."
- sys.exit(1)
-cmd = "python2 debian/bin/kconfig.py '%s' %s" % ( outfile, configdict[master_key]["KCONFIG"] )
-if "KCONFIG_OPTIONS" in configdict[master_key]:
- cmd += " %s" % configdict[master_key]["KCONFIG_OPTIONS"]
-os.environ["PYTHONPATH"] = "debian/lib/python"
-retval = os.system(cmd)
-if retval == 0:
- print "Wrote %s kernel configuration to %s." % ( master_key, outfile )
- sys.exit(0)
-else:
- print "There was an error extracting the Debian kernel config."
- sys.exit(1)
-
diff --git a/sys-kernel/debian-sources/files/debian-sources-3.10.11-xfs-libcrc32c-fix.patch b/sys-kernel/debian-sources/files/debian-sources-3.10.11-xfs-libcrc32c-fix.patch
deleted file mode 100644
index a20fecdc..00000000
--- a/sys-kernel/debian-sources/files/debian-sources-3.10.11-xfs-libcrc32c-fix.patch
+++ /dev/null
@@ -1,21 +0,0 @@
-diff -urN linux-debian-sources-3.10.11/debian/config/config linux-debian-sources-3.10.11-fixed/debian/config/config
---- linux-debian-sources-3.10.11/debian/config/config 2013-08-17 13:57:25.000000000 -0600
-+++ linux-debian-sources-3.10.11-fixed/debian/config/config 2013-12-10 15:58:46.512296124 -0700
-@@ -4183,7 +4183,7 @@
- ##
- ## file: fs/xfs/Kconfig
- ##
--CONFIG_XFS_FS=m
-+CONFIG_XFS_FS=y
- CONFIG_XFS_QUOTA=y
- CONFIG_XFS_POSIX_ACL=y
- CONFIG_XFS_RT=y
-@@ -4360,7 +4360,7 @@
- CONFIG_CRC_ITU_T=m
- CONFIG_CRC32=y
- CONFIG_CRC7=m
--CONFIG_LIBCRC32C=m
-+CONFIG_LIBCRC32C=y
-
- ##
- ## file: lib/Kconfig.debug
diff --git a/sys-kernel/debian-sources/files/debian-sources-3.12.3-xfs-libcrc32c-fix.patch b/sys-kernel/debian-sources/files/debian-sources-3.12.3-xfs-libcrc32c-fix.patch
deleted file mode 100644
index ca0ee89c..00000000
--- a/sys-kernel/debian-sources/files/debian-sources-3.12.3-xfs-libcrc32c-fix.patch
+++ /dev/null
@@ -1,21 +0,0 @@
-diff -Nuar -Nuar debian/config/config debian-fixed/config/config
---- debian/config/config 2013-12-05 01:48:42.000000000 +0000
-+++ debian-fixed/config/config 2013-12-14 07:39:56.017237225 +0000
-@@ -4425,7 +4425,7 @@
- ##
- ## file: fs/xfs/Kconfig
- ##
--CONFIG_XFS_FS=m
-+CONFIG_XFS_FS=y
- CONFIG_XFS_QUOTA=y
- CONFIG_XFS_POSIX_ACL=y
- CONFIG_XFS_RT=y
-@@ -4614,7 +4614,7 @@
- CONFIG_CRC32=y
- # CONFIG_CRC32_SELFTEST is not set
- CONFIG_CRC7=m
--CONFIG_LIBCRC32C=m
-+CONFIG_LIBCRC32C=y
- # CONFIG_DDR is not set
-
- ##
diff --git a/sys-kernel/debian-sources/metadata.xml b/sys-kernel/debian-sources/metadata.xml
deleted file mode 100644
index 403aaa88..00000000
--- a/sys-kernel/debian-sources/metadata.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<pkgmetadata>
- <herd>funtoo</herd>
- <maintainer>
- <email>funtoo-dev@googlegroups.com</email>
- </maintainer>
- <use>
- <flag name='binary'>Builds and installs kernel automatically</flag>
- <flag name='rt'>Applies the CONFIG_PREEMPT_RT patch series</flag>
- </use>
-</pkgmetadata>
diff --git a/sys-kernel/kogaion-sources/files/desktop/0001-block-cgroups-kconfig-build-bits-for-BFQ-v7-3.10.patch b/sys-kernel/kogaion-sources/files/desktop/0001-block-cgroups-kconfig-build-bits-for-BFQ-v7-3.10.patch
deleted file mode 100644
index f92978cf..00000000
--- a/sys-kernel/kogaion-sources/files/desktop/0001-block-cgroups-kconfig-build-bits-for-BFQ-v7-3.10.patch
+++ /dev/null
@@ -1,103 +0,0 @@
-From 3ded69bee018e94b1cf5e13af9ff557f0f61ab30 Mon Sep 17 00:00:00 2001
-From: Arianna Avanzini <avanzini.arianna@gmail.com>
-Date: Mon, 27 Jan 2014 23:50:08 +0100
-Subject: [PATCH 1/3] block: cgroups, kconfig, build bits for BFQ-v7-3.10
-
-Update Kconfig.iosched and do the related Makefile changes to include
-kernel configuration options for BFQ. Also add the bfqio controller
-to the cgroups subsystem.
-
-Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
-Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
----
- block/Kconfig.iosched | 32 ++++++++++++++++++++++++++++++++
- block/Makefile | 1 +
- include/linux/cgroup_subsys.h | 6 ++++++
- 3 files changed, 39 insertions(+)
-
-diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
-index 421bef9..8f552ba 100644
---- a/block/Kconfig.iosched
-+++ b/block/Kconfig.iosched
-@@ -39,6 +39,27 @@ config CFQ_GROUP_IOSCHED
- ---help---
- Enable group IO scheduling in CFQ.
-
-+config IOSCHED_BFQ
-+ tristate "BFQ I/O scheduler"
-+ default n
-+ ---help---
-+ The BFQ I/O scheduler tries to distribute bandwidth among
-+ all processes according to their weights.
-+ It aims at distributing the bandwidth as desired, independently of
-+ the disk parameters and with any workload. It also tries to
-+ guarantee low latency to interactive and soft real-time
-+ applications. If compiled built-in (saying Y here), BFQ can
-+ be configured to support hierarchical scheduling.
-+
-+config CGROUP_BFQIO
-+ bool "BFQ hierarchical scheduling support"
-+ depends on CGROUPS && IOSCHED_BFQ=y
-+ default n
-+ ---help---
-+ Enable hierarchical scheduling in BFQ, using the cgroups
-+ filesystem interface. The name of the subsystem will be
-+ bfqio.
-+
- choice
- prompt "Default I/O scheduler"
- default DEFAULT_CFQ
-@@ -52,6 +73,16 @@ choice
- config DEFAULT_CFQ
- bool "CFQ" if IOSCHED_CFQ=y
-
-+ config DEFAULT_BFQ
-+ bool "BFQ" if IOSCHED_BFQ=y
-+ help
-+ Selects BFQ as the default I/O scheduler which will be
-+ used by default for all block devices.
-+ The BFQ I/O scheduler aims at distributing the bandwidth
-+ as desired, independently of the disk parameters and with
-+ any workload. It also tries to guarantee low latency to
-+ interactive and soft real-time applications.
-+
- config DEFAULT_NOOP
- bool "No-op"
-
-@@ -61,6 +92,7 @@ config DEFAULT_IOSCHED
- string
- default "deadline" if DEFAULT_DEADLINE
- default "cfq" if DEFAULT_CFQ
-+ default "bfq" if DEFAULT_BFQ
- default "noop" if DEFAULT_NOOP
-
- endmenu
-diff --git a/block/Makefile b/block/Makefile
-index 39b76ba..c0d20fa 100644
---- a/block/Makefile
-+++ b/block/Makefile
-@@ -15,6 +15,7 @@ obj-$(CONFIG_BLK_DEV_THROTTLING) += blk-throttle.o
- obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o
- obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o
- obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
-+obj-$(CONFIG_IOSCHED_BFQ) += bfq-iosched.o
-
- obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o
- obj-$(CONFIG_BLK_DEV_INTEGRITY) += blk-integrity.o
-diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
-index 6e7ec64..e5e6b0d 100644
---- a/include/linux/cgroup_subsys.h
-+++ b/include/linux/cgroup_subsys.h
-@@ -84,3 +84,9 @@ SUBSYS(bcache)
- #endif
-
- /* */
-+
-+#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_BFQIO)
-+SUBSYS(bfqio)
-+#endif
-+
-+/* */
---
-1.8.5.2
-
diff --git a/sys-kernel/kogaion-sources/files/desktop/0002-block-introduce-the-BFQ-v7-I-O-sched-for-3.10.patch b/sys-kernel/kogaion-sources/files/desktop/0002-block-introduce-the-BFQ-v7-I-O-sched-for-3.10.patch
deleted file mode 100644
index 0a2c5079..00000000
--- a/sys-kernel/kogaion-sources/files/desktop/0002-block-introduce-the-BFQ-v7-I-O-sched-for-3.10.patch
+++ /dev/null
@@ -1,5969 +0,0 @@
-From d40506359ff7f890adac4bd75541de73044a121e Mon Sep 17 00:00:00 2001
-From: Paolo Valente <paolo.valente@unimore.it>
-Date: Thu, 9 May 2013 19:10:02 +0200
-Subject: [PATCH 2/3] block: introduce the BFQ-v7 I/O sched for 3.10
-
-Add the BFQ-v7 I/O scheduler to 3.10.
-The general structure is borrowed from CFQ, as much of the code for
-handling I/O contexts Over time, several useful features have been
-ported from CFQ as well (details in the changelog in README.BFQ). A
-(bfq_)queue is associated to each task doing I/O on a device, and each
-time a scheduling decision has to be made a queue is selected and served
-until it expires.
-
- - Slices are given in the service domain: tasks are assigned
- budgets, measured in number of sectors. Once got the disk, a task
- must however consume its assigned budget within a configurable
- maximum time (by default, the maximum possible value of the
- budgets is automatically computed to comply with this timeout).
- This allows the desired latency vs "throughput boosting" tradeoff
- to be set.
-
- - Budgets are scheduled according to a variant of WF2Q+, implemented
- using an augmented rb-tree to take eligibility into account while
- preserving an O(log N) overall complexity.
-
- - A low-latency tunable is provided; if enabled, both interactive
- and soft real-time applications are guaranteed a very low latency.
-
- - Latency guarantees are preserved also in the presence of NCQ.
-
- - Also with flash-based devices, a high throughput is achieved
- while still preserving latency guarantees.
-
- - BFQ features Early Queue Merge (EQM), a sort of fusion of the
- cooperating-queue-merging and the preemption mechanisms present
- in CFQ. EQM is in fact a unified mechanism that tries to get a
- sequential read pattern, and hence a high throughput, with any
- set of processes performing interleaved I/O over a contiguous
- sequence of sectors.
-
- - BFQ supports full hierarchical scheduling, exporting a cgroups
- interface. Since each node has a full scheduler, each group can
- be assigned its own weight.
-
- - If the cgroups interface is not used, only I/O priorities can be
- assigned to processes, with ioprio values mapped to weights
- with the relation weight = IOPRIO_BE_NR - ioprio.
-
- - ioprio classes are served in strict priority order, i.e., lower
- priority queues are not served as long as there are higher
- priority queues. Among queues in the same class the bandwidth is
- distributed in proportion to the weight of each queue. A very
- thin extra bandwidth is however guaranteed to the Idle class, to
- prevent it from starving.
-
-Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
-Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
----
- block/bfq-cgroup.c | 885 ++++++++++++++
- block/bfq-ioc.c | 36 +
- block/bfq-iosched.c | 3256 +++++++++++++++++++++++++++++++++++++++++++++++++++
- block/bfq-sched.c | 1077 +++++++++++++++++
- block/bfq.h | 612 ++++++++++
- 5 files changed, 5866 insertions(+)
- create mode 100644 block/bfq-cgroup.c
- create mode 100644 block/bfq-ioc.c
- create mode 100644 block/bfq-iosched.c
- create mode 100644 block/bfq-sched.c
- create mode 100644 block/bfq.h
-
-diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
-new file mode 100644
-index 0000000..5a117ad
---- /dev/null
-+++ b/block/bfq-cgroup.c
-@@ -0,0 +1,885 @@
-+/*
-+ * BFQ: CGROUPS support.
-+ *
-+ * Based on ideas and code from CFQ:
-+ * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
-+ *
-+ * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
-+ * Paolo Valente <paolo.valente@unimore.it>
-+ *
-+ * Copyright (C) 2010 Paolo Valente <paolo.valente@unimore.it>
-+ *
-+ * Licensed under the GPL-2 as detailed in the accompanying COPYING.BFQ file.
-+ */
-+
-+#ifdef CONFIG_CGROUP_BFQIO
-+
-+static DEFINE_MUTEX(bfqio_mutex);
-+
-+static bool bfqio_is_removed(struct cgroup *cgroup)
-+{
-+ return test_bit(CGRP_REMOVED, &cgroup->flags);
-+}
-+
-+static struct bfqio_cgroup bfqio_root_cgroup = {
-+ .weight = BFQ_DEFAULT_GRP_WEIGHT,
-+ .ioprio = BFQ_DEFAULT_GRP_IOPRIO,
-+ .ioprio_class = BFQ_DEFAULT_GRP_CLASS,
-+};
-+
-+static inline void bfq_init_entity(struct bfq_entity *entity,
-+ struct bfq_group *bfqg)
-+{
-+ entity->weight = entity->new_weight;
-+ entity->orig_weight = entity->new_weight;
-+ entity->ioprio = entity->new_ioprio;
-+ entity->ioprio_class = entity->new_ioprio_class;
-+ entity->parent = bfqg->my_entity;
-+ entity->sched_data = &bfqg->sched_data;
-+}
-+
-+static struct bfqio_cgroup *cgroup_to_bfqio(struct cgroup *cgroup)
-+{
-+ return container_of(cgroup_subsys_state(cgroup, bfqio_subsys_id),
-+ struct bfqio_cgroup, css);
-+}
-+
-+/*
-+ * Search the bfq_group for bfqd into the hash table (by now only a list)
-+ * of bgrp. Must be called under rcu_read_lock().
-+ */
-+static struct bfq_group *bfqio_lookup_group(struct bfqio_cgroup *bgrp,
-+ struct bfq_data *bfqd)
-+{
-+ struct bfq_group *bfqg;
-+ void *key;
-+
-+ hlist_for_each_entry_rcu(bfqg, &bgrp->group_data, group_node) {
-+ key = rcu_dereference(bfqg->bfqd);
-+ if (key == bfqd)
-+ return bfqg;
-+ }
-+
-+ return NULL;
-+}
-+
-+static inline void bfq_group_init_entity(struct bfqio_cgroup *bgrp,
-+ struct bfq_group *bfqg)
-+{
-+ struct bfq_entity *entity = &bfqg->entity;
-+
-+ /*
-+ * If the weight of the entity has never been set via the sysfs
-+ * interface, then bgrp->weight == 0. In this case we initialize
-+ * the weight from the current ioprio value. Otherwise, the group
-+ * weight, if set, has priority over the ioprio value.
-+ */
-+ if (bgrp->weight == 0) {
-+ entity->new_weight = bfq_ioprio_to_weight(bgrp->ioprio);
-+ entity->new_ioprio = bgrp->ioprio;
-+ } else {
-+ entity->new_weight = bgrp->weight;
-+ entity->new_ioprio = bfq_weight_to_ioprio(bgrp->weight);
-+ }
-+ entity->orig_weight = entity->weight = entity->new_weight;
-+ entity->ioprio = entity->new_ioprio;
-+ entity->ioprio_class = entity->new_ioprio_class = bgrp->ioprio_class;
-+ entity->my_sched_data = &bfqg->sched_data;
-+}
-+
-+static inline void bfq_group_set_parent(struct bfq_group *bfqg,
-+ struct bfq_group *parent)
-+{
-+ struct bfq_entity *entity;
-+
-+ BUG_ON(parent == NULL);
-+ BUG_ON(bfqg == NULL);
-+
-+ entity = &bfqg->entity;
-+ entity->parent = parent->my_entity;
-+ entity->sched_data = &parent->sched_data;
-+}
-+
-+/**
-+ * bfq_group_chain_alloc - allocate a chain of groups.
-+ * @bfqd: queue descriptor.
-+ * @cgroup: the leaf cgroup this chain starts from.
-+ *
-+ * Allocate a chain of groups starting from the one belonging to
-+ * @cgroup up to the root cgroup. Stop if a cgroup on the chain
-+ * to the root has already an allocated group on @bfqd.
-+ */
-+static struct bfq_group *bfq_group_chain_alloc(struct bfq_data *bfqd,
-+ struct cgroup *cgroup)
-+{
-+ struct bfqio_cgroup *bgrp;
-+ struct bfq_group *bfqg, *prev = NULL, *leaf = NULL;
-+
-+ for (; cgroup != NULL; cgroup = cgroup->parent) {
-+ bgrp = cgroup_to_bfqio(cgroup);
-+
-+ bfqg = bfqio_lookup_group(bgrp, bfqd);
-+ if (bfqg != NULL) {
-+ /*
-+ * All the cgroups in the path from there to the
-+ * root must have a bfq_group for bfqd, so we don't
-+ * need any more allocations.
-+ */
-+ break;
-+ }
-+
-+ bfqg = kzalloc(sizeof(*bfqg), GFP_ATOMIC);
-+ if (bfqg == NULL)
-+ goto cleanup;
-+
-+ bfq_group_init_entity(bgrp, bfqg);
-+ bfqg->my_entity = &bfqg->entity;
-+
-+ if (leaf == NULL) {
-+ leaf = bfqg;
-+ prev = leaf;
-+ } else {
-+ bfq_group_set_parent(prev, bfqg);
-+ /*
-+ * Build a list of allocated nodes using the bfqd
-+ * filed, that is still unused and will be initialized
-+ * only after the node will be connected.
-+ */
-+ prev->bfqd = bfqg;
-+ prev = bfqg;
-+ }
-+ }
-+
-+ return leaf;
-+
-+cleanup:
-+ while (leaf != NULL) {
-+ prev = leaf;
-+ leaf = leaf->bfqd;
-+ kfree(prev);
-+ }
-+
-+ return NULL;
-+}
-+
-+/**
-+ * bfq_group_chain_link - link an allocatd group chain to a cgroup hierarchy.
-+ * @bfqd: the queue descriptor.
-+ * @cgroup: the leaf cgroup to start from.
-+ * @leaf: the leaf group (to be associated to @cgroup).
-+ *
-+ * Try to link a chain of groups to a cgroup hierarchy, connecting the
-+ * nodes bottom-up, so we can be sure that when we find a cgroup in the
-+ * hierarchy that already as a group associated to @bfqd all the nodes
-+ * in the path to the root cgroup have one too.
-+ *
-+ * On locking: the queue lock protects the hierarchy (there is a hierarchy
-+ * per device) while the bfqio_cgroup lock protects the list of groups
-+ * belonging to the same cgroup.
-+ */
-+static void bfq_group_chain_link(struct bfq_data *bfqd, struct cgroup *cgroup,
-+ struct bfq_group *leaf)
-+{
-+ struct bfqio_cgroup *bgrp;
-+ struct bfq_group *bfqg, *next, *prev = NULL;
-+ unsigned long flags;
-+
-+ assert_spin_locked(bfqd->queue->queue_lock);
-+
-+ for (; cgroup != NULL && leaf != NULL; cgroup = cgroup->parent) {
-+ bgrp = cgroup_to_bfqio(cgroup);
-+ next = leaf->bfqd;
-+
-+ bfqg = bfqio_lookup_group(bgrp, bfqd);
-+ BUG_ON(bfqg != NULL);
-+
-+ spin_lock_irqsave(&bgrp->lock, flags);
-+
-+ rcu_assign_pointer(leaf->bfqd, bfqd);
-+ hlist_add_head_rcu(&leaf->group_node, &bgrp->group_data);
-+ hlist_add_head(&leaf->bfqd_node, &bfqd->group_list);
-+
-+ spin_unlock_irqrestore(&bgrp->lock, flags);
-+
-+ prev = leaf;
-+ leaf = next;
-+ }
-+
-+ BUG_ON(cgroup == NULL && leaf != NULL);
-+ if (cgroup != NULL && prev != NULL) {
-+ bgrp = cgroup_to_bfqio(cgroup);
-+ bfqg = bfqio_lookup_group(bgrp, bfqd);
-+ bfq_group_set_parent(prev, bfqg);
-+ }
-+}
-+
-+/**
-+ * bfq_find_alloc_group - return the group associated to @bfqd in @cgroup.
-+ * @bfqd: queue descriptor.
-+ * @cgroup: cgroup being searched for.
-+ *
-+ * Return a group associated to @bfqd in @cgroup, allocating one if
-+ * necessary. When a group is returned all the cgroups in the path
-+ * to the root have a group associated to @bfqd.
-+ *
-+ * If the allocation fails, return the root group: this breaks guarantees
-+ * but is a safe fallbak. If this loss becames a problem it can be
-+ * mitigated using the equivalent weight (given by the product of the
-+ * weights of the groups in the path from @group to the root) in the
-+ * root scheduler.
-+ *
-+ * We allocate all the missing nodes in the path from the leaf cgroup
-+ * to the root and we connect the nodes only after all the allocations
-+ * have been successful.
-+ */
-+static struct bfq_group *bfq_find_alloc_group(struct bfq_data *bfqd,
-+ struct cgroup *cgroup)
-+{
-+ struct bfqio_cgroup *bgrp = cgroup_to_bfqio(cgroup);
-+ struct bfq_group *bfqg;
-+
-+ bfqg = bfqio_lookup_group(bgrp, bfqd);
-+ if (bfqg != NULL)
-+ return bfqg;
-+
-+ bfqg = bfq_group_chain_alloc(bfqd, cgroup);
-+ if (bfqg != NULL)
-+ bfq_group_chain_link(bfqd, cgroup, bfqg);
-+ else
-+ bfqg = bfqd->root_group;
-+
-+ return bfqg;
-+}
-+
-+/**
-+ * bfq_bfqq_move - migrate @bfqq to @bfqg.
-+ * @bfqd: queue descriptor.
-+ * @bfqq: the queue to move.
-+ * @entity: @bfqq's entity.
-+ * @bfqg: the group to move to.
-+ *
-+ * Move @bfqq to @bfqg, deactivating it from its old group and reactivating
-+ * it on the new one. Avoid putting the entity on the old group idle tree.
-+ *
-+ * Must be called under the queue lock; the cgroup owning @bfqg must
-+ * not disappear (by now this just means that we are called under
-+ * rcu_read_lock()).
-+ */
-+static void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq,
-+ struct bfq_entity *entity, struct bfq_group *bfqg)
-+{
-+ int busy, resume;
-+
-+ busy = bfq_bfqq_busy(bfqq);
-+ resume = !RB_EMPTY_ROOT(&bfqq->sort_list);
-+
-+ BUG_ON(resume && !entity->on_st);
-+ BUG_ON(busy && !resume && entity->on_st &&
-+ bfqq != bfqd->in_service_queue);
-+
-+ if (busy) {
-+ BUG_ON(atomic_read(&bfqq->ref) < 2);
-+
-+ if (!resume)
-+ bfq_del_bfqq_busy(bfqd, bfqq, 0);
-+ else
-+ bfq_deactivate_bfqq(bfqd, bfqq, 0);
-+ } else if (entity->on_st)
-+ bfq_put_idle_entity(bfq_entity_service_tree(entity), entity);
-+
-+ /*
-+ * Here we use a reference to bfqg. We don't need a refcounter
-+ * as the cgroup reference will not be dropped, so that its
-+ * destroy() callback will not be invoked.
-+ */
-+ entity->parent = bfqg->my_entity;
-+ entity->sched_data = &bfqg->sched_data;
-+
-+ if (busy && resume)
-+ bfq_activate_bfqq(bfqd, bfqq);
-+
-+ if (bfqd->in_service_queue == NULL && !bfqd->rq_in_driver)
-+ bfq_schedule_dispatch(bfqd);
-+}
-+
-+/**
-+ * __bfq_bic_change_cgroup - move @bic to @cgroup.
-+ * @bfqd: the queue descriptor.
-+ * @bic: the bic to move.
-+ * @cgroup: the cgroup to move to.
-+ *
-+ * Move bic to cgroup, assuming that bfqd->queue is locked; the caller
-+ * has to make sure that the reference to cgroup is valid across the call.
-+ *
-+ * NOTE: an alternative approach might have been to store the current
-+ * cgroup in bfqq and getting a reference to it, reducing the lookup
-+ * time here, at the price of slightly more complex code.
-+ */
-+static struct bfq_group *__bfq_bic_change_cgroup(struct bfq_data *bfqd,
-+ struct bfq_io_cq *bic,
-+ struct cgroup *cgroup)
-+{
-+ struct bfq_queue *async_bfqq = bic_to_bfqq(bic, 0);
-+ struct bfq_queue *sync_bfqq = bic_to_bfqq(bic, 1);
-+ struct bfq_entity *entity;
-+ struct bfq_group *bfqg;
-+ struct bfqio_cgroup *bgrp;
-+
-+ bgrp = cgroup_to_bfqio(cgroup);
-+
-+ bfqg = bfq_find_alloc_group(bfqd, cgroup);
-+ if (async_bfqq != NULL) {
-+ entity = &async_bfqq->entity;
-+
-+ if (entity->sched_data != &bfqg->sched_data) {
-+ bic_set_bfqq(bic, NULL, 0);
-+ bfq_log_bfqq(bfqd, async_bfqq,
-+ "bic_change_group: %p %d",
-+ async_bfqq, atomic_read(&async_bfqq->ref));
-+ bfq_put_queue(async_bfqq);
-+ }
-+ }
-+
-+ if (sync_bfqq != NULL) {
-+ entity = &sync_bfqq->entity;
-+ if (entity->sched_data != &bfqg->sched_data)
-+ bfq_bfqq_move(bfqd, sync_bfqq, entity, bfqg);
-+ }
-+
-+ return bfqg;
-+}
-+
-+/**
-+ * bfq_bic_change_cgroup - move @bic to @cgroup.
-+ * @bic: the bic being migrated.
-+ * @cgroup: the destination cgroup.
-+ *
-+ * When the task owning @bic is moved to @cgroup, @bic is immediately
-+ * moved into its new parent group.
-+ */
-+static void bfq_bic_change_cgroup(struct bfq_io_cq *bic,
-+ struct cgroup *cgroup)
-+{
-+ struct bfq_data *bfqd;
-+ unsigned long uninitialized_var(flags);
-+
-+ bfqd = bfq_get_bfqd_locked(&(bic->icq.q->elevator->elevator_data),
-+ &flags);
-+ if (bfqd != NULL) {
-+ __bfq_bic_change_cgroup(bfqd, bic, cgroup);
-+ bfq_put_bfqd_unlock(bfqd, &flags);
-+ }
-+}
-+
-+/**
-+ * bfq_bic_update_cgroup - update the cgroup of @bic.
-+ * @bic: the @bic to update.
-+ *
-+ * Make sure that @bic is enqueued in the cgroup of the current task.
-+ * We need this in addition to moving bics during the cgroup attach
-+ * phase because the task owning @bic could be at its first disk
-+ * access or we may end up in the root cgroup as the result of a
-+ * memory allocation failure and here we try to move to the right
-+ * group.
-+ *
-+ * Must be called under the queue lock. It is safe to use the returned
-+ * value even after the rcu_read_unlock() as the migration/destruction
-+ * paths act under the queue lock too. IOW it is impossible to race with
-+ * group migration/destruction and end up with an invalid group as:
-+ * a) here cgroup has not yet been destroyed, nor its destroy callback
-+ * has started execution, as current holds a reference to it,
-+ * b) if it is destroyed after rcu_read_unlock() [after current is
-+ * migrated to a different cgroup] its attach() callback will have
-+ * taken care of remove all the references to the old cgroup data.
-+ */
-+static struct bfq_group *bfq_bic_update_cgroup(struct bfq_io_cq *bic)
-+{
-+ struct bfq_data *bfqd = bic_to_bfqd(bic);
-+ struct bfq_group *bfqg;
-+ struct cgroup *cgroup;
-+
-+ BUG_ON(bfqd == NULL);
-+
-+ rcu_read_lock();
-+ cgroup = task_cgroup(current, bfqio_subsys_id);
-+ bfqg = __bfq_bic_change_cgroup(bfqd, bic, cgroup);
-+ rcu_read_unlock();
-+
-+ return bfqg;
-+}
-+
-+/**
-+ * bfq_flush_idle_tree - deactivate any entity on the idle tree of @st.
-+ * @st: the service tree being flushed.
-+ */
-+static inline void bfq_flush_idle_tree(struct bfq_service_tree *st)
-+{
-+ struct bfq_entity *entity = st->first_idle;
-+
-+ for (; entity != NULL; entity = st->first_idle)
-+ __bfq_deactivate_entity(entity, 0);
-+}
-+
-+/**
-+ * bfq_reparent_leaf_entity - move leaf entity to the root_group.
-+ * @bfqd: the device data structure with the root group.
-+ * @entity: the entity to move.
-+ */
-+static inline void bfq_reparent_leaf_entity(struct bfq_data *bfqd,
-+ struct bfq_entity *entity)
-+{
-+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
-+
-+ BUG_ON(bfqq == NULL);
-+ bfq_bfqq_move(bfqd, bfqq, entity, bfqd->root_group);
-+ return;
-+}
-+
-+/**
-+ * bfq_reparent_active_entities - move to the root group all active entities.
-+ * @bfqd: the device data structure with the root group.
-+ * @bfqg: the group to move from.
-+ * @st: the service tree with the entities.
-+ *
-+ * Needs queue_lock to be taken and reference to be valid over the call.
-+ */
-+static inline void bfq_reparent_active_entities(struct bfq_data *bfqd,
-+ struct bfq_group *bfqg,
-+ struct bfq_service_tree *st)
-+{
-+ struct rb_root *active = &st->active;
-+ struct bfq_entity *entity = NULL;
-+
-+ if (!RB_EMPTY_ROOT(&st->active))
-+ entity = bfq_entity_of(rb_first(active));
-+
-+ for (; entity != NULL; entity = bfq_entity_of(rb_first(active)))
-+ bfq_reparent_leaf_entity(bfqd, entity);
-+
-+ if (bfqg->sched_data.active_entity != NULL)
-+ bfq_reparent_leaf_entity(bfqd, bfqg->sched_data.active_entity);
-+
-+ return;
-+}
-+
-+/**
-+ * bfq_destroy_group - destroy @bfqg.
-+ * @bgrp: the bfqio_cgroup containing @bfqg.
-+ * @bfqg: the group being destroyed.
-+ *
-+ * Destroy @bfqg, making sure that it is not referenced from its parent.
-+ */
-+static void bfq_destroy_group(struct bfqio_cgroup *bgrp, struct bfq_group *bfqg)
-+{
-+ struct bfq_data *bfqd;
-+ struct bfq_service_tree *st;
-+ struct bfq_entity *entity = bfqg->my_entity;
-+ unsigned long uninitialized_var(flags);
-+ int i;
-+
-+ hlist_del(&bfqg->group_node);
-+
-+ /*
-+ * Empty all service_trees belonging to this group before deactivating
-+ * the group itself.
-+ */
-+ for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) {
-+ st = bfqg->sched_data.service_tree + i;
-+
-+ /*
-+ * The idle tree may still contain bfq_queues belonging
-+ * to exited task because they never migrated to a different
-+ * cgroup from the one being destroyed now. Noone else
-+ * can access them so it's safe to act without any lock.
-+ */
-+ bfq_flush_idle_tree(st);
-+
-+ /*
-+ * It may happen that some queues are still active
-+ * (busy) upon group destruction (if the corresponding
-+ * processes have been forced to terminate). We move
-+ * all the leaf entities corresponding to these queues
-+ * to the root_group.
-+ * Also, it may happen that the group has an entity
-+ * under service, which is disconnected from the active
-+ * tree: it must be moved, too.
-+ * There is no need to put the sync queues, as the
-+ * scheduler has taken no reference.
-+ */
-+ bfqd = bfq_get_bfqd_locked(&bfqg->bfqd, &flags);
-+ if (bfqd != NULL) {
-+ bfq_reparent_active_entities(bfqd, bfqg, st);
-+ bfq_put_bfqd_unlock(bfqd, &flags);
-+ }
-+ BUG_ON(!RB_EMPTY_ROOT(&st->active));
-+ BUG_ON(!RB_EMPTY_ROOT(&st->idle));
-+ }
-+ BUG_ON(bfqg->sched_data.next_active != NULL);
-+ BUG_ON(bfqg->sched_data.active_entity != NULL);
-+
-+ /*
-+ * We may race with device destruction, take extra care when
-+ * dereferencing bfqg->bfqd.
-+ */
-+ bfqd = bfq_get_bfqd_locked(&bfqg->bfqd, &flags);
-+ if (bfqd != NULL) {
-+ hlist_del(&bfqg->bfqd_node);
-+ __bfq_deactivate_entity(entity, 0);
-+ bfq_put_async_queues(bfqd, bfqg);
-+ bfq_put_bfqd_unlock(bfqd, &flags);
-+ }
-+ BUG_ON(entity->tree != NULL);
-+
-+ /*
-+ * No need to defer the kfree() to the end of the RCU grace
-+ * period: we are called from the destroy() callback of our
-+ * cgroup, so we can be sure that noone is a) still using
-+ * this cgroup or b) doing lookups in it.
-+ */
-+ kfree(bfqg);
-+}
-+
-+static void bfq_end_raising_async(struct bfq_data *bfqd)
-+{
-+ struct hlist_node *tmp;
-+ struct bfq_group *bfqg;
-+
-+ hlist_for_each_entry_safe(bfqg, tmp, &bfqd->group_list, bfqd_node)
-+ bfq_end_raising_async_queues(bfqd, bfqg);
-+ bfq_end_raising_async_queues(bfqd, bfqd->root_group);
-+}
-+
-+/**
-+ * bfq_disconnect_groups - diconnect @bfqd from all its groups.
-+ * @bfqd: the device descriptor being exited.
-+ *
-+ * When the device exits we just make sure that no lookup can return
-+ * the now unused group structures. They will be deallocated on cgroup
-+ * destruction.
-+ */
-+static void bfq_disconnect_groups(struct bfq_data *bfqd)
-+{
-+ struct hlist_node *tmp;
-+ struct bfq_group *bfqg;
-+
-+ bfq_log(bfqd, "disconnect_groups beginning");
-+ hlist_for_each_entry_safe(bfqg, tmp, &bfqd->group_list, bfqd_node) {
-+ hlist_del(&bfqg->bfqd_node);
-+
-+ __bfq_deactivate_entity(bfqg->my_entity, 0);
-+
-+ /*
-+ * Don't remove from the group hash, just set an
-+ * invalid key. No lookups can race with the
-+ * assignment as bfqd is being destroyed; this
-+ * implies also that new elements cannot be added
-+ * to the list.
-+ */
-+ rcu_assign_pointer(bfqg->bfqd, NULL);
-+
-+ bfq_log(bfqd, "disconnect_groups: put async for group %p",
-+ bfqg);
-+ bfq_put_async_queues(bfqd, bfqg);
-+ }
-+}
-+
-+static inline void bfq_free_root_group(struct bfq_data *bfqd)
-+{
-+ struct bfqio_cgroup *bgrp = &bfqio_root_cgroup;
-+ struct bfq_group *bfqg = bfqd->root_group;
-+
-+ bfq_put_async_queues(bfqd, bfqg);
-+
-+ spin_lock_irq(&bgrp->lock);
-+ hlist_del_rcu(&bfqg->group_node);
-+ spin_unlock_irq(&bgrp->lock);
-+
-+ /*
-+ * No need to synchronize_rcu() here: since the device is gone
-+ * there cannot be any read-side access to its root_group.
-+ */
-+ kfree(bfqg);
-+}
-+
-+static struct bfq_group *bfq_alloc_root_group(struct bfq_data *bfqd, int node)
-+{
-+ struct bfq_group *bfqg;
-+ struct bfqio_cgroup *bgrp;
-+ int i;
-+
-+ bfqg = kzalloc_node(sizeof(*bfqg), GFP_KERNEL, node);
-+ if (bfqg == NULL)
-+ return NULL;
-+
-+ bfqg->entity.parent = NULL;
-+ for (i = 0; i < BFQ_IOPRIO_CLASSES; i++)
-+ bfqg->sched_data.service_tree[i] = BFQ_SERVICE_TREE_INIT;
-+
-+ bgrp = &bfqio_root_cgroup;
-+ spin_lock_irq(&bgrp->lock);
-+ rcu_assign_pointer(bfqg->bfqd, bfqd);
-+ hlist_add_head_rcu(&bfqg->group_node, &bgrp->group_data);
-+ spin_unlock_irq(&bgrp->lock);
-+
-+ return bfqg;
-+}
-+
-+#define SHOW_FUNCTION(__VAR) \
-+static u64 bfqio_cgroup_##__VAR##_read(struct cgroup *cgroup, \
-+ struct cftype *cftype) \
-+{ \
-+ struct bfqio_cgroup *bgrp; \
-+ u64 ret = -ENODEV; \
-+ \
-+ mutex_lock(&bfqio_mutex); \
-+ if (bfqio_is_removed(cgroup)) \
-+ goto out_unlock; \
-+ \
-+ bgrp = cgroup_to_bfqio(cgroup); \
-+ spin_lock_irq(&bgrp->lock); \
-+ ret = bgrp->__VAR; \
-+ spin_unlock_irq(&bgrp->lock); \
-+ \
-+out_unlock: \
-+ mutex_unlock(&bfqio_mutex); \
-+ return ret; \
-+}
-+
-+SHOW_FUNCTION(weight);
-+SHOW_FUNCTION(ioprio);
-+SHOW_FUNCTION(ioprio_class);
-+#undef SHOW_FUNCTION
-+
-+#define STORE_FUNCTION(__VAR, __MIN, __MAX) \
-+static int bfqio_cgroup_##__VAR##_write(struct cgroup *cgroup, \
-+ struct cftype *cftype, \
-+ u64 val) \
-+{ \
-+ struct bfqio_cgroup *bgrp; \
-+ struct bfq_group *bfqg; \
-+ int ret = -EINVAL; \
-+ \
-+ if (val < (__MIN) || val > (__MAX)) \
-+ return ret; \
-+ \
-+ ret = -ENODEV; \
-+ mutex_lock(&bfqio_mutex); \
-+ if (bfqio_is_removed(cgroup)) \
-+ goto out_unlock; \
-+ ret = 0; \
-+ \
-+ bgrp = cgroup_to_bfqio(cgroup); \
-+ \
-+ spin_lock_irq(&bgrp->lock); \
-+ bgrp->__VAR = (unsigned short)val; \
-+ hlist_for_each_entry(bfqg, &bgrp->group_data, group_node) { \
-+ /* \
-+ * Setting the ioprio_changed flag of the entity \
-+ * to 1 with new_##__VAR == ##__VAR would re-set \
-+ * the value of the weight to its ioprio mapping. \
-+ * Set the flag only if necessary. \
-+ */ \
-+ if ((unsigned short)val != bfqg->entity.new_##__VAR) { \
-+ bfqg->entity.new_##__VAR = (unsigned short)val; \
-+ smp_wmb(); \
-+ bfqg->entity.ioprio_changed = 1; \
-+ } \
-+ } \
-+ spin_unlock_irq(&bgrp->lock); \
-+ \
-+out_unlock: \
-+ mutex_unlock(&bfqio_mutex); \
-+ return ret; \
-+}
-+
-+STORE_FUNCTION(weight, BFQ_MIN_WEIGHT, BFQ_MAX_WEIGHT);
-+STORE_FUNCTION(ioprio, 0, IOPRIO_BE_NR - 1);
-+STORE_FUNCTION(ioprio_class, IOPRIO_CLASS_RT, IOPRIO_CLASS_IDLE);
-+#undef STORE_FUNCTION
-+
-+static struct cftype bfqio_files[] = {
-+ {
-+ .name = "weight",
-+ .read_u64 = bfqio_cgroup_weight_read,
-+ .write_u64 = bfqio_cgroup_weight_write,
-+ },
-+ {
-+ .name = "ioprio",
-+ .read_u64 = bfqio_cgroup_ioprio_read,
-+ .write_u64 = bfqio_cgroup_ioprio_write,
-+ },
-+ {
-+ .name = "ioprio_class",
-+ .read_u64 = bfqio_cgroup_ioprio_class_read,
-+ .write_u64 = bfqio_cgroup_ioprio_class_write,
-+ },
-+ { }, /* terminate */
-+};
-+
-+static struct cgroup_subsys_state *bfqio_create(struct cgroup *cgroup)
-+{
-+ struct bfqio_cgroup *bgrp;
-+
-+ if (cgroup->parent != NULL) {
-+ bgrp = kzalloc(sizeof(*bgrp), GFP_KERNEL);
-+ if (bgrp == NULL)
-+ return ERR_PTR(-ENOMEM);
-+ } else
-+ bgrp = &bfqio_root_cgroup;
-+
-+ spin_lock_init(&bgrp->lock);
-+ INIT_HLIST_HEAD(&bgrp->group_data);
-+ bgrp->ioprio = BFQ_DEFAULT_GRP_IOPRIO;
-+ bgrp->ioprio_class = BFQ_DEFAULT_GRP_CLASS;
-+
-+ return &bgrp->css;
-+}
-+
-+/*
-+ * We cannot support shared io contexts, as we have no means to support
-+ * two tasks with the same ioc in two different groups without major rework
-+ * of the main bic/bfqq data structures. By now we allow a task to change
-+ * its cgroup only if it's the only owner of its ioc; the drawback of this
-+ * behavior is that a group containing a task that forked using CLONE_IO
-+ * will not be destroyed until the tasks sharing the ioc die.
-+ */
-+static int bfqio_can_attach(struct cgroup *cgroup, struct cgroup_taskset *tset)
-+{
-+ struct task_struct *task;
-+ struct io_context *ioc;
-+ int ret = 0;
-+
-+ cgroup_taskset_for_each(task, cgroup, tset) {
-+ /* task_lock() is needed to avoid races with exit_io_context() */
-+ task_lock(task);
-+ ioc = task->io_context;
-+ if (ioc != NULL && atomic_read(&ioc->nr_tasks) > 1)
-+ /*
-+ * ioc == NULL means that the task is either too young or
-+ * exiting: if it has still no ioc the ioc can't be shared,
-+ * if the task is exiting the attach will fail anyway, no
-+ * matter what we return here.
-+ */
-+ ret = -EINVAL;
-+ task_unlock(task);
-+ if (ret)
-+ break;
-+ }
-+
-+ return ret;
-+}
-+
-+static void bfqio_attach(struct cgroup *cgroup, struct cgroup_taskset *tset)
-+{
-+ struct task_struct *task;
-+ struct io_context *ioc;
-+ struct io_cq *icq;
-+
-+ /*
-+ * IMPORTANT NOTE: The move of more than one process at a time to a
-+ * new group has not yet been tested.
-+ */
-+ cgroup_taskset_for_each(task, cgroup, tset) {
-+ ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
-+ if (ioc) {
-+ /*
-+ * Handle cgroup change here.
-+ */
-+ rcu_read_lock();
-+ hlist_for_each_entry_rcu(icq, &ioc->icq_list, ioc_node)
-+ if (!strncmp(
-+ icq->q->elevator->type->elevator_name,
-+ "bfq", ELV_NAME_MAX))
-+ bfq_bic_change_cgroup(icq_to_bic(icq),
-+ cgroup);
-+ rcu_read_unlock();
-+ put_io_context(ioc);
-+ }
-+ }
-+}
-+
-+static void bfqio_destroy(struct cgroup *cgroup)
-+{
-+ struct bfqio_cgroup *bgrp = cgroup_to_bfqio(cgroup);
-+ struct hlist_node *tmp;
-+ struct bfq_group *bfqg;
-+
-+ /*
-+ * Since we are destroying the cgroup, there are no more tasks
-+ * referencing it, and all the RCU grace periods that may have
-+ * referenced it are ended (as the destruction of the parent
-+ * cgroup is RCU-safe); bgrp->group_data will not be accessed by
-+ * anything else and we don't need any synchronization.
-+ */
-+ hlist_for_each_entry_safe(bfqg, tmp, &bgrp->group_data, group_node)
-+ bfq_destroy_group(bgrp, bfqg);
-+
-+ BUG_ON(!hlist_empty(&bgrp->group_data));
-+
-+ kfree(bgrp);
-+}
-+
-+struct cgroup_subsys bfqio_subsys = {
-+ .name = "bfqio",
-+ .css_alloc = bfqio_create,
-+ .can_attach = bfqio_can_attach,
-+ .attach = bfqio_attach,
-+ .css_free = bfqio_destroy,
-+ .subsys_id = bfqio_subsys_id,
-+ .base_cftypes = bfqio_files,
-+};
-+#else
-+static inline void bfq_init_entity(struct bfq_entity *entity,
-+ struct bfq_group *bfqg)
-+{
-+ entity->weight = entity->new_weight;
-+ entity->orig_weight = entity->new_weight;
-+ entity->ioprio = entity->new_ioprio;
-+ entity->ioprio_class = entity->new_ioprio_class;
-+ entity->sched_data = &bfqg->sched_data;
-+}
-+
-+static inline struct bfq_group *
-+bfq_bic_update_cgroup(struct bfq_io_cq *bic)
-+{
-+ struct bfq_data *bfqd = bic_to_bfqd(bic);
-+ return bfqd->root_group;
-+}
-+
-+static inline void bfq_bfqq_move(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq,
-+ struct bfq_entity *entity,
-+ struct bfq_group *bfqg)
-+{
-+}
-+
-+static void bfq_end_raising_async(struct bfq_data *bfqd)
-+{
-+ bfq_end_raising_async_queues(bfqd, bfqd->root_group);
-+}
-+
-+static inline void bfq_disconnect_groups(struct bfq_data *bfqd)
-+{
-+ bfq_put_async_queues(bfqd, bfqd->root_group);
-+}
-+
-+static inline void bfq_free_root_group(struct bfq_data *bfqd)
-+{
-+ kfree(bfqd->root_group);
-+}
-+
-+static struct bfq_group *bfq_alloc_root_group(struct bfq_data *bfqd, int node)
-+{
-+ struct bfq_group *bfqg;
-+ int i;
-+
-+ bfqg = kmalloc_node(sizeof(*bfqg), GFP_KERNEL | __GFP_ZERO, node);
-+ if (bfqg == NULL)
-+ return NULL;
-+
-+ for (i = 0; i < BFQ_IOPRIO_CLASSES; i++)
-+ bfqg->sched_data.service_tree[i] = BFQ_SERVICE_TREE_INIT;
-+
-+ return bfqg;
-+}
-+#endif
-diff --git a/block/bfq-ioc.c b/block/bfq-ioc.c
-new file mode 100644
-index 0000000..7f6b000
---- /dev/null
-+++ b/block/bfq-ioc.c
-@@ -0,0 +1,36 @@
-+/*
-+ * BFQ: I/O context handling.
-+ *
-+ * Based on ideas and code from CFQ:
-+ * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
-+ *
-+ * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
-+ * Paolo Valente <paolo.valente@unimore.it>
-+ *
-+ * Copyright (C) 2010 Paolo Valente <paolo.valente@unimore.it>
-+ */
-+
-+/**
-+ * icq_to_bic - convert iocontext queue structure to bfq_io_cq.
-+ * @icq: the iocontext queue.
-+ */
-+static inline struct bfq_io_cq *icq_to_bic(struct io_cq *icq)
-+{
-+ /* bic->icq is the first member, %NULL will convert to %NULL */
-+ return container_of(icq, struct bfq_io_cq, icq);
-+}
-+
-+/**
-+ * bfq_bic_lookup - search into @ioc a bic associated to @bfqd.
-+ * @bfqd: the lookup key.
-+ * @ioc: the io_context of the process doing I/O.
-+ *
-+ * Queue lock must be held.
-+ */
-+static inline struct bfq_io_cq *bfq_bic_lookup(struct bfq_data *bfqd,
-+ struct io_context *ioc)
-+{
-+ if (ioc)
-+ return icq_to_bic(ioc_lookup_icq(ioc, bfqd->queue));
-+ return NULL;
-+}
-diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
-new file mode 100644
-index 0000000..96abb81
---- /dev/null
-+++ b/block/bfq-iosched.c
-@@ -0,0 +1,3256 @@
-+/*
-+ * BFQ, or Budget Fair Queueing, disk scheduler.
-+ *
-+ * Based on ideas and code from CFQ:
-+ * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
-+ *
-+ * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
-+ * Paolo Valente <paolo.valente@unimore.it>
-+ *
-+ * Copyright (C) 2010 Paolo Valente <paolo.valente@unimore.it>
-+ *
-+ * Licensed under the GPL-2 as detailed in the accompanying COPYING.BFQ file.
-+ *
-+ * BFQ is a proportional share disk scheduling algorithm based on the
-+ * slice-by-slice service scheme of CFQ. But BFQ assigns budgets, measured in
-+ * number of sectors, to tasks instead of time slices. The disk is not granted
-+ * to the in-service task for a given time slice, but until it has exahusted
-+ * its assigned budget. This change from the time to the service domain allows
-+ * BFQ to distribute the disk bandwidth among tasks as desired, without any
-+ * distortion due to ZBR, workload fluctuations or other factors. BFQ uses an
-+ * ad hoc internal scheduler, called B-WF2Q+, to schedule tasks according to
-+ * their budgets (more precisely BFQ schedules queues associated to tasks).
-+ * Thanks to this accurate scheduler, BFQ can afford to assign high budgets to
-+ * disk-bound non-seeky tasks (to boost the throughput), and yet guarantee low
-+ * latencies to interactive and soft real-time applications.
-+ *
-+ * BFQ is described in [1], where also a reference to the initial, more
-+ * theoretical paper on BFQ can be found. The interested reader can find in
-+ * the latter paper full details on the main algorithm as well as formulas of
-+ * the guarantees, plus formal proofs of all the properties. With respect to
-+ * the version of BFQ presented in these papers, this implementation adds a
-+ * few more heuristics, such as the one that guarantees a low latency to soft
-+ * real-time applications, and a hierarchical extension based on H-WF2Q+.
-+ *
-+ * B-WF2Q+ is based on WF2Q+, that is described in [2], together with
-+ * H-WF2Q+, while the augmented tree used to implement B-WF2Q+ with O(log N)
-+ * complexity derives from the one introduced with EEVDF in [3].
-+ *
-+ * [1] P. Valente and M. Andreolini, ``Improving Application Responsiveness
-+ * with the BFQ Disk I/O Scheduler'',
-+ * Proceedings of the 5th Annual International Systems and Storage
-+ * Conference (SYSTOR '12), June 2012.
-+ *
-+ * http://algogroup.unimo.it/people/paolo/disk_sched/bf1-v1-suite-results.pdf
-+ *
-+ * [2] Jon C.R. Bennett and H. Zhang, ``Hierarchical Packet Fair Queueing
-+ * Algorithms,'' IEEE/ACM Transactions on Networking, 5(5):675-689,
-+ * Oct 1997.
-+ *
-+ * http://www.cs.cmu.edu/~hzhang/papers/TON-97-Oct.ps.gz
-+ *
-+ * [3] I. Stoica and H. Abdel-Wahab, ``Earliest Eligible Virtual Deadline
-+ * First: A Flexible and Accurate Mechanism for Proportional Share
-+ * Resource Allocation,'' technical report.
-+ *
-+ * http://www.cs.berkeley.edu/~istoica/papers/eevdf-tr-95.pdf
-+ */
-+#include <linux/module.h>
-+#include <linux/slab.h>
-+#include <linux/blkdev.h>
-+#include <linux/cgroup.h>
-+#include <linux/elevator.h>
-+#include <linux/jiffies.h>
-+#include <linux/rbtree.h>
-+#include <linux/ioprio.h>
-+#include "bfq.h"
-+#include "blk.h"
-+
-+/* Max number of dispatches in one round of service. */
-+static const int bfq_quantum = 4;
-+
-+/* Expiration time of sync (0) and async (1) requests, in jiffies. */
-+static const int bfq_fifo_expire[2] = { HZ / 4, HZ / 8 };
-+
-+/* Maximum backwards seek, in KiB. */
-+static const int bfq_back_max = 16 * 1024;
-+
-+/* Penalty of a backwards seek, in number of sectors. */
-+static const int bfq_back_penalty = 2;
-+
-+/* Idling period duration, in jiffies. */
-+static int bfq_slice_idle = HZ / 125;
-+
-+/* Default maximum budget values, in sectors and number of requests. */
-+static const int bfq_default_max_budget = 16 * 1024;
-+static const int bfq_max_budget_async_rq = 4;
-+
-+/*
-+ * Async to sync throughput distribution is controlled as follows:
-+ * when an async request is served, the entity is charged the number
-+ * of sectors of the request, multipled by the factor below
-+ */
-+static const int bfq_async_charge_factor = 10;
-+
-+/* Default timeout values, in jiffies, approximating CFQ defaults. */
-+static const int bfq_timeout_sync = HZ / 8;
-+static int bfq_timeout_async = HZ / 25;
-+
-+struct kmem_cache *bfq_pool;
-+
-+/* Below this threshold (in ms), we consider thinktime immediate. */
-+#define BFQ_MIN_TT 2
-+
-+/* hw_tag detection: parallel requests threshold and min samples needed. */
-+#define BFQ_HW_QUEUE_THRESHOLD 4
-+#define BFQ_HW_QUEUE_SAMPLES 32
-+
-+#define BFQQ_SEEK_THR (sector_t)(8 * 1024)
-+#define BFQQ_SEEKY(bfqq) ((bfqq)->seek_mean > BFQQ_SEEK_THR)
-+
-+/* Min samples used for peak rate estimation (for autotuning). */
-+#define BFQ_PEAK_RATE_SAMPLES 32
-+
-+/* Shift used for peak rate fixed precision calculations. */
-+#define BFQ_RATE_SHIFT 16
-+
-+/*
-+ * The duration of the weight raising for interactive applications is
-+ * computed automatically (as default behaviour), using the following
-+ * formula: duration = (R / r) * T, where r is the peak rate of the
-+ * disk, and R and T are two reference parameters. In particular, R is
-+ * the peak rate of a reference disk, and T is about the maximum time
-+ * for starting popular large applications on that disk, under BFQ and
-+ * while reading two files in parallel. Finally, BFQ uses two
-+ * different pairs (R, T) depending on whether the disk is rotational
-+ * or non-rotational.
-+ */
-+#define T_rot (msecs_to_jiffies(5500))
-+#define T_nonrot (msecs_to_jiffies(2000))
-+/* Next two quantities are in sectors/usec, left-shifted by BFQ_RATE_SHIFT */
-+#define R_rot 17415
-+#define R_nonrot 34791
-+
-+#define BFQ_SERVICE_TREE_INIT ((struct bfq_service_tree) \
-+ { RB_ROOT, RB_ROOT, NULL, NULL, 0, 0 })
-+
-+#define RQ_BIC(rq) ((struct bfq_io_cq *) (rq)->elv.priv[0])
-+#define RQ_BFQQ(rq) ((rq)->elv.priv[1])
-+
-+static inline void bfq_schedule_dispatch(struct bfq_data *bfqd);
-+
-+#include "bfq-ioc.c"
-+#include "bfq-sched.c"
-+#include "bfq-cgroup.c"
-+
-+#define bfq_class_idle(bfqq) ((bfqq)->entity.ioprio_class ==\
-+ IOPRIO_CLASS_IDLE)
-+#define bfq_class_rt(bfqq) ((bfqq)->entity.ioprio_class ==\
-+ IOPRIO_CLASS_RT)
-+
-+#define bfq_sample_valid(samples) ((samples) > 80)
-+
-+/*
-+ * We regard a request as SYNC, if either it's a read or has the SYNC bit
-+ * set (in which case it could also be a direct WRITE).
-+ */
-+static inline int bfq_bio_sync(struct bio *bio)
-+{
-+ if (bio_data_dir(bio) == READ || (bio->bi_rw & REQ_SYNC))
-+ return 1;
-+
-+ return 0;
-+}
-+
-+/*
-+ * Scheduler run of queue, if there are requests pending and no one in the
-+ * driver that will restart queueing.
-+ */
-+static inline void bfq_schedule_dispatch(struct bfq_data *bfqd)
-+{
-+ if (bfqd->queued != 0) {
-+ bfq_log(bfqd, "schedule dispatch");
-+ kblockd_schedule_work(bfqd->queue, &bfqd->unplug_work);
-+ }
-+}
-+
-+/*
-+ * Lifted from AS - choose which of rq1 and rq2 that is best served now.
-+ * We choose the request that is closesr to the head right now. Distance
-+ * behind the head is penalized and only allowed to a certain extent.
-+ */
-+static struct request *bfq_choose_req(struct bfq_data *bfqd,
-+ struct request *rq1,
-+ struct request *rq2,
-+ sector_t last)
-+{
-+ sector_t s1, s2, d1 = 0, d2 = 0;
-+ unsigned long back_max;
-+#define BFQ_RQ1_WRAP 0x01 /* request 1 wraps */
-+#define BFQ_RQ2_WRAP 0x02 /* request 2 wraps */
-+ unsigned wrap = 0; /* bit mask: requests behind the disk head? */
-+
-+ if (rq1 == NULL || rq1 == rq2)
-+ return rq2;
-+ if (rq2 == NULL)
-+ return rq1;
-+
-+ if (rq_is_sync(rq1) && !rq_is_sync(rq2))
-+ return rq1;
-+ else if (rq_is_sync(rq2) && !rq_is_sync(rq1))
-+ return rq2;
-+ if ((rq1->cmd_flags & REQ_META) && !(rq2->cmd_flags & REQ_META))
-+ return rq1;
-+ else if ((rq2->cmd_flags & REQ_META) && !(rq1->cmd_flags & REQ_META))
-+ return rq2;
-+
-+ s1 = blk_rq_pos(rq1);
-+ s2 = blk_rq_pos(rq2);
-+
-+ /*
-+ * By definition, 1KiB is 2 sectors.
-+ */
-+ back_max = bfqd->bfq_back_max * 2;
-+
-+ /*
-+ * Strict one way elevator _except_ in the case where we allow
-+ * short backward seeks which are biased as twice the cost of a
-+ * similar forward seek.
-+ */
-+ if (s1 >= last)
-+ d1 = s1 - last;
-+ else if (s1 + back_max >= last)
-+ d1 = (last - s1) * bfqd->bfq_back_penalty;
-+ else
-+ wrap |= BFQ_RQ1_WRAP;
-+
-+ if (s2 >= last)
-+ d2 = s2 - last;
-+ else if (s2 + back_max >= last)
-+ d2 = (last - s2) * bfqd->bfq_back_penalty;
-+ else
-+ wrap |= BFQ_RQ2_WRAP;
-+
-+ /* Found required data */
-+
-+ /*
-+ * By doing switch() on the bit mask "wrap" we avoid having to
-+ * check two variables for all permutations: --> faster!
-+ */
-+ switch (wrap) {
-+ case 0: /* common case for CFQ: rq1 and rq2 not wrapped */
-+ if (d1 < d2)
-+ return rq1;
-+ else if (d2 < d1)
-+ return rq2;
-+ else {
-+ if (s1 >= s2)
-+ return rq1;
-+ else
-+ return rq2;
-+ }
-+
-+ case BFQ_RQ2_WRAP:
-+ return rq1;
-+ case BFQ_RQ1_WRAP:
-+ return rq2;
-+ case (BFQ_RQ1_WRAP|BFQ_RQ2_WRAP): /* both rqs wrapped */
-+ default:
-+ /*
-+ * Since both rqs are wrapped,
-+ * start with the one that's further behind head
-+ * (--> only *one* back seek required),
-+ * since back seek takes more time than forward.
-+ */
-+ if (s1 <= s2)
-+ return rq1;
-+ else
-+ return rq2;
-+ }
-+}
-+
-+static struct bfq_queue *
-+bfq_rq_pos_tree_lookup(struct bfq_data *bfqd, struct rb_root *root,
-+ sector_t sector, struct rb_node **ret_parent,
-+ struct rb_node ***rb_link)
-+{
-+ struct rb_node **p, *parent;
-+ struct bfq_queue *bfqq = NULL;
-+
-+ parent = NULL;
-+ p = &root->rb_node;
-+ while (*p) {
-+ struct rb_node **n;
-+
-+ parent = *p;
-+ bfqq = rb_entry(parent, struct bfq_queue, pos_node);
-+
-+ /*
-+ * Sort strictly based on sector. Smallest to the left,
-+ * largest to the right.
-+ */
-+ if (sector > blk_rq_pos(bfqq->next_rq))
-+ n = &(*p)->rb_right;
-+ else if (sector < blk_rq_pos(bfqq->next_rq))
-+ n = &(*p)->rb_left;
-+ else
-+ break;
-+ p = n;
-+ bfqq = NULL;
-+ }
-+
-+ *ret_parent = parent;
-+ if (rb_link)
-+ *rb_link = p;
-+
-+ bfq_log(bfqd, "rq_pos_tree_lookup %llu: returning %d",
-+ (long long unsigned)sector,
-+ bfqq != NULL ? bfqq->pid : 0);
-+
-+ return bfqq;
-+}
-+
-+static void bfq_rq_pos_tree_add(struct bfq_data *bfqd, struct bfq_queue *bfqq)
-+{
-+ struct rb_node **p, *parent;
-+ struct bfq_queue *__bfqq;
-+
-+ if (bfqq->pos_root != NULL) {
-+ rb_erase(&bfqq->pos_node, bfqq->pos_root);
-+ bfqq->pos_root = NULL;
-+ }
-+
-+ if (bfq_class_idle(bfqq))
-+ return;
-+ if (!bfqq->next_rq)
-+ return;
-+
-+ bfqq->pos_root = &bfqd->rq_pos_tree;
-+ __bfqq = bfq_rq_pos_tree_lookup(bfqd, bfqq->pos_root,
-+ blk_rq_pos(bfqq->next_rq), &parent, &p);
-+ if (__bfqq == NULL) {
-+ rb_link_node(&bfqq->pos_node, parent, p);
-+ rb_insert_color(&bfqq->pos_node, bfqq->pos_root);
-+ } else
-+ bfqq->pos_root = NULL;
-+}
-+
-+static struct request *bfq_find_next_rq(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq,
-+ struct request *last)
-+{
-+ struct rb_node *rbnext = rb_next(&last->rb_node);
-+ struct rb_node *rbprev = rb_prev(&last->rb_node);
-+ struct request *next = NULL, *prev = NULL;
-+
-+ BUG_ON(RB_EMPTY_NODE(&last->rb_node));
-+
-+ if (rbprev != NULL)
-+ prev = rb_entry_rq(rbprev);
-+
-+ if (rbnext != NULL)
-+ next = rb_entry_rq(rbnext);
-+ else {
-+ rbnext = rb_first(&bfqq->sort_list);
-+ if (rbnext && rbnext != &last->rb_node)
-+ next = rb_entry_rq(rbnext);
-+ }
-+
-+ return bfq_choose_req(bfqd, next, prev, blk_rq_pos(last));
-+}
-+
-+static void bfq_del_rq_rb(struct request *rq)
-+{
-+ struct bfq_queue *bfqq = RQ_BFQQ(rq);
-+ struct bfq_data *bfqd = bfqq->bfqd;
-+ const int sync = rq_is_sync(rq);
-+
-+ BUG_ON(bfqq->queued[sync] == 0);
-+ bfqq->queued[sync]--;
-+ bfqd->queued--;
-+
-+ elv_rb_del(&bfqq->sort_list, rq);
-+
-+ if (RB_EMPTY_ROOT(&bfqq->sort_list)) {
-+ if (bfq_bfqq_busy(bfqq) && bfqq != bfqd->in_service_queue)
-+ bfq_del_bfqq_busy(bfqd, bfqq, 1);
-+ /*
-+ * Remove queue from request-position tree as it is empty.
-+ */
-+ if (bfqq->pos_root != NULL) {
-+ rb_erase(&bfqq->pos_node, bfqq->pos_root);
-+ bfqq->pos_root = NULL;
-+ }
-+ }
-+}
-+
-+/* see the definition of bfq_async_charge_factor for details */
-+static inline unsigned long bfq_serv_to_charge(struct request *rq,
-+ struct bfq_queue *bfqq)
-+{
-+ return blk_rq_sectors(rq) *
-+ (1 + ((!bfq_bfqq_sync(bfqq)) * (bfqq->raising_coeff == 1) *
-+ bfq_async_charge_factor));
-+}
-+
-+/**
-+ * bfq_updated_next_req - update the queue after a new next_rq selection.
-+ * @bfqd: the device data the queue belongs to.
-+ * @bfqq: the queue to update.
-+ *
-+ * If the first request of a queue changes we make sure that the queue
-+ * has enough budget to serve at least its first request (if the
-+ * request has grown). We do this because if the queue has not enough
-+ * budget for its first request, it has to go through two dispatch
-+ * rounds to actually get it dispatched.
-+ */
-+static void bfq_updated_next_req(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq)
-+{
-+ struct bfq_entity *entity = &bfqq->entity;
-+ struct bfq_service_tree *st = bfq_entity_service_tree(entity);
-+ struct request *next_rq = bfqq->next_rq;
-+ unsigned long new_budget;
-+
-+ if (next_rq == NULL)
-+ return;
-+
-+ if (bfqq == bfqd->in_service_queue)
-+ /*
-+ * In order not to break guarantees, budgets cannot be
-+ * changed after an entity has been selected.
-+ */
-+ return;
-+
-+ BUG_ON(entity->tree != &st->active);
-+ BUG_ON(entity == entity->sched_data->active_entity);
-+
-+ new_budget = max_t(unsigned long, bfqq->max_budget,
-+ bfq_serv_to_charge(next_rq, bfqq));
-+ entity->budget = new_budget;
-+ bfq_log_bfqq(bfqd, bfqq, "updated next rq: new budget %lu", new_budget);
-+ bfq_activate_bfqq(bfqd, bfqq);
-+}
-+
-+static inline unsigned int bfq_wrais_duration(struct bfq_data *bfqd)
-+{
-+ u64 dur;
-+
-+ if (bfqd->bfq_raising_max_time > 0)
-+ return bfqd->bfq_raising_max_time;
-+
-+ dur = bfqd->RT_prod;
-+ do_div(dur, bfqd->peak_rate);
-+
-+ return dur;
-+}
-+
-+static void bfq_add_rq_rb(struct request *rq)
-+{
-+ struct bfq_queue *bfqq = RQ_BFQQ(rq);
-+ struct bfq_entity *entity = &bfqq->entity;
-+ struct bfq_data *bfqd = bfqq->bfqd;
-+ struct request *next_rq, *prev;
-+ unsigned long old_raising_coeff = bfqq->raising_coeff;
-+ int idle_for_long_time = 0;
-+
-+ bfq_log_bfqq(bfqd, bfqq, "add_rq_rb %d", rq_is_sync(rq));
-+ bfqq->queued[rq_is_sync(rq)]++;
-+ bfqd->queued++;
-+
-+ elv_rb_add(&bfqq->sort_list, rq);
-+
-+ /*
-+ * Check if this request is a better next-serve candidate.
-+ */
-+ prev = bfqq->next_rq;
-+ next_rq = bfq_choose_req(bfqd, bfqq->next_rq, rq, bfqd->last_position);
-+ BUG_ON(next_rq == NULL);
-+ bfqq->next_rq = next_rq;
-+
-+ /*
-+ * Adjust priority tree position, if next_rq changes.
-+ */
-+ if (prev != bfqq->next_rq)
-+ bfq_rq_pos_tree_add(bfqd, bfqq);
-+
-+ if (!bfq_bfqq_busy(bfqq)) {
-+ int soft_rt = bfqd->bfq_raising_max_softrt_rate > 0 &&
-+ time_is_before_jiffies(bfqq->soft_rt_next_start);
-+ idle_for_long_time = time_is_before_jiffies(
-+ bfqq->budget_timeout +
-+ bfqd->bfq_raising_min_idle_time);
-+ entity->budget = max_t(unsigned long, bfqq->max_budget,
-+ bfq_serv_to_charge(next_rq, bfqq));
-+
-+ if (!bfqd->low_latency)
-+ goto add_bfqq_busy;
-+
-+ /*
-+ * If the queue is not being boosted and has been idle
-+ * for enough time, start a weight-raising period
-+ */
-+ if (old_raising_coeff == 1 &&
-+ (idle_for_long_time || soft_rt)) {
-+ bfqq->raising_coeff = bfqd->bfq_raising_coeff;
-+ if (idle_for_long_time)
-+ bfqq->raising_cur_max_time =
-+ bfq_wrais_duration(bfqd);
-+ else
-+ bfqq->raising_cur_max_time =
-+ bfqd->bfq_raising_rt_max_time;
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "wrais starting at %llu msec,"
-+ "rais_max_time %u",
-+ bfqq->last_rais_start_finish,
-+ jiffies_to_msecs(bfqq->
-+ raising_cur_max_time));
-+ } else if (old_raising_coeff > 1) {
-+ if (idle_for_long_time)
-+ bfqq->raising_cur_max_time =
-+ bfq_wrais_duration(bfqd);
-+ else if (bfqq->raising_cur_max_time ==
-+ bfqd->bfq_raising_rt_max_time &&
-+ !soft_rt) {
-+ bfqq->raising_coeff = 1;
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "wrais ending at %llu msec,"
-+ "rais_max_time %u",
-+ bfqq->last_rais_start_finish,
-+ jiffies_to_msecs(bfqq->
-+ raising_cur_max_time));
-+ } else if ((bfqq->last_rais_start_finish +
-+ bfqq->raising_cur_max_time <
-+ jiffies + bfqd->bfq_raising_rt_max_time) &&
-+ soft_rt) {
-+ /*
-+ *
-+ * The remaining weight-raising time is lower
-+ * than bfqd->bfq_raising_rt_max_time, which
-+ * means that the application is enjoying
-+ * weight raising either because deemed soft rt
-+ * in the near past, or because deemed
-+ * interactive a long ago. In both cases,
-+ * resetting now the current remaining weight-
-+ * raising time for the application to the
-+ * weight-raising duration for soft rt
-+ * applications would not cause any latency
-+ * increase for the application (as the new
-+ * duration would be higher than the remaining
-+ * time).
-+ *
-+ * In addition, the application is now meeting
-+ * the requirements for being deemed soft rt.
-+ * In the end we can correctly and safely
-+ * (re)charge the weight-raising duration for
-+ * the application with the weight-raising
-+ * duration for soft rt applications.
-+ *
-+ * In particular, doing this recharge now, i.e.,
-+ * before the weight-raising period for the
-+ * application finishes, reduces the probability
-+ * of the following negative scenario:
-+ * 1) the weight of a soft rt application is
-+ * raised at startup (as for any newly
-+ * created application),
-+ * 2) since the application is not interactive,
-+ * at a certain time weight-raising is
-+ * stopped for the application,
-+ * 3) at that time the application happens to
-+ * still have pending requests, and hence
-+ * is destined to not have a chance to be
-+ * deemed soft rt before these requests are
-+ * completed (see the comments to the
-+ * function bfq_bfqq_softrt_next_start()
-+ * for details on soft rt detection),
-+ * 4) these pending requests experience a high
-+ * latency because the application is not
-+ * weight-raised while they are pending.
-+ */
-+ bfqq->last_rais_start_finish = jiffies;
-+ bfqq->raising_cur_max_time =
-+ bfqd->bfq_raising_rt_max_time;
-+ }
-+ }
-+ if (old_raising_coeff != bfqq->raising_coeff)
-+ entity->ioprio_changed = 1;
-+add_bfqq_busy:
-+ bfqq->last_idle_bklogged = jiffies;
-+ bfqq->service_from_backlogged = 0;
-+ bfq_clear_bfqq_softrt_update(bfqq);
-+ bfq_add_bfqq_busy(bfqd, bfqq);
-+ } else {
-+ if (bfqd->low_latency && old_raising_coeff == 1 &&
-+ !rq_is_sync(rq) &&
-+ bfqq->last_rais_start_finish +
-+ time_is_before_jiffies(
-+ bfqd->bfq_raising_min_inter_arr_async)) {
-+ bfqq->raising_coeff = bfqd->bfq_raising_coeff;
-+ bfqq->raising_cur_max_time = bfq_wrais_duration(bfqd);
-+
-+ bfqd->raised_busy_queues++;
-+ entity->ioprio_changed = 1;
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "non-idle wrais starting at %llu msec,"
-+ "rais_max_time %u",
-+ bfqq->last_rais_start_finish,
-+ jiffies_to_msecs(bfqq->
-+ raising_cur_max_time));
-+ }
-+ bfq_updated_next_req(bfqd, bfqq);
-+ }
-+
-+ if (bfqd->low_latency &&
-+ (old_raising_coeff == 1 || bfqq->raising_coeff == 1 ||
-+ idle_for_long_time))
-+ bfqq->last_rais_start_finish = jiffies;
-+}
-+
-+static void bfq_reposition_rq_rb(struct bfq_queue *bfqq, struct request *rq)
-+{
-+ elv_rb_del(&bfqq->sort_list, rq);
-+ bfqq->queued[rq_is_sync(rq)]--;
-+ bfqq->bfqd->queued--;
-+ bfq_add_rq_rb(rq);
-+}
-+
-+static struct request *bfq_find_rq_fmerge(struct bfq_data *bfqd,
-+ struct bio *bio)
-+{
-+ struct task_struct *tsk = current;
-+ struct bfq_io_cq *bic;
-+ struct bfq_queue *bfqq;
-+
-+ bic = bfq_bic_lookup(bfqd, tsk->io_context);
-+ if (bic == NULL)
-+ return NULL;
-+
-+ bfqq = bic_to_bfqq(bic, bfq_bio_sync(bio));
-+ if (bfqq != NULL)
-+ return elv_rb_find(&bfqq->sort_list, bio_end_sector(bio));
-+
-+ return NULL;
-+}
-+
-+static void bfq_activate_request(struct request_queue *q, struct request *rq)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+
-+ bfqd->rq_in_driver++;
-+ bfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq);
-+ bfq_log(bfqd, "activate_request: new bfqd->last_position %llu",
-+ (long long unsigned)bfqd->last_position);
-+}
-+
-+static void bfq_deactivate_request(struct request_queue *q, struct request *rq)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+
-+ WARN_ON(bfqd->rq_in_driver == 0);
-+ bfqd->rq_in_driver--;
-+}
-+
-+static void bfq_remove_request(struct request *rq)
-+{
-+ struct bfq_queue *bfqq = RQ_BFQQ(rq);
-+ struct bfq_data *bfqd = bfqq->bfqd;
-+
-+ if (bfqq->next_rq == rq) {
-+ bfqq->next_rq = bfq_find_next_rq(bfqd, bfqq, rq);
-+ bfq_updated_next_req(bfqd, bfqq);
-+ }
-+
-+ list_del_init(&rq->queuelist);
-+ bfq_del_rq_rb(rq);
-+
-+ if (rq->cmd_flags & REQ_META) {
-+ WARN_ON(bfqq->meta_pending == 0);
-+ bfqq->meta_pending--;
-+ }
-+}
-+
-+static int bfq_merge(struct request_queue *q, struct request **req,
-+ struct bio *bio)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+ struct request *__rq;
-+
-+ __rq = bfq_find_rq_fmerge(bfqd, bio);
-+ if (__rq != NULL && elv_rq_merge_ok(__rq, bio)) {
-+ *req = __rq;
-+ return ELEVATOR_FRONT_MERGE;
-+ }
-+
-+ return ELEVATOR_NO_MERGE;
-+}
-+
-+static void bfq_merged_request(struct request_queue *q, struct request *req,
-+ int type)
-+{
-+ if (type == ELEVATOR_FRONT_MERGE) {
-+ struct bfq_queue *bfqq = RQ_BFQQ(req);
-+
-+ bfq_reposition_rq_rb(bfqq, req);
-+ }
-+}
-+
-+static void bfq_merged_requests(struct request_queue *q, struct request *rq,
-+ struct request *next)
-+{
-+ struct bfq_queue *bfqq = RQ_BFQQ(rq);
-+
-+ /*
-+ * Reposition in fifo if next is older than rq.
-+ */
-+ if (!list_empty(&rq->queuelist) && !list_empty(&next->queuelist) &&
-+ time_before(rq_fifo_time(next), rq_fifo_time(rq))) {
-+ list_move(&rq->queuelist, &next->queuelist);
-+ rq_set_fifo_time(rq, rq_fifo_time(next));
-+ }
-+
-+ if (bfqq->next_rq == next)
-+ bfqq->next_rq = rq;
-+
-+ bfq_remove_request(next);
-+}
-+
-+/* Must be called with bfqq != NULL */
-+static inline void bfq_bfqq_end_raising(struct bfq_queue *bfqq)
-+{
-+ BUG_ON(bfqq == NULL);
-+ if (bfq_bfqq_busy(bfqq))
-+ bfqq->bfqd->raised_busy_queues--;
-+ bfqq->raising_coeff = 1;
-+ bfqq->raising_cur_max_time = 0;
-+ /* Trigger a weight change on the next activation of the queue */
-+ bfqq->entity.ioprio_changed = 1;
-+}
-+
-+static void bfq_end_raising_async_queues(struct bfq_data *bfqd,
-+ struct bfq_group *bfqg)
-+{
-+ int i, j;
-+
-+ for (i = 0; i < 2; i++)
-+ for (j = 0; j < IOPRIO_BE_NR; j++)
-+ if (bfqg->async_bfqq[i][j] != NULL)
-+ bfq_bfqq_end_raising(bfqg->async_bfqq[i][j]);
-+ if (bfqg->async_idle_bfqq != NULL)
-+ bfq_bfqq_end_raising(bfqg->async_idle_bfqq);
-+}
-+
-+static void bfq_end_raising(struct bfq_data *bfqd)
-+{
-+ struct bfq_queue *bfqq;
-+
-+ spin_lock_irq(bfqd->queue->queue_lock);
-+
-+ list_for_each_entry(bfqq, &bfqd->active_list, bfqq_list)
-+ bfq_bfqq_end_raising(bfqq);
-+ list_for_each_entry(bfqq, &bfqd->idle_list, bfqq_list)
-+ bfq_bfqq_end_raising(bfqq);
-+ bfq_end_raising_async(bfqd);
-+
-+ spin_unlock_irq(bfqd->queue->queue_lock);
-+}
-+
-+static int bfq_allow_merge(struct request_queue *q, struct request *rq,
-+ struct bio *bio)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+ struct bfq_io_cq *bic;
-+ struct bfq_queue *bfqq;
-+
-+ /*
-+ * Disallow merge of a sync bio into an async request.
-+ */
-+ if (bfq_bio_sync(bio) && !rq_is_sync(rq))
-+ return 0;
-+
-+ /*
-+ * Lookup the bfqq that this bio will be queued with. Allow
-+ * merge only if rq is queued there.
-+ * Queue lock is held here.
-+ */
-+ bic = bfq_bic_lookup(bfqd, current->io_context);
-+ if (bic == NULL)
-+ return 0;
-+
-+ bfqq = bic_to_bfqq(bic, bfq_bio_sync(bio));
-+ return bfqq == RQ_BFQQ(rq);
-+}
-+
-+static void __bfq_set_in_service_queue(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq)
-+{
-+ if (bfqq != NULL) {
-+ bfq_mark_bfqq_must_alloc(bfqq);
-+ bfq_mark_bfqq_budget_new(bfqq);
-+ bfq_clear_bfqq_fifo_expire(bfqq);
-+
-+ bfqd->budgets_assigned = (bfqd->budgets_assigned*7 + 256) / 8;
-+
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "set_in_service_queue, cur-budget = %lu",
-+ bfqq->entity.budget);
-+ }
-+
-+ bfqd->in_service_queue = bfqq;
-+}
-+
-+/*
-+ * Get and set a new queue for service.
-+ */
-+static struct bfq_queue *bfq_set_in_service_queue(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq)
-+{
-+ if (!bfqq)
-+ bfqq = bfq_get_next_queue(bfqd);
-+ else
-+ bfq_get_next_queue_forced(bfqd, bfqq);
-+
-+ __bfq_set_in_service_queue(bfqd, bfqq);
-+ return bfqq;
-+}
-+
-+static inline sector_t bfq_dist_from_last(struct bfq_data *bfqd,
-+ struct request *rq)
-+{
-+ if (blk_rq_pos(rq) >= bfqd->last_position)
-+ return blk_rq_pos(rq) - bfqd->last_position;
-+ else
-+ return bfqd->last_position - blk_rq_pos(rq);
-+}
-+
-+/*
-+ * Return true if bfqq has no request pending and rq is close enough to
-+ * bfqd->last_position, or if rq is closer to bfqd->last_position than
-+ * bfqq->next_rq
-+ */
-+static inline int bfq_rq_close(struct bfq_data *bfqd, struct request *rq)
-+{
-+ return bfq_dist_from_last(bfqd, rq) <= BFQQ_SEEK_THR;
-+}
-+
-+static struct bfq_queue *bfqq_close(struct bfq_data *bfqd)
-+{
-+ struct rb_root *root = &bfqd->rq_pos_tree;
-+ struct rb_node *parent, *node;
-+ struct bfq_queue *__bfqq;
-+ sector_t sector = bfqd->last_position;
-+
-+ if (RB_EMPTY_ROOT(root))
-+ return NULL;
-+
-+ /*
-+ * First, if we find a request starting at the end of the last
-+ * request, choose it.
-+ */
-+ __bfqq = bfq_rq_pos_tree_lookup(bfqd, root, sector, &parent, NULL);
-+ if (__bfqq != NULL)
-+ return __bfqq;
-+
-+ /*
-+ * If the exact sector wasn't found, the parent of the NULL leaf
-+ * will contain the closest sector (rq_pos_tree sorted by next_request
-+ * position).
-+ */
-+ __bfqq = rb_entry(parent, struct bfq_queue, pos_node);
-+ if (bfq_rq_close(bfqd, __bfqq->next_rq))
-+ return __bfqq;
-+
-+ if (blk_rq_pos(__bfqq->next_rq) < sector)
-+ node = rb_next(&__bfqq->pos_node);
-+ else
-+ node = rb_prev(&__bfqq->pos_node);
-+ if (node == NULL)
-+ return NULL;
-+
-+ __bfqq = rb_entry(node, struct bfq_queue, pos_node);
-+ if (bfq_rq_close(bfqd, __bfqq->next_rq))
-+ return __bfqq;
-+
-+ return NULL;
-+}
-+
-+/*
-+ * bfqd - obvious
-+ * cur_bfqq - passed in so that we don't decide that the current queue
-+ * is closely cooperating with itself.
-+ *
-+ * We are assuming that cur_bfqq has dispatched at least one request,
-+ * and that bfqd->last_position reflects a position on the disk associated
-+ * with the I/O issued by cur_bfqq.
-+ */
-+static struct bfq_queue *bfq_close_cooperator(struct bfq_data *bfqd,
-+ struct bfq_queue *cur_bfqq)
-+{
-+ struct bfq_queue *bfqq;
-+
-+ if (bfq_class_idle(cur_bfqq))
-+ return NULL;
-+ if (!bfq_bfqq_sync(cur_bfqq))
-+ return NULL;
-+ if (BFQQ_SEEKY(cur_bfqq))
-+ return NULL;
-+
-+ /* If device has only one backlogged bfq_queue, don't search. */
-+ if (bfqd->busy_queues == 1)
-+ return NULL;
-+
-+ /*
-+ * We should notice if some of the queues are cooperating, e.g.
-+ * working closely on the same area of the disk. In that case,
-+ * we can group them together and don't waste time idling.
-+ */
-+ bfqq = bfqq_close(bfqd);
-+ if (bfqq == NULL || bfqq == cur_bfqq)
-+ return NULL;
-+
-+ /*
-+ * Do not merge queues from different bfq_groups.
-+ */
-+ if (bfqq->entity.parent != cur_bfqq->entity.parent)
-+ return NULL;
-+
-+ /*
-+ * It only makes sense to merge sync queues.
-+ */
-+ if (!bfq_bfqq_sync(bfqq))
-+ return NULL;
-+ if (BFQQ_SEEKY(bfqq))
-+ return NULL;
-+
-+ /*
-+ * Do not merge queues of different priority classes.
-+ */
-+ if (bfq_class_rt(bfqq) != bfq_class_rt(cur_bfqq))
-+ return NULL;
-+
-+ return bfqq;
-+}
-+
-+/*
-+ * If enough samples have been computed, return the current max budget
-+ * stored in bfqd, which is dynamically updated according to the
-+ * estimated disk peak rate; otherwise return the default max budget
-+ */
-+static inline unsigned long bfq_max_budget(struct bfq_data *bfqd)
-+{
-+ if (bfqd->budgets_assigned < 194)
-+ return bfq_default_max_budget;
-+ else
-+ return bfqd->bfq_max_budget;
-+}
-+
-+/*
-+ * Return min budget, which is a fraction of the current or default
-+ * max budget (trying with 1/32)
-+ */
-+static inline unsigned long bfq_min_budget(struct bfq_data *bfqd)
-+{
-+ if (bfqd->budgets_assigned < 194)
-+ return bfq_default_max_budget / 32;
-+ else
-+ return bfqd->bfq_max_budget / 32;
-+}
-+
-+/*
-+ * Decides whether idling should be done for given device and
-+ * given in-service queue.
-+ */
-+static inline bool bfq_queue_nonrot_noidle(struct bfq_data *bfqd,
-+ struct bfq_queue *in_service_bfqq)
-+{
-+ if (in_service_bfqq == NULL)
-+ return false;
-+ /*
-+ * If device is SSD it has no seek penalty, disable idling; but
-+ * do so only if:
-+ * - device does not support queuing, otherwise we still have
-+ * a problem with sync vs async workloads;
-+ * - the queue is not weight-raised, to preserve guarantees.
-+ */
-+ return (blk_queue_nonrot(bfqd->queue) && bfqd->hw_tag &&
-+ in_service_bfqq->raising_coeff == 1);
-+}
-+
-+static void bfq_arm_slice_timer(struct bfq_data *bfqd)
-+{
-+ struct bfq_queue *bfqq = bfqd->in_service_queue;
-+ struct bfq_io_cq *bic;
-+ unsigned long sl;
-+
-+ WARN_ON(!RB_EMPTY_ROOT(&bfqq->sort_list));
-+
-+ /* Tasks have exited, don't wait. */
-+ bic = bfqd->in_service_bic;
-+ if (bic == NULL || atomic_read(&bic->icq.ioc->active_ref) == 0)
-+ return;
-+
-+ bfq_mark_bfqq_wait_request(bfqq);
-+
-+ /*
-+ * We don't want to idle for seeks, but we do want to allow
-+ * fair distribution of slice time for a process doing back-to-back
-+ * seeks. So allow a little bit of time for him to submit a new rq.
-+ *
-+ * To prevent processes with (partly) seeky workloads from
-+ * being too ill-treated, grant them a small fraction of the
-+ * assigned budget before reducing the waiting time to
-+ * BFQ_MIN_TT. This happened to help reduce latency.
-+ */
-+ sl = bfqd->bfq_slice_idle;
-+ if (bfq_sample_valid(bfqq->seek_samples) && BFQQ_SEEKY(bfqq) &&
-+ bfqq->entity.service > bfq_max_budget(bfqd) / 8 &&
-+ bfqq->raising_coeff == 1)
-+ sl = min(sl, msecs_to_jiffies(BFQ_MIN_TT));
-+ else if (bfqq->raising_coeff > 1)
-+ sl = sl * 3;
-+ bfqd->last_idling_start = ktime_get();
-+ mod_timer(&bfqd->idle_slice_timer, jiffies + sl);
-+ bfq_log(bfqd, "arm idle: %u/%u ms",
-+ jiffies_to_msecs(sl), jiffies_to_msecs(bfqd->bfq_slice_idle));
-+}
-+
-+/*
-+ * Set the maximum time for the in-service queue to consume its
-+ * budget. This prevents seeky processes from lowering the disk
-+ * throughput (always guaranteed with a time slice scheme as in CFQ).
-+ */
-+static void bfq_set_budget_timeout(struct bfq_data *bfqd)
-+{
-+ struct bfq_queue *bfqq = bfqd->in_service_queue;
-+ unsigned int timeout_coeff;
-+ if (bfqq->raising_cur_max_time == bfqd->bfq_raising_rt_max_time)
-+ timeout_coeff = 1;
-+ else
-+ timeout_coeff = bfqq->entity.weight / bfqq->entity.orig_weight;
-+
-+ bfqd->last_budget_start = ktime_get();
-+
-+ bfq_clear_bfqq_budget_new(bfqq);
-+ bfqq->budget_timeout = jiffies +
-+ bfqd->bfq_timeout[bfq_bfqq_sync(bfqq)] * timeout_coeff;
-+
-+ bfq_log_bfqq(bfqd, bfqq, "set budget_timeout %u",
-+ jiffies_to_msecs(bfqd->bfq_timeout[bfq_bfqq_sync(bfqq)] *
-+ timeout_coeff));
-+}
-+
-+/*
-+ * Move request from internal lists to the request queue dispatch list.
-+ */
-+static void bfq_dispatch_insert(struct request_queue *q, struct request *rq)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+ struct bfq_queue *bfqq = RQ_BFQQ(rq);
-+
-+ bfq_remove_request(rq);
-+ bfqq->dispatched++;
-+ elv_dispatch_sort(q, rq);
-+
-+ if (bfq_bfqq_sync(bfqq))
-+ bfqd->sync_flight++;
-+}
-+
-+/*
-+ * Return expired entry, or NULL to just start from scratch in rbtree.
-+ */
-+static struct request *bfq_check_fifo(struct bfq_queue *bfqq)
-+{
-+ struct request *rq = NULL;
-+
-+ if (bfq_bfqq_fifo_expire(bfqq))
-+ return NULL;
-+
-+ bfq_mark_bfqq_fifo_expire(bfqq);
-+
-+ if (list_empty(&bfqq->fifo))
-+ return NULL;
-+
-+ rq = rq_entry_fifo(bfqq->fifo.next);
-+
-+ if (time_before(jiffies, rq_fifo_time(rq)))
-+ return NULL;
-+
-+ return rq;
-+}
-+
-+/*
-+ * Must be called with the queue_lock held.
-+ */
-+static int bfqq_process_refs(struct bfq_queue *bfqq)
-+{
-+ int process_refs, io_refs;
-+
-+ io_refs = bfqq->allocated[READ] + bfqq->allocated[WRITE];
-+ process_refs = atomic_read(&bfqq->ref) - io_refs - bfqq->entity.on_st;
-+ BUG_ON(process_refs < 0);
-+ return process_refs;
-+}
-+
-+static void bfq_setup_merge(struct bfq_queue *bfqq, struct bfq_queue *new_bfqq)
-+{
-+ int process_refs, new_process_refs;
-+ struct bfq_queue *__bfqq;
-+
-+ /*
-+ * If there are no process references on the new_bfqq, then it is
-+ * unsafe to follow the ->new_bfqq chain as other bfqq's in the chain
-+ * may have dropped their last reference (not just their last process
-+ * reference).
-+ */
-+ if (!bfqq_process_refs(new_bfqq))
-+ return;
-+
-+ /* Avoid a circular list and skip interim queue merges. */
-+ while ((__bfqq = new_bfqq->new_bfqq)) {
-+ if (__bfqq == bfqq)
-+ return;
-+ new_bfqq = __bfqq;
-+ }
-+
-+ process_refs = bfqq_process_refs(bfqq);
-+ new_process_refs = bfqq_process_refs(new_bfqq);
-+ /*
-+ * If the process for the bfqq has gone away, there is no
-+ * sense in merging the queues.
-+ */
-+ if (process_refs == 0 || new_process_refs == 0)
-+ return;
-+
-+ /*
-+ * Merge in the direction of the lesser amount of work.
-+ */
-+ if (new_process_refs >= process_refs) {
-+ bfqq->new_bfqq = new_bfqq;
-+ atomic_add(process_refs, &new_bfqq->ref);
-+ } else {
-+ new_bfqq->new_bfqq = bfqq;
-+ atomic_add(new_process_refs, &bfqq->ref);
-+ }
-+ bfq_log_bfqq(bfqq->bfqd, bfqq, "scheduling merge with queue %d",
-+ new_bfqq->pid);
-+}
-+
-+static inline unsigned long bfq_bfqq_budget_left(struct bfq_queue *bfqq)
-+{
-+ struct bfq_entity *entity = &bfqq->entity;
-+ return entity->budget - entity->service;
-+}
-+
-+static void __bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq)
-+{
-+ BUG_ON(bfqq != bfqd->in_service_queue);
-+
-+ __bfq_bfqd_reset_in_service(bfqd);
-+
-+ /*
-+ * If this bfqq is shared between multiple processes, check
-+ * to make sure that those processes are still issuing I/Os
-+ * within the mean seek distance. If not, it may be time to
-+ * break the queues apart again.
-+ */
-+ if (bfq_bfqq_coop(bfqq) && BFQQ_SEEKY(bfqq))
-+ bfq_mark_bfqq_split_coop(bfqq);
-+
-+ if (RB_EMPTY_ROOT(&bfqq->sort_list)) {
-+ /*
-+ * overloading budget_timeout field to store when
-+ * the queue remains with no backlog, used by
-+ * the weight-raising mechanism
-+ */
-+ bfqq->budget_timeout = jiffies;
-+ bfq_del_bfqq_busy(bfqd, bfqq, 1);
-+ } else {
-+ bfq_activate_bfqq(bfqd, bfqq);
-+ /*
-+ * Resort priority tree of potential close cooperators.
-+ */
-+ bfq_rq_pos_tree_add(bfqd, bfqq);
-+ }
-+}
-+
-+/**
-+ * __bfq_bfqq_recalc_budget - try to adapt the budget to the @bfqq behavior.
-+ * @bfqd: device data.
-+ * @bfqq: queue to update.
-+ * @reason: reason for expiration.
-+ *
-+ * Handle the feedback on @bfqq budget. See the body for detailed
-+ * comments.
-+ */
-+static void __bfq_bfqq_recalc_budget(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq,
-+ enum bfqq_expiration reason)
-+{
-+ struct request *next_rq;
-+ unsigned long budget, min_budget;
-+
-+ budget = bfqq->max_budget;
-+ min_budget = bfq_min_budget(bfqd);
-+
-+ BUG_ON(bfqq != bfqd->in_service_queue);
-+
-+ bfq_log_bfqq(bfqd, bfqq, "recalc_budg: last budg %lu, budg left %lu",
-+ bfqq->entity.budget, bfq_bfqq_budget_left(bfqq));
-+ bfq_log_bfqq(bfqd, bfqq, "recalc_budg: last max_budg %lu, min budg %lu",
-+ budget, bfq_min_budget(bfqd));
-+ bfq_log_bfqq(bfqd, bfqq, "recalc_budg: sync %d, seeky %d",
-+ bfq_bfqq_sync(bfqq), BFQQ_SEEKY(bfqd->in_service_queue));
-+
-+ if (bfq_bfqq_sync(bfqq)) {
-+ switch (reason) {
-+ /*
-+ * Caveat: in all the following cases we trade latency
-+ * for throughput.
-+ */
-+ case BFQ_BFQQ_TOO_IDLE:
-+ /*
-+ * This is the only case where we may reduce
-+ * the budget: if there is no requets of the
-+ * process still waiting for completion, then
-+ * we assume (tentatively) that the timer has
-+ * expired because the batch of requests of
-+ * the process could have been served with a
-+ * smaller budget. Hence, betting that
-+ * process will behave in the same way when it
-+ * becomes backlogged again, we reduce its
-+ * next budget. As long as we guess right,
-+ * this budget cut reduces the latency
-+ * experienced by the process.
-+ *
-+ * However, if there are still outstanding
-+ * requests, then the process may have not yet
-+ * issued its next request just because it is
-+ * still waiting for the completion of some of
-+ * the still oustanding ones. So in this
-+ * subcase we do not reduce its budget, on the
-+ * contrary we increase it to possibly boost
-+ * the throughput, as discussed in the
-+ * comments to the BUDGET_TIMEOUT case.
-+ */
-+ if (bfqq->dispatched > 0) /* still oustanding reqs */
-+ budget = min(budget * 2, bfqd->bfq_max_budget);
-+ else {
-+ if (budget > 5 * min_budget)
-+ budget -= 4 * min_budget;
-+ else
-+ budget = min_budget;
-+ }
-+ break;
-+ case BFQ_BFQQ_BUDGET_TIMEOUT:
-+ /*
-+ * We double the budget here because: 1) it
-+ * gives the chance to boost the throughput if
-+ * this is not a seeky process (which may have
-+ * bumped into this timeout because of, e.g.,
-+ * ZBR), 2) together with charge_full_budget
-+ * it helps give seeky processes higher
-+ * timestamps, and hence be served less
-+ * frequently.
-+ */
-+ budget = min(budget * 2, bfqd->bfq_max_budget);
-+ break;
-+ case BFQ_BFQQ_BUDGET_EXHAUSTED:
-+ /*
-+ * The process still has backlog, and did not
-+ * let either the budget timeout or the disk
-+ * idling timeout expire. Hence it is not
-+ * seeky, has a short thinktime and may be
-+ * happy with a higher budget too. So
-+ * definitely increase the budget of this good
-+ * candidate to boost the disk throughput.
-+ */
-+ budget = min(budget * 4, bfqd->bfq_max_budget);
-+ break;
-+ case BFQ_BFQQ_NO_MORE_REQUESTS:
-+ /*
-+ * Leave the budget unchanged.
-+ */
-+ default:
-+ return;
-+ }
-+ } else /* async queue */
-+ /* async queues get always the maximum possible budget
-+ * (their ability to dispatch is limited by
-+ * @bfqd->bfq_max_budget_async_rq).
-+ */
-+ budget = bfqd->bfq_max_budget;
-+
-+ bfqq->max_budget = budget;
-+
-+ if (bfqd->budgets_assigned >= 194 && bfqd->bfq_user_max_budget == 0 &&
-+ bfqq->max_budget > bfqd->bfq_max_budget)
-+ bfqq->max_budget = bfqd->bfq_max_budget;
-+
-+ /*
-+ * Make sure that we have enough budget for the next request.
-+ * Since the finish time of the bfqq must be kept in sync with
-+ * the budget, be sure to call __bfq_bfqq_expire() after the
-+ * update.
-+ */
-+ next_rq = bfqq->next_rq;
-+ if (next_rq != NULL)
-+ bfqq->entity.budget = max_t(unsigned long, bfqq->max_budget,
-+ bfq_serv_to_charge(next_rq, bfqq));
-+ else
-+ bfqq->entity.budget = bfqq->max_budget;
-+
-+ bfq_log_bfqq(bfqd, bfqq, "head sect: %u, new budget %lu",
-+ next_rq != NULL ? blk_rq_sectors(next_rq) : 0,
-+ bfqq->entity.budget);
-+}
-+
-+static unsigned long bfq_calc_max_budget(u64 peak_rate, u64 timeout)
-+{
-+ unsigned long max_budget;
-+
-+ /*
-+ * The max_budget calculated when autotuning is equal to the
-+ * amount of sectors transfered in timeout_sync at the
-+ * estimated peak rate.
-+ */
-+ max_budget = (unsigned long)(peak_rate * 1000 *
-+ timeout >> BFQ_RATE_SHIFT);
-+
-+ return max_budget;
-+}
-+
-+/*
-+ * In addition to updating the peak rate, checks whether the process
-+ * is "slow", and returns 1 if so. This slow flag is used, in addition
-+ * to the budget timeout, to reduce the amount of service provided to
-+ * seeky processes, and hence reduce their chances to lower the
-+ * throughput. See the code for more details.
-+ */
-+static int bfq_update_peak_rate(struct bfq_data *bfqd, struct bfq_queue *bfqq,
-+ int compensate, enum bfqq_expiration reason)
-+{
-+ u64 bw, usecs, expected, timeout;
-+ ktime_t delta;
-+ int update = 0;
-+
-+ if (!bfq_bfqq_sync(bfqq) || bfq_bfqq_budget_new(bfqq))
-+ return 0;
-+
-+ if (compensate)
-+ delta = bfqd->last_idling_start;
-+ else
-+ delta = ktime_get();
-+ delta = ktime_sub(delta, bfqd->last_budget_start);
-+ usecs = ktime_to_us(delta);
-+
-+ /* Don't trust short/unrealistic values. */
-+ if (usecs < 100 || usecs >= LONG_MAX)
-+ return 0;
-+
-+ /*
-+ * Calculate the bandwidth for the last slice. We use a 64 bit
-+ * value to store the peak rate, in sectors per usec in fixed
-+ * point math. We do so to have enough precision in the estimate
-+ * and to avoid overflows.
-+ */
-+ bw = (u64)bfqq->entity.service << BFQ_RATE_SHIFT;
-+ do_div(bw, (unsigned long)usecs);
-+
-+ timeout = jiffies_to_msecs(bfqd->bfq_timeout[BLK_RW_SYNC]);
-+
-+ /*
-+ * Use only long (> 20ms) intervals to filter out spikes for
-+ * the peak rate estimation.
-+ */
-+ if (usecs > 20000) {
-+ if (bw > bfqd->peak_rate ||
-+ (!BFQQ_SEEKY(bfqq) &&
-+ reason == BFQ_BFQQ_BUDGET_TIMEOUT)) {
-+ bfq_log(bfqd, "measured bw =%llu", bw);
-+ /*
-+ * To smooth oscillations use a low-pass filter with
-+ * alpha=7/8, i.e.,
-+ * new_rate = (7/8) * old_rate + (1/8) * bw
-+ */
-+ do_div(bw, 8);
-+ if (bw == 0)
-+ return 0;
-+ bfqd->peak_rate *= 7;
-+ do_div(bfqd->peak_rate, 8);
-+ bfqd->peak_rate += bw;
-+ update = 1;
-+ bfq_log(bfqd, "new peak_rate=%llu", bfqd->peak_rate);
-+ }
-+
-+ update |= bfqd->peak_rate_samples == BFQ_PEAK_RATE_SAMPLES - 1;
-+
-+ if (bfqd->peak_rate_samples < BFQ_PEAK_RATE_SAMPLES)
-+ bfqd->peak_rate_samples++;
-+
-+ if (bfqd->peak_rate_samples == BFQ_PEAK_RATE_SAMPLES &&
-+ update && bfqd->bfq_user_max_budget == 0) {
-+ bfqd->bfq_max_budget =
-+ bfq_calc_max_budget(bfqd->peak_rate, timeout);
-+ bfq_log(bfqd, "new max_budget=%lu",
-+ bfqd->bfq_max_budget);
-+ }
-+ }
-+
-+ /*
-+ * If the process has been served for a too short time
-+ * interval to let its possible sequential accesses prevail on
-+ * the initial seek time needed to move the disk head on the
-+ * first sector it requested, then give the process a chance
-+ * and for the moment return false.
-+ */
-+ if (bfqq->entity.budget <= bfq_max_budget(bfqd) / 8)
-+ return 0;
-+
-+ /*
-+ * A process is considered ``slow'' (i.e., seeky, so that we
-+ * cannot treat it fairly in the service domain, as it would
-+ * slow down too much the other processes) if, when a slice
-+ * ends for whatever reason, it has received service at a
-+ * rate that would not be high enough to complete the budget
-+ * before the budget timeout expiration.
-+ */
-+ expected = bw * 1000 * timeout >> BFQ_RATE_SHIFT;
-+
-+ /*
-+ * Caveat: processes doing IO in the slower disk zones will
-+ * tend to be slow(er) even if not seeky. And the estimated
-+ * peak rate will actually be an average over the disk
-+ * surface. Hence, to not be too harsh with unlucky processes,
-+ * we keep a budget/3 margin of safety before declaring a
-+ * process slow.
-+ */
-+ return expected > (4 * bfqq->entity.budget) / 3;
-+}
-+
-+/*
-+ * To be deemed as soft real-time, an application must meet two requirements.
-+ * The first is that the application must not require an average bandwidth
-+ * higher than the approximate bandwidth required to playback or record a
-+ * compressed high-definition video.
-+ * The next function is invoked on the completion of the last request of a
-+ * batch, to compute the next-start time instant, soft_rt_next_start, such
-+ * that, if the next request of the application does not arrive before
-+ * soft_rt_next_start, then the above requirement on the bandwidth is met.
-+ *
-+ * The second requirement is that the request pattern of the application is
-+ * isochronous, i.e., that, after issuing a request or a batch of requests, the
-+ * application stops for a while, then issues a new batch, and so on. For this
-+ * reason the next function is invoked to compute soft_rt_next_start only for
-+ * applications that meet this requirement, whereas soft_rt_next_start is set
-+ * to infinity for applications that do not.
-+ *
-+ * Unfortunately, even a greedy application may happen to behave in an
-+ * isochronous way if several processes are competing for the CPUs. In fact,
-+ * in this scenario the application stops issuing requests while the CPUs are
-+ * busy serving other processes, then restarts, then stops again for a while,
-+ * and so on. In addition, if the disk achieves a low enough throughput with
-+ * the request pattern issued by the application, then the above bandwidth
-+ * requirement may happen to be met too. To prevent such a greedy application
-+ * to be deemed as soft real-time, a further rule is used in the computation
-+ * of soft_rt_next_start: soft_rt_next_start must be higher than the current
-+ * time plus the maximum time for which the arrival of a request is waited
-+ * for when a sync queue becomes idle, namely bfqd->bfq_slice_idle. This
-+ * filters out greedy applications, as the latter issue instead their next
-+ * request as soon as possible after the last one has been completed (in
-+ * contrast, when a batch of requests is completed, a soft real-time
-+ * application spends some time processing data).
-+ *
-+ * Actually, the last filter may easily generate false positives if: only
-+ * bfqd->bfq_slice_idle is used as a reference time interval, and one or
-+ * both the following two cases occur:
-+ * 1) HZ is so low that the duration of a jiffie is comparable to or higher
-+ * than bfqd->bfq_slice_idle. This happens, e.g., on slow devices with
-+ * HZ=100.
-+ * 2) jiffies, instead of increasing at a constant rate, may stop increasing
-+ * for a while, then suddenly 'jump' by several units to recover the lost
-+ * increments. This seems to happen, e.g., inside virtual machines.
-+ * To address this issue, we do not use as a reference time interval just
-+ * bfqd->bfq_slice_idle, but bfqd->bfq_slice_idle plus a few jiffies. In
-+ * particular we add the minimum number of jiffies for which the filter seems
-+ * to be quite precise also in embedded systems and KVM/QEMU virtual machines.
-+ */
-+static inline u64 bfq_bfqq_softrt_next_start(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq)
-+{
-+ return max(bfqq->last_idle_bklogged +
-+ HZ * bfqq->service_from_backlogged /
-+ bfqd->bfq_raising_max_softrt_rate,
-+ (u64)jiffies + bfqq->bfqd->bfq_slice_idle + 4);
-+}
-+
-+/**
-+ * bfq_bfqq_expire - expire a queue.
-+ * @bfqd: device owning the queue.
-+ * @bfqq: the queue to expire.
-+ * @compensate: if true, compensate for the time spent idling.
-+ * @reason: the reason causing the expiration.
-+ *
-+ *
-+ * If the process associated to the queue is slow (i.e., seeky), or in
-+ * case of budget timeout, or, finally, if it is async, we
-+ * artificially charge it an entire budget (independently of the
-+ * actual service it received). As a consequence, the queue will get
-+ * higher timestamps than the correct ones upon reactivation, and
-+ * hence it will be rescheduled as if it had received more service
-+ * than what it actually received. In the end, this class of processes
-+ * will receive less service in proportion to how slowly they consume
-+ * their budgets (and hence how seriously they tend to lower the
-+ * throughput).
-+ *
-+ * In contrast, when a queue expires because it has been idling for
-+ * too much or because it exhausted its budget, we do not touch the
-+ * amount of service it has received. Hence when the queue will be
-+ * reactivated and its timestamps updated, the latter will be in sync
-+ * with the actual service received by the queue until expiration.
-+ *
-+ * Charging a full budget to the first type of queues and the exact
-+ * service to the others has the effect of using the WF2Q+ policy to
-+ * schedule the former on a timeslice basis, without violating the
-+ * service domain guarantees of the latter.
-+ */
-+static void bfq_bfqq_expire(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq,
-+ int compensate,
-+ enum bfqq_expiration reason)
-+{
-+ int slow;
-+ BUG_ON(bfqq != bfqd->in_service_queue);
-+
-+ /* Update disk peak rate for autotuning and check whether the
-+ * process is slow (see bfq_update_peak_rate).
-+ */
-+ slow = bfq_update_peak_rate(bfqd, bfqq, compensate, reason);
-+
-+ /*
-+ * As above explained, 'punish' slow (i.e., seeky), timed-out
-+ * and async queues, to favor sequential sync workloads.
-+ *
-+ * Processes doing IO in the slower disk zones will tend to be
-+ * slow(er) even if not seeky. Hence, since the estimated peak
-+ * rate is actually an average over the disk surface, these
-+ * processes may timeout just for bad luck. To avoid punishing
-+ * them we do not charge a full budget to a process that
-+ * succeeded in consuming at least 2/3 of its budget.
-+ */
-+ if (slow || (reason == BFQ_BFQQ_BUDGET_TIMEOUT &&
-+ bfq_bfqq_budget_left(bfqq) >= bfqq->entity.budget / 3))
-+ bfq_bfqq_charge_full_budget(bfqq);
-+
-+ bfqq->service_from_backlogged += bfqq->entity.service;
-+
-+ if (bfqd->low_latency && bfqq->raising_coeff == 1)
-+ bfqq->last_rais_start_finish = jiffies;
-+
-+ if (bfqd->low_latency && bfqd->bfq_raising_max_softrt_rate > 0) {
-+ if (reason != BFQ_BFQQ_BUDGET_TIMEOUT &&
-+ reason != BFQ_BFQQ_BUDGET_EXHAUSTED) {
-+ /*
-+ * If we get here, then the request pattern is
-+ * isochronous (see the comments to the function
-+ * bfq_bfqq_softrt_next_start()). However, if the
-+ * queue still has in-flight requests, then it is
-+ * better to postpone the computation of next_start
-+ * to the next request completion. In fact, if we
-+ * computed it now, then the application might pass
-+ * the greedy-application filter improperly, because
-+ * the arrival of its next request may happen to be
-+ * higher than (jiffies + bfqq->bfqd->bfq_slice_idle)
-+ * not because the application is truly soft real-
-+ * time, but just because the application is currently
-+ * waiting for the completion of some request before
-+ * issuing, as quickly as possible, its next request.
-+ */
-+ if (bfqq->dispatched > 0) {
-+ bfqq->soft_rt_next_start = -1;
-+ bfq_mark_bfqq_softrt_update(bfqq);
-+ } else
-+ bfqq->soft_rt_next_start =
-+ bfq_bfqq_softrt_next_start(bfqd, bfqq);
-+ } else
-+ bfqq->soft_rt_next_start = -1; /* infinity */
-+ }
-+
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "expire (%d, slow %d, num_disp %d, idle_win %d)", reason, slow,
-+ bfqq->dispatched, bfq_bfqq_idle_window(bfqq));
-+
-+ /* Increase, decrease or leave budget unchanged according to reason */
-+ __bfq_bfqq_recalc_budget(bfqd, bfqq, reason);
-+ __bfq_bfqq_expire(bfqd, bfqq);
-+}
-+
-+/*
-+ * Budget timeout is not implemented through a dedicated timer, but
-+ * just checked on request arrivals and completions, as well as on
-+ * idle timer expirations.
-+ */
-+static int bfq_bfqq_budget_timeout(struct bfq_queue *bfqq)
-+{
-+ if (bfq_bfqq_budget_new(bfqq))
-+ return 0;
-+
-+ if (time_before(jiffies, bfqq->budget_timeout))
-+ return 0;
-+
-+ return 1;
-+}
-+
-+/*
-+ * If we expire a queue that is waiting for the arrival of a new
-+ * request, we may prevent the fictitious timestamp backshifting that
-+ * allows the guarantees of the queue to be preserved (see [1] for
-+ * this tricky aspect). Hence we return true only if this condition
-+ * does not hold, or if the queue is slow enough to deserve only to be
-+ * kicked off for preserving a high throughput.
-+*/
-+static inline int bfq_may_expire_for_budg_timeout(struct bfq_queue *bfqq)
-+{
-+ bfq_log_bfqq(bfqq->bfqd, bfqq,
-+ "may_budget_timeout: wr %d left %d timeout %d",
-+ bfq_bfqq_wait_request(bfqq),
-+ bfq_bfqq_budget_left(bfqq) >= bfqq->entity.budget / 3,
-+ bfq_bfqq_budget_timeout(bfqq));
-+
-+ return (!bfq_bfqq_wait_request(bfqq) ||
-+ bfq_bfqq_budget_left(bfqq) >= bfqq->entity.budget / 3)
-+ &&
-+ bfq_bfqq_budget_timeout(bfqq);
-+}
-+
-+/*
-+ * For weight-raised queues issuing sync requests, idling is always performed,
-+ * as this is instrumental in guaranteeing a high fraction of the throughput
-+ * to these queues, and hence in guaranteeing a lower latency for their
-+ * requests. See [1] for details.
-+ *
-+ * For non-weight-raised queues, idling is instead disabled if the device is
-+ * NCQ-enabled and non-rotational, as this boosts the throughput on such
-+ * devices.
-+ */
-+static inline bool bfq_bfqq_must_not_expire(struct bfq_queue *bfqq)
-+{
-+ struct bfq_data *bfqd = bfqq->bfqd;
-+
-+ return bfq_bfqq_sync(bfqq) && (
-+ bfqq->raising_coeff > 1 ||
-+ (bfq_bfqq_idle_window(bfqq) &&
-+ !(bfqd->hw_tag &&
-+ (blk_queue_nonrot(bfqd->queue) ||
-+ /*
-+ * If there are weight-raised busy queues, then do not idle
-+ * the disk for a sync non-weight-raised queue, and hence
-+ * expire the queue immediately if empty. Combined with the
-+ * timestamping rules of BFQ (see [1] for details), this
-+ * causes sync non-weight-raised queues to get a lower
-+ * fraction of the disk throughput, and hence reduces the rate
-+ * at which the processes associated to these queues ask for
-+ * requests from the request pool.
-+ *
-+ * This is beneficial for weight-raised processes, when the
-+ * system operates in request-pool saturation conditions
-+ * (e.g., in the presence of write hogs). In fact, if
-+ * non-weight-raised processes ask for requests at a lower
-+ * rate, then weight-raised processes have a higher
-+ * probability to get a request from the pool immediately
-+ * (or at least soon) when they need one. Hence they have a
-+ * higher probability to actually get a fraction of the disk
-+ * throughput proportional to their high weight. This is
-+ * especially true with NCQ-enabled drives, which enqueue
-+ * several requests in advance and further reorder
-+ * internally-queued requests.
-+ *
-+ * Mistreating non-weight-raised queues in the above-described
-+ * way, when there are busy weight-raised queues, seems to
-+ * mitigate starvation problems in the presence of heavy write
-+ * workloads and NCQ, and hence to guarantee a higher
-+ * application and system responsiveness in these hostile
-+ * scenarios.
-+ */
-+ bfqd->raised_busy_queues > 0)
-+ )
-+ )
-+ );
-+}
-+
-+/*
-+ * If the in-service queue is empty, but it is sync and either of the following
-+ * conditions holds, then: 1) the queue must remain in service and cannot be
-+ * expired, and 2) the disk must be idled to wait for the possible arrival
-+ * of a new request for the queue. The conditions are:
-+ * - the device is rotational and not performing NCQ, and the queue has its
-+ * idle window set (in this case, waiting for a new request for the queue
-+ * is likely to boost the disk throughput);
-+ * - the queue is weight-raised (waiting for the request is necessary to
-+ * provide the queue with fairness and latency guarantees, see [1] for
-+ * details).
-+ */
-+static inline bool bfq_bfqq_must_idle(struct bfq_queue *bfqq)
-+{
-+ struct bfq_data *bfqd = bfqq->bfqd;
-+
-+ return (RB_EMPTY_ROOT(&bfqq->sort_list) && bfqd->bfq_slice_idle != 0 &&
-+ bfq_bfqq_must_not_expire(bfqq) &&
-+ !bfq_queue_nonrot_noidle(bfqd, bfqq));
-+}
-+
-+/*
-+ * Select a queue for service. If we have a current queue in service,
-+ * check whether to continue servicing it, or retrieve and set a new one.
-+ */
-+static struct bfq_queue *bfq_select_queue(struct bfq_data *bfqd)
-+{
-+ struct bfq_queue *bfqq, *new_bfqq = NULL;
-+ struct request *next_rq;
-+ enum bfqq_expiration reason = BFQ_BFQQ_BUDGET_TIMEOUT;
-+
-+ bfqq = bfqd->in_service_queue;
-+ if (bfqq == NULL)
-+ goto new_queue;
-+
-+ bfq_log_bfqq(bfqd, bfqq, "select_queue: already in-service queue");
-+
-+ /*
-+ * If another queue has a request waiting within our mean seek
-+ * distance, let it run. The expire code will check for close
-+ * cooperators and put the close queue at the front of the
-+ * service tree. If possible, merge the expiring queue with the
-+ * new bfqq.
-+ */
-+ new_bfqq = bfq_close_cooperator(bfqd, bfqq);
-+ if (new_bfqq != NULL && bfqq->new_bfqq == NULL)
-+ bfq_setup_merge(bfqq, new_bfqq);
-+
-+ if (bfq_may_expire_for_budg_timeout(bfqq) &&
-+ !timer_pending(&bfqd->idle_slice_timer) &&
-+ !bfq_bfqq_must_idle(bfqq))
-+ goto expire;
-+
-+ next_rq = bfqq->next_rq;
-+ /*
-+ * If bfqq has requests queued and it has enough budget left to
-+ * serve them, keep the queue, otherwise expire it.
-+ */
-+ if (next_rq != NULL) {
-+ if (bfq_serv_to_charge(next_rq, bfqq) >
-+ bfq_bfqq_budget_left(bfqq)) {
-+ reason = BFQ_BFQQ_BUDGET_EXHAUSTED;
-+ goto expire;
-+ } else {
-+ /*
-+ * The idle timer may be pending because we may not
-+ * disable disk idling even when a new request arrives
-+ */
-+ if (timer_pending(&bfqd->idle_slice_timer)) {
-+ /*
-+ * If we get here: 1) at least a new request
-+ * has arrived but we have not disabled the
-+ * timer because the request was too small,
-+ * 2) then the block layer has unplugged the
-+ * device, causing the dispatch to be invoked.
-+ *
-+ * Since the device is unplugged, now the
-+ * requests are probably large enough to
-+ * provide a reasonable throughput.
-+ * So we disable idling.
-+ */
-+ bfq_clear_bfqq_wait_request(bfqq);
-+ del_timer(&bfqd->idle_slice_timer);
-+ }
-+ if (new_bfqq == NULL)
-+ goto keep_queue;
-+ else
-+ goto expire;
-+ }
-+ }
-+
-+ /*
-+ * No requests pending. If the in-service queue has no cooperator and
-+ * still has requests in flight (possibly waiting for a completion)
-+ * or is idling for a new request, then keep it.
-+ */
-+ if (new_bfqq == NULL && (timer_pending(&bfqd->idle_slice_timer) ||
-+ (bfqq->dispatched != 0 && bfq_bfqq_must_not_expire(bfqq)))) {
-+ bfqq = NULL;
-+ goto keep_queue;
-+ } else if (new_bfqq != NULL && timer_pending(&bfqd->idle_slice_timer)) {
-+ /*
-+ * Expiring the queue because there is a close cooperator,
-+ * cancel timer.
-+ */
-+ bfq_clear_bfqq_wait_request(bfqq);
-+ del_timer(&bfqd->idle_slice_timer);
-+ }
-+
-+ reason = BFQ_BFQQ_NO_MORE_REQUESTS;
-+expire:
-+ bfq_bfqq_expire(bfqd, bfqq, 0, reason);
-+new_queue:
-+ bfqq = bfq_set_in_service_queue(bfqd, new_bfqq);
-+ bfq_log(bfqd, "select_queue: new queue %d returned",
-+ bfqq != NULL ? bfqq->pid : 0);
-+keep_queue:
-+ return bfqq;
-+}
-+
-+static void bfq_update_raising_data(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq)
-+{
-+ if (bfqq->raising_coeff > 1) { /* queue is being boosted */
-+ struct bfq_entity *entity = &bfqq->entity;
-+
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "raising period dur %u/%u msec, "
-+ "old raising coeff %u, w %d(%d)",
-+ jiffies_to_msecs(jiffies -
-+ bfqq->last_rais_start_finish),
-+ jiffies_to_msecs(bfqq->raising_cur_max_time),
-+ bfqq->raising_coeff,
-+ bfqq->entity.weight, bfqq->entity.orig_weight);
-+
-+ BUG_ON(bfqq != bfqd->in_service_queue && entity->weight !=
-+ entity->orig_weight * bfqq->raising_coeff);
-+ if (entity->ioprio_changed)
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "WARN: pending prio change");
-+ /*
-+ * If too much time has elapsed from the beginning
-+ * of this weight-raising, stop it.
-+ */
-+ if (jiffies - bfqq->last_rais_start_finish >
-+ bfqq->raising_cur_max_time) {
-+ bfqq->last_rais_start_finish = jiffies;
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "wrais ending at %llu msec,"
-+ "rais_max_time %u",
-+ bfqq->last_rais_start_finish,
-+ jiffies_to_msecs(bfqq->
-+ raising_cur_max_time));
-+ bfq_bfqq_end_raising(bfqq);
-+ __bfq_entity_update_weight_prio(
-+ bfq_entity_service_tree(entity),
-+ entity);
-+ }
-+ }
-+}
-+
-+/*
-+ * Dispatch one request from bfqq, moving it to the request queue
-+ * dispatch list.
-+ */
-+static int bfq_dispatch_request(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq)
-+{
-+ int dispatched = 0;
-+ struct request *rq;
-+ unsigned long service_to_charge;
-+
-+ BUG_ON(RB_EMPTY_ROOT(&bfqq->sort_list));
-+
-+ /* Follow expired path, else get first next available. */
-+ rq = bfq_check_fifo(bfqq);
-+ if (rq == NULL)
-+ rq = bfqq->next_rq;
-+ service_to_charge = bfq_serv_to_charge(rq, bfqq);
-+
-+ if (service_to_charge > bfq_bfqq_budget_left(bfqq)) {
-+ /*
-+ * This may happen if the next rq is chosen
-+ * in fifo order instead of sector order.
-+ * The budget is properly dimensioned
-+ * to be always sufficient to serve the next request
-+ * only if it is chosen in sector order. The reason is
-+ * that it would be quite inefficient and little useful
-+ * to always make sure that the budget is large enough
-+ * to serve even the possible next rq in fifo order.
-+ * In fact, requests are seldom served in fifo order.
-+ *
-+ * Expire the queue for budget exhaustion, and
-+ * make sure that the next act_budget is enough
-+ * to serve the next request, even if it comes
-+ * from the fifo expired path.
-+ */
-+ bfqq->next_rq = rq;
-+ /*
-+ * Since this dispatch is failed, make sure that
-+ * a new one will be performed
-+ */
-+ if (!bfqd->rq_in_driver)
-+ bfq_schedule_dispatch(bfqd);
-+ goto expire;
-+ }
-+
-+ /* Finally, insert request into driver dispatch list. */
-+ bfq_bfqq_served(bfqq, service_to_charge);
-+ bfq_dispatch_insert(bfqd->queue, rq);
-+
-+ bfq_update_raising_data(bfqd, bfqq);
-+
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "dispatched %u sec req (%llu), budg left %lu",
-+ blk_rq_sectors(rq),
-+ (long long unsigned)blk_rq_pos(rq),
-+ bfq_bfqq_budget_left(bfqq));
-+
-+ dispatched++;
-+
-+ if (bfqd->in_service_bic == NULL) {
-+ atomic_long_inc(&RQ_BIC(rq)->icq.ioc->refcount);
-+ bfqd->in_service_bic = RQ_BIC(rq);
-+ }
-+
-+ if (bfqd->busy_queues > 1 && ((!bfq_bfqq_sync(bfqq) &&
-+ dispatched >= bfqd->bfq_max_budget_async_rq) ||
-+ bfq_class_idle(bfqq)))
-+ goto expire;
-+
-+ return dispatched;
-+
-+expire:
-+ bfq_bfqq_expire(bfqd, bfqq, 0, BFQ_BFQQ_BUDGET_EXHAUSTED);
-+ return dispatched;
-+}
-+
-+static int __bfq_forced_dispatch_bfqq(struct bfq_queue *bfqq)
-+{
-+ int dispatched = 0;
-+
-+ while (bfqq->next_rq != NULL) {
-+ bfq_dispatch_insert(bfqq->bfqd->queue, bfqq->next_rq);
-+ dispatched++;
-+ }
-+
-+ BUG_ON(!list_empty(&bfqq->fifo));
-+ return dispatched;
-+}
-+
-+/*
-+ * Drain our current requests. Used for barriers and when switching
-+ * io schedulers on-the-fly.
-+ */
-+static int bfq_forced_dispatch(struct bfq_data *bfqd)
-+{
-+ struct bfq_queue *bfqq, *n;
-+ struct bfq_service_tree *st;
-+ int dispatched = 0;
-+
-+ bfqq = bfqd->in_service_queue;
-+ if (bfqq != NULL)
-+ __bfq_bfqq_expire(bfqd, bfqq);
-+
-+ /*
-+ * Loop through classes, and be careful to leave the scheduler
-+ * in a consistent state, as feedback mechanisms and vtime
-+ * updates cannot be disabled during the process.
-+ */
-+ list_for_each_entry_safe(bfqq, n, &bfqd->active_list, bfqq_list) {
-+ st = bfq_entity_service_tree(&bfqq->entity);
-+
-+ dispatched += __bfq_forced_dispatch_bfqq(bfqq);
-+ bfqq->max_budget = bfq_max_budget(bfqd);
-+
-+ bfq_forget_idle(st);
-+ }
-+
-+ BUG_ON(bfqd->busy_queues != 0);
-+
-+ return dispatched;
-+}
-+
-+static int bfq_dispatch_requests(struct request_queue *q, int force)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+ struct bfq_queue *bfqq;
-+ int max_dispatch;
-+
-+ bfq_log(bfqd, "dispatch requests: %d busy queues", bfqd->busy_queues);
-+ if (bfqd->busy_queues == 0)
-+ return 0;
-+
-+ if (unlikely(force))
-+ return bfq_forced_dispatch(bfqd);
-+
-+ bfqq = bfq_select_queue(bfqd);
-+ if (bfqq == NULL)
-+ return 0;
-+
-+ max_dispatch = bfqd->bfq_quantum;
-+ if (bfq_class_idle(bfqq))
-+ max_dispatch = 1;
-+
-+ if (!bfq_bfqq_sync(bfqq))
-+ max_dispatch = bfqd->bfq_max_budget_async_rq;
-+
-+ if (bfqq->dispatched >= max_dispatch) {
-+ if (bfqd->busy_queues > 1)
-+ return 0;
-+ if (bfqq->dispatched >= 4 * max_dispatch)
-+ return 0;
-+ }
-+
-+ if (bfqd->sync_flight != 0 && !bfq_bfqq_sync(bfqq))
-+ return 0;
-+
-+ bfq_clear_bfqq_wait_request(bfqq);
-+ BUG_ON(timer_pending(&bfqd->idle_slice_timer));
-+
-+ if (!bfq_dispatch_request(bfqd, bfqq))
-+ return 0;
-+
-+ bfq_log_bfqq(bfqd, bfqq, "dispatched one request of %d (max_disp %d)",
-+ bfqq->pid, max_dispatch);
-+
-+ return 1;
-+}
-+
-+/*
-+ * Task holds one reference to the queue, dropped when task exits. Each rq
-+ * in-flight on this queue also holds a reference, dropped when rq is freed.
-+ *
-+ * Queue lock must be held here.
-+ */
-+static void bfq_put_queue(struct bfq_queue *bfqq)
-+{
-+ struct bfq_data *bfqd = bfqq->bfqd;
-+
-+ BUG_ON(atomic_read(&bfqq->ref) <= 0);
-+
-+ bfq_log_bfqq(bfqd, bfqq, "put_queue: %p %d", bfqq,
-+ atomic_read(&bfqq->ref));
-+ if (!atomic_dec_and_test(&bfqq->ref))
-+ return;
-+
-+ BUG_ON(rb_first(&bfqq->sort_list) != NULL);
-+ BUG_ON(bfqq->allocated[READ] + bfqq->allocated[WRITE] != 0);
-+ BUG_ON(bfqq->entity.tree != NULL);
-+ BUG_ON(bfq_bfqq_busy(bfqq));
-+ BUG_ON(bfqd->in_service_queue == bfqq);
-+
-+ bfq_log_bfqq(bfqd, bfqq, "put_queue: %p freed", bfqq);
-+
-+ kmem_cache_free(bfq_pool, bfqq);
-+}
-+
-+static void bfq_put_cooperator(struct bfq_queue *bfqq)
-+{
-+ struct bfq_queue *__bfqq, *next;
-+
-+ /*
-+ * If this queue was scheduled to merge with another queue, be
-+ * sure to drop the reference taken on that queue (and others in
-+ * the merge chain). See bfq_setup_merge and bfq_merge_bfqqs.
-+ */
-+ __bfqq = bfqq->new_bfqq;
-+ while (__bfqq) {
-+ if (__bfqq == bfqq) {
-+ WARN(1, "bfqq->new_bfqq loop detected.\n");
-+ break;
-+ }
-+ next = __bfqq->new_bfqq;
-+ bfq_put_queue(__bfqq);
-+ __bfqq = next;
-+ }
-+}
-+
-+static void bfq_exit_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq)
-+{
-+ if (bfqq == bfqd->in_service_queue) {
-+ __bfq_bfqq_expire(bfqd, bfqq);
-+ bfq_schedule_dispatch(bfqd);
-+ }
-+
-+ bfq_log_bfqq(bfqd, bfqq, "exit_bfqq: %p, %d", bfqq,
-+ atomic_read(&bfqq->ref));
-+
-+ bfq_put_cooperator(bfqq);
-+
-+ bfq_put_queue(bfqq);
-+}
-+
-+static void bfq_init_icq(struct io_cq *icq)
-+{
-+ struct bfq_io_cq *bic = icq_to_bic(icq);
-+
-+ bic->ttime.last_end_request = jiffies;
-+}
-+
-+static void bfq_exit_icq(struct io_cq *icq)
-+{
-+ struct bfq_io_cq *bic = icq_to_bic(icq);
-+ struct bfq_data *bfqd = bic_to_bfqd(bic);
-+
-+ if (bic->bfqq[BLK_RW_ASYNC]) {
-+ bfq_exit_bfqq(bfqd, bic->bfqq[BLK_RW_ASYNC]);
-+ bic->bfqq[BLK_RW_ASYNC] = NULL;
-+ }
-+
-+ if (bic->bfqq[BLK_RW_SYNC]) {
-+ bfq_exit_bfqq(bfqd, bic->bfqq[BLK_RW_SYNC]);
-+ bic->bfqq[BLK_RW_SYNC] = NULL;
-+ }
-+}
-+
-+/*
-+ * Update the entity prio values; note that the new values will not
-+ * be used until the next (re)activation.
-+ */
-+static void bfq_init_prio_data(struct bfq_queue *bfqq, struct bfq_io_cq *bic)
-+{
-+ struct task_struct *tsk = current;
-+ int ioprio_class;
-+
-+ if (!bfq_bfqq_prio_changed(bfqq))
-+ return;
-+
-+ ioprio_class = IOPRIO_PRIO_CLASS(bic->ioprio);
-+ switch (ioprio_class) {
-+ default:
-+ dev_err(bfqq->bfqd->queue->backing_dev_info.dev,
-+ "bfq: bad prio %x\n", ioprio_class);
-+ case IOPRIO_CLASS_NONE:
-+ /*
-+ * No prio set, inherit CPU scheduling settings.
-+ */
-+ bfqq->entity.new_ioprio = task_nice_ioprio(tsk);
-+ bfqq->entity.new_ioprio_class = task_nice_ioclass(tsk);
-+ break;
-+ case IOPRIO_CLASS_RT:
-+ bfqq->entity.new_ioprio = IOPRIO_PRIO_DATA(bic->ioprio);
-+ bfqq->entity.new_ioprio_class = IOPRIO_CLASS_RT;
-+ break;
-+ case IOPRIO_CLASS_BE:
-+ bfqq->entity.new_ioprio = IOPRIO_PRIO_DATA(bic->ioprio);
-+ bfqq->entity.new_ioprio_class = IOPRIO_CLASS_BE;
-+ break;
-+ case IOPRIO_CLASS_IDLE:
-+ bfqq->entity.new_ioprio_class = IOPRIO_CLASS_IDLE;
-+ bfqq->entity.new_ioprio = 7;
-+ bfq_clear_bfqq_idle_window(bfqq);
-+ break;
-+ }
-+
-+ bfqq->entity.ioprio_changed = 1;
-+
-+ /*
-+ * Keep track of original prio settings in case we have to temporarily
-+ * elevate the priority of this queue.
-+ */
-+ bfqq->org_ioprio = bfqq->entity.new_ioprio;
-+ bfq_clear_bfqq_prio_changed(bfqq);
-+}
-+
-+static void bfq_changed_ioprio(struct bfq_io_cq *bic)
-+{
-+ struct bfq_data *bfqd;
-+ struct bfq_queue *bfqq, *new_bfqq;
-+ struct bfq_group *bfqg;
-+ unsigned long uninitialized_var(flags);
-+ int ioprio = bic->icq.ioc->ioprio;
-+
-+ bfqd = bfq_get_bfqd_locked(&(bic->icq.q->elevator->elevator_data),
-+ &flags);
-+ /*
-+ * This condition may trigger on a newly created bic, be sure to drop
-+ * the lock before returning.
-+ */
-+ if (unlikely(bfqd == NULL) || likely(bic->ioprio == ioprio))
-+ goto out;
-+
-+ bfqq = bic->bfqq[BLK_RW_ASYNC];
-+ if (bfqq != NULL) {
-+ bfqg = container_of(bfqq->entity.sched_data, struct bfq_group,
-+ sched_data);
-+ new_bfqq = bfq_get_queue(bfqd, bfqg, BLK_RW_ASYNC, bic,
-+ GFP_ATOMIC);
-+ if (new_bfqq != NULL) {
-+ bic->bfqq[BLK_RW_ASYNC] = new_bfqq;
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "changed_ioprio: bfqq %p %d",
-+ bfqq, atomic_read(&bfqq->ref));
-+ bfq_put_queue(bfqq);
-+ }
-+ }
-+
-+ bfqq = bic->bfqq[BLK_RW_SYNC];
-+ if (bfqq != NULL)
-+ bfq_mark_bfqq_prio_changed(bfqq);
-+
-+ bic->ioprio = ioprio;
-+
-+out:
-+ bfq_put_bfqd_unlock(bfqd, &flags);
-+}
-+
-+static void bfq_init_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq,
-+ pid_t pid, int is_sync)
-+{
-+ RB_CLEAR_NODE(&bfqq->entity.rb_node);
-+ INIT_LIST_HEAD(&bfqq->fifo);
-+
-+ atomic_set(&bfqq->ref, 0);
-+ bfqq->bfqd = bfqd;
-+
-+ bfq_mark_bfqq_prio_changed(bfqq);
-+
-+ if (is_sync) {
-+ if (!bfq_class_idle(bfqq))
-+ bfq_mark_bfqq_idle_window(bfqq);
-+ bfq_mark_bfqq_sync(bfqq);
-+ }
-+
-+ /* Tentative initial value to trade off between thr and lat */
-+ bfqq->max_budget = (2 * bfq_max_budget(bfqd)) / 3;
-+ bfqq->pid = pid;
-+
-+ bfqq->raising_coeff = 1;
-+ bfqq->last_rais_start_finish = 0;
-+ bfqq->soft_rt_next_start = -1;
-+}
-+
-+static struct bfq_queue *bfq_find_alloc_queue(struct bfq_data *bfqd,
-+ struct bfq_group *bfqg,
-+ int is_sync,
-+ struct bfq_io_cq *bic,
-+ gfp_t gfp_mask)
-+{
-+ struct bfq_queue *bfqq, *new_bfqq = NULL;
-+
-+retry:
-+ /* bic always exists here */
-+ bfqq = bic_to_bfqq(bic, is_sync);
-+
-+ /*
-+ * Always try a new alloc if we fall back to the OOM bfqq
-+ * originally, since it should just be a temporary situation.
-+ */
-+ if (bfqq == NULL || bfqq == &bfqd->oom_bfqq) {
-+ bfqq = NULL;
-+ if (new_bfqq != NULL) {
-+ bfqq = new_bfqq;
-+ new_bfqq = NULL;
-+ } else if (gfp_mask & __GFP_WAIT) {
-+ spin_unlock_irq(bfqd->queue->queue_lock);
-+ new_bfqq = kmem_cache_alloc_node(bfq_pool,
-+ gfp_mask | __GFP_ZERO,
-+ bfqd->queue->node);
-+ spin_lock_irq(bfqd->queue->queue_lock);
-+ if (new_bfqq != NULL)
-+ goto retry;
-+ } else {
-+ bfqq = kmem_cache_alloc_node(bfq_pool,
-+ gfp_mask | __GFP_ZERO,
-+ bfqd->queue->node);
-+ }
-+
-+ if (bfqq != NULL) {
-+ bfq_init_bfqq(bfqd, bfqq, current->pid, is_sync);
-+ bfq_log_bfqq(bfqd, bfqq, "allocated");
-+ } else {
-+ bfqq = &bfqd->oom_bfqq;
-+ bfq_log_bfqq(bfqd, bfqq, "using oom bfqq");
-+ }
-+
-+ bfq_init_prio_data(bfqq, bic);
-+ bfq_init_entity(&bfqq->entity, bfqg);
-+ }
-+
-+ if (new_bfqq != NULL)
-+ kmem_cache_free(bfq_pool, new_bfqq);
-+
-+ return bfqq;
-+}
-+
-+static struct bfq_queue **bfq_async_queue_prio(struct bfq_data *bfqd,
-+ struct bfq_group *bfqg,
-+ int ioprio_class, int ioprio)
-+{
-+ switch (ioprio_class) {
-+ case IOPRIO_CLASS_RT:
-+ return &bfqg->async_bfqq[0][ioprio];
-+ case IOPRIO_CLASS_NONE:
-+ ioprio = IOPRIO_NORM;
-+ /* fall through */
-+ case IOPRIO_CLASS_BE:
-+ return &bfqg->async_bfqq[1][ioprio];
-+ case IOPRIO_CLASS_IDLE:
-+ return &bfqg->async_idle_bfqq;
-+ default:
-+ BUG();
-+ }
-+}
-+
-+static struct bfq_queue *bfq_get_queue(struct bfq_data *bfqd,
-+ struct bfq_group *bfqg, int is_sync,
-+ struct bfq_io_cq *bic, gfp_t gfp_mask)
-+{
-+ const int ioprio = IOPRIO_PRIO_DATA(bic->ioprio);
-+ const int ioprio_class = IOPRIO_PRIO_CLASS(bic->ioprio);
-+ struct bfq_queue **async_bfqq = NULL;
-+ struct bfq_queue *bfqq = NULL;
-+
-+ if (!is_sync) {
-+ async_bfqq = bfq_async_queue_prio(bfqd, bfqg, ioprio_class,
-+ ioprio);
-+ bfqq = *async_bfqq;
-+ }
-+
-+ if (bfqq == NULL)
-+ bfqq = bfq_find_alloc_queue(bfqd, bfqg, is_sync, bic, gfp_mask);
-+
-+ /*
-+ * Pin the queue now that it's allocated, scheduler exit will prune it.
-+ */
-+ if (!is_sync && *async_bfqq == NULL) {
-+ atomic_inc(&bfqq->ref);
-+ bfq_log_bfqq(bfqd, bfqq, "get_queue, bfqq not in async: %p, %d",
-+ bfqq, atomic_read(&bfqq->ref));
-+ *async_bfqq = bfqq;
-+ }
-+
-+ atomic_inc(&bfqq->ref);
-+ bfq_log_bfqq(bfqd, bfqq, "get_queue, at end: %p, %d", bfqq,
-+ atomic_read(&bfqq->ref));
-+ return bfqq;
-+}
-+
-+static void bfq_update_io_thinktime(struct bfq_data *bfqd,
-+ struct bfq_io_cq *bic)
-+{
-+ unsigned long elapsed = jiffies - bic->ttime.last_end_request;
-+ unsigned long ttime = min(elapsed, 2UL * bfqd->bfq_slice_idle);
-+
-+ bic->ttime.ttime_samples = (7*bic->ttime.ttime_samples + 256) / 8;
-+ bic->ttime.ttime_total = (7*bic->ttime.ttime_total + 256*ttime) / 8;
-+ bic->ttime.ttime_mean = (bic->ttime.ttime_total + 128) /
-+ bic->ttime.ttime_samples;
-+}
-+
-+static void bfq_update_io_seektime(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq,
-+ struct request *rq)
-+{
-+ sector_t sdist;
-+ u64 total;
-+
-+ if (bfqq->last_request_pos < blk_rq_pos(rq))
-+ sdist = blk_rq_pos(rq) - bfqq->last_request_pos;
-+ else
-+ sdist = bfqq->last_request_pos - blk_rq_pos(rq);
-+
-+ /*
-+ * Don't allow the seek distance to get too large from the
-+ * odd fragment, pagein, etc.
-+ */
-+ if (bfqq->seek_samples == 0) /* first request, not really a seek */
-+ sdist = 0;
-+ else if (bfqq->seek_samples <= 60) /* second & third seek */
-+ sdist = min(sdist, (bfqq->seek_mean * 4) + 2*1024*1024);
-+ else
-+ sdist = min(sdist, (bfqq->seek_mean * 4) + 2*1024*64);
-+
-+ bfqq->seek_samples = (7*bfqq->seek_samples + 256) / 8;
-+ bfqq->seek_total = (7*bfqq->seek_total + (u64)256*sdist) / 8;
-+ total = bfqq->seek_total + (bfqq->seek_samples/2);
-+ do_div(total, bfqq->seek_samples);
-+ bfqq->seek_mean = (sector_t)total;
-+
-+ bfq_log_bfqq(bfqd, bfqq, "dist=%llu mean=%llu", (u64)sdist,
-+ (u64)bfqq->seek_mean);
-+}
-+
-+/*
-+ * Disable idle window if the process thinks too long or seeks so much that
-+ * it doesn't matter.
-+ */
-+static void bfq_update_idle_window(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq,
-+ struct bfq_io_cq *bic)
-+{
-+ int enable_idle;
-+
-+ /* Don't idle for async or idle io prio class. */
-+ if (!bfq_bfqq_sync(bfqq) || bfq_class_idle(bfqq))
-+ return;
-+
-+ enable_idle = bfq_bfqq_idle_window(bfqq);
-+
-+ if (atomic_read(&bic->icq.ioc->active_ref) == 0 ||
-+ bfqd->bfq_slice_idle == 0 ||
-+ (bfqd->hw_tag && BFQQ_SEEKY(bfqq) &&
-+ bfqq->raising_coeff == 1))
-+ enable_idle = 0;
-+ else if (bfq_sample_valid(bic->ttime.ttime_samples)) {
-+ if (bic->ttime.ttime_mean > bfqd->bfq_slice_idle &&
-+ bfqq->raising_coeff == 1)
-+ enable_idle = 0;
-+ else
-+ enable_idle = 1;
-+ }
-+ bfq_log_bfqq(bfqd, bfqq, "update_idle_window: enable_idle %d",
-+ enable_idle);
-+
-+ if (enable_idle)
-+ bfq_mark_bfqq_idle_window(bfqq);
-+ else
-+ bfq_clear_bfqq_idle_window(bfqq);
-+}
-+
-+/*
-+ * Called when a new fs request (rq) is added to bfqq. Check if there's
-+ * something we should do about it.
-+ */
-+static void bfq_rq_enqueued(struct bfq_data *bfqd, struct bfq_queue *bfqq,
-+ struct request *rq)
-+{
-+ struct bfq_io_cq *bic = RQ_BIC(rq);
-+
-+ if (rq->cmd_flags & REQ_META)
-+ bfqq->meta_pending++;
-+
-+ bfq_update_io_thinktime(bfqd, bic);
-+ bfq_update_io_seektime(bfqd, bfqq, rq);
-+ if (bfqq->entity.service > bfq_max_budget(bfqd) / 8 ||
-+ !BFQQ_SEEKY(bfqq))
-+ bfq_update_idle_window(bfqd, bfqq, bic);
-+
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "rq_enqueued: idle_window=%d (seeky %d, mean %llu)",
-+ bfq_bfqq_idle_window(bfqq), BFQQ_SEEKY(bfqq),
-+ (long long unsigned)bfqq->seek_mean);
-+
-+ bfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
-+
-+ if (bfqq == bfqd->in_service_queue && bfq_bfqq_wait_request(bfqq)) {
-+ int small_req = bfqq->queued[rq_is_sync(rq)] == 1 &&
-+ blk_rq_sectors(rq) < 32;
-+ int budget_timeout = bfq_bfqq_budget_timeout(bfqq);
-+
-+ /*
-+ * There is just this request queued: if the request
-+ * is small and the queue is not to be expired, then
-+ * just exit.
-+ *
-+ * In this way, if the disk is being idled to wait for
-+ * a new request from the in-service queue, we avoid
-+ * unplugging the device and committing the disk to serve
-+ * just a small request. On the contrary, we wait for
-+ * the block layer to decide when to unplug the device:
-+ * hopefully, new requests will be merged to this one
-+ * quickly, then the device will be unplugged and
-+ * larger requests will be dispatched.
-+ */
-+ if (small_req && !budget_timeout)
-+ return;
-+
-+ /*
-+ * A large enough request arrived, or the queue is to
-+ * be expired: in both cases disk idling is to be
-+ * stopped, so clear wait_request flag and reset
-+ * timer.
-+ */
-+ bfq_clear_bfqq_wait_request(bfqq);
-+ del_timer(&bfqd->idle_slice_timer);
-+
-+ /*
-+ * The queue is not empty, because a new request just
-+ * arrived. Hence we can safely expire the queue, in
-+ * case of budget timeout, without risking that the
-+ * timestamps of the queue are not updated correctly.
-+ * See [1] for more details.
-+ */
-+ if (budget_timeout)
-+ bfq_bfqq_expire(bfqd, bfqq, 0, BFQ_BFQQ_BUDGET_TIMEOUT);
-+
-+ /*
-+ * Let the request rip immediately, or let a new queue be
-+ * selected if bfqq has just been expired.
-+ */
-+ __blk_run_queue(bfqd->queue);
-+ }
-+}
-+
-+static void bfq_insert_request(struct request_queue *q, struct request *rq)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+ struct bfq_queue *bfqq = RQ_BFQQ(rq);
-+
-+ assert_spin_locked(bfqd->queue->queue_lock);
-+ bfq_init_prio_data(bfqq, RQ_BIC(rq));
-+
-+ bfq_add_rq_rb(rq);
-+
-+ rq_set_fifo_time(rq, jiffies + bfqd->bfq_fifo_expire[rq_is_sync(rq)]);
-+ list_add_tail(&rq->queuelist, &bfqq->fifo);
-+
-+ bfq_rq_enqueued(bfqd, bfqq, rq);
-+}
-+
-+static void bfq_update_hw_tag(struct bfq_data *bfqd)
-+{
-+ bfqd->max_rq_in_driver = max(bfqd->max_rq_in_driver,
-+ bfqd->rq_in_driver);
-+
-+ if (bfqd->hw_tag == 1)
-+ return;
-+
-+ /*
-+ * This sample is valid if the number of outstanding requests
-+ * is large enough to allow a queueing behavior. Note that the
-+ * sum is not exact, as it's not taking into account deactivated
-+ * requests.
-+ */
-+ if (bfqd->rq_in_driver + bfqd->queued < BFQ_HW_QUEUE_THRESHOLD)
-+ return;
-+
-+ if (bfqd->hw_tag_samples++ < BFQ_HW_QUEUE_SAMPLES)
-+ return;
-+
-+ bfqd->hw_tag = bfqd->max_rq_in_driver > BFQ_HW_QUEUE_THRESHOLD;
-+ bfqd->max_rq_in_driver = 0;
-+ bfqd->hw_tag_samples = 0;
-+}
-+
-+static void bfq_completed_request(struct request_queue *q, struct request *rq)
-+{
-+ struct bfq_queue *bfqq = RQ_BFQQ(rq);
-+ struct bfq_data *bfqd = bfqq->bfqd;
-+ const int sync = rq_is_sync(rq);
-+
-+ bfq_log_bfqq(bfqd, bfqq, "completed %u sects req (%d)",
-+ blk_rq_sectors(rq), sync);
-+
-+ bfq_update_hw_tag(bfqd);
-+
-+ WARN_ON(!bfqd->rq_in_driver);
-+ WARN_ON(!bfqq->dispatched);
-+ bfqd->rq_in_driver--;
-+ bfqq->dispatched--;
-+
-+ if (bfq_bfqq_sync(bfqq))
-+ bfqd->sync_flight--;
-+
-+ if (sync)
-+ RQ_BIC(rq)->ttime.last_end_request = jiffies;
-+
-+ /*
-+ * The computation of softrt_next_start was scheduled for the next
-+ * request completion: it is now time to compute it.
-+ */
-+ if (bfq_bfqq_softrt_update(bfqq) && RB_EMPTY_ROOT(&bfqq->sort_list))
-+ bfqq->soft_rt_next_start =
-+ bfq_bfqq_softrt_next_start(bfqd, bfqq);
-+
-+ /*
-+ * If this is the in-service queue, check if it needs to be expired,
-+ * or if we want to idle in case it has no pending requests.
-+ */
-+ if (bfqd->in_service_queue == bfqq) {
-+ if (bfq_bfqq_budget_new(bfqq))
-+ bfq_set_budget_timeout(bfqd);
-+
-+ if (bfq_bfqq_must_idle(bfqq)) {
-+ bfq_arm_slice_timer(bfqd);
-+ goto out;
-+ } else if (bfq_may_expire_for_budg_timeout(bfqq))
-+ bfq_bfqq_expire(bfqd, bfqq, 0, BFQ_BFQQ_BUDGET_TIMEOUT);
-+ else if (RB_EMPTY_ROOT(&bfqq->sort_list) &&
-+ (bfqq->dispatched == 0 ||
-+ !bfq_bfqq_must_not_expire(bfqq)))
-+ bfq_bfqq_expire(bfqd, bfqq, 0,
-+ BFQ_BFQQ_NO_MORE_REQUESTS);
-+ }
-+
-+ if (!bfqd->rq_in_driver)
-+ bfq_schedule_dispatch(bfqd);
-+
-+out:
-+ return;
-+}
-+
-+static inline int __bfq_may_queue(struct bfq_queue *bfqq)
-+{
-+ if (bfq_bfqq_wait_request(bfqq) && bfq_bfqq_must_alloc(bfqq)) {
-+ bfq_clear_bfqq_must_alloc(bfqq);
-+ return ELV_MQUEUE_MUST;
-+ }
-+
-+ return ELV_MQUEUE_MAY;
-+}
-+
-+static int bfq_may_queue(struct request_queue *q, int rw)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+ struct task_struct *tsk = current;
-+ struct bfq_io_cq *bic;
-+ struct bfq_queue *bfqq;
-+
-+ /*
-+ * Don't force setup of a queue from here, as a call to may_queue
-+ * does not necessarily imply that a request actually will be queued.
-+ * So just lookup a possibly existing queue, or return 'may queue'
-+ * if that fails.
-+ */
-+ bic = bfq_bic_lookup(bfqd, tsk->io_context);
-+ if (bic == NULL)
-+ return ELV_MQUEUE_MAY;
-+
-+ bfqq = bic_to_bfqq(bic, rw_is_sync(rw));
-+ if (bfqq != NULL) {
-+ bfq_init_prio_data(bfqq, bic);
-+
-+ return __bfq_may_queue(bfqq);
-+ }
-+
-+ return ELV_MQUEUE_MAY;
-+}
-+
-+/*
-+ * Queue lock held here.
-+ */
-+static void bfq_put_request(struct request *rq)
-+{
-+ struct bfq_queue *bfqq = RQ_BFQQ(rq);
-+
-+ if (bfqq != NULL) {
-+ const int rw = rq_data_dir(rq);
-+
-+ BUG_ON(!bfqq->allocated[rw]);
-+ bfqq->allocated[rw]--;
-+
-+ rq->elv.priv[0] = NULL;
-+ rq->elv.priv[1] = NULL;
-+
-+ bfq_log_bfqq(bfqq->bfqd, bfqq, "put_request %p, %d",
-+ bfqq, atomic_read(&bfqq->ref));
-+ bfq_put_queue(bfqq);
-+ }
-+}
-+
-+static struct bfq_queue *
-+bfq_merge_bfqqs(struct bfq_data *bfqd, struct bfq_io_cq *bic,
-+ struct bfq_queue *bfqq)
-+{
-+ bfq_log_bfqq(bfqd, bfqq, "merging with queue %lu",
-+ (long unsigned)bfqq->new_bfqq->pid);
-+ bic_set_bfqq(bic, bfqq->new_bfqq, 1);
-+ bfq_mark_bfqq_coop(bfqq->new_bfqq);
-+ bfq_put_queue(bfqq);
-+ return bic_to_bfqq(bic, 1);
-+}
-+
-+/*
-+ * Returns NULL if a new bfqq should be allocated, or the old bfqq if this
-+ * was the last process referring to said bfqq.
-+ */
-+static struct bfq_queue *
-+bfq_split_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq)
-+{
-+ bfq_log_bfqq(bfqq->bfqd, bfqq, "splitting queue");
-+ if (bfqq_process_refs(bfqq) == 1) {
-+ bfqq->pid = current->pid;
-+ bfq_clear_bfqq_coop(bfqq);
-+ bfq_clear_bfqq_split_coop(bfqq);
-+ return bfqq;
-+ }
-+
-+ bic_set_bfqq(bic, NULL, 1);
-+
-+ bfq_put_cooperator(bfqq);
-+
-+ bfq_put_queue(bfqq);
-+ return NULL;
-+}
-+
-+/*
-+ * Allocate bfq data structures associated with this request.
-+ */
-+static int bfq_set_request(struct request_queue *q, struct request *rq,
-+ struct bio *bio, gfp_t gfp_mask)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+ struct bfq_io_cq *bic = icq_to_bic(rq->elv.icq);
-+ const int rw = rq_data_dir(rq);
-+ const int is_sync = rq_is_sync(rq);
-+ struct bfq_queue *bfqq;
-+ struct bfq_group *bfqg;
-+ unsigned long flags;
-+
-+ might_sleep_if(gfp_mask & __GFP_WAIT);
-+
-+ bfq_changed_ioprio(bic);
-+
-+ spin_lock_irqsave(q->queue_lock, flags);
-+
-+ if (bic == NULL)
-+ goto queue_fail;
-+
-+ bfqg = bfq_bic_update_cgroup(bic);
-+
-+new_queue:
-+ bfqq = bic_to_bfqq(bic, is_sync);
-+ if (bfqq == NULL || bfqq == &bfqd->oom_bfqq) {
-+ bfqq = bfq_get_queue(bfqd, bfqg, is_sync, bic, gfp_mask);
-+ bic_set_bfqq(bic, bfqq, is_sync);
-+ } else {
-+ /*
-+ * If the queue was seeky for too long, break it apart.
-+ */
-+ if (bfq_bfqq_coop(bfqq) && bfq_bfqq_split_coop(bfqq)) {
-+ bfq_log_bfqq(bfqd, bfqq, "breaking apart bfqq");
-+ bfqq = bfq_split_bfqq(bic, bfqq);
-+ if (!bfqq)
-+ goto new_queue;
-+ }
-+
-+ /*
-+ * Check to see if this queue is scheduled to merge with
-+ * another closely cooperating queue. The merging of queues
-+ * happens here as it must be done in process context.
-+ * The reference on new_bfqq was taken in merge_bfqqs.
-+ */
-+ if (bfqq->new_bfqq != NULL)
-+ bfqq = bfq_merge_bfqqs(bfqd, bic, bfqq);
-+ }
-+
-+ bfqq->allocated[rw]++;
-+ atomic_inc(&bfqq->ref);
-+ bfq_log_bfqq(bfqd, bfqq, "set_request: bfqq %p, %d", bfqq,
-+ atomic_read(&bfqq->ref));
-+
-+ rq->elv.priv[0] = bic;
-+ rq->elv.priv[1] = bfqq;
-+
-+ spin_unlock_irqrestore(q->queue_lock, flags);
-+
-+ return 0;
-+
-+queue_fail:
-+ bfq_schedule_dispatch(bfqd);
-+ spin_unlock_irqrestore(q->queue_lock, flags);
-+
-+ return 1;
-+}
-+
-+static void bfq_kick_queue(struct work_struct *work)
-+{
-+ struct bfq_data *bfqd =
-+ container_of(work, struct bfq_data, unplug_work);
-+ struct request_queue *q = bfqd->queue;
-+
-+ spin_lock_irq(q->queue_lock);
-+ __blk_run_queue(q);
-+ spin_unlock_irq(q->queue_lock);
-+}
-+
-+/*
-+ * Handler of the expiration of the timer running if the in-service queue
-+ * is idling inside its time slice.
-+ */
-+static void bfq_idle_slice_timer(unsigned long data)
-+{
-+ struct bfq_data *bfqd = (struct bfq_data *)data;
-+ struct bfq_queue *bfqq;
-+ unsigned long flags;
-+ enum bfqq_expiration reason;
-+
-+ spin_lock_irqsave(bfqd->queue->queue_lock, flags);
-+
-+ bfqq = bfqd->in_service_queue;
-+ /*
-+ * Theoretical race here: the in-service queue can be NULL or different
-+ * from the queue that was idling if the timer handler spins on
-+ * the queue_lock and a new request arrives for the current
-+ * queue and there is a full dispatch cycle that changes the
-+ * in-service queue. This can hardly happen, but in the worst case
-+ * we just expire a queue too early.
-+ */
-+ if (bfqq != NULL) {
-+ bfq_log_bfqq(bfqd, bfqq, "slice_timer expired");
-+ if (bfq_bfqq_budget_timeout(bfqq))
-+ /*
-+ * Also here the queue can be safely expired
-+ * for budget timeout without wasting
-+ * guarantees
-+ */
-+ reason = BFQ_BFQQ_BUDGET_TIMEOUT;
-+ else if (bfqq->queued[0] == 0 && bfqq->queued[1] == 0)
-+ /*
-+ * The queue may not be empty upon timer expiration,
-+ * because we may not disable the timer when the first
-+ * request of the in-service queue arrives during
-+ * disk idling
-+ */
-+ reason = BFQ_BFQQ_TOO_IDLE;
-+ else
-+ goto schedule_dispatch;
-+
-+ bfq_bfqq_expire(bfqd, bfqq, 1, reason);
-+ }
-+
-+schedule_dispatch:
-+ bfq_schedule_dispatch(bfqd);
-+
-+ spin_unlock_irqrestore(bfqd->queue->queue_lock, flags);
-+}
-+
-+static void bfq_shutdown_timer_wq(struct bfq_data *bfqd)
-+{
-+ del_timer_sync(&bfqd->idle_slice_timer);
-+ cancel_work_sync(&bfqd->unplug_work);
-+}
-+
-+static inline void __bfq_put_async_bfqq(struct bfq_data *bfqd,
-+ struct bfq_queue **bfqq_ptr)
-+{
-+ struct bfq_group *root_group = bfqd->root_group;
-+ struct bfq_queue *bfqq = *bfqq_ptr;
-+
-+ bfq_log(bfqd, "put_async_bfqq: %p", bfqq);
-+ if (bfqq != NULL) {
-+ bfq_bfqq_move(bfqd, bfqq, &bfqq->entity, root_group);
-+ bfq_log_bfqq(bfqd, bfqq, "put_async_bfqq: putting %p, %d",
-+ bfqq, atomic_read(&bfqq->ref));
-+ bfq_put_queue(bfqq);
-+ *bfqq_ptr = NULL;
-+ }
-+}
-+
-+/*
-+ * Release all the bfqg references to its async queues. If we are
-+ * deallocating the group these queues may still contain requests, so
-+ * we reparent them to the root cgroup (i.e., the only one that will
-+ * exist for sure untill all the requests on a device are gone).
-+ */
-+static void bfq_put_async_queues(struct bfq_data *bfqd, struct bfq_group *bfqg)
-+{
-+ int i, j;
-+
-+ for (i = 0; i < 2; i++)
-+ for (j = 0; j < IOPRIO_BE_NR; j++)
-+ __bfq_put_async_bfqq(bfqd, &bfqg->async_bfqq[i][j]);
-+
-+ __bfq_put_async_bfqq(bfqd, &bfqg->async_idle_bfqq);
-+}
-+
-+static void bfq_exit_queue(struct elevator_queue *e)
-+{
-+ struct bfq_data *bfqd = e->elevator_data;
-+ struct request_queue *q = bfqd->queue;
-+ struct bfq_queue *bfqq, *n;
-+
-+ bfq_shutdown_timer_wq(bfqd);
-+
-+ spin_lock_irq(q->queue_lock);
-+
-+ BUG_ON(bfqd->in_service_queue != NULL);
-+ list_for_each_entry_safe(bfqq, n, &bfqd->idle_list, bfqq_list)
-+ bfq_deactivate_bfqq(bfqd, bfqq, 0);
-+
-+ bfq_disconnect_groups(bfqd);
-+ spin_unlock_irq(q->queue_lock);
-+
-+ bfq_shutdown_timer_wq(bfqd);
-+
-+ synchronize_rcu();
-+
-+ BUG_ON(timer_pending(&bfqd->idle_slice_timer));
-+
-+ bfq_free_root_group(bfqd);
-+ kfree(bfqd);
-+}
-+
-+static int bfq_init_queue(struct request_queue *q)
-+{
-+ struct bfq_group *bfqg;
-+ struct bfq_data *bfqd;
-+
-+ bfqd = kzalloc_node(sizeof(*bfqd), GFP_KERNEL, q->node);
-+ if (bfqd == NULL)
-+ return -ENOMEM;
-+
-+ /*
-+ * Our fallback bfqq if bfq_find_alloc_queue() runs into OOM issues.
-+ * Grab a permanent reference to it, so that the normal code flow
-+ * will not attempt to free it.
-+ */
-+ bfq_init_bfqq(bfqd, &bfqd->oom_bfqq, 1, 0);
-+ atomic_inc(&bfqd->oom_bfqq.ref);
-+
-+ bfqd->queue = q;
-+ q->elevator->elevator_data = bfqd;
-+
-+ bfqg = bfq_alloc_root_group(bfqd, q->node);
-+ if (bfqg == NULL) {
-+ kfree(bfqd);
-+ return -ENOMEM;
-+ }
-+
-+ bfqd->root_group = bfqg;
-+
-+ init_timer(&bfqd->idle_slice_timer);
-+ bfqd->idle_slice_timer.function = bfq_idle_slice_timer;
-+ bfqd->idle_slice_timer.data = (unsigned long)bfqd;
-+
-+ bfqd->rq_pos_tree = RB_ROOT;
-+
-+ INIT_WORK(&bfqd->unplug_work, bfq_kick_queue);
-+
-+ INIT_LIST_HEAD(&bfqd->active_list);
-+ INIT_LIST_HEAD(&bfqd->idle_list);
-+
-+ bfqd->hw_tag = -1;
-+
-+ bfqd->bfq_max_budget = bfq_default_max_budget;
-+
-+ bfqd->bfq_quantum = bfq_quantum;
-+ bfqd->bfq_fifo_expire[0] = bfq_fifo_expire[0];
-+ bfqd->bfq_fifo_expire[1] = bfq_fifo_expire[1];
-+ bfqd->bfq_back_max = bfq_back_max;
-+ bfqd->bfq_back_penalty = bfq_back_penalty;
-+ bfqd->bfq_slice_idle = bfq_slice_idle;
-+ bfqd->bfq_class_idle_last_service = 0;
-+ bfqd->bfq_max_budget_async_rq = bfq_max_budget_async_rq;
-+ bfqd->bfq_timeout[BLK_RW_ASYNC] = bfq_timeout_async;
-+ bfqd->bfq_timeout[BLK_RW_SYNC] = bfq_timeout_sync;
-+
-+ bfqd->low_latency = true;
-+
-+ bfqd->bfq_raising_coeff = 20;
-+ bfqd->bfq_raising_rt_max_time = msecs_to_jiffies(300);
-+ bfqd->bfq_raising_max_time = 0;
-+ bfqd->bfq_raising_min_idle_time = msecs_to_jiffies(2000);
-+ bfqd->bfq_raising_min_inter_arr_async = msecs_to_jiffies(500);
-+ bfqd->bfq_raising_max_softrt_rate = 7000; /*
-+ * Approximate rate required
-+ * to playback or record a
-+ * high-definition compressed
-+ * video.
-+ */
-+ bfqd->raised_busy_queues = 0;
-+
-+ /* Initially estimate the device's peak rate as the reference rate */
-+ if (blk_queue_nonrot(bfqd->queue)) {
-+ bfqd->RT_prod = R_nonrot * T_nonrot;
-+ bfqd->peak_rate = R_nonrot;
-+ } else {
-+ bfqd->RT_prod = R_rot * T_rot;
-+ bfqd->peak_rate = R_rot;
-+ }
-+
-+ return 0;
-+}
-+
-+static void bfq_slab_kill(void)
-+{
-+ if (bfq_pool != NULL)
-+ kmem_cache_destroy(bfq_pool);
-+}
-+
-+static int __init bfq_slab_setup(void)
-+{
-+ bfq_pool = KMEM_CACHE(bfq_queue, 0);
-+ if (bfq_pool == NULL)
-+ return -ENOMEM;
-+ return 0;
-+}
-+
-+static ssize_t bfq_var_show(unsigned int var, char *page)
-+{
-+ return sprintf(page, "%d\n", var);
-+}
-+
-+static ssize_t bfq_var_store(unsigned long *var, const char *page, size_t count)
-+{
-+ unsigned long new_val;
-+ int ret = kstrtoul(page, 10, &new_val);
-+
-+ if (ret == 0)
-+ *var = new_val;
-+
-+ return count;
-+}
-+
-+static ssize_t bfq_raising_max_time_show(struct elevator_queue *e, char *page)
-+{
-+ struct bfq_data *bfqd = e->elevator_data;
-+ return sprintf(page, "%d\n", bfqd->bfq_raising_max_time > 0 ?
-+ jiffies_to_msecs(bfqd->bfq_raising_max_time) :
-+ jiffies_to_msecs(bfq_wrais_duration(bfqd)));
-+}
-+
-+static ssize_t bfq_weights_show(struct elevator_queue *e, char *page)
-+{
-+ struct bfq_queue *bfqq;
-+ struct bfq_data *bfqd = e->elevator_data;
-+ ssize_t num_char = 0;
-+
-+ num_char += sprintf(page + num_char, "Tot reqs queued %d\n\n",
-+ bfqd->queued);
-+
-+ spin_lock_irq(bfqd->queue->queue_lock);
-+
-+ num_char += sprintf(page + num_char, "Active:\n");
-+ list_for_each_entry(bfqq, &bfqd->active_list, bfqq_list) {
-+ num_char += sprintf(page + num_char,
-+ "pid%d: weight %hu, nr_queued %d %d,"
-+ " dur %d/%u\n",
-+ bfqq->pid,
-+ bfqq->entity.weight,
-+ bfqq->queued[0],
-+ bfqq->queued[1],
-+ jiffies_to_msecs(jiffies -
-+ bfqq->last_rais_start_finish),
-+ jiffies_to_msecs(bfqq->raising_cur_max_time));
-+ }
-+
-+ num_char += sprintf(page + num_char, "Idle:\n");
-+ list_for_each_entry(bfqq, &bfqd->idle_list, bfqq_list) {
-+ num_char += sprintf(page + num_char,
-+ "pid%d: weight %hu, dur %d/%u\n",
-+ bfqq->pid,
-+ bfqq->entity.weight,
-+ jiffies_to_msecs(jiffies -
-+ bfqq->last_rais_start_finish),
-+ jiffies_to_msecs(bfqq->raising_cur_max_time));
-+ }
-+
-+ spin_unlock_irq(bfqd->queue->queue_lock);
-+
-+ return num_char;
-+}
-+
-+#define SHOW_FUNCTION(__FUNC, __VAR, __CONV) \
-+static ssize_t __FUNC(struct elevator_queue *e, char *page) \
-+{ \
-+ struct bfq_data *bfqd = e->elevator_data; \
-+ unsigned int __data = __VAR; \
-+ if (__CONV) \
-+ __data = jiffies_to_msecs(__data); \
-+ return bfq_var_show(__data, (page)); \
-+}
-+SHOW_FUNCTION(bfq_quantum_show, bfqd->bfq_quantum, 0);
-+SHOW_FUNCTION(bfq_fifo_expire_sync_show, bfqd->bfq_fifo_expire[1], 1);
-+SHOW_FUNCTION(bfq_fifo_expire_async_show, bfqd->bfq_fifo_expire[0], 1);
-+SHOW_FUNCTION(bfq_back_seek_max_show, bfqd->bfq_back_max, 0);
-+SHOW_FUNCTION(bfq_back_seek_penalty_show, bfqd->bfq_back_penalty, 0);
-+SHOW_FUNCTION(bfq_slice_idle_show, bfqd->bfq_slice_idle, 1);
-+SHOW_FUNCTION(bfq_max_budget_show, bfqd->bfq_user_max_budget, 0);
-+SHOW_FUNCTION(bfq_max_budget_async_rq_show, bfqd->bfq_max_budget_async_rq, 0);
-+SHOW_FUNCTION(bfq_timeout_sync_show, bfqd->bfq_timeout[BLK_RW_SYNC], 1);
-+SHOW_FUNCTION(bfq_timeout_async_show, bfqd->bfq_timeout[BLK_RW_ASYNC], 1);
-+SHOW_FUNCTION(bfq_low_latency_show, bfqd->low_latency, 0);
-+SHOW_FUNCTION(bfq_raising_coeff_show, bfqd->bfq_raising_coeff, 0);
-+SHOW_FUNCTION(bfq_raising_rt_max_time_show, bfqd->bfq_raising_rt_max_time, 1);
-+SHOW_FUNCTION(bfq_raising_min_idle_time_show, bfqd->bfq_raising_min_idle_time,
-+ 1);
-+SHOW_FUNCTION(bfq_raising_min_inter_arr_async_show,
-+ bfqd->bfq_raising_min_inter_arr_async,
-+ 1);
-+SHOW_FUNCTION(bfq_raising_max_softrt_rate_show,
-+ bfqd->bfq_raising_max_softrt_rate, 0);
-+#undef SHOW_FUNCTION
-+
-+#define STORE_FUNCTION(__FUNC, __PTR, MIN, MAX, __CONV) \
-+static ssize_t \
-+__FUNC(struct elevator_queue *e, const char *page, size_t count) \
-+{ \
-+ struct bfq_data *bfqd = e->elevator_data; \
-+ unsigned long uninitialized_var(__data); \
-+ int ret = bfq_var_store(&__data, (page), count); \
-+ if (__data < (MIN)) \
-+ __data = (MIN); \
-+ else if (__data > (MAX)) \
-+ __data = (MAX); \
-+ if (__CONV) \
-+ *(__PTR) = msecs_to_jiffies(__data); \
-+ else \
-+ *(__PTR) = __data; \
-+ return ret; \
-+}
-+STORE_FUNCTION(bfq_quantum_store, &bfqd->bfq_quantum, 1, INT_MAX, 0);
-+STORE_FUNCTION(bfq_fifo_expire_sync_store, &bfqd->bfq_fifo_expire[1], 1,
-+ INT_MAX, 1);
-+STORE_FUNCTION(bfq_fifo_expire_async_store, &bfqd->bfq_fifo_expire[0], 1,
-+ INT_MAX, 1);
-+STORE_FUNCTION(bfq_back_seek_max_store, &bfqd->bfq_back_max, 0, INT_MAX, 0);
-+STORE_FUNCTION(bfq_back_seek_penalty_store, &bfqd->bfq_back_penalty, 1,
-+ INT_MAX, 0);
-+STORE_FUNCTION(bfq_slice_idle_store, &bfqd->bfq_slice_idle, 0, INT_MAX, 1);
-+STORE_FUNCTION(bfq_max_budget_async_rq_store, &bfqd->bfq_max_budget_async_rq,
-+ 1, INT_MAX, 0);
-+STORE_FUNCTION(bfq_timeout_async_store, &bfqd->bfq_timeout[BLK_RW_ASYNC], 0,
-+ INT_MAX, 1);
-+STORE_FUNCTION(bfq_raising_coeff_store, &bfqd->bfq_raising_coeff, 1,
-+ INT_MAX, 0);
-+STORE_FUNCTION(bfq_raising_max_time_store, &bfqd->bfq_raising_max_time, 0,
-+ INT_MAX, 1);
-+STORE_FUNCTION(bfq_raising_rt_max_time_store, &bfqd->bfq_raising_rt_max_time, 0,
-+ INT_MAX, 1);
-+STORE_FUNCTION(bfq_raising_min_idle_time_store,
-+ &bfqd->bfq_raising_min_idle_time, 0, INT_MAX, 1);
-+STORE_FUNCTION(bfq_raising_min_inter_arr_async_store,
-+ &bfqd->bfq_raising_min_inter_arr_async, 0, INT_MAX, 1);
-+STORE_FUNCTION(bfq_raising_max_softrt_rate_store,
-+ &bfqd->bfq_raising_max_softrt_rate, 0, INT_MAX, 0);
-+#undef STORE_FUNCTION
-+
-+/* do nothing for the moment */
-+static ssize_t bfq_weights_store(struct elevator_queue *e,
-+ const char *page, size_t count)
-+{
-+ return count;
-+}
-+
-+static inline unsigned long bfq_estimated_max_budget(struct bfq_data *bfqd)
-+{
-+ u64 timeout = jiffies_to_msecs(bfqd->bfq_timeout[BLK_RW_SYNC]);
-+
-+ if (bfqd->peak_rate_samples >= BFQ_PEAK_RATE_SAMPLES)
-+ return bfq_calc_max_budget(bfqd->peak_rate, timeout);
-+ else
-+ return bfq_default_max_budget;
-+}
-+
-+static ssize_t bfq_max_budget_store(struct elevator_queue *e,
-+ const char *page, size_t count)
-+{
-+ struct bfq_data *bfqd = e->elevator_data;
-+ unsigned long uninitialized_var(__data);
-+ int ret = bfq_var_store(&__data, (page), count);
-+
-+ if (__data == 0)
-+ bfqd->bfq_max_budget = bfq_estimated_max_budget(bfqd);
-+ else {
-+ if (__data > INT_MAX)
-+ __data = INT_MAX;
-+ bfqd->bfq_max_budget = __data;
-+ }
-+
-+ bfqd->bfq_user_max_budget = __data;
-+
-+ return ret;
-+}
-+
-+static ssize_t bfq_timeout_sync_store(struct elevator_queue *e,
-+ const char *page, size_t count)
-+{
-+ struct bfq_data *bfqd = e->elevator_data;
-+ unsigned long uninitialized_var(__data);
-+ int ret = bfq_var_store(&__data, (page), count);
-+
-+ if (__data < 1)
-+ __data = 1;
-+ else if (__data > INT_MAX)
-+ __data = INT_MAX;
-+
-+ bfqd->bfq_timeout[BLK_RW_SYNC] = msecs_to_jiffies(__data);
-+ if (bfqd->bfq_user_max_budget == 0)
-+ bfqd->bfq_max_budget = bfq_estimated_max_budget(bfqd);
-+
-+ return ret;
-+}
-+
-+static ssize_t bfq_low_latency_store(struct elevator_queue *e,
-+ const char *page, size_t count)
-+{
-+ struct bfq_data *bfqd = e->elevator_data;
-+ unsigned long uninitialized_var(__data);
-+ int ret = bfq_var_store(&__data, (page), count);
-+
-+ if (__data > 1)
-+ __data = 1;
-+ if (__data == 0 && bfqd->low_latency != 0)
-+ bfq_end_raising(bfqd);
-+ bfqd->low_latency = __data;
-+
-+ return ret;
-+}
-+
-+#define BFQ_ATTR(name) \
-+ __ATTR(name, S_IRUGO|S_IWUSR, bfq_##name##_show, bfq_##name##_store)
-+
-+static struct elv_fs_entry bfq_attrs[] = {
-+ BFQ_ATTR(quantum),
-+ BFQ_ATTR(fifo_expire_sync),
-+ BFQ_ATTR(fifo_expire_async),
-+ BFQ_ATTR(back_seek_max),
-+ BFQ_ATTR(back_seek_penalty),
-+ BFQ_ATTR(slice_idle),
-+ BFQ_ATTR(max_budget),
-+ BFQ_ATTR(max_budget_async_rq),
-+ BFQ_ATTR(timeout_sync),
-+ BFQ_ATTR(timeout_async),
-+ BFQ_ATTR(low_latency),
-+ BFQ_ATTR(raising_coeff),
-+ BFQ_ATTR(raising_max_time),
-+ BFQ_ATTR(raising_rt_max_time),
-+ BFQ_ATTR(raising_min_idle_time),
-+ BFQ_ATTR(raising_min_inter_arr_async),
-+ BFQ_ATTR(raising_max_softrt_rate),
-+ BFQ_ATTR(weights),
-+ __ATTR_NULL
-+};
-+
-+static struct elevator_type iosched_bfq = {
-+ .ops = {
-+ .elevator_merge_fn = bfq_merge,
-+ .elevator_merged_fn = bfq_merged_request,
-+ .elevator_merge_req_fn = bfq_merged_requests,
-+ .elevator_allow_merge_fn = bfq_allow_merge,
-+ .elevator_dispatch_fn = bfq_dispatch_requests,
-+ .elevator_add_req_fn = bfq_insert_request,
-+ .elevator_activate_req_fn = bfq_activate_request,
-+ .elevator_deactivate_req_fn = bfq_deactivate_request,
-+ .elevator_completed_req_fn = bfq_completed_request,
-+ .elevator_former_req_fn = elv_rb_former_request,
-+ .elevator_latter_req_fn = elv_rb_latter_request,
-+ .elevator_init_icq_fn = bfq_init_icq,
-+ .elevator_exit_icq_fn = bfq_exit_icq,
-+ .elevator_set_req_fn = bfq_set_request,
-+ .elevator_put_req_fn = bfq_put_request,
-+ .elevator_may_queue_fn = bfq_may_queue,
-+ .elevator_init_fn = bfq_init_queue,
-+ .elevator_exit_fn = bfq_exit_queue,
-+ },
-+ .icq_size = sizeof(struct bfq_io_cq),
-+ .icq_align = __alignof__(struct bfq_io_cq),
-+ .elevator_attrs = bfq_attrs,
-+ .elevator_name = "bfq",
-+ .elevator_owner = THIS_MODULE,
-+};
-+
-+static int __init bfq_init(void)
-+{
-+ /*
-+ * Can be 0 on HZ < 1000 setups.
-+ */
-+ if (bfq_slice_idle == 0)
-+ bfq_slice_idle = 1;
-+
-+ if (bfq_timeout_async == 0)
-+ bfq_timeout_async = 1;
-+
-+ if (bfq_slab_setup())
-+ return -ENOMEM;
-+
-+ elv_register(&iosched_bfq);
-+ printk(KERN_INFO "BFQ I/O-scheduler version: v7");
-+
-+ return 0;
-+}
-+
-+static void __exit bfq_exit(void)
-+{
-+ elv_unregister(&iosched_bfq);
-+ bfq_slab_kill();
-+}
-+
-+module_init(bfq_init);
-+module_exit(bfq_exit);
-+
-+MODULE_AUTHOR("Fabio Checconi, Paolo Valente");
-+MODULE_LICENSE("GPL");
-+MODULE_DESCRIPTION("Budget Fair Queueing IO scheduler");
-diff --git a/block/bfq-sched.c b/block/bfq-sched.c
-new file mode 100644
-index 0000000..30df81c
---- /dev/null
-+++ b/block/bfq-sched.c
-@@ -0,0 +1,1077 @@
-+/*
-+ * BFQ: Hierarchical B-WF2Q+ scheduler.
-+ *
-+ * Based on ideas and code from CFQ:
-+ * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
-+ *
-+ * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
-+ * Paolo Valente <paolo.valente@unimore.it>
-+ *
-+ * Copyright (C) 2010 Paolo Valente <paolo.valente@unimore.it>
-+ */
-+
-+#ifdef CONFIG_CGROUP_BFQIO
-+#define for_each_entity(entity) \
-+ for (; entity != NULL; entity = entity->parent)
-+
-+#define for_each_entity_safe(entity, parent) \
-+ for (; entity && ({ parent = entity->parent; 1; }); entity = parent)
-+
-+static struct bfq_entity *bfq_lookup_next_entity(struct bfq_sched_data *sd,
-+ int extract,
-+ struct bfq_data *bfqd);
-+
-+static inline void bfq_update_budget(struct bfq_entity *next_active)
-+{
-+ struct bfq_entity *bfqg_entity;
-+ struct bfq_group *bfqg;
-+ struct bfq_sched_data *group_sd;
-+
-+ BUG_ON(next_active == NULL);
-+
-+ group_sd = next_active->sched_data;
-+
-+ bfqg = container_of(group_sd, struct bfq_group, sched_data);
-+ /*
-+ * bfq_group's my_entity field is not NULL only if the group
-+ * is not the root group. We must not touch the root entity
-+ * as it must never become an active entity.
-+ */
-+ bfqg_entity = bfqg->my_entity;
-+ if (bfqg_entity != NULL)
-+ bfqg_entity->budget = next_active->budget;
-+}
-+
-+static int bfq_update_next_active(struct bfq_sched_data *sd)
-+{
-+ struct bfq_entity *next_active;
-+
-+ if (sd->active_entity != NULL)
-+ /* will update/requeue at the end of service */
-+ return 0;
-+
-+ /*
-+ * NOTE: this can be improved in many ways, such as returning
-+ * 1 (and thus propagating upwards the update) only when the
-+ * budget changes, or caching the bfqq that will be scheduled
-+ * next from this subtree. By now we worry more about
-+ * correctness than about performance...
-+ */
-+ next_active = bfq_lookup_next_entity(sd, 0, NULL);
-+ sd->next_active = next_active;
-+
-+ if (next_active != NULL)
-+ bfq_update_budget(next_active);
-+
-+ return 1;
-+}
-+
-+static inline void bfq_check_next_active(struct bfq_sched_data *sd,
-+ struct bfq_entity *entity)
-+{
-+ BUG_ON(sd->next_active != entity);
-+}
-+#else
-+#define for_each_entity(entity) \
-+ for (; entity != NULL; entity = NULL)
-+
-+#define for_each_entity_safe(entity, parent) \
-+ for (parent = NULL; entity != NULL; entity = parent)
-+
-+static inline int bfq_update_next_active(struct bfq_sched_data *sd)
-+{
-+ return 0;
-+}
-+
-+static inline void bfq_check_next_active(struct bfq_sched_data *sd,
-+ struct bfq_entity *entity)
-+{
-+}
-+
-+static inline void bfq_update_budget(struct bfq_entity *next_active)
-+{
-+}
-+#endif
-+
-+/*
-+ * Shift for timestamp calculations. This actually limits the maximum
-+ * service allowed in one timestamp delta (small shift values increase it),
-+ * the maximum total weight that can be used for the queues in the system
-+ * (big shift values increase it), and the period of virtual time wraparounds.
-+ */
-+#define WFQ_SERVICE_SHIFT 22
-+
-+/**
-+ * bfq_gt - compare two timestamps.
-+ * @a: first ts.
-+ * @b: second ts.
-+ *
-+ * Return @a > @b, dealing with wrapping correctly.
-+ */
-+static inline int bfq_gt(u64 a, u64 b)
-+{
-+ return (s64)(a - b) > 0;
-+}
-+
-+static inline struct bfq_queue *bfq_entity_to_bfqq(struct bfq_entity *entity)
-+{
-+ struct bfq_queue *bfqq = NULL;
-+
-+ BUG_ON(entity == NULL);
-+
-+ if (entity->my_sched_data == NULL)
-+ bfqq = container_of(entity, struct bfq_queue, entity);
-+
-+ return bfqq;
-+}
-+
-+
-+/**
-+ * bfq_delta - map service into the virtual time domain.
-+ * @service: amount of service.
-+ * @weight: scale factor (weight of an entity or weight sum).
-+ */
-+static inline u64 bfq_delta(unsigned long service,
-+ unsigned long weight)
-+{
-+ u64 d = (u64)service << WFQ_SERVICE_SHIFT;
-+
-+ do_div(d, weight);
-+ return d;
-+}
-+
-+/**
-+ * bfq_calc_finish - assign the finish time to an entity.
-+ * @entity: the entity to act upon.
-+ * @service: the service to be charged to the entity.
-+ */
-+static inline void bfq_calc_finish(struct bfq_entity *entity,
-+ unsigned long service)
-+{
-+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
-+
-+ BUG_ON(entity->weight == 0);
-+
-+ entity->finish = entity->start +
-+ bfq_delta(service, entity->weight);
-+
-+ if (bfqq != NULL) {
-+ bfq_log_bfqq(bfqq->bfqd, bfqq,
-+ "calc_finish: serv %lu, w %d",
-+ service, entity->weight);
-+ bfq_log_bfqq(bfqq->bfqd, bfqq,
-+ "calc_finish: start %llu, finish %llu, delta %llu",
-+ entity->start, entity->finish,
-+ bfq_delta(service, entity->weight));
-+ }
-+}
-+
-+/**
-+ * bfq_entity_of - get an entity from a node.
-+ * @node: the node field of the entity.
-+ *
-+ * Convert a node pointer to the relative entity. This is used only
-+ * to simplify the logic of some functions and not as the generic
-+ * conversion mechanism because, e.g., in the tree walking functions,
-+ * the check for a %NULL value would be redundant.
-+ */
-+static inline struct bfq_entity *bfq_entity_of(struct rb_node *node)
-+{
-+ struct bfq_entity *entity = NULL;
-+
-+ if (node != NULL)
-+ entity = rb_entry(node, struct bfq_entity, rb_node);
-+
-+ return entity;
-+}
-+
-+/**
-+ * bfq_extract - remove an entity from a tree.
-+ * @root: the tree root.
-+ * @entity: the entity to remove.
-+ */
-+static inline void bfq_extract(struct rb_root *root,
-+ struct bfq_entity *entity)
-+{
-+ BUG_ON(entity->tree != root);
-+
-+ entity->tree = NULL;
-+ rb_erase(&entity->rb_node, root);
-+}
-+
-+/**
-+ * bfq_idle_extract - extract an entity from the idle tree.
-+ * @st: the service tree of the owning @entity.
-+ * @entity: the entity being removed.
-+ */
-+static void bfq_idle_extract(struct bfq_service_tree *st,
-+ struct bfq_entity *entity)
-+{
-+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
-+ struct rb_node *next;
-+
-+ BUG_ON(entity->tree != &st->idle);
-+
-+ if (entity == st->first_idle) {
-+ next = rb_next(&entity->rb_node);
-+ st->first_idle = bfq_entity_of(next);
-+ }
-+
-+ if (entity == st->last_idle) {
-+ next = rb_prev(&entity->rb_node);
-+ st->last_idle = bfq_entity_of(next);
-+ }
-+
-+ bfq_extract(&st->idle, entity);
-+
-+ if (bfqq != NULL)
-+ list_del(&bfqq->bfqq_list);
-+}
-+
-+/**
-+ * bfq_insert - generic tree insertion.
-+ * @root: tree root.
-+ * @entity: entity to insert.
-+ *
-+ * This is used for the idle and the active tree, since they are both
-+ * ordered by finish time.
-+ */
-+static void bfq_insert(struct rb_root *root, struct bfq_entity *entity)
-+{
-+ struct bfq_entity *entry;
-+ struct rb_node **node = &root->rb_node;
-+ struct rb_node *parent = NULL;
-+
-+ BUG_ON(entity->tree != NULL);
-+
-+ while (*node != NULL) {
-+ parent = *node;
-+ entry = rb_entry(parent, struct bfq_entity, rb_node);
-+
-+ if (bfq_gt(entry->finish, entity->finish))
-+ node = &parent->rb_left;
-+ else
-+ node = &parent->rb_right;
-+ }
-+
-+ rb_link_node(&entity->rb_node, parent, node);
-+ rb_insert_color(&entity->rb_node, root);
-+
-+ entity->tree = root;
-+}
-+
-+/**
-+ * bfq_update_min - update the min_start field of a entity.
-+ * @entity: the entity to update.
-+ * @node: one of its children.
-+ *
-+ * This function is called when @entity may store an invalid value for
-+ * min_start due to updates to the active tree. The function assumes
-+ * that the subtree rooted at @node (which may be its left or its right
-+ * child) has a valid min_start value.
-+ */
-+static inline void bfq_update_min(struct bfq_entity *entity,
-+ struct rb_node *node)
-+{
-+ struct bfq_entity *child;
-+
-+ if (node != NULL) {
-+ child = rb_entry(node, struct bfq_entity, rb_node);
-+ if (bfq_gt(entity->min_start, child->min_start))
-+ entity->min_start = child->min_start;
-+ }
-+}
-+
-+/**
-+ * bfq_update_active_node - recalculate min_start.
-+ * @node: the node to update.
-+ *
-+ * @node may have changed position or one of its children may have moved,
-+ * this function updates its min_start value. The left and right subtrees
-+ * are assumed to hold a correct min_start value.
-+ */
-+static inline void bfq_update_active_node(struct rb_node *node)
-+{
-+ struct bfq_entity *entity = rb_entry(node, struct bfq_entity, rb_node);
-+
-+ entity->min_start = entity->start;
-+ bfq_update_min(entity, node->rb_right);
-+ bfq_update_min(entity, node->rb_left);
-+}
-+
-+/**
-+ * bfq_update_active_tree - update min_start for the whole active tree.
-+ * @node: the starting node.
-+ *
-+ * @node must be the deepest modified node after an update. This function
-+ * updates its min_start using the values held by its children, assuming
-+ * that they did not change, and then updates all the nodes that may have
-+ * changed in the path to the root. The only nodes that may have changed
-+ * are the ones in the path or their siblings.
-+ */
-+static void bfq_update_active_tree(struct rb_node *node)
-+{
-+ struct rb_node *parent;
-+
-+up:
-+ bfq_update_active_node(node);
-+
-+ parent = rb_parent(node);
-+ if (parent == NULL)
-+ return;
-+
-+ if (node == parent->rb_left && parent->rb_right != NULL)
-+ bfq_update_active_node(parent->rb_right);
-+ else if (parent->rb_left != NULL)
-+ bfq_update_active_node(parent->rb_left);
-+
-+ node = parent;
-+ goto up;
-+}
-+
-+/**
-+ * bfq_active_insert - insert an entity in the active tree of its group/device.
-+ * @st: the service tree of the entity.
-+ * @entity: the entity being inserted.
-+ *
-+ * The active tree is ordered by finish time, but an extra key is kept
-+ * per each node, containing the minimum value for the start times of
-+ * its children (and the node itself), so it's possible to search for
-+ * the eligible node with the lowest finish time in logarithmic time.
-+ */
-+static void bfq_active_insert(struct bfq_service_tree *st,
-+ struct bfq_entity *entity)
-+{
-+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
-+ struct rb_node *node = &entity->rb_node;
-+
-+ bfq_insert(&st->active, entity);
-+
-+ if (node->rb_left != NULL)
-+ node = node->rb_left;
-+ else if (node->rb_right != NULL)
-+ node = node->rb_right;
-+
-+ bfq_update_active_tree(node);
-+
-+ if (bfqq != NULL)
-+ list_add(&bfqq->bfqq_list, &bfqq->bfqd->active_list);
-+}
-+
-+/**
-+ * bfq_ioprio_to_weight - calc a weight from an ioprio.
-+ * @ioprio: the ioprio value to convert.
-+ */
-+static unsigned short bfq_ioprio_to_weight(int ioprio)
-+{
-+ WARN_ON(ioprio < 0 || ioprio >= IOPRIO_BE_NR);
-+ return IOPRIO_BE_NR - ioprio;
-+}
-+
-+/**
-+ * bfq_weight_to_ioprio - calc an ioprio from a weight.
-+ * @weight: the weight value to convert.
-+ *
-+ * To preserve as mush as possible the old only-ioprio user interface,
-+ * 0 is used as an escape ioprio value for weights (numerically) equal or
-+ * larger than IOPRIO_BE_NR
-+ */
-+static unsigned short bfq_weight_to_ioprio(int weight)
-+{
-+ WARN_ON(weight < BFQ_MIN_WEIGHT || weight > BFQ_MAX_WEIGHT);
-+ return IOPRIO_BE_NR - weight < 0 ? 0 : IOPRIO_BE_NR - weight;
-+}
-+
-+static inline void bfq_get_entity(struct bfq_entity *entity)
-+{
-+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
-+ struct bfq_sched_data *sd;
-+
-+ if (bfqq != NULL) {
-+ sd = entity->sched_data;
-+ atomic_inc(&bfqq->ref);
-+ bfq_log_bfqq(bfqq->bfqd, bfqq, "get_entity: %p %d",
-+ bfqq, atomic_read(&bfqq->ref));
-+ }
-+}
-+
-+/**
-+ * bfq_find_deepest - find the deepest node that an extraction can modify.
-+ * @node: the node being removed.
-+ *
-+ * Do the first step of an extraction in an rb tree, looking for the
-+ * node that will replace @node, and returning the deepest node that
-+ * the following modifications to the tree can touch. If @node is the
-+ * last node in the tree return %NULL.
-+ */
-+static struct rb_node *bfq_find_deepest(struct rb_node *node)
-+{
-+ struct rb_node *deepest;
-+
-+ if (node->rb_right == NULL && node->rb_left == NULL)
-+ deepest = rb_parent(node);
-+ else if (node->rb_right == NULL)
-+ deepest = node->rb_left;
-+ else if (node->rb_left == NULL)
-+ deepest = node->rb_right;
-+ else {
-+ deepest = rb_next(node);
-+ if (deepest->rb_right != NULL)
-+ deepest = deepest->rb_right;
-+ else if (rb_parent(deepest) != node)
-+ deepest = rb_parent(deepest);
-+ }
-+
-+ return deepest;
-+}
-+
-+/**
-+ * bfq_active_extract - remove an entity from the active tree.
-+ * @st: the service_tree containing the tree.
-+ * @entity: the entity being removed.
-+ */
-+static void bfq_active_extract(struct bfq_service_tree *st,
-+ struct bfq_entity *entity)
-+{
-+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
-+ struct rb_node *node;
-+
-+ node = bfq_find_deepest(&entity->rb_node);
-+ bfq_extract(&st->active, entity);
-+
-+ if (node != NULL)
-+ bfq_update_active_tree(node);
-+
-+ if (bfqq != NULL)
-+ list_del(&bfqq->bfqq_list);
-+}
-+
-+/**
-+ * bfq_idle_insert - insert an entity into the idle tree.
-+ * @st: the service tree containing the tree.
-+ * @entity: the entity to insert.
-+ */
-+static void bfq_idle_insert(struct bfq_service_tree *st,
-+ struct bfq_entity *entity)
-+{
-+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
-+ struct bfq_entity *first_idle = st->first_idle;
-+ struct bfq_entity *last_idle = st->last_idle;
-+
-+ if (first_idle == NULL || bfq_gt(first_idle->finish, entity->finish))
-+ st->first_idle = entity;
-+ if (last_idle == NULL || bfq_gt(entity->finish, last_idle->finish))
-+ st->last_idle = entity;
-+
-+ bfq_insert(&st->idle, entity);
-+
-+ if (bfqq != NULL)
-+ list_add(&bfqq->bfqq_list, &bfqq->bfqd->idle_list);
-+}
-+
-+/**
-+ * bfq_forget_entity - remove an entity from the wfq trees.
-+ * @st: the service tree.
-+ * @entity: the entity being removed.
-+ *
-+ * Update the device status and forget everything about @entity, putting
-+ * the device reference to it, if it is a queue. Entities belonging to
-+ * groups are not refcounted.
-+ */
-+static void bfq_forget_entity(struct bfq_service_tree *st,
-+ struct bfq_entity *entity)
-+{
-+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
-+ struct bfq_sched_data *sd;
-+
-+ BUG_ON(!entity->on_st);
-+
-+ entity->on_st = 0;
-+ st->wsum -= entity->weight;
-+ if (bfqq != NULL) {
-+ sd = entity->sched_data;
-+ bfq_log_bfqq(bfqq->bfqd, bfqq, "forget_entity: %p %d",
-+ bfqq, atomic_read(&bfqq->ref));
-+ bfq_put_queue(bfqq);
-+ }
-+}
-+
-+/**
-+ * bfq_put_idle_entity - release the idle tree ref of an entity.
-+ * @st: service tree for the entity.
-+ * @entity: the entity being released.
-+ */
-+static void bfq_put_idle_entity(struct bfq_service_tree *st,
-+ struct bfq_entity *entity)
-+{
-+ bfq_idle_extract(st, entity);
-+ bfq_forget_entity(st, entity);
-+}
-+
-+/**
-+ * bfq_forget_idle - update the idle tree if necessary.
-+ * @st: the service tree to act upon.
-+ *
-+ * To preserve the global O(log N) complexity we only remove one entry here;
-+ * as the idle tree will not grow indefinitely this can be done safely.
-+ */
-+static void bfq_forget_idle(struct bfq_service_tree *st)
-+{
-+ struct bfq_entity *first_idle = st->first_idle;
-+ struct bfq_entity *last_idle = st->last_idle;
-+
-+ if (RB_EMPTY_ROOT(&st->active) && last_idle != NULL &&
-+ !bfq_gt(last_idle->finish, st->vtime)) {
-+ /*
-+ * Forget the whole idle tree, increasing the vtime past
-+ * the last finish time of idle entities.
-+ */
-+ st->vtime = last_idle->finish;
-+ }
-+
-+ if (first_idle != NULL && !bfq_gt(first_idle->finish, st->vtime))
-+ bfq_put_idle_entity(st, first_idle);
-+}
-+
-+static struct bfq_service_tree *
-+__bfq_entity_update_weight_prio(struct bfq_service_tree *old_st,
-+ struct bfq_entity *entity)
-+{
-+ struct bfq_service_tree *new_st = old_st;
-+
-+ if (entity->ioprio_changed) {
-+ struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity);
-+
-+ BUG_ON(old_st->wsum < entity->weight);
-+ old_st->wsum -= entity->weight;
-+
-+ if (entity->new_weight != entity->orig_weight) {
-+ entity->orig_weight = entity->new_weight;
-+ entity->ioprio =
-+ bfq_weight_to_ioprio(entity->orig_weight);
-+ } else if (entity->new_ioprio != entity->ioprio) {
-+ entity->ioprio = entity->new_ioprio;
-+ entity->orig_weight =
-+ bfq_ioprio_to_weight(entity->ioprio);
-+ } else
-+ entity->new_weight = entity->orig_weight =
-+ bfq_ioprio_to_weight(entity->ioprio);
-+
-+ entity->ioprio_class = entity->new_ioprio_class;
-+ entity->ioprio_changed = 0;
-+
-+ /*
-+ * NOTE: here we may be changing the weight too early,
-+ * this will cause unfairness. The correct approach
-+ * would have required additional complexity to defer
-+ * weight changes to the proper time instants (i.e.,
-+ * when entity->finish <= old_st->vtime).
-+ */
-+ new_st = bfq_entity_service_tree(entity);
-+ entity->weight = entity->orig_weight *
-+ (bfqq != NULL ? bfqq->raising_coeff : 1);
-+ new_st->wsum += entity->weight;
-+
-+ if (new_st != old_st)
-+ entity->start = new_st->vtime;
-+ }
-+
-+ return new_st;
-+}
-+
-+/**
-+ * bfq_bfqq_served - update the scheduler status after selection for service.
-+ * @bfqq: the queue being served.
-+ * @served: bytes to transfer.
-+ *
-+ * NOTE: this can be optimized, as the timestamps of upper level entities
-+ * are synchronized every time a new bfqq is selected for service. By now,
-+ * we keep it to better check consistency.
-+ */
-+static void bfq_bfqq_served(struct bfq_queue *bfqq, unsigned long served)
-+{
-+ struct bfq_entity *entity = &bfqq->entity;
-+ struct bfq_service_tree *st;
-+
-+ for_each_entity(entity) {
-+ st = bfq_entity_service_tree(entity);
-+
-+ entity->service += served;
-+ BUG_ON(entity->service > entity->budget);
-+ BUG_ON(st->wsum == 0);
-+
-+ st->vtime += bfq_delta(served, st->wsum);
-+ bfq_forget_idle(st);
-+ }
-+ bfq_log_bfqq(bfqq->bfqd, bfqq, "bfqq_served %lu secs", served);
-+}
-+
-+/**
-+ * bfq_bfqq_charge_full_budget - set the service to the entity budget.
-+ * @bfqq: the queue that needs a service update.
-+ *
-+ * When it's not possible to be fair in the service domain, because
-+ * a queue is not consuming its budget fast enough (the meaning of
-+ * fast depends on the timeout parameter), we charge it a full
-+ * budget. In this way we should obtain a sort of time-domain
-+ * fairness among all the seeky/slow queues.
-+ */
-+static inline void bfq_bfqq_charge_full_budget(struct bfq_queue *bfqq)
-+{
-+ struct bfq_entity *entity = &bfqq->entity;
-+
-+ bfq_log_bfqq(bfqq->bfqd, bfqq, "charge_full_budget");
-+
-+ bfq_bfqq_served(bfqq, entity->budget - entity->service);
-+}
-+
-+/**
-+ * __bfq_activate_entity - activate an entity.
-+ * @entity: the entity being activated.
-+ *
-+ * Called whenever an entity is activated, i.e., it is not active and one
-+ * of its children receives a new request, or has to be reactivated due to
-+ * budget exhaustion. It uses the current budget of the entity (and the
-+ * service received if @entity is active) of the queue to calculate its
-+ * timestamps.
-+ */
-+static void __bfq_activate_entity(struct bfq_entity *entity)
-+{
-+ struct bfq_sched_data *sd = entity->sched_data;
-+ struct bfq_service_tree *st = bfq_entity_service_tree(entity);
-+
-+ if (entity == sd->active_entity) {
-+ BUG_ON(entity->tree != NULL);
-+ /*
-+ * If we are requeueing the current entity we have
-+ * to take care of not charging to it service it has
-+ * not received.
-+ */
-+ bfq_calc_finish(entity, entity->service);
-+ entity->start = entity->finish;
-+ sd->active_entity = NULL;
-+ } else if (entity->tree == &st->active) {
-+ /*
-+ * Requeueing an entity due to a change of some
-+ * next_active entity below it. We reuse the old
-+ * start time.
-+ */
-+ bfq_active_extract(st, entity);
-+ } else if (entity->tree == &st->idle) {
-+ /*
-+ * Must be on the idle tree, bfq_idle_extract() will
-+ * check for that.
-+ */
-+ bfq_idle_extract(st, entity);
-+ entity->start = bfq_gt(st->vtime, entity->finish) ?
-+ st->vtime : entity->finish;
-+ } else {
-+ /*
-+ * The finish time of the entity may be invalid, and
-+ * it is in the past for sure, otherwise the queue
-+ * would have been on the idle tree.
-+ */
-+ entity->start = st->vtime;
-+ st->wsum += entity->weight;
-+ bfq_get_entity(entity);
-+
-+ BUG_ON(entity->on_st);
-+ entity->on_st = 1;
-+ }
-+
-+ st = __bfq_entity_update_weight_prio(st, entity);
-+ bfq_calc_finish(entity, entity->budget);
-+ bfq_active_insert(st, entity);
-+}
-+
-+/**
-+ * bfq_activate_entity - activate an entity and its ancestors if necessary.
-+ * @entity: the entity to activate.
-+ *
-+ * Activate @entity and all the entities on the path from it to the root.
-+ */
-+static void bfq_activate_entity(struct bfq_entity *entity)
-+{
-+ struct bfq_sched_data *sd;
-+
-+ for_each_entity(entity) {
-+ __bfq_activate_entity(entity);
-+
-+ sd = entity->sched_data;
-+ if (!bfq_update_next_active(sd))
-+ /*
-+ * No need to propagate the activation to the
-+ * upper entities, as they will be updated when
-+ * the active entity is rescheduled.
-+ */
-+ break;
-+ }
-+}
-+
-+/**
-+ * __bfq_deactivate_entity - deactivate an entity from its service tree.
-+ * @entity: the entity to deactivate.
-+ * @requeue: if false, the entity will not be put into the idle tree.
-+ *
-+ * Deactivate an entity, independently from its previous state. If the
-+ * entity was not on a service tree just return, otherwise if it is on
-+ * any scheduler tree, extract it from that tree, and if necessary
-+ * and if the caller did not specify @requeue, put it on the idle tree.
-+ *
-+ * Return %1 if the caller should update the entity hierarchy, i.e.,
-+ * if the entity was under service or if it was the next_active for
-+ * its sched_data; return %0 otherwise.
-+ */
-+static int __bfq_deactivate_entity(struct bfq_entity *entity, int requeue)
-+{
-+ struct bfq_sched_data *sd = entity->sched_data;
-+ struct bfq_service_tree *st = bfq_entity_service_tree(entity);
-+ int was_active = entity == sd->active_entity;
-+ int ret = 0;
-+
-+ if (!entity->on_st)
-+ return 0;
-+
-+ BUG_ON(was_active && entity->tree != NULL);
-+
-+ if (was_active) {
-+ bfq_calc_finish(entity, entity->service);
-+ sd->active_entity = NULL;
-+ } else if (entity->tree == &st->active)
-+ bfq_active_extract(st, entity);
-+ else if (entity->tree == &st->idle)
-+ bfq_idle_extract(st, entity);
-+ else if (entity->tree != NULL)
-+ BUG();
-+
-+ if (was_active || sd->next_active == entity)
-+ ret = bfq_update_next_active(sd);
-+
-+ if (!requeue || !bfq_gt(entity->finish, st->vtime))
-+ bfq_forget_entity(st, entity);
-+ else
-+ bfq_idle_insert(st, entity);
-+
-+ BUG_ON(sd->active_entity == entity);
-+ BUG_ON(sd->next_active == entity);
-+
-+ return ret;
-+}
-+
-+/**
-+ * bfq_deactivate_entity - deactivate an entity.
-+ * @entity: the entity to deactivate.
-+ * @requeue: true if the entity can be put on the idle tree
-+ */
-+static void bfq_deactivate_entity(struct bfq_entity *entity, int requeue)
-+{
-+ struct bfq_sched_data *sd;
-+ struct bfq_entity *parent;
-+
-+ for_each_entity_safe(entity, parent) {
-+ sd = entity->sched_data;
-+
-+ if (!__bfq_deactivate_entity(entity, requeue))
-+ /*
-+ * The parent entity is still backlogged, and
-+ * we don't need to update it as it is still
-+ * under service.
-+ */
-+ break;
-+
-+ if (sd->next_active != NULL)
-+ /*
-+ * The parent entity is still backlogged and
-+ * the budgets on the path towards the root
-+ * need to be updated.
-+ */
-+ goto update;
-+
-+ /*
-+ * If we reach there the parent is no more backlogged and
-+ * we want to propagate the dequeue upwards.
-+ */
-+ requeue = 1;
-+ }
-+
-+ return;
-+
-+update:
-+ entity = parent;
-+ for_each_entity(entity) {
-+ __bfq_activate_entity(entity);
-+
-+ sd = entity->sched_data;
-+ if (!bfq_update_next_active(sd))
-+ break;
-+ }
-+}
-+
-+/**
-+ * bfq_update_vtime - update vtime if necessary.
-+ * @st: the service tree to act upon.
-+ *
-+ * If necessary update the service tree vtime to have at least one
-+ * eligible entity, skipping to its start time. Assumes that the
-+ * active tree of the device is not empty.
-+ *
-+ * NOTE: this hierarchical implementation updates vtimes quite often,
-+ * we may end up with reactivated tasks getting timestamps after a
-+ * vtime skip done because we needed a ->first_active entity on some
-+ * intermediate node.
-+ */
-+static void bfq_update_vtime(struct bfq_service_tree *st)
-+{
-+ struct bfq_entity *entry;
-+ struct rb_node *node = st->active.rb_node;
-+
-+ entry = rb_entry(node, struct bfq_entity, rb_node);
-+ if (bfq_gt(entry->min_start, st->vtime)) {
-+ st->vtime = entry->min_start;
-+ bfq_forget_idle(st);
-+ }
-+}
-+
-+/**
-+ * bfq_first_active - find the eligible entity with the smallest finish time
-+ * @st: the service tree to select from.
-+ *
-+ * This function searches the first schedulable entity, starting from the
-+ * root of the tree and going on the left every time on this side there is
-+ * a subtree with at least one eligible (start >= vtime) entity. The path
-+ * on the right is followed only if a) the left subtree contains no eligible
-+ * entities and b) no eligible entity has been found yet.
-+ */
-+static struct bfq_entity *bfq_first_active_entity(struct bfq_service_tree *st)
-+{
-+ struct bfq_entity *entry, *first = NULL;
-+ struct rb_node *node = st->active.rb_node;
-+
-+ while (node != NULL) {
-+ entry = rb_entry(node, struct bfq_entity, rb_node);
-+left:
-+ if (!bfq_gt(entry->start, st->vtime))
-+ first = entry;
-+
-+ BUG_ON(bfq_gt(entry->min_start, st->vtime));
-+
-+ if (node->rb_left != NULL) {
-+ entry = rb_entry(node->rb_left,
-+ struct bfq_entity, rb_node);
-+ if (!bfq_gt(entry->min_start, st->vtime)) {
-+ node = node->rb_left;
-+ goto left;
-+ }
-+ }
-+ if (first != NULL)
-+ break;
-+ node = node->rb_right;
-+ }
-+
-+ BUG_ON(first == NULL && !RB_EMPTY_ROOT(&st->active));
-+ return first;
-+}
-+
-+/**
-+ * __bfq_lookup_next_entity - return the first eligible entity in @st.
-+ * @st: the service tree.
-+ *
-+ * Update the virtual time in @st and return the first eligible entity
-+ * it contains.
-+ */
-+static struct bfq_entity *__bfq_lookup_next_entity(struct bfq_service_tree *st,
-+ bool force)
-+{
-+ struct bfq_entity *entity, *new_next_active = NULL;
-+
-+ if (RB_EMPTY_ROOT(&st->active))
-+ return NULL;
-+
-+ bfq_update_vtime(st);
-+ entity = bfq_first_active_entity(st);
-+ BUG_ON(bfq_gt(entity->start, st->vtime));
-+
-+ /*
-+ * If the chosen entity does not match with the sched_data's
-+ * next_active and we are forcedly serving the IDLE priority
-+ * class tree, bubble up budget update.
-+ */
-+ if (unlikely(force && entity != entity->sched_data->next_active)) {
-+ new_next_active = entity;
-+ for_each_entity(new_next_active)
-+ bfq_update_budget(new_next_active);
-+ }
-+
-+ return entity;
-+}
-+
-+/**
-+ * bfq_lookup_next_entity - return the first eligible entity in @sd.
-+ * @sd: the sched_data.
-+ * @extract: if true the returned entity will be also extracted from @sd.
-+ *
-+ * NOTE: since we cache the next_active entity at each level of the
-+ * hierarchy, the complexity of the lookup can be decreased with
-+ * absolutely no effort just returning the cached next_active value;
-+ * we prefer to do full lookups to test the consistency of * the data
-+ * structures.
-+ */
-+static struct bfq_entity *bfq_lookup_next_entity(struct bfq_sched_data *sd,
-+ int extract,
-+ struct bfq_data *bfqd)
-+{
-+ struct bfq_service_tree *st = sd->service_tree;
-+ struct bfq_entity *entity;
-+ int i = 0;
-+
-+ BUG_ON(sd->active_entity != NULL);
-+
-+ if (bfqd != NULL &&
-+ jiffies - bfqd->bfq_class_idle_last_service > BFQ_CL_IDLE_TIMEOUT) {
-+ entity = __bfq_lookup_next_entity(st + BFQ_IOPRIO_CLASSES - 1,
-+ true);
-+ if (entity != NULL) {
-+ i = BFQ_IOPRIO_CLASSES - 1;
-+ bfqd->bfq_class_idle_last_service = jiffies;
-+ sd->next_active = entity;
-+ }
-+ }
-+ for (; i < BFQ_IOPRIO_CLASSES; i++) {
-+ entity = __bfq_lookup_next_entity(st + i, false);
-+ if (entity != NULL) {
-+ if (extract) {
-+ bfq_check_next_active(sd, entity);
-+ bfq_active_extract(st + i, entity);
-+ sd->active_entity = entity;
-+ sd->next_active = NULL;
-+ }
-+ break;
-+ }
-+ }
-+
-+ return entity;
-+}
-+
-+/*
-+ * Get next queue for service.
-+ */
-+static struct bfq_queue *bfq_get_next_queue(struct bfq_data *bfqd)
-+{
-+ struct bfq_entity *entity = NULL;
-+ struct bfq_sched_data *sd;
-+ struct bfq_queue *bfqq;
-+
-+ BUG_ON(bfqd->in_service_queue != NULL);
-+
-+ if (bfqd->busy_queues == 0)
-+ return NULL;
-+
-+ sd = &bfqd->root_group->sched_data;
-+ for (; sd != NULL; sd = entity->my_sched_data) {
-+ entity = bfq_lookup_next_entity(sd, 1, bfqd);
-+ BUG_ON(entity == NULL);
-+ entity->service = 0;
-+ }
-+
-+ bfqq = bfq_entity_to_bfqq(entity);
-+ BUG_ON(bfqq == NULL);
-+
-+ return bfqq;
-+}
-+
-+/*
-+ * Forced extraction of the given queue.
-+ */
-+static void bfq_get_next_queue_forced(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq)
-+{
-+ struct bfq_entity *entity;
-+ struct bfq_sched_data *sd;
-+
-+ BUG_ON(bfqd->in_service_queue != NULL);
-+
-+ entity = &bfqq->entity;
-+ /*
-+ * Bubble up extraction/update from the leaf to the root.
-+ */
-+ for_each_entity(entity) {
-+ sd = entity->sched_data;
-+ bfq_update_budget(entity);
-+ bfq_update_vtime(bfq_entity_service_tree(entity));
-+ bfq_active_extract(bfq_entity_service_tree(entity), entity);
-+ sd->active_entity = entity;
-+ sd->next_active = NULL;
-+ entity->service = 0;
-+ }
-+
-+ return;
-+}
-+
-+static void __bfq_bfqd_reset_in_service(struct bfq_data *bfqd)
-+{
-+ if (bfqd->in_service_bic != NULL) {
-+ put_io_context(bfqd->in_service_bic->icq.ioc);
-+ bfqd->in_service_bic = NULL;
-+ }
-+
-+ bfqd->in_service_queue = NULL;
-+ del_timer(&bfqd->idle_slice_timer);
-+}
-+
-+static void bfq_deactivate_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq,
-+ int requeue)
-+{
-+ struct bfq_entity *entity = &bfqq->entity;
-+
-+ if (bfqq == bfqd->in_service_queue)
-+ __bfq_bfqd_reset_in_service(bfqd);
-+
-+ bfq_deactivate_entity(entity, requeue);
-+}
-+
-+static void bfq_activate_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq)
-+{
-+ struct bfq_entity *entity = &bfqq->entity;
-+
-+ bfq_activate_entity(entity);
-+}
-+
-+/*
-+ * Called when the bfqq no longer has requests pending, remove it from
-+ * the service tree.
-+ */
-+static void bfq_del_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq,
-+ int requeue)
-+{
-+ BUG_ON(!bfq_bfqq_busy(bfqq));
-+ BUG_ON(!RB_EMPTY_ROOT(&bfqq->sort_list));
-+
-+ bfq_log_bfqq(bfqd, bfqq, "del from busy");
-+
-+ bfq_clear_bfqq_busy(bfqq);
-+
-+ BUG_ON(bfqd->busy_queues == 0);
-+ bfqd->busy_queues--;
-+ if (bfqq->raising_coeff > 1)
-+ bfqd->raised_busy_queues--;
-+
-+ bfq_deactivate_bfqq(bfqd, bfqq, requeue);
-+}
-+
-+/*
-+ * Called when an inactive queue receives a new request.
-+ */
-+static void bfq_add_bfqq_busy(struct bfq_data *bfqd, struct bfq_queue *bfqq)
-+{
-+ BUG_ON(bfq_bfqq_busy(bfqq));
-+ BUG_ON(bfqq == bfqd->in_service_queue);
-+
-+ bfq_log_bfqq(bfqd, bfqq, "add to busy");
-+
-+ bfq_activate_bfqq(bfqd, bfqq);
-+
-+ bfq_mark_bfqq_busy(bfqq);
-+ bfqd->busy_queues++;
-+ if (bfqq->raising_coeff > 1)
-+ bfqd->raised_busy_queues++;
-+}
-diff --git a/block/bfq.h b/block/bfq.h
-new file mode 100644
-index 0000000..78da7d2
---- /dev/null
-+++ b/block/bfq.h
-@@ -0,0 +1,612 @@
-+/*
-+ * BFQ-v7 for 3.10.0: data structures and common functions prototypes.
-+ *
-+ * Based on ideas and code from CFQ:
-+ * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
-+ *
-+ * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
-+ * Paolo Valente <paolo.valente@unimore.it>
-+ *
-+ * Copyright (C) 2010 Paolo Valente <paolo.valente@unimore.it>
-+ */
-+
-+#ifndef _BFQ_H
-+#define _BFQ_H
-+
-+#include <linux/blktrace_api.h>
-+#include <linux/hrtimer.h>
-+#include <linux/ioprio.h>
-+#include <linux/rbtree.h>
-+
-+#define BFQ_IOPRIO_CLASSES 3
-+#define BFQ_CL_IDLE_TIMEOUT (HZ/5)
-+
-+#define BFQ_MIN_WEIGHT 1
-+#define BFQ_MAX_WEIGHT 1000
-+
-+#define BFQ_DEFAULT_GRP_WEIGHT 10
-+#define BFQ_DEFAULT_GRP_IOPRIO 0
-+#define BFQ_DEFAULT_GRP_CLASS IOPRIO_CLASS_BE
-+
-+struct bfq_entity;
-+
-+/**
-+ * struct bfq_service_tree - per ioprio_class service tree.
-+ * @active: tree for active entities (i.e., those backlogged).
-+ * @idle: tree for idle entities (i.e., those not backlogged, with V <= F_i).
-+ * @first_idle: idle entity with minimum F_i.
-+ * @last_idle: idle entity with maximum F_i.
-+ * @vtime: scheduler virtual time.
-+ * @wsum: scheduler weight sum; active and idle entities contribute to it.
-+ *
-+ * Each service tree represents a B-WF2Q+ scheduler on its own. Each
-+ * ioprio_class has its own independent scheduler, and so its own
-+ * bfq_service_tree. All the fields are protected by the queue lock
-+ * of the containing bfqd.
-+ */
-+struct bfq_service_tree {
-+ struct rb_root active;
-+ struct rb_root idle;
-+
-+ struct bfq_entity *first_idle;
-+ struct bfq_entity *last_idle;
-+
-+ u64 vtime;
-+ unsigned long wsum;
-+};
-+
-+/**
-+ * struct bfq_sched_data - multi-class scheduler.
-+ * @active_entity: entity under service.
-+ * @next_active: head-of-the-line entity in the scheduler.
-+ * @service_tree: array of service trees, one per ioprio_class.
-+ *
-+ * bfq_sched_data is the basic scheduler queue. It supports three
-+ * ioprio_classes, and can be used either as a toplevel queue or as
-+ * an intermediate queue on a hierarchical setup.
-+ * @next_active points to the active entity of the sched_data service
-+ * trees that will be scheduled next.
-+ *
-+ * The supported ioprio_classes are the same as in CFQ, in descending
-+ * priority order, IOPRIO_CLASS_RT, IOPRIO_CLASS_BE, IOPRIO_CLASS_IDLE.
-+ * Requests from higher priority queues are served before all the
-+ * requests from lower priority queues; among requests of the same
-+ * queue requests are served according to B-WF2Q+.
-+ * All the fields are protected by the queue lock of the containing bfqd.
-+ */
-+struct bfq_sched_data {
-+ struct bfq_entity *active_entity;
-+ struct bfq_entity *next_active;
-+ struct bfq_service_tree service_tree[BFQ_IOPRIO_CLASSES];
-+};
-+
-+/**
-+ * struct bfq_entity - schedulable entity.
-+ * @rb_node: service_tree member.
-+ * @on_st: flag, true if the entity is on a tree (either the active or
-+ * the idle one of its service_tree).
-+ * @finish: B-WF2Q+ finish timestamp (aka F_i).
-+ * @start: B-WF2Q+ start timestamp (aka S_i).
-+ * @tree: tree the entity is enqueued into; %NULL if not on a tree.
-+ * @min_start: minimum start time of the (active) subtree rooted at
-+ * this entity; used for O(log N) lookups into active trees.
-+ * @service: service received during the last round of service.
-+ * @budget: budget used to calculate F_i; F_i = S_i + @budget / @weight.
-+ * @weight: weight of the queue
-+ * @parent: parent entity, for hierarchical scheduling.
-+ * @my_sched_data: for non-leaf nodes in the cgroup hierarchy, the
-+ * associated scheduler queue, %NULL on leaf nodes.
-+ * @sched_data: the scheduler queue this entity belongs to.
-+ * @ioprio: the ioprio in use.
-+ * @new_weight: when a weight change is requested, the new weight value.
-+ * @orig_weight: original weight, used to implement weight boosting
-+ * @new_ioprio: when an ioprio change is requested, the new ioprio value.
-+ * @ioprio_class: the ioprio_class in use.
-+ * @new_ioprio_class: when an ioprio_class change is requested, the new
-+ * ioprio_class value.
-+ * @ioprio_changed: flag, true when the user requested a weight, ioprio or
-+ * ioprio_class change.
-+ *
-+ * A bfq_entity is used to represent either a bfq_queue (leaf node in the
-+ * cgroup hierarchy) or a bfq_group into the upper level scheduler. Each
-+ * entity belongs to the sched_data of the parent group in the cgroup
-+ * hierarchy. Non-leaf entities have also their own sched_data, stored
-+ * in @my_sched_data.
-+ *
-+ * Each entity stores independently its priority values; this would
-+ * allow different weights on different devices, but this
-+ * functionality is not exported to userspace by now. Priorities and
-+ * weights are updated lazily, first storing the new values into the
-+ * new_* fields, then setting the @ioprio_changed flag. As soon as
-+ * there is a transition in the entity state that allows the priority
-+ * update to take place the effective and the requested priority
-+ * values are synchronized.
-+ *
-+ * Unless cgroups are used, the weight value is calculated from the
-+ * ioprio to export the same interface as CFQ. When dealing with
-+ * ``well-behaved'' queues (i.e., queues that do not spend too much
-+ * time to consume their budget and have true sequential behavior, and
-+ * when there are no external factors breaking anticipation) the
-+ * relative weights at each level of the cgroups hierarchy should be
-+ * guaranteed. All the fields are protected by the queue lock of the
-+ * containing bfqd.
-+ */
-+struct bfq_entity {
-+ struct rb_node rb_node;
-+
-+ int on_st;
-+
-+ u64 finish;
-+ u64 start;
-+
-+ struct rb_root *tree;
-+
-+ u64 min_start;
-+
-+ unsigned long service, budget;
-+ unsigned short weight, new_weight;
-+ unsigned short orig_weight;
-+
-+ struct bfq_entity *parent;
-+
-+ struct bfq_sched_data *my_sched_data;
-+ struct bfq_sched_data *sched_data;
-+
-+ unsigned short ioprio, new_ioprio;
-+ unsigned short ioprio_class, new_ioprio_class;
-+
-+ int ioprio_changed;
-+};
-+
-+struct bfq_group;
-+
-+/**
-+ * struct bfq_queue - leaf schedulable entity.
-+ * @ref: reference counter.
-+ * @bfqd: parent bfq_data.
-+ * @new_bfqq: shared bfq_queue if queue is cooperating with
-+ * one or more other queues.
-+ * @pos_node: request-position tree member (see bfq_data's @rq_pos_tree).
-+ * @pos_root: request-position tree root (see bfq_data's @rq_pos_tree).
-+ * @sort_list: sorted list of pending requests.
-+ * @next_rq: if fifo isn't expired, next request to serve.
-+ * @queued: nr of requests queued in @sort_list.
-+ * @allocated: currently allocated requests.
-+ * @meta_pending: pending metadata requests.
-+ * @fifo: fifo list of requests in sort_list.
-+ * @entity: entity representing this queue in the scheduler.
-+ * @max_budget: maximum budget allowed from the feedback mechanism.
-+ * @budget_timeout: budget expiration (in jiffies).
-+ * @dispatched: number of requests on the dispatch list or inside driver.
-+ * @org_ioprio: saved ioprio during boosted periods.
-+ * @flags: status flags.
-+ * @bfqq_list: node for active/idle bfqq list inside our bfqd.
-+ * @seek_samples: number of seeks sampled
-+ * @seek_total: sum of the distances of the seeks sampled
-+ * @seek_mean: mean seek distance
-+ * @last_request_pos: position of the last request enqueued
-+ * @pid: pid of the process owning the queue, used for logging purposes.
-+ * @last_rais_start_time: last (idle -> weight-raised) transition attempt
-+ * @raising_cur_max_time: current max raising time for this queue
-+ * @last_idle_bklogged: time of the last transition of the @bfq_queue from
-+ * idle to backlogged
-+ * @service_from_backlogged: cumulative service received from the @bfq_queue
-+ * since the last transition from idle to backlogged
-+ *
-+ * A bfq_queue is a leaf request queue; it can be associated to an io_context
-+ * or more (if it is an async one). @cgroup holds a reference to the
-+ * cgroup, to be sure that it does not disappear while a bfqq still
-+ * references it (mostly to avoid races between request issuing and task
-+ * migration followed by cgroup distruction).
-+ * All the fields are protected by the queue lock of the containing bfqd.
-+ */
-+struct bfq_queue {
-+ atomic_t ref;
-+ struct bfq_data *bfqd;
-+
-+ /* fields for cooperating queues handling */
-+ struct bfq_queue *new_bfqq;
-+ struct rb_node pos_node;
-+ struct rb_root *pos_root;
-+
-+ struct rb_root sort_list;
-+ struct request *next_rq;
-+ int queued[2];
-+ int allocated[2];
-+ int meta_pending;
-+ struct list_head fifo;
-+
-+ struct bfq_entity entity;
-+
-+ unsigned long max_budget;
-+ unsigned long budget_timeout;
-+
-+ int dispatched;
-+
-+ unsigned short org_ioprio;
-+
-+ unsigned int flags;
-+
-+ struct list_head bfqq_list;
-+
-+ unsigned int seek_samples;
-+ u64 seek_total;
-+ sector_t seek_mean;
-+ sector_t last_request_pos;
-+
-+ pid_t pid;
-+
-+ /* weight-raising fields */
-+ unsigned int raising_cur_max_time;
-+ unsigned long soft_rt_next_start;
-+ u64 last_rais_start_finish;
-+ unsigned int raising_coeff;
-+ u64 last_idle_bklogged;
-+ unsigned long service_from_backlogged;
-+};
-+
-+/**
-+ * struct bfq_ttime - per process thinktime stats.
-+ * @ttime_total: total process thinktime
-+ * @ttime_samples: number of thinktime samples
-+ * @ttime_mean: average process thinktime
-+ */
-+struct bfq_ttime {
-+ unsigned long last_end_request;
-+
-+ unsigned long ttime_total;
-+ unsigned long ttime_samples;
-+ unsigned long ttime_mean;
-+};
-+
-+/**
-+ * struct bfq_io_cq - per (request_queue, io_context) structure.
-+ * @icq: associated io_cq structure
-+ * @bfqq: array of two process queues, the sync and the async
-+ * @ttime: associated @bfq_ttime struct
-+ */
-+struct bfq_io_cq {
-+ struct io_cq icq; /* must be the first member */
-+ struct bfq_queue *bfqq[2];
-+ struct bfq_ttime ttime;
-+ int ioprio;
-+};
-+
-+/**
-+ * struct bfq_data - per device data structure.
-+ * @queue: request queue for the managed device.
-+ * @root_group: root bfq_group for the device.
-+ * @rq_pos_tree: rbtree sorted by next_request position,
-+ * used when determining if two or more queues
-+ * have interleaving requests (see bfq_close_cooperator).
-+ * @busy_queues: number of bfq_queues containing requests (including the
-+ * queue under service, even if it is idling).
-+ * @raised_busy_queues: number of weight-raised busy bfq_queues.
-+ * @queued: number of queued requests.
-+ * @rq_in_driver: number of requests dispatched and waiting for completion.
-+ * @sync_flight: number of sync requests in the driver.
-+ * @max_rq_in_driver: max number of reqs in driver in the last @hw_tag_samples
-+ * completed requests .
-+ * @hw_tag_samples: nr of samples used to calculate hw_tag.
-+ * @hw_tag: flag set to one if the driver is showing a queueing behavior.
-+ * @budgets_assigned: number of budgets assigned.
-+ * @idle_slice_timer: timer set when idling for the next sequential request
-+ * from the queue under service.
-+ * @unplug_work: delayed work to restart dispatching on the request queue.
-+ * @in_service_queue: bfq_queue under service.
-+ * @in_service_bic: bfq_io_cq (bic) associated with the @in_service_queue.
-+ * @last_position: on-disk position of the last served request.
-+ * @last_budget_start: beginning of the last budget.
-+ * @last_idling_start: beginning of the last idle slice.
-+ * @peak_rate: peak transfer rate observed for a budget.
-+ * @peak_rate_samples: number of samples used to calculate @peak_rate.
-+ * @bfq_max_budget: maximum budget allotted to a bfq_queue before rescheduling.
-+ * @group_list: list of all the bfq_groups active on the device.
-+ * @active_list: list of all the bfq_queues active on the device.
-+ * @idle_list: list of all the bfq_queues idle on the device.
-+ * @bfq_quantum: max number of requests dispatched per dispatch round.
-+ * @bfq_fifo_expire: timeout for async/sync requests; when it expires
-+ * requests are served in fifo order.
-+ * @bfq_back_penalty: weight of backward seeks wrt forward ones.
-+ * @bfq_back_max: maximum allowed backward seek.
-+ * @bfq_slice_idle: maximum idling time.
-+ * @bfq_user_max_budget: user-configured max budget value (0 for auto-tuning).
-+ * @bfq_max_budget_async_rq: maximum budget (in nr of requests) allotted to
-+ * async queues.
-+ * @bfq_timeout: timeout for bfq_queues to consume their budget; used to
-+ * to prevent seeky queues to impose long latencies to well
-+ * behaved ones (this also implies that seeky queues cannot
-+ * receive guarantees in the service domain; after a timeout
-+ * they are charged for the whole allocated budget, to try
-+ * to preserve a behavior reasonably fair among them, but
-+ * without service-domain guarantees).
-+ * @bfq_raising_coeff: Maximum factor by which the weight of a boosted
-+ * queue is multiplied
-+ * @bfq_raising_max_time: maximum duration of a weight-raising period (jiffies)
-+ * @bfq_raising_rt_max_time: maximum duration for soft real-time processes
-+ * @bfq_raising_min_idle_time: minimum idle period after which weight-raising
-+ * may be reactivated for a queue (in jiffies)
-+ * @bfq_raising_min_inter_arr_async: minimum period between request arrivals
-+ * after which weight-raising may be
-+ * reactivated for an already busy queue
-+ * (in jiffies)
-+ * @bfq_raising_max_softrt_rate: max service-rate for a soft real-time queue,
-+ * sectors per seconds
-+ * @RT_prod: cached value of the product R*T used for computing the maximum
-+ * duration of the weight raising automatically
-+ * @oom_bfqq: fallback dummy bfqq for extreme OOM conditions
-+ *
-+ * All the fields are protected by the @queue lock.
-+ */
-+struct bfq_data {
-+ struct request_queue *queue;
-+
-+ struct bfq_group *root_group;
-+
-+ struct rb_root rq_pos_tree;
-+
-+ int busy_queues;
-+ int raised_busy_queues;
-+ int queued;
-+ int rq_in_driver;
-+ int sync_flight;
-+
-+ int max_rq_in_driver;
-+ int hw_tag_samples;
-+ int hw_tag;
-+
-+ int budgets_assigned;
-+
-+ struct timer_list idle_slice_timer;
-+ struct work_struct unplug_work;
-+
-+ struct bfq_queue *in_service_queue;
-+ struct bfq_io_cq *in_service_bic;
-+
-+ sector_t last_position;
-+
-+ ktime_t last_budget_start;
-+ ktime_t last_idling_start;
-+ int peak_rate_samples;
-+ u64 peak_rate;
-+ unsigned long bfq_max_budget;
-+
-+ struct hlist_head group_list;
-+ struct list_head active_list;
-+ struct list_head idle_list;
-+
-+ unsigned int bfq_quantum;
-+ unsigned int bfq_fifo_expire[2];
-+ unsigned int bfq_back_penalty;
-+ unsigned int bfq_back_max;
-+ unsigned int bfq_slice_idle;
-+ u64 bfq_class_idle_last_service;
-+
-+ unsigned int bfq_user_max_budget;
-+ unsigned int bfq_max_budget_async_rq;
-+ unsigned int bfq_timeout[2];
-+
-+ bool low_latency;
-+
-+ /* parameters of the low_latency heuristics */
-+ unsigned int bfq_raising_coeff;
-+ unsigned int bfq_raising_max_time;
-+ unsigned int bfq_raising_rt_max_time;
-+ unsigned int bfq_raising_min_idle_time;
-+ unsigned long bfq_raising_min_inter_arr_async;
-+ unsigned int bfq_raising_max_softrt_rate;
-+ u64 RT_prod;
-+
-+ struct bfq_queue oom_bfqq;
-+};
-+
-+enum bfqq_state_flags {
-+ BFQ_BFQQ_FLAG_busy = 0, /* has requests or is under service */
-+ BFQ_BFQQ_FLAG_wait_request, /* waiting for a request */
-+ BFQ_BFQQ_FLAG_must_alloc, /* must be allowed rq alloc */
-+ BFQ_BFQQ_FLAG_fifo_expire, /* FIFO checked in this slice */
-+ BFQ_BFQQ_FLAG_idle_window, /* slice idling enabled */
-+ BFQ_BFQQ_FLAG_prio_changed, /* task priority has changed */
-+ BFQ_BFQQ_FLAG_sync, /* synchronous queue */
-+ BFQ_BFQQ_FLAG_budget_new, /* no completion with this budget */
-+ BFQ_BFQQ_FLAG_coop, /* bfqq is shared */
-+ BFQ_BFQQ_FLAG_split_coop, /* shared bfqq will be splitted */
-+ BFQ_BFQQ_FLAG_softrt_update, /* needs softrt-next-start update */
-+};
-+
-+#define BFQ_BFQQ_FNS(name) \
-+static inline void bfq_mark_bfqq_##name(struct bfq_queue *bfqq) \
-+{ \
-+ (bfqq)->flags |= (1 << BFQ_BFQQ_FLAG_##name); \
-+} \
-+static inline void bfq_clear_bfqq_##name(struct bfq_queue *bfqq) \
-+{ \
-+ (bfqq)->flags &= ~(1 << BFQ_BFQQ_FLAG_##name); \
-+} \
-+static inline int bfq_bfqq_##name(const struct bfq_queue *bfqq) \
-+{ \
-+ return ((bfqq)->flags & (1 << BFQ_BFQQ_FLAG_##name)) != 0; \
-+}
-+
-+BFQ_BFQQ_FNS(busy);
-+BFQ_BFQQ_FNS(wait_request);
-+BFQ_BFQQ_FNS(must_alloc);
-+BFQ_BFQQ_FNS(fifo_expire);
-+BFQ_BFQQ_FNS(idle_window);
-+BFQ_BFQQ_FNS(prio_changed);
-+BFQ_BFQQ_FNS(sync);
-+BFQ_BFQQ_FNS(budget_new);
-+BFQ_BFQQ_FNS(coop);
-+BFQ_BFQQ_FNS(split_coop);
-+BFQ_BFQQ_FNS(softrt_update);
-+#undef BFQ_BFQQ_FNS
-+
-+/* Logging facilities. */
-+#define bfq_log_bfqq(bfqd, bfqq, fmt, args...) \
-+ blk_add_trace_msg((bfqd)->queue, "bfq%d " fmt, (bfqq)->pid, ##args)
-+
-+#define bfq_log(bfqd, fmt, args...) \
-+ blk_add_trace_msg((bfqd)->queue, "bfq " fmt, ##args)
-+
-+/* Expiration reasons. */
-+enum bfqq_expiration {
-+ BFQ_BFQQ_TOO_IDLE = 0, /* queue has been idling for too long */
-+ BFQ_BFQQ_BUDGET_TIMEOUT, /* budget took too long to be used */
-+ BFQ_BFQQ_BUDGET_EXHAUSTED, /* budget consumed */
-+ BFQ_BFQQ_NO_MORE_REQUESTS, /* the queue has no more requests */
-+};
-+
-+#ifdef CONFIG_CGROUP_BFQIO
-+/**
-+ * struct bfq_group - per (device, cgroup) data structure.
-+ * @entity: schedulable entity to insert into the parent group sched_data.
-+ * @sched_data: own sched_data, to contain child entities (they may be
-+ * both bfq_queues and bfq_groups).
-+ * @group_node: node to be inserted into the bfqio_cgroup->group_data
-+ * list of the containing cgroup's bfqio_cgroup.
-+ * @bfqd_node: node to be inserted into the @bfqd->group_list list
-+ * of the groups active on the same device; used for cleanup.
-+ * @bfqd: the bfq_data for the device this group acts upon.
-+ * @async_bfqq: array of async queues for all the tasks belonging to
-+ * the group, one queue per ioprio value per ioprio_class,
-+ * except for the idle class that has only one queue.
-+ * @async_idle_bfqq: async queue for the idle class (ioprio is ignored).
-+ * @my_entity: pointer to @entity, %NULL for the toplevel group; used
-+ * to avoid too many special cases during group creation/migration.
-+ *
-+ * Each (device, cgroup) pair has its own bfq_group, i.e., for each cgroup
-+ * there is a set of bfq_groups, each one collecting the lower-level
-+ * entities belonging to the group that are acting on the same device.
-+ *
-+ * Locking works as follows:
-+ * o @group_node is protected by the bfqio_cgroup lock, and is accessed
-+ * via RCU from its readers.
-+ * o @bfqd is protected by the queue lock, RCU is used to access it
-+ * from the readers.
-+ * o All the other fields are protected by the @bfqd queue lock.
-+ */
-+struct bfq_group {
-+ struct bfq_entity entity;
-+ struct bfq_sched_data sched_data;
-+
-+ struct hlist_node group_node;
-+ struct hlist_node bfqd_node;
-+
-+ void *bfqd;
-+
-+ struct bfq_queue *async_bfqq[2][IOPRIO_BE_NR];
-+ struct bfq_queue *async_idle_bfqq;
-+
-+ struct bfq_entity *my_entity;
-+};
-+
-+/**
-+ * struct bfqio_cgroup - bfq cgroup data structure.
-+ * @css: subsystem state for bfq in the containing cgroup.
-+ * @weight: cgroup weight.
-+ * @ioprio: cgroup ioprio.
-+ * @ioprio_class: cgroup ioprio_class.
-+ * @lock: spinlock that protects @ioprio, @ioprio_class and @group_data.
-+ * @group_data: list containing the bfq_group belonging to this cgroup.
-+ *
-+ * @group_data is accessed using RCU, with @lock protecting the updates,
-+ * @ioprio and @ioprio_class are protected by @lock.
-+ */
-+struct bfqio_cgroup {
-+ struct cgroup_subsys_state css;
-+
-+ unsigned short weight, ioprio, ioprio_class;
-+
-+ spinlock_t lock;
-+ struct hlist_head group_data;
-+};
-+#else
-+struct bfq_group {
-+ struct bfq_sched_data sched_data;
-+
-+ struct bfq_queue *async_bfqq[2][IOPRIO_BE_NR];
-+ struct bfq_queue *async_idle_bfqq;
-+};
-+#endif
-+
-+static inline struct bfq_service_tree *
-+bfq_entity_service_tree(struct bfq_entity *entity)
-+{
-+ struct bfq_sched_data *sched_data = entity->sched_data;
-+ unsigned int idx = entity->ioprio_class - 1;
-+
-+ BUG_ON(idx >= BFQ_IOPRIO_CLASSES);
-+ BUG_ON(sched_data == NULL);
-+
-+ return sched_data->service_tree + idx;
-+}
-+
-+static inline struct bfq_queue *bic_to_bfqq(struct bfq_io_cq *bic,
-+ int is_sync)
-+{
-+ return bic->bfqq[!!is_sync];
-+}
-+
-+static inline void bic_set_bfqq(struct bfq_io_cq *bic,
-+ struct bfq_queue *bfqq, int is_sync)
-+{
-+ bic->bfqq[!!is_sync] = bfqq;
-+}
-+
-+static inline struct bfq_data *bic_to_bfqd(struct bfq_io_cq *bic)
-+{
-+ return bic->icq.q->elevator->elevator_data;
-+}
-+
-+/**
-+ * bfq_get_bfqd_locked - get a lock to a bfqd using a RCU protected pointer.
-+ * @ptr: a pointer to a bfqd.
-+ * @flags: storage for the flags to be saved.
-+ *
-+ * This function allows bfqg->bfqd to be protected by the
-+ * queue lock of the bfqd they reference; the pointer is dereferenced
-+ * under RCU, so the storage for bfqd is assured to be safe as long
-+ * as the RCU read side critical section does not end. After the
-+ * bfqd->queue->queue_lock is taken the pointer is rechecked, to be
-+ * sure that no other writer accessed it. If we raced with a writer,
-+ * the function returns NULL, with the queue unlocked, otherwise it
-+ * returns the dereferenced pointer, with the queue locked.
-+ */
-+static inline struct bfq_data *bfq_get_bfqd_locked(void **ptr,
-+ unsigned long *flags)
-+{
-+ struct bfq_data *bfqd;
-+
-+ rcu_read_lock();
-+ bfqd = rcu_dereference(*(struct bfq_data **)ptr);
-+
-+ if (bfqd != NULL) {
-+ spin_lock_irqsave(bfqd->queue->queue_lock, *flags);
-+ if (*ptr == bfqd)
-+ goto out;
-+ spin_unlock_irqrestore(bfqd->queue->queue_lock, *flags);
-+ }
-+
-+ bfqd = NULL;
-+out:
-+ rcu_read_unlock();
-+ return bfqd;
-+}
-+
-+static inline void bfq_put_bfqd_unlock(struct bfq_data *bfqd,
-+ unsigned long *flags)
-+{
-+ spin_unlock_irqrestore(bfqd->queue->queue_lock, *flags);
-+}
-+
-+static void bfq_changed_ioprio(struct bfq_io_cq *bic);
-+static void bfq_put_queue(struct bfq_queue *bfqq);
-+static void bfq_dispatch_insert(struct request_queue *q, struct request *rq);
-+static struct bfq_queue *bfq_get_queue(struct bfq_data *bfqd,
-+ struct bfq_group *bfqg, int is_sync,
-+ struct bfq_io_cq *bic, gfp_t gfp_mask);
-+static void bfq_end_raising_async_queues(struct bfq_data *bfqd,
-+ struct bfq_group *bfqg);
-+static void bfq_put_async_queues(struct bfq_data *bfqd, struct bfq_group *bfqg);
-+static void bfq_exit_bfqq(struct bfq_data *bfqd, struct bfq_queue *bfqq);
-+#endif
---
-1.8.5.2
-
diff --git a/sys-kernel/kogaion-sources/files/desktop/0003-block-bfq-add-Early-Queue-Merge-EQM-to-BFQ-v7-for-3.10.0.patch b/sys-kernel/kogaion-sources/files/desktop/0003-block-bfq-add-Early-Queue-Merge-EQM-to-BFQ-v7-for-3.10.0.patch
deleted file mode 100644
index ea585f02..00000000
--- a/sys-kernel/kogaion-sources/files/desktop/0003-block-bfq-add-Early-Queue-Merge-EQM-to-BFQ-v7-for-3.10.0.patch
+++ /dev/null
@@ -1,1034 +0,0 @@
-From efc499347ea3827417cf00718616bf61a090afec Mon Sep 17 00:00:00 2001
-From: Mauro Andreolini <mauro.andreolini@unimore.it>
-Date: Thu, 23 Jan 2014 16:54:44 +0100
-Subject: [PATCH 3/3] block, bfq: add Early Queue Merge (EQM) to BFQ-v7 for
- 3.10.0
-
-A set of processes may happen to perform interleaved reads, i.e., requests
-whose union would give rise to a sequential read pattern. There are two
-typical cases: in the first case, processes read fixed-size chunks of
-data at a fixed distance from each other, while in the second case processes
-may read variable-size chunks at variable distances. The latter case occurs
-for example with KVM, which splits the I/O generated by the guest into
-multiple chunks, and lets these chunks be served by a pool of cooperating
-processes, iteratively assigning the next chunk of I/O to the first
-available process. CFQ uses actual queue merging for the first type of
-rocesses, whereas it uses preemption to get a sequential read pattern out
-of the read requests performed by the second type of processes. In the end
-it uses two different mechanisms to achieve the same goal: boosting the
-throughput with interleaved I/O.
-
-This patch introduces Early Queue Merge (EQM), a unified mechanism to get a
-sequential read pattern with both types of processes. The main idea is
-checking newly arrived requests against the next request of the active queue
-both in case of actual request insert and in case of request merge. By doing
-so, both the types of processes can be handled by just merging their queues.
-EQM is then simpler and more compact than the pair of mechanisms used in
-CFQ.
-
-Finally, EQM also preserves the typical low-latency properties of BFQ, by
-properly restoring the weight-raising state of a queue when it gets back to
-a non-merged state.
-
-Signed-off-by: Mauro Andreolini <mauro.andreolini@unimore.it>
-Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
-Reviewed-by: Paolo Valente <paolo.valente@unimore.it>
----
- block/bfq-iosched.c | 657 ++++++++++++++++++++++++++++++++++++----------------
- block/bfq-sched.c | 28 ---
- block/bfq.h | 16 ++
- 3 files changed, 474 insertions(+), 227 deletions(-)
-
-diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
-index 96abb81..99083be6 100644
---- a/block/bfq-iosched.c
-+++ b/block/bfq-iosched.c
-@@ -445,6 +445,46 @@ static inline unsigned int bfq_wrais_duration(struct bfq_data *bfqd)
- return dur;
- }
-
-+static inline void
-+bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_io_cq *bic)
-+{
-+ if (bic->saved_idle_window)
-+ bfq_mark_bfqq_idle_window(bfqq);
-+ else
-+ bfq_clear_bfqq_idle_window(bfqq);
-+ if (bic->raising_time_left && bfqq->bfqd->low_latency) {
-+ /*
-+ * Start a weight raising period with the duration given by
-+ * the raising_time_left snapshot.
-+ */
-+ if (bfq_bfqq_busy(bfqq))
-+ bfqq->bfqd->raised_busy_queues++;
-+ bfqq->raising_coeff = bfqq->bfqd->bfq_raising_coeff;
-+ bfqq->raising_cur_max_time = bic->raising_time_left;
-+ bfqq->last_rais_start_finish = jiffies;
-+ bfqq->entity.ioprio_changed = 1;
-+ }
-+ /*
-+ * Clear raising_time_left to prevent bfq_bfqq_save_state() from
-+ * getting confused about the queue's need of a weight-raising
-+ * period.
-+ */
-+ bic->raising_time_left = 0;
-+}
-+
-+/*
-+ * Must be called with the queue_lock held.
-+ */
-+static int bfqq_process_refs(struct bfq_queue *bfqq)
-+{
-+ int process_refs, io_refs;
-+
-+ io_refs = bfqq->allocated[READ] + bfqq->allocated[WRITE];
-+ process_refs = atomic_read(&bfqq->ref) - io_refs - bfqq->entity.on_st;
-+ BUG_ON(process_refs < 0);
-+ return process_refs;
-+}
-+
- static void bfq_add_rq_rb(struct request *rq)
- {
- struct bfq_queue *bfqq = RQ_BFQQ(rq);
-@@ -486,12 +526,20 @@ static void bfq_add_rq_rb(struct request *rq)
- if (!bfqd->low_latency)
- goto add_bfqq_busy;
-
-+ if (bfq_bfqq_just_split(bfqq))
-+ goto set_ioprio_changed;
-+
- /*
-- * If the queue is not being boosted and has been idle
-- * for enough time, start a weight-raising period
-+ * If the queue:
-+ * - is not being boosted,
-+ * - has been idle for enough time,
-+ * - is not a sync queue or is linked to a bfq_io_cq (it is
-+ * shared "for its nature" or it is not shared and its
-+ * requests have not been redirected to a shared queue)
-+ * start a weight-raising period.
- */
-- if (old_raising_coeff == 1 &&
-- (idle_for_long_time || soft_rt)) {
-+ if (old_raising_coeff == 1 && (idle_for_long_time || soft_rt) &&
-+ (!bfq_bfqq_sync(bfqq) || bfqq->bic != NULL)) {
- bfqq->raising_coeff = bfqd->bfq_raising_coeff;
- if (idle_for_long_time)
- bfqq->raising_cur_max_time =
-@@ -572,6 +620,7 @@ static void bfq_add_rq_rb(struct request *rq)
- bfqd->bfq_raising_rt_max_time;
- }
- }
-+set_ioprio_changed:
- if (old_raising_coeff != bfqq->raising_coeff)
- entity->ioprio_changed = 1;
- add_bfqq_busy:
-@@ -754,90 +803,35 @@ static void bfq_end_raising(struct bfq_data *bfqd)
- spin_unlock_irq(bfqd->queue->queue_lock);
- }
-
--static int bfq_allow_merge(struct request_queue *q, struct request *rq,
-- struct bio *bio)
--{
-- struct bfq_data *bfqd = q->elevator->elevator_data;
-- struct bfq_io_cq *bic;
-- struct bfq_queue *bfqq;
--
-- /*
-- * Disallow merge of a sync bio into an async request.
-- */
-- if (bfq_bio_sync(bio) && !rq_is_sync(rq))
-- return 0;
--
-- /*
-- * Lookup the bfqq that this bio will be queued with. Allow
-- * merge only if rq is queued there.
-- * Queue lock is held here.
-- */
-- bic = bfq_bic_lookup(bfqd, current->io_context);
-- if (bic == NULL)
-- return 0;
--
-- bfqq = bic_to_bfqq(bic, bfq_bio_sync(bio));
-- return bfqq == RQ_BFQQ(rq);
--}
--
--static void __bfq_set_in_service_queue(struct bfq_data *bfqd,
-- struct bfq_queue *bfqq)
--{
-- if (bfqq != NULL) {
-- bfq_mark_bfqq_must_alloc(bfqq);
-- bfq_mark_bfqq_budget_new(bfqq);
-- bfq_clear_bfqq_fifo_expire(bfqq);
--
-- bfqd->budgets_assigned = (bfqd->budgets_assigned*7 + 256) / 8;
--
-- bfq_log_bfqq(bfqd, bfqq,
-- "set_in_service_queue, cur-budget = %lu",
-- bfqq->entity.budget);
-- }
--
-- bfqd->in_service_queue = bfqq;
--}
--
--/*
-- * Get and set a new queue for service.
-- */
--static struct bfq_queue *bfq_set_in_service_queue(struct bfq_data *bfqd,
-- struct bfq_queue *bfqq)
-+static inline sector_t bfq_io_struct_pos(void *io_struct, bool request)
- {
-- if (!bfqq)
-- bfqq = bfq_get_next_queue(bfqd);
-+ if (request)
-+ return blk_rq_pos(io_struct);
- else
-- bfq_get_next_queue_forced(bfqd, bfqq);
--
-- __bfq_set_in_service_queue(bfqd, bfqq);
-- return bfqq;
-+ return ((struct bio *)io_struct)->bi_sector;
- }
-
--static inline sector_t bfq_dist_from_last(struct bfq_data *bfqd,
-- struct request *rq)
-+static inline sector_t bfq_dist_from(sector_t pos1,
-+ sector_t pos2)
- {
-- if (blk_rq_pos(rq) >= bfqd->last_position)
-- return blk_rq_pos(rq) - bfqd->last_position;
-+ if (pos1 >= pos2)
-+ return pos1 - pos2;
- else
-- return bfqd->last_position - blk_rq_pos(rq);
-+ return pos2 - pos1;
- }
-
--/*
-- * Return true if bfqq has no request pending and rq is close enough to
-- * bfqd->last_position, or if rq is closer to bfqd->last_position than
-- * bfqq->next_rq
-- */
--static inline int bfq_rq_close(struct bfq_data *bfqd, struct request *rq)
-+static inline int bfq_rq_close_to_sector(void *io_struct, bool request,
-+ sector_t sector)
- {
-- return bfq_dist_from_last(bfqd, rq) <= BFQQ_SEEK_THR;
-+ return bfq_dist_from(bfq_io_struct_pos(io_struct, request), sector) <=
-+ BFQQ_SEEK_THR;
- }
-
--static struct bfq_queue *bfqq_close(struct bfq_data *bfqd)
-+static struct bfq_queue *bfqq_close(struct bfq_data *bfqd, sector_t sector)
- {
- struct rb_root *root = &bfqd->rq_pos_tree;
- struct rb_node *parent, *node;
- struct bfq_queue *__bfqq;
-- sector_t sector = bfqd->last_position;
-
- if (RB_EMPTY_ROOT(root))
- return NULL;
-@@ -856,7 +850,7 @@ static struct bfq_queue *bfqq_close(struct bfq_data *bfqd)
- * position).
- */
- __bfqq = rb_entry(parent, struct bfq_queue, pos_node);
-- if (bfq_rq_close(bfqd, __bfqq->next_rq))
-+ if (bfq_rq_close_to_sector(__bfqq->next_rq, true, sector))
- return __bfqq;
-
- if (blk_rq_pos(__bfqq->next_rq) < sector)
-@@ -867,7 +861,7 @@ static struct bfq_queue *bfqq_close(struct bfq_data *bfqd)
- return NULL;
-
- __bfqq = rb_entry(node, struct bfq_queue, pos_node);
-- if (bfq_rq_close(bfqd, __bfqq->next_rq))
-+ if (bfq_rq_close_to_sector(__bfqq->next_rq, true, sector))
- return __bfqq;
-
- return NULL;
-@@ -876,14 +870,12 @@ static struct bfq_queue *bfqq_close(struct bfq_data *bfqd)
- /*
- * bfqd - obvious
- * cur_bfqq - passed in so that we don't decide that the current queue
-- * is closely cooperating with itself.
-- *
-- * We are assuming that cur_bfqq has dispatched at least one request,
-- * and that bfqd->last_position reflects a position on the disk associated
-- * with the I/O issued by cur_bfqq.
-+ * is closely cooperating with itself
-+ * sector - used as a reference point to search for a close queue
- */
- static struct bfq_queue *bfq_close_cooperator(struct bfq_data *bfqd,
-- struct bfq_queue *cur_bfqq)
-+ struct bfq_queue *cur_bfqq,
-+ sector_t sector)
- {
- struct bfq_queue *bfqq;
-
-@@ -903,7 +895,7 @@ static struct bfq_queue *bfq_close_cooperator(struct bfq_data *bfqd,
- * working closely on the same area of the disk. In that case,
- * we can group them together and don't waste time idling.
- */
-- bfqq = bfqq_close(bfqd);
-+ bfqq = bfqq_close(bfqd, sector);
- if (bfqq == NULL || bfqq == cur_bfqq)
- return NULL;
-
-@@ -930,6 +922,282 @@ static struct bfq_queue *bfq_close_cooperator(struct bfq_data *bfqd,
- return bfqq;
- }
-
-+static struct bfq_queue *
-+bfq_setup_merge(struct bfq_queue *bfqq, struct bfq_queue *new_bfqq)
-+{
-+ int process_refs, new_process_refs;
-+ struct bfq_queue *__bfqq;
-+
-+ /*
-+ * If there are no process references on the new_bfqq, then it is
-+ * unsafe to follow the ->new_bfqq chain as other bfqq's in the chain
-+ * may have dropped their last reference (not just their last process
-+ * reference).
-+ */
-+ if (!bfqq_process_refs(new_bfqq))
-+ return NULL;
-+
-+ /* Avoid a circular list and skip interim queue merges. */
-+ while ((__bfqq = new_bfqq->new_bfqq)) {
-+ if (__bfqq == bfqq)
-+ return NULL;
-+ new_bfqq = __bfqq;
-+ }
-+
-+ process_refs = bfqq_process_refs(bfqq);
-+ new_process_refs = bfqq_process_refs(new_bfqq);
-+ /*
-+ * If the process for the bfqq has gone away, there is no
-+ * sense in merging the queues.
-+ */
-+ if (process_refs == 0 || new_process_refs == 0)
-+ return NULL;
-+
-+ bfq_log_bfqq(bfqq->bfqd, bfqq, "scheduling merge with queue %d",
-+ new_bfqq->pid);
-+
-+ /*
-+ * Merging is just a redirection: the requests of the process owning
-+ * one of the two queues are redirected to the other queue. The latter
-+ * queue, in its turn, is set as shared if this is the first time that
-+ * the requests of some process are redirected to it.
-+ *
-+ * We redirect bfqq to new_bfqq and not the opposite, because we
-+ * are in the context of the process owning bfqq, hence we have the
-+ * io_cq of this process. So we can immediately configure this io_cq
-+ * to redirect the requests of the process to new_bfqq.
-+ *
-+ * NOTE, even if new_bfqq coincides with the in-service queue, the
-+ * io_cq of new_bfqq is not available, because, if the in-service queue
-+ * is shared, bfqd->in_service_bic may not point to the io_cq of the
-+ * in-service queue.
-+ * Redirecting the requests of the process owning bfqq to the currently
-+ * in-service queue is in any case the best option, as we feed the
-+ * in-service queue with new requests close to the last request served
-+ * and, by doing so, hopefully increase the throughput.
-+ */
-+ bfqq->new_bfqq = new_bfqq;
-+ atomic_add(process_refs, &new_bfqq->ref);
-+ return new_bfqq;
-+}
-+
-+/*
-+ * Attempt to schedule a merge of bfqq with the currently in-service queue or
-+ * with a close queue among the scheduled queues.
-+ * Return NULL if no merge was scheduled, a pointer to the shared bfq_queue
-+ * structure otherwise.
-+ */
-+static struct bfq_queue *
-+bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq,
-+ void *io_struct, bool request)
-+{
-+ struct bfq_queue *in_service_bfqq, *new_bfqq;
-+
-+ if (bfqq->new_bfqq)
-+ return bfqq->new_bfqq;
-+
-+ if (!io_struct)
-+ return NULL;
-+
-+ in_service_bfqq = bfqd->in_service_queue;
-+
-+ if (in_service_bfqq == NULL || in_service_bfqq == bfqq ||
-+ !bfqd->in_service_bic)
-+ goto check_scheduled;
-+
-+ if (bfq_class_idle(in_service_bfqq) || bfq_class_idle(bfqq))
-+ goto check_scheduled;
-+
-+ if (bfq_class_rt(in_service_bfqq) != bfq_class_rt(bfqq))
-+ goto check_scheduled;
-+
-+ if (in_service_bfqq->entity.parent != bfqq->entity.parent)
-+ goto check_scheduled;
-+
-+ if (bfq_rq_close_to_sector(io_struct, request, bfqd->last_position) &&
-+ bfq_bfqq_sync(in_service_bfqq) && bfq_bfqq_sync(bfqq)) {
-+ new_bfqq = bfq_setup_merge(bfqq, in_service_bfqq);
-+ if (new_bfqq != NULL)
-+ return new_bfqq; /* Merge with the in-service queue */
-+ }
-+
-+ /*
-+ * Check whether there is a cooperator among currently scheduled
-+ * queues. The only thing we need is that the bio/request is not
-+ * NULL, as we need it to establish whether a cooperator exists.
-+ */
-+check_scheduled:
-+ new_bfqq = bfq_close_cooperator(bfqd, bfqq,
-+ bfq_io_struct_pos(io_struct, request));
-+ if (new_bfqq)
-+ return bfq_setup_merge(bfqq, new_bfqq);
-+
-+ return NULL;
-+}
-+
-+static inline void
-+bfq_bfqq_save_state(struct bfq_queue *bfqq)
-+{
-+ /*
-+ * If bfqq->bic == NULL, the queue is already shared or its requests
-+ * have already been redirected to a shared queue; both idle window
-+ * and weight raising state have already been saved. Do nothing.
-+ */
-+ if (bfqq->bic == NULL)
-+ return;
-+ if (bfqq->bic->raising_time_left)
-+ /*
-+ * This is the queue of a just-started process, and would
-+ * deserve weight raising: we set raising_time_left to the full
-+ * weight-raising duration to trigger weight-raising when and
-+ * if the queue is split and the first request of the queue
-+ * is enqueued.
-+ */
-+ bfqq->bic->raising_time_left = bfq_wrais_duration(bfqq->bfqd);
-+ else if (bfqq->raising_coeff > 1) {
-+ unsigned long wrais_duration =
-+ jiffies - bfqq->last_rais_start_finish;
-+ /*
-+ * It may happen that a queue's weight raising period lasts
-+ * longer than its raising_cur_max_time, as weight raising is
-+ * handled only when a request is enqueued or dispatched (it
-+ * does not use any timer). If the weight raising period is
-+ * about to end, don't save it.
-+ */
-+ if (bfqq->raising_cur_max_time <= wrais_duration)
-+ bfqq->bic->raising_time_left = 0;
-+ else
-+ bfqq->bic->raising_time_left =
-+ bfqq->raising_cur_max_time - wrais_duration;
-+ /*
-+ * The bfq_queue is becoming shared or the requests of the
-+ * process owning the queue are being redirected to a shared
-+ * queue. Stop the weight raising period of the queue, as in
-+ * both cases it should not be owned by an interactive or soft
-+ * real-time application.
-+ */
-+ bfq_bfqq_end_raising(bfqq);
-+ } else
-+ bfqq->bic->raising_time_left = 0;
-+ bfqq->bic->saved_idle_window = bfq_bfqq_idle_window(bfqq);
-+}
-+
-+static inline void
-+bfq_get_bic_reference(struct bfq_queue *bfqq)
-+{
-+ /*
-+ * If bfqq->bic has a non-NULL value, the bic to which it belongs
-+ * is about to begin using a shared bfq_queue.
-+ */
-+ if (bfqq->bic)
-+ atomic_long_inc(&bfqq->bic->icq.ioc->refcount);
-+}
-+
-+static void
-+bfq_merge_bfqqs(struct bfq_data *bfqd, struct bfq_io_cq *bic,
-+ struct bfq_queue *bfqq, struct bfq_queue *new_bfqq)
-+{
-+ bfq_log_bfqq(bfqd, bfqq, "merging with queue %lu",
-+ (long unsigned)new_bfqq->pid);
-+ /* Save weight raising and idle window of the merged queues */
-+ bfq_bfqq_save_state(bfqq);
-+ bfq_bfqq_save_state(new_bfqq);
-+ /*
-+ * Grab a reference to the bic, to prevent it from being destroyed
-+ * before being possibly touched by a bfq_split_bfqq().
-+ */
-+ bfq_get_bic_reference(bfqq);
-+ bfq_get_bic_reference(new_bfqq);
-+ /* Merge queues (that is, let bic redirect its requests to new_bfqq) */
-+ bic_set_bfqq(bic, new_bfqq, 1);
-+ bfq_mark_bfqq_coop(new_bfqq);
-+ /*
-+ * new_bfqq now belongs to at least two bics (it is a shared queue): set
-+ * new_bfqq->bic to NULL. bfqq either:
-+ * - does not belong to any bic any more, and hence bfqq->bic must
-+ * be set to NULL, or
-+ * - is a queue whose owning bics have already been redirected to a
-+ * different queue, hence the queue is destined to not belong to any
-+ * bic soon and bfqq->bic is already NULL (therefore the next
-+ * assignment causes no harm).
-+ */
-+ new_bfqq->bic = NULL;
-+ bfqq->bic = NULL;
-+ bfq_put_queue(bfqq);
-+}
-+
-+static int bfq_allow_merge(struct request_queue *q, struct request *rq,
-+ struct bio *bio)
-+{
-+ struct bfq_data *bfqd = q->elevator->elevator_data;
-+ struct bfq_io_cq *bic;
-+ struct bfq_queue *bfqq, *new_bfqq;
-+
-+ /*
-+ * Disallow merge of a sync bio into an async request.
-+ */
-+ if (bfq_bio_sync(bio) && !rq_is_sync(rq))
-+ return 0;
-+
-+ /*
-+ * Lookup the bfqq that this bio will be queued with. Allow
-+ * merge only if rq is queued there.
-+ * Queue lock is held here.
-+ */
-+ bic = bfq_bic_lookup(bfqd, current->io_context);
-+ if (bic == NULL)
-+ return 0;
-+
-+ bfqq = bic_to_bfqq(bic, bfq_bio_sync(bio));
-+ /*
-+ * We take advantage of this function to perform an early merge
-+ * of the queues of possible cooperating processes.
-+ */
-+ if (bfqq != NULL) {
-+ new_bfqq = bfq_setup_cooperator(bfqd, bfqq, bio, false);
-+ if (new_bfqq != NULL) {
-+ bfq_merge_bfqqs(bfqd, bic, bfqq, new_bfqq);
-+ /*
-+ * If we get here, the bio will be queued in the shared queue,
-+ * i.e., new_bfqq, so use new_bfqq to decide whether bio and
-+ * rq can be merged.
-+ */
-+ bfqq = new_bfqq;
-+ }
-+ }
-+
-+ return bfqq == RQ_BFQQ(rq);
-+}
-+
-+static void __bfq_set_in_service_queue(struct bfq_data *bfqd,
-+ struct bfq_queue *bfqq)
-+{
-+ if (bfqq != NULL) {
-+ bfq_mark_bfqq_must_alloc(bfqq);
-+ bfq_mark_bfqq_budget_new(bfqq);
-+ bfq_clear_bfqq_fifo_expire(bfqq);
-+
-+ bfqd->budgets_assigned = (bfqd->budgets_assigned*7 + 256) / 8;
-+
-+ bfq_log_bfqq(bfqd, bfqq,
-+ "set_in_service_queue, cur-budget = %lu",
-+ bfqq->entity.budget);
-+ }
-+
-+ bfqd->in_service_queue = bfqq;
-+}
-+
-+/*
-+ * Get and set a new queue for service.
-+ */
-+static struct bfq_queue *bfq_set_in_service_queue(struct bfq_data *bfqd)
-+{
-+ struct bfq_queue *bfqq = bfq_get_next_queue(bfqd);
-+
-+ __bfq_set_in_service_queue(bfqd, bfqq);
-+ return bfqq;
-+}
-+
- /*
- * If enough samples have been computed, return the current max budget
- * stored in bfqd, which is dynamically updated according to the
-@@ -1077,63 +1345,6 @@ static struct request *bfq_check_fifo(struct bfq_queue *bfqq)
- return rq;
- }
-
--/*
-- * Must be called with the queue_lock held.
-- */
--static int bfqq_process_refs(struct bfq_queue *bfqq)
--{
-- int process_refs, io_refs;
--
-- io_refs = bfqq->allocated[READ] + bfqq->allocated[WRITE];
-- process_refs = atomic_read(&bfqq->ref) - io_refs - bfqq->entity.on_st;
-- BUG_ON(process_refs < 0);
-- return process_refs;
--}
--
--static void bfq_setup_merge(struct bfq_queue *bfqq, struct bfq_queue *new_bfqq)
--{
-- int process_refs, new_process_refs;
-- struct bfq_queue *__bfqq;
--
-- /*
-- * If there are no process references on the new_bfqq, then it is
-- * unsafe to follow the ->new_bfqq chain as other bfqq's in the chain
-- * may have dropped their last reference (not just their last process
-- * reference).
-- */
-- if (!bfqq_process_refs(new_bfqq))
-- return;
--
-- /* Avoid a circular list and skip interim queue merges. */
-- while ((__bfqq = new_bfqq->new_bfqq)) {
-- if (__bfqq == bfqq)
-- return;
-- new_bfqq = __bfqq;
-- }
--
-- process_refs = bfqq_process_refs(bfqq);
-- new_process_refs = bfqq_process_refs(new_bfqq);
-- /*
-- * If the process for the bfqq has gone away, there is no
-- * sense in merging the queues.
-- */
-- if (process_refs == 0 || new_process_refs == 0)
-- return;
--
-- /*
-- * Merge in the direction of the lesser amount of work.
-- */
-- if (new_process_refs >= process_refs) {
-- bfqq->new_bfqq = new_bfqq;
-- atomic_add(process_refs, &new_bfqq->ref);
-- } else {
-- new_bfqq->new_bfqq = bfqq;
-- atomic_add(new_process_refs, &bfqq->ref);
-- }
-- bfq_log_bfqq(bfqq->bfqd, bfqq, "scheduling merge with queue %d",
-- new_bfqq->pid);
--}
--
- static inline unsigned long bfq_bfqq_budget_left(struct bfq_queue *bfqq)
- {
- struct bfq_entity *entity = &bfqq->entity;
-@@ -1703,7 +1914,7 @@ static inline bool bfq_bfqq_must_idle(struct bfq_queue *bfqq)
- */
- static struct bfq_queue *bfq_select_queue(struct bfq_data *bfqd)
- {
-- struct bfq_queue *bfqq, *new_bfqq = NULL;
-+ struct bfq_queue *bfqq;
- struct request *next_rq;
- enum bfqq_expiration reason = BFQ_BFQQ_BUDGET_TIMEOUT;
-
-@@ -1713,17 +1924,6 @@ static struct bfq_queue *bfq_select_queue(struct bfq_data *bfqd)
-
- bfq_log_bfqq(bfqd, bfqq, "select_queue: already in-service queue");
-
-- /*
-- * If another queue has a request waiting within our mean seek
-- * distance, let it run. The expire code will check for close
-- * cooperators and put the close queue at the front of the
-- * service tree. If possible, merge the expiring queue with the
-- * new bfqq.
-- */
-- new_bfqq = bfq_close_cooperator(bfqd, bfqq);
-- if (new_bfqq != NULL && bfqq->new_bfqq == NULL)
-- bfq_setup_merge(bfqq, new_bfqq);
--
- if (bfq_may_expire_for_budg_timeout(bfqq) &&
- !timer_pending(&bfqd->idle_slice_timer) &&
- !bfq_bfqq_must_idle(bfqq))
-@@ -1760,36 +1960,26 @@ static struct bfq_queue *bfq_select_queue(struct bfq_data *bfqd)
- bfq_clear_bfqq_wait_request(bfqq);
- del_timer(&bfqd->idle_slice_timer);
- }
-- if (new_bfqq == NULL)
-- goto keep_queue;
-- else
-- goto expire;
-+ goto keep_queue;
- }
- }
-
- /*
-- * No requests pending. If the in-service queue has no cooperator and
-- * still has requests in flight (possibly waiting for a completion)
-- * or is idling for a new request, then keep it.
-+ * No requests pending. If the in-service queue still has requests in
-+ * flight (possibly waiting for a completion) or is idling for a new
-+ * request, then keep it.
- */
-- if (new_bfqq == NULL && (timer_pending(&bfqd->idle_slice_timer) ||
-- (bfqq->dispatched != 0 && bfq_bfqq_must_not_expire(bfqq)))) {
-+ if (timer_pending(&bfqd->idle_slice_timer) ||
-+ (bfqq->dispatched != 0 && bfq_bfqq_must_not_expire(bfqq))) {
- bfqq = NULL;
- goto keep_queue;
-- } else if (new_bfqq != NULL && timer_pending(&bfqd->idle_slice_timer)) {
-- /*
-- * Expiring the queue because there is a close cooperator,
-- * cancel timer.
-- */
-- bfq_clear_bfqq_wait_request(bfqq);
-- del_timer(&bfqd->idle_slice_timer);
- }
-
- reason = BFQ_BFQQ_NO_MORE_REQUESTS;
- expire:
- bfq_bfqq_expire(bfqd, bfqq, 0, reason);
- new_queue:
-- bfqq = bfq_set_in_service_queue(bfqd, new_bfqq);
-+ bfqq = bfq_set_in_service_queue(bfqd);
- bfq_log(bfqd, "select_queue: new queue %d returned",
- bfqq != NULL ? bfqq->pid : 0);
- keep_queue:
-@@ -1799,9 +1989,8 @@ keep_queue:
- static void bfq_update_raising_data(struct bfq_data *bfqd,
- struct bfq_queue *bfqq)
- {
-+ struct bfq_entity *entity = &bfqq->entity;
- if (bfqq->raising_coeff > 1) { /* queue is being boosted */
-- struct bfq_entity *entity = &bfqq->entity;
--
- bfq_log_bfqq(bfqd, bfqq,
- "raising period dur %u/%u msec, "
- "old raising coeff %u, w %d(%d)",
-@@ -1818,7 +2007,7 @@ static void bfq_update_raising_data(struct bfq_data *bfqd,
- "WARN: pending prio change");
- /*
- * If too much time has elapsed from the beginning
-- * of this weight-raising, stop it.
-+ * of this weight-raising period, stop it.
- */
- if (jiffies - bfqq->last_rais_start_finish >
- bfqq->raising_cur_max_time) {
-@@ -1830,11 +2019,13 @@ static void bfq_update_raising_data(struct bfq_data *bfqd,
- jiffies_to_msecs(bfqq->
- raising_cur_max_time));
- bfq_bfqq_end_raising(bfqq);
-- __bfq_entity_update_weight_prio(
-- bfq_entity_service_tree(entity),
-- entity);
- }
- }
-+ /* Update weight both if it must be raised and if it must be lowered */
-+ if ((entity->weight > entity->orig_weight) != (bfqq->raising_coeff > 1))
-+ __bfq_entity_update_weight_prio(
-+ bfq_entity_service_tree(entity),
-+ entity);
- }
-
- /*
-@@ -2075,6 +2266,25 @@ static void bfq_init_icq(struct io_cq *icq)
- struct bfq_io_cq *bic = icq_to_bic(icq);
-
- bic->ttime.last_end_request = jiffies;
-+ /*
-+ * A newly created bic indicates that the process has just
-+ * started doing I/O, and is probably mapping into memory its
-+ * executable and libraries: it definitely needs weight raising.
-+ * There is however the possibility that the process performs,
-+ * for a while, I/O close to some other process. EQM intercepts
-+ * this behavior and may merge the queue corresponding to the
-+ * process with some other queue, BEFORE the weight of the queue
-+ * is raised. Merged queues are not weight-raised (they are assumed
-+ * to belong to processes that benefit only from high throughput).
-+ * If the merge is basically the consequence of an accident, then
-+ * the queue will be split soon and will get back its old weight.
-+ * It is then important to write down somewhere that this queue
-+ * does need weight raising, even if it did not make it to get its
-+ * weight raised before being merged. To this purpose, we overload
-+ * the field raising_time_left and assign 1 to it, to mark the queue
-+ * as needing weight raising.
-+ */
-+ bic->raising_time_left = 1;
- }
-
- static void bfq_exit_icq(struct io_cq *icq)
-@@ -2088,6 +2298,13 @@ static void bfq_exit_icq(struct io_cq *icq)
- }
-
- if (bic->bfqq[BLK_RW_SYNC]) {
-+ /*
-+ * If the bic is using a shared queue, put the reference
-+ * taken on the io_context when the bic started using a
-+ * shared bfq_queue.
-+ */
-+ if (bfq_bfqq_coop(bic->bfqq[BLK_RW_SYNC]))
-+ put_io_context(icq->ioc);
- bfq_exit_bfqq(bfqd, bic->bfqq[BLK_RW_SYNC]);
- bic->bfqq[BLK_RW_SYNC] = NULL;
- }
-@@ -2375,6 +2592,10 @@ static void bfq_update_idle_window(struct bfq_data *bfqd,
- if (!bfq_bfqq_sync(bfqq) || bfq_class_idle(bfqq))
- return;
-
-+ /* Idle window just restored, statistics are meaningless. */
-+ if (bfq_bfqq_just_split(bfqq))
-+ return;
-+
- enable_idle = bfq_bfqq_idle_window(bfqq);
-
- if (atomic_read(&bic->icq.ioc->active_ref) == 0 ||
-@@ -2415,6 +2636,7 @@ static void bfq_rq_enqueued(struct bfq_data *bfqd, struct bfq_queue *bfqq,
- if (bfqq->entity.service > bfq_max_budget(bfqd) / 8 ||
- !BFQQ_SEEKY(bfqq))
- bfq_update_idle_window(bfqd, bfqq, bic);
-+ bfq_clear_bfqq_just_split(bfqq);
-
- bfq_log_bfqq(bfqd, bfqq,
- "rq_enqueued: idle_window=%d (seeky %d, mean %llu)",
-@@ -2475,13 +2697,48 @@ static void bfq_rq_enqueued(struct bfq_data *bfqd, struct bfq_queue *bfqq,
- static void bfq_insert_request(struct request_queue *q, struct request *rq)
- {
- struct bfq_data *bfqd = q->elevator->elevator_data;
-- struct bfq_queue *bfqq = RQ_BFQQ(rq);
-+ struct bfq_queue *bfqq = RQ_BFQQ(rq), *new_bfqq;
-
- assert_spin_locked(bfqd->queue->queue_lock);
-+
-+ /*
-+ * An unplug may trigger a requeue of a request from the device
-+ * driver: make sure we are in process context while trying to
-+ * merge two bfq_queues.
-+ */
-+ if (!in_interrupt()) {
-+ new_bfqq = bfq_setup_cooperator(bfqd, bfqq, rq, true);
-+ if (new_bfqq != NULL) {
-+ if (bic_to_bfqq(RQ_BIC(rq), 1) != bfqq)
-+ new_bfqq = bic_to_bfqq(RQ_BIC(rq), 1);
-+ /*
-+ * Release the request's reference to the old bfqq
-+ * and make sure one is taken to the shared queue.
-+ */
-+ new_bfqq->allocated[rq_data_dir(rq)]++;
-+ bfqq->allocated[rq_data_dir(rq)]--;
-+ atomic_inc(&new_bfqq->ref);
-+ bfq_put_queue(bfqq);
-+ if (bic_to_bfqq(RQ_BIC(rq), 1) == bfqq)
-+ bfq_merge_bfqqs(bfqd, RQ_BIC(rq),
-+ bfqq, new_bfqq);
-+ rq->elv.priv[1] = new_bfqq;
-+ bfqq = new_bfqq;
-+ }
-+ }
-+
- bfq_init_prio_data(bfqq, RQ_BIC(rq));
-
- bfq_add_rq_rb(rq);
-
-+ /*
-+ * Here a newly-created bfq_queue has already started a weight-raising
-+ * period: clear raising_time_left to prevent bfq_bfqq_save_state()
-+ * from assigning it a full weight-raising period. See the detailed
-+ * comments about this field in bfq_init_icq().
-+ */
-+ if (bfqq->bic != NULL)
-+ bfqq->bic->raising_time_left = 0;
- rq_set_fifo_time(rq, jiffies + bfqd->bfq_fifo_expire[rq_is_sync(rq)]);
- list_add_tail(&rq->queuelist, &bfqq->fifo);
-
-@@ -2629,18 +2886,6 @@ static void bfq_put_request(struct request *rq)
- }
- }
-
--static struct bfq_queue *
--bfq_merge_bfqqs(struct bfq_data *bfqd, struct bfq_io_cq *bic,
-- struct bfq_queue *bfqq)
--{
-- bfq_log_bfqq(bfqd, bfqq, "merging with queue %lu",
-- (long unsigned)bfqq->new_bfqq->pid);
-- bic_set_bfqq(bic, bfqq->new_bfqq, 1);
-- bfq_mark_bfqq_coop(bfqq->new_bfqq);
-- bfq_put_queue(bfqq);
-- return bic_to_bfqq(bic, 1);
--}
--
- /*
- * Returns NULL if a new bfqq should be allocated, or the old bfqq if this
- * was the last process referring to said bfqq.
-@@ -2649,6 +2894,9 @@ static struct bfq_queue *
- bfq_split_bfqq(struct bfq_io_cq *bic, struct bfq_queue *bfqq)
- {
- bfq_log_bfqq(bfqq->bfqd, bfqq, "splitting queue");
-+
-+ put_io_context(bic->icq.ioc);
-+
- if (bfqq_process_refs(bfqq) == 1) {
- bfqq->pid = current->pid;
- bfq_clear_bfqq_coop(bfqq);
-@@ -2677,6 +2925,7 @@ static int bfq_set_request(struct request_queue *q, struct request *rq,
- struct bfq_queue *bfqq;
- struct bfq_group *bfqg;
- unsigned long flags;
-+ bool split = false;
-
- might_sleep_if(gfp_mask & __GFP_WAIT);
-
-@@ -2695,24 +2944,14 @@ new_queue:
- bfqq = bfq_get_queue(bfqd, bfqg, is_sync, bic, gfp_mask);
- bic_set_bfqq(bic, bfqq, is_sync);
- } else {
-- /*
-- * If the queue was seeky for too long, break it apart.
-- */
-+ /* If the queue was seeky for too long, break it apart. */
- if (bfq_bfqq_coop(bfqq) && bfq_bfqq_split_coop(bfqq)) {
- bfq_log_bfqq(bfqd, bfqq, "breaking apart bfqq");
- bfqq = bfq_split_bfqq(bic, bfqq);
-+ split = true;
- if (!bfqq)
- goto new_queue;
- }
--
-- /*
-- * Check to see if this queue is scheduled to merge with
-- * another closely cooperating queue. The merging of queues
-- * happens here as it must be done in process context.
-- * The reference on new_bfqq was taken in merge_bfqqs.
-- */
-- if (bfqq->new_bfqq != NULL)
-- bfqq = bfq_merge_bfqqs(bfqd, bic, bfqq);
- }
-
- bfqq->allocated[rw]++;
-@@ -2723,6 +2962,26 @@ new_queue:
- rq->elv.priv[0] = bic;
- rq->elv.priv[1] = bfqq;
-
-+ /*
-+ * If a bfq_queue has only one process reference, it is owned
-+ * by only one bfq_io_cq: we can set the bic field of the
-+ * bfq_queue to the address of that structure. Also, if the
-+ * queue has just been split, mark a flag so that the
-+ * information is available to the other scheduler hooks.
-+ */
-+ if (bfqq_process_refs(bfqq) == 1) {
-+ bfqq->bic = bic;
-+ if (split) {
-+ bfq_mark_bfqq_just_split(bfqq);
-+ /*
-+ * If the queue has just been split from a shared queue,
-+ * restore the idle window and the possible weight
-+ * raising period.
-+ */
-+ bfq_bfqq_resume_state(bfqq, bic);
-+ }
-+ }
-+
- spin_unlock_irqrestore(q->queue_lock, flags);
-
- return 0;
-diff --git a/block/bfq-sched.c b/block/bfq-sched.c
-index 30df81c..47e66a8 100644
---- a/block/bfq-sched.c
-+++ b/block/bfq-sched.c
-@@ -979,34 +979,6 @@ static struct bfq_queue *bfq_get_next_queue(struct bfq_data *bfqd)
- return bfqq;
- }
-
--/*
-- * Forced extraction of the given queue.
-- */
--static void bfq_get_next_queue_forced(struct bfq_data *bfqd,
-- struct bfq_queue *bfqq)
--{
-- struct bfq_entity *entity;
-- struct bfq_sched_data *sd;
--
-- BUG_ON(bfqd->in_service_queue != NULL);
--
-- entity = &bfqq->entity;
-- /*
-- * Bubble up extraction/update from the leaf to the root.
-- */
-- for_each_entity(entity) {
-- sd = entity->sched_data;
-- bfq_update_budget(entity);
-- bfq_update_vtime(bfq_entity_service_tree(entity));
-- bfq_active_extract(bfq_entity_service_tree(entity), entity);
-- sd->active_entity = entity;
-- sd->next_active = NULL;
-- entity->service = 0;
-- }
--
-- return;
--}
--
- static void __bfq_bfqd_reset_in_service(struct bfq_data *bfqd)
- {
- if (bfqd->in_service_bic != NULL) {
-diff --git a/block/bfq.h b/block/bfq.h
-index 78da7d2..b6ebc1d 100644
---- a/block/bfq.h
-+++ b/block/bfq.h
-@@ -192,6 +192,8 @@ struct bfq_group;
- * idle to backlogged
- * @service_from_backlogged: cumulative service received from the @bfq_queue
- * since the last transition from idle to backlogged
-+ * @bic: pointer to the bfq_io_cq owning the bfq_queue, set to %NULL if the
-+ * queue is shared
- *
- * A bfq_queue is a leaf request queue; it can be associated to an io_context
- * or more (if it is an async one). @cgroup holds a reference to the
-@@ -235,6 +237,7 @@ struct bfq_queue {
- sector_t last_request_pos;
-
- pid_t pid;
-+ struct bfq_io_cq *bic;
-
- /* weight-raising fields */
- unsigned int raising_cur_max_time;
-@@ -264,12 +267,23 @@ struct bfq_ttime {
- * @icq: associated io_cq structure
- * @bfqq: array of two process queues, the sync and the async
- * @ttime: associated @bfq_ttime struct
-+ * @raising_time_left: snapshot of the time left before weight raising ends
-+ * for the sync queue associated to this process; this
-+ * snapshot is taken to remember this value while the weight
-+ * raising is suspended because the queue is merged with a
-+ * shared queue, and is used to set @raising_cur_max_time
-+ * when the queue is split from the shared queue and its
-+ * weight is raised again
-+ * @saved_idle_window: same purpose as the previous field for the idle window
- */
- struct bfq_io_cq {
- struct io_cq icq; /* must be the first member */
- struct bfq_queue *bfqq[2];
- struct bfq_ttime ttime;
- int ioprio;
-+
-+ unsigned int raising_time_left;
-+ unsigned int saved_idle_window;
- };
-
- /**
-@@ -411,6 +425,7 @@ enum bfqq_state_flags {
- BFQ_BFQQ_FLAG_budget_new, /* no completion with this budget */
- BFQ_BFQQ_FLAG_coop, /* bfqq is shared */
- BFQ_BFQQ_FLAG_split_coop, /* shared bfqq will be splitted */
-+ BFQ_BFQQ_FLAG_just_split, /* queue has just been split */
- BFQ_BFQQ_FLAG_softrt_update, /* needs softrt-next-start update */
- };
-
-@@ -438,6 +453,7 @@ BFQ_BFQQ_FNS(sync);
- BFQ_BFQQ_FNS(budget_new);
- BFQ_BFQQ_FNS(coop);
- BFQ_BFQQ_FNS(split_coop);
-+BFQ_BFQQ_FNS(just_split);
- BFQ_BFQQ_FNS(softrt_update);
- #undef BFQ_BFQQ_FNS
-
---
-1.8.5.2
-
diff --git a/sys-kernel/kogaion-sources/files/desktop/3.10-ck1.patch b/sys-kernel/kogaion-sources/files/desktop/3.10-ck1.patch
deleted file mode 100644
index 1a9feb96..00000000
--- a/sys-kernel/kogaion-sources/files/desktop/3.10-ck1.patch
+++ /dev/null
@@ -1,8732 +0,0 @@
-// patch-3.10-ck1.patch
-Index: linux-3.10-ck1/arch/powerpc/platforms/cell/spufs/sched.c
-===================================================================
---- linux-3.10-ck1.orig/arch/powerpc/platforms/cell/spufs/sched.c 2013-07-09 17:28:57.209502080 +1000
-+++ linux-3.10-ck1/arch/powerpc/platforms/cell/spufs/sched.c 2013-07-09 17:29:00.837501924 +1000
-@@ -64,11 +64,6 @@
- static struct timer_list spuloadavg_timer;
-
- /*
-- * Priority of a normal, non-rt, non-niced'd process (aka nice level 0).
-- */
--#define NORMAL_PRIO 120
--
--/*
- * Frequency of the spu scheduler tick. By default we do one SPU scheduler
- * tick for every 10 CPU scheduler ticks.
- */
-Index: linux-3.10-ck1/Documentation/scheduler/sched-BFS.txt
-===================================================================
---- /dev/null 1970-01-01 00:00:00.000000000 +0000
-+++ linux-3.10-ck1/Documentation/scheduler/sched-BFS.txt 2013-07-09 17:29:00.837501924 +1000
-@@ -0,0 +1,347 @@
-+BFS - The Brain Fuck Scheduler by Con Kolivas.
-+
-+Goals.
-+
-+The goal of the Brain Fuck Scheduler, referred to as BFS from here on, is to
-+completely do away with the complex designs of the past for the cpu process
-+scheduler and instead implement one that is very simple in basic design.
-+The main focus of BFS is to achieve excellent desktop interactivity and
-+responsiveness without heuristics and tuning knobs that are difficult to
-+understand, impossible to model and predict the effect of, and when tuned to
-+one workload cause massive detriment to another.
-+
-+
-+Design summary.
-+
-+BFS is best described as a single runqueue, O(n) lookup, earliest effective
-+virtual deadline first design, loosely based on EEVDF (earliest eligible virtual
-+deadline first) and my previous Staircase Deadline scheduler. Each component
-+shall be described in order to understand the significance of, and reasoning for
-+it. The codebase when the first stable version was released was approximately
-+9000 lines less code than the existing mainline linux kernel scheduler (in
-+2.6.31). This does not even take into account the removal of documentation and
-+the cgroups code that is not used.
-+
-+Design reasoning.
-+
-+The single runqueue refers to the queued but not running processes for the
-+entire system, regardless of the number of CPUs. The reason for going back to
-+a single runqueue design is that once multiple runqueues are introduced,
-+per-CPU or otherwise, there will be complex interactions as each runqueue will
-+be responsible for the scheduling latency and fairness of the tasks only on its
-+own runqueue, and to achieve fairness and low latency across multiple CPUs, any
-+advantage in throughput of having CPU local tasks causes other disadvantages.
-+This is due to requiring a very complex balancing system to at best achieve some
-+semblance of fairness across CPUs and can only maintain relatively low latency
-+for tasks bound to the same CPUs, not across them. To increase said fairness
-+and latency across CPUs, the advantage of local runqueue locking, which makes
-+for better scalability, is lost due to having to grab multiple locks.
-+
-+A significant feature of BFS is that all accounting is done purely based on CPU
-+used and nowhere is sleep time used in any way to determine entitlement or
-+interactivity. Interactivity "estimators" that use some kind of sleep/run
-+algorithm are doomed to fail to detect all interactive tasks, and to falsely tag
-+tasks that aren't interactive as being so. The reason for this is that it is
-+close to impossible to determine that when a task is sleeping, whether it is
-+doing it voluntarily, as in a userspace application waiting for input in the
-+form of a mouse click or otherwise, or involuntarily, because it is waiting for
-+another thread, process, I/O, kernel activity or whatever. Thus, such an
-+estimator will introduce corner cases, and more heuristics will be required to
-+cope with those corner cases, introducing more corner cases and failed
-+interactivity detection and so on. Interactivity in BFS is built into the design
-+by virtue of the fact that tasks that are waking up have not used up their quota
-+of CPU time, and have earlier effective deadlines, thereby making it very likely
-+they will preempt any CPU bound task of equivalent nice level. See below for
-+more information on the virtual deadline mechanism. Even if they do not preempt
-+a running task, because the rr interval is guaranteed to have a bound upper
-+limit on how long a task will wait for, it will be scheduled within a timeframe
-+that will not cause visible interface jitter.
-+
-+
-+Design details.
-+
-+Task insertion.
-+
-+BFS inserts tasks into each relevant queue as an O(1) insertion into a double
-+linked list. On insertion, *every* running queue is checked to see if the newly
-+queued task can run on any idle queue, or preempt the lowest running task on the
-+system. This is how the cross-CPU scheduling of BFS achieves significantly lower
-+latency per extra CPU the system has. In this case the lookup is, in the worst
-+case scenario, O(n) where n is the number of CPUs on the system.
-+
-+Data protection.
-+
-+BFS has one single lock protecting the process local data of every task in the
-+global queue. Thus every insertion, removal and modification of task data in the
-+global runqueue needs to grab the global lock. However, once a task is taken by
-+a CPU, the CPU has its own local data copy of the running process' accounting
-+information which only that CPU accesses and modifies (such as during a
-+timer tick) thus allowing the accounting data to be updated lockless. Once a
-+CPU has taken a task to run, it removes it from the global queue. Thus the
-+global queue only ever has, at most,
-+
-+ (number of tasks requesting cpu time) - (number of logical CPUs) + 1
-+
-+tasks in the global queue. This value is relevant for the time taken to look up
-+tasks during scheduling. This will increase if many tasks with CPU affinity set
-+in their policy to limit which CPUs they're allowed to run on if they outnumber
-+the number of CPUs. The +1 is because when rescheduling a task, the CPU's
-+currently running task is put back on the queue. Lookup will be described after
-+the virtual deadline mechanism is explained.
-+
-+Virtual deadline.
-+
-+The key to achieving low latency, scheduling fairness, and "nice level"
-+distribution in BFS is entirely in the virtual deadline mechanism. The one
-+tunable in BFS is the rr_interval, or "round robin interval". This is the
-+maximum time two SCHED_OTHER (or SCHED_NORMAL, the common scheduling policy)
-+tasks of the same nice level will be running for, or looking at it the other
-+way around, the longest duration two tasks of the same nice level will be
-+delayed for. When a task requests cpu time, it is given a quota (time_slice)
-+equal to the rr_interval and a virtual deadline. The virtual deadline is
-+offset from the current time in jiffies by this equation:
-+
-+ jiffies + (prio_ratio * rr_interval)
-+
-+The prio_ratio is determined as a ratio compared to the baseline of nice -20
-+and increases by 10% per nice level. The deadline is a virtual one only in that
-+no guarantee is placed that a task will actually be scheduled by this time, but
-+it is used to compare which task should go next. There are three components to
-+how a task is next chosen. First is time_slice expiration. If a task runs out
-+of its time_slice, it is descheduled, the time_slice is refilled, and the
-+deadline reset to that formula above. Second is sleep, where a task no longer
-+is requesting CPU for whatever reason. The time_slice and deadline are _not_
-+adjusted in this case and are just carried over for when the task is next
-+scheduled. Third is preemption, and that is when a newly waking task is deemed
-+higher priority than a currently running task on any cpu by virtue of the fact
-+that it has an earlier virtual deadline than the currently running task. The
-+earlier deadline is the key to which task is next chosen for the first and
-+second cases. Once a task is descheduled, it is put back on the queue, and an
-+O(n) lookup of all queued-but-not-running tasks is done to determine which has
-+the earliest deadline and that task is chosen to receive CPU next.
-+
-+The CPU proportion of different nice tasks works out to be approximately the
-+
-+ (prio_ratio difference)^2
-+
-+The reason it is squared is that a task's deadline does not change while it is
-+running unless it runs out of time_slice. Thus, even if the time actually
-+passes the deadline of another task that is queued, it will not get CPU time
-+unless the current running task deschedules, and the time "base" (jiffies) is
-+constantly moving.
-+
-+Task lookup.
-+
-+BFS has 103 priority queues. 100 of these are dedicated to the static priority
-+of realtime tasks, and the remaining 3 are, in order of best to worst priority,
-+SCHED_ISO (isochronous), SCHED_NORMAL, and SCHED_IDLEPRIO (idle priority
-+scheduling). When a task of these priorities is queued, a bitmap of running
-+priorities is set showing which of these priorities has tasks waiting for CPU
-+time. When a CPU is made to reschedule, the lookup for the next task to get
-+CPU time is performed in the following way:
-+
-+First the bitmap is checked to see what static priority tasks are queued. If
-+any realtime priorities are found, the corresponding queue is checked and the
-+first task listed there is taken (provided CPU affinity is suitable) and lookup
-+is complete. If the priority corresponds to a SCHED_ISO task, they are also
-+taken in FIFO order (as they behave like SCHED_RR). If the priority corresponds
-+to either SCHED_NORMAL or SCHED_IDLEPRIO, then the lookup becomes O(n). At this
-+stage, every task in the runlist that corresponds to that priority is checked
-+to see which has the earliest set deadline, and (provided it has suitable CPU
-+affinity) it is taken off the runqueue and given the CPU. If a task has an
-+expired deadline, it is taken and the rest of the lookup aborted (as they are
-+chosen in FIFO order).
-+
-+Thus, the lookup is O(n) in the worst case only, where n is as described
-+earlier, as tasks may be chosen before the whole task list is looked over.
-+
-+
-+Scalability.
-+
-+The major limitations of BFS will be that of scalability, as the separate
-+runqueue designs will have less lock contention as the number of CPUs rises.
-+However they do not scale linearly even with separate runqueues as multiple
-+runqueues will need to be locked concurrently on such designs to be able to
-+achieve fair CPU balancing, to try and achieve some sort of nice-level fairness
-+across CPUs, and to achieve low enough latency for tasks on a busy CPU when
-+other CPUs would be more suited. BFS has the advantage that it requires no
-+balancing algorithm whatsoever, as balancing occurs by proxy simply because
-+all CPUs draw off the global runqueue, in priority and deadline order. Despite
-+the fact that scalability is _not_ the prime concern of BFS, it both shows very
-+good scalability to smaller numbers of CPUs and is likely a more scalable design
-+at these numbers of CPUs.
-+
-+It also has some very low overhead scalability features built into the design
-+when it has been deemed their overhead is so marginal that they're worth adding.
-+The first is the local copy of the running process' data to the CPU it's running
-+on to allow that data to be updated lockless where possible. Then there is
-+deference paid to the last CPU a task was running on, by trying that CPU first
-+when looking for an idle CPU to use the next time it's scheduled. Finally there
-+is the notion of "sticky" tasks that are flagged when they are involuntarily
-+descheduled, meaning they still want further CPU time. This sticky flag is
-+used to bias heavily against those tasks being scheduled on a different CPU
-+unless that CPU would be otherwise idle. When a cpu frequency governor is used
-+that scales with CPU load, such as ondemand, sticky tasks are not scheduled
-+on a different CPU at all, preferring instead to go idle. This means the CPU
-+they were bound to is more likely to increase its speed while the other CPU
-+will go idle, thus speeding up total task execution time and likely decreasing
-+power usage. This is the only scenario where BFS will allow a CPU to go idle
-+in preference to scheduling a task on the earliest available spare CPU.
-+
-+The real cost of migrating a task from one CPU to another is entirely dependant
-+on the cache footprint of the task, how cache intensive the task is, how long
-+it's been running on that CPU to take up the bulk of its cache, how big the CPU
-+cache is, how fast and how layered the CPU cache is, how fast a context switch
-+is... and so on. In other words, it's close to random in the real world where we
-+do more than just one sole workload. The only thing we can be sure of is that
-+it's not free. So BFS uses the principle that an idle CPU is a wasted CPU and
-+utilising idle CPUs is more important than cache locality, and cache locality
-+only plays a part after that.
-+
-+When choosing an idle CPU for a waking task, the cache locality is determined
-+according to where the task last ran and then idle CPUs are ranked from best
-+to worst to choose the most suitable idle CPU based on cache locality, NUMA
-+node locality and hyperthread sibling business. They are chosen in the
-+following preference (if idle):
-+
-+* Same core, idle or busy cache, idle threads
-+* Other core, same cache, idle or busy cache, idle threads.
-+* Same node, other CPU, idle cache, idle threads.
-+* Same node, other CPU, busy cache, idle threads.
-+* Same core, busy threads.
-+* Other core, same cache, busy threads.
-+* Same node, other CPU, busy threads.
-+* Other node, other CPU, idle cache, idle threads.
-+* Other node, other CPU, busy cache, idle threads.
-+* Other node, other CPU, busy threads.
-+
-+This shows the SMT or "hyperthread" awareness in the design as well which will
-+choose a real idle core first before a logical SMT sibling which already has
-+tasks on the physical CPU.
-+
-+Early benchmarking of BFS suggested scalability dropped off at the 16 CPU mark.
-+However this benchmarking was performed on an earlier design that was far less
-+scalable than the current one so it's hard to know how scalable it is in terms
-+of both CPUs (due to the global runqueue) and heavily loaded machines (due to
-+O(n) lookup) at this stage. Note that in terms of scalability, the number of
-+_logical_ CPUs matters, not the number of _physical_ CPUs. Thus, a dual (2x)
-+quad core (4X) hyperthreaded (2X) machine is effectively a 16X. Newer benchmark
-+results are very promising indeed, without needing to tweak any knobs, features
-+or options. Benchmark contributions are most welcome.
-+
-+
-+Features
-+
-+As the initial prime target audience for BFS was the average desktop user, it
-+was designed to not need tweaking, tuning or have features set to obtain benefit
-+from it. Thus the number of knobs and features has been kept to an absolute
-+minimum and should not require extra user input for the vast majority of cases.
-+There are precisely 2 tunables, and 2 extra scheduling policies. The rr_interval
-+and iso_cpu tunables, and the SCHED_ISO and SCHED_IDLEPRIO policies. In addition
-+to this, BFS also uses sub-tick accounting. What BFS does _not_ now feature is
-+support for CGROUPS. The average user should neither need to know what these
-+are, nor should they need to be using them to have good desktop behaviour.
-+
-+rr_interval
-+
-+There is only one "scheduler" tunable, the round robin interval. This can be
-+accessed in
-+
-+ /proc/sys/kernel/rr_interval
-+
-+The value is in milliseconds, and the default value is set to 6ms. Valid values
-+are from 1 to 1000. Decreasing the value will decrease latencies at the cost of
-+decreasing throughput, while increasing it will improve throughput, but at the
-+cost of worsening latencies. The accuracy of the rr interval is limited by HZ
-+resolution of the kernel configuration. Thus, the worst case latencies are
-+usually slightly higher than this actual value. BFS uses "dithering" to try and
-+minimise the effect the Hz limitation has. The default value of 6 is not an
-+arbitrary one. It is based on the fact that humans can detect jitter at
-+approximately 7ms, so aiming for much lower latencies is pointless under most
-+circumstances. It is worth noting this fact when comparing the latency
-+performance of BFS to other schedulers. Worst case latencies being higher than
-+7ms are far worse than average latencies not being in the microsecond range.
-+Experimentation has shown that rr intervals being increased up to 300 can
-+improve throughput but beyond that, scheduling noise from elsewhere prevents
-+further demonstrable throughput.
-+
-+Isochronous scheduling.
-+
-+Isochronous scheduling is a unique scheduling policy designed to provide
-+near-real-time performance to unprivileged (ie non-root) users without the
-+ability to starve the machine indefinitely. Isochronous tasks (which means
-+"same time") are set using, for example, the schedtool application like so:
-+
-+ schedtool -I -e amarok
-+
-+This will start the audio application "amarok" as SCHED_ISO. How SCHED_ISO works
-+is that it has a priority level between true realtime tasks and SCHED_NORMAL
-+which would allow them to preempt all normal tasks, in a SCHED_RR fashion (ie,
-+if multiple SCHED_ISO tasks are running, they purely round robin at rr_interval
-+rate). However if ISO tasks run for more than a tunable finite amount of time,
-+they are then demoted back to SCHED_NORMAL scheduling. This finite amount of
-+time is the percentage of _total CPU_ available across the machine, configurable
-+as a percentage in the following "resource handling" tunable (as opposed to a
-+scheduler tunable):
-+
-+ /proc/sys/kernel/iso_cpu
-+
-+and is set to 70% by default. It is calculated over a rolling 5 second average
-+Because it is the total CPU available, it means that on a multi CPU machine, it
-+is possible to have an ISO task running as realtime scheduling indefinitely on
-+just one CPU, as the other CPUs will be available. Setting this to 100 is the
-+equivalent of giving all users SCHED_RR access and setting it to 0 removes the
-+ability to run any pseudo-realtime tasks.
-+
-+A feature of BFS is that it detects when an application tries to obtain a
-+realtime policy (SCHED_RR or SCHED_FIFO) and the caller does not have the
-+appropriate privileges to use those policies. When it detects this, it will
-+give the task SCHED_ISO policy instead. Thus it is transparent to the user.
-+Because some applications constantly set their policy as well as their nice
-+level, there is potential for them to undo the override specified by the user
-+on the command line of setting the policy to SCHED_ISO. To counter this, once
-+a task has been set to SCHED_ISO policy, it needs superuser privileges to set
-+it back to SCHED_NORMAL. This will ensure the task remains ISO and all child
-+processes and threads will also inherit the ISO policy.
-+
-+Idleprio scheduling.
-+
-+Idleprio scheduling is a scheduling policy designed to give out CPU to a task
-+_only_ when the CPU would be otherwise idle. The idea behind this is to allow
-+ultra low priority tasks to be run in the background that have virtually no
-+effect on the foreground tasks. This is ideally suited to distributed computing
-+clients (like setiathome, folding, mprime etc) but can also be used to start
-+a video encode or so on without any slowdown of other tasks. To avoid this
-+policy from grabbing shared resources and holding them indefinitely, if it
-+detects a state where the task is waiting on I/O, the machine is about to
-+suspend to ram and so on, it will transiently schedule them as SCHED_NORMAL. As
-+per the Isochronous task management, once a task has been scheduled as IDLEPRIO,
-+it cannot be put back to SCHED_NORMAL without superuser privileges. Tasks can
-+be set to start as SCHED_IDLEPRIO with the schedtool command like so:
-+
-+ schedtool -D -e ./mprime
-+
-+Subtick accounting.
-+
-+It is surprisingly difficult to get accurate CPU accounting, and in many cases,
-+the accounting is done by simply determining what is happening at the precise
-+moment a timer tick fires off. This becomes increasingly inaccurate as the
-+timer tick frequency (HZ) is lowered. It is possible to create an application
-+which uses almost 100% CPU, yet by being descheduled at the right time, records
-+zero CPU usage. While the main problem with this is that there are possible
-+security implications, it is also difficult to determine how much CPU a task
-+really does use. BFS tries to use the sub-tick accounting from the TSC clock,
-+where possible, to determine real CPU usage. This is not entirely reliable, but
-+is far more likely to produce accurate CPU usage data than the existing designs
-+and will not show tasks as consuming no CPU usage when they actually are. Thus,
-+the amount of CPU reported as being used by BFS will more accurately represent
-+how much CPU the task itself is using (as is shown for example by the 'time'
-+application), so the reported values may be quite different to other schedulers.
-+Values reported as the 'load' are more prone to problems with this design, but
-+per process values are closer to real usage. When comparing throughput of BFS
-+to other designs, it is important to compare the actual completed work in terms
-+of total wall clock time taken and total work done, rather than the reported
-+"cpu usage".
-+
-+
-+Con Kolivas <kernel@kolivas.org> Tue, 5 Apr 2011
-Index: linux-3.10-ck1/Documentation/sysctl/kernel.txt
-===================================================================
---- linux-3.10-ck1.orig/Documentation/sysctl/kernel.txt 2013-07-09 17:28:57.123502084 +1000
-+++ linux-3.10-ck1/Documentation/sysctl/kernel.txt 2013-07-09 17:29:00.837501924 +1000
-@@ -33,6 +33,7 @@
- - domainname
- - hostname
- - hotplug
-+- iso_cpu
- - kptr_restrict
- - kstack_depth_to_print [ X86 only ]
- - l2cr [ PPC only ]
-@@ -60,6 +61,7 @@
- - randomize_va_space
- - real-root-dev ==> Documentation/initrd.txt
- - reboot-cmd [ SPARC only ]
-+- rr_interval
- - rtsig-max
- - rtsig-nr
- - sem
-@@ -306,6 +308,16 @@
-
- ==============================================================
-
-+iso_cpu: (BFS CPU scheduler only).
-+
-+This sets the percentage cpu that the unprivileged SCHED_ISO tasks can
-+run effectively at realtime priority, averaged over a rolling five
-+seconds over the -whole- system, meaning all cpus.
-+
-+Set to 70 (percent) by default.
-+
-+==============================================================
-+
- l2cr: (PPC only)
-
- This flag controls the L2 cache of G3 processor boards. If
-@@ -538,6 +550,20 @@
-
- ==============================================================
-
-+rr_interval: (BFS CPU scheduler only)
-+
-+This is the smallest duration that any cpu process scheduling unit
-+will run for. Increasing this value can increase throughput of cpu
-+bound tasks substantially but at the expense of increased latencies
-+overall. Conversely decreasing it will decrease average and maximum
-+latencies but at the expense of throughput. This value is in
-+milliseconds and the default value chosen depends on the number of
-+cpus available at scheduler initialisation with a minimum of 6.
-+
-+Valid values are from 1-1000.
-+
-+==============================================================
-+
- rtsig-max & rtsig-nr:
-
- The file rtsig-max can be used to tune the maximum number
-Index: linux-3.10-ck1/fs/proc/base.c
-===================================================================
---- linux-3.10-ck1.orig/fs/proc/base.c 2013-07-09 17:28:57.169502082 +1000
-+++ linux-3.10-ck1/fs/proc/base.c 2013-07-09 17:29:00.838501924 +1000
-@@ -339,7 +339,7 @@
- static int proc_pid_schedstat(struct task_struct *task, char *buffer)
- {
- return sprintf(buffer, "%llu %llu %lu\n",
-- (unsigned long long)task->se.sum_exec_runtime,
-+ (unsigned long long)tsk_seruntime(task),
- (unsigned long long)task->sched_info.run_delay,
- task->sched_info.pcount);
- }
-Index: linux-3.10-ck1/include/linux/init_task.h
-===================================================================
---- linux-3.10-ck1.orig/include/linux/init_task.h 2013-07-09 17:28:57.154502083 +1000
-+++ linux-3.10-ck1/include/linux/init_task.h 2013-07-09 17:29:00.838501924 +1000
-@@ -152,12 +152,70 @@
- # define INIT_VTIME(tsk)
- #endif
-
--#define INIT_TASK_COMM "swapper"
--
- /*
- * INIT_TASK is used to set up the first task table, touch at
- * your own risk!. Base=0, limit=0x1fffff (=2MB)
- */
-+#ifdef CONFIG_SCHED_BFS
-+#define INIT_TASK_COMM "BFS"
-+#define INIT_TASK(tsk) \
-+{ \
-+ .state = 0, \
-+ .stack = &init_thread_info, \
-+ .usage = ATOMIC_INIT(2), \
-+ .flags = PF_KTHREAD, \
-+ .prio = NORMAL_PRIO, \
-+ .static_prio = MAX_PRIO-20, \
-+ .normal_prio = NORMAL_PRIO, \
-+ .deadline = 0, \
-+ .policy = SCHED_NORMAL, \
-+ .cpus_allowed = CPU_MASK_ALL, \
-+ .mm = NULL, \
-+ .active_mm = &init_mm, \
-+ .run_list = LIST_HEAD_INIT(tsk.run_list), \
-+ .time_slice = HZ, \
-+ .tasks = LIST_HEAD_INIT(tsk.tasks), \
-+ INIT_PUSHABLE_TASKS(tsk) \
-+ .ptraced = LIST_HEAD_INIT(tsk.ptraced), \
-+ .ptrace_entry = LIST_HEAD_INIT(tsk.ptrace_entry), \
-+ .real_parent = &tsk, \
-+ .parent = &tsk, \
-+ .children = LIST_HEAD_INIT(tsk.children), \
-+ .sibling = LIST_HEAD_INIT(tsk.sibling), \
-+ .group_leader = &tsk, \
-+ RCU_POINTER_INITIALIZER(real_cred, &init_cred), \
-+ RCU_POINTER_INITIALIZER(cred, &init_cred), \
-+ .comm = INIT_TASK_COMM, \
-+ .thread = INIT_THREAD, \
-+ .fs = &init_fs, \
-+ .files = &init_files, \
-+ .signal = &init_signals, \
-+ .sighand = &init_sighand, \
-+ .nsproxy = &init_nsproxy, \
-+ .pending = { \
-+ .list = LIST_HEAD_INIT(tsk.pending.list), \
-+ .signal = {{0}}}, \
-+ .blocked = {{0}}, \
-+ .alloc_lock = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock), \
-+ .journal_info = NULL, \
-+ .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \
-+ .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \
-+ .timer_slack_ns = 50000, /* 50 usec default slack */ \
-+ .pids = { \
-+ [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \
-+ [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \
-+ [PIDTYPE_SID] = INIT_PID_LINK(PIDTYPE_SID), \
-+ }, \
-+ INIT_IDS \
-+ INIT_PERF_EVENTS(tsk) \
-+ INIT_TRACE_IRQFLAGS \
-+ INIT_LOCKDEP \
-+ INIT_FTRACE_GRAPH \
-+ INIT_TRACE_RECURSION \
-+ INIT_TASK_RCU_PREEMPT(tsk) \
-+}
-+#else /* CONFIG_SCHED_BFS */
-+#define INIT_TASK_COMM "swapper"
- #define INIT_TASK(tsk) \
- { \
- .state = 0, \
-@@ -223,7 +281,7 @@
- INIT_CPUSET_SEQ \
- INIT_VTIME(tsk) \
- }
--
-+#endif /* CONFIG_SCHED_BFS */
-
- #define INIT_CPU_TIMERS(cpu_timers) \
- { \
-Index: linux-3.10-ck1/include/linux/ioprio.h
-===================================================================
---- linux-3.10-ck1.orig/include/linux/ioprio.h 2013-07-09 17:28:57.146502083 +1000
-+++ linux-3.10-ck1/include/linux/ioprio.h 2013-07-09 17:29:00.838501924 +1000
-@@ -52,6 +52,8 @@
- */
- static inline int task_nice_ioprio(struct task_struct *task)
- {
-+ if (iso_task(task))
-+ return 0;
- return (task_nice(task) + 20) / 5;
- }
-
-Index: linux-3.10-ck1/include/linux/sched.h
-===================================================================
---- linux-3.10-ck1.orig/include/linux/sched.h 2013-07-09 17:28:57.163502082 +1000
-+++ linux-3.10-ck1/include/linux/sched.h 2013-07-09 17:29:00.839501924 +1000
-@@ -229,8 +229,6 @@
- extern void init_idle(struct task_struct *idle, int cpu);
- extern void init_idle_bootup_task(struct task_struct *idle);
-
--extern int runqueue_is_locked(int cpu);
--
- #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
- extern void nohz_balance_enter_idle(int cpu);
- extern void set_cpu_sd_state_idle(void);
-@@ -1040,18 +1038,35 @@
-
- #ifdef CONFIG_SMP
- struct llist_node wake_entry;
-- int on_cpu;
- #endif
-- int on_rq;
-+#if defined(CONFIG_SMP) || defined(CONFIG_SCHED_BFS)
-+ bool on_cpu;
-+#endif
-+#ifndef CONFIG_SCHED_BFS
-+ bool on_rq;
-+#endif
-
- int prio, static_prio, normal_prio;
- unsigned int rt_priority;
-+#ifdef CONFIG_SCHED_BFS
-+ int time_slice;
-+ u64 deadline;
-+ struct list_head run_list;
-+ u64 last_ran;
-+ u64 sched_time; /* sched_clock time spent running */
-+#ifdef CONFIG_SMP
-+ bool sticky; /* Soft affined flag */
-+#endif
-+ unsigned long rt_timeout;
-+#else /* CONFIG_SCHED_BFS */
- const struct sched_class *sched_class;
- struct sched_entity se;
- struct sched_rt_entity rt;
-+
- #ifdef CONFIG_CGROUP_SCHED
- struct task_group *sched_task_group;
- #endif
-+#endif
-
- #ifdef CONFIG_PREEMPT_NOTIFIERS
- /* list of struct preempt_notifier: */
-@@ -1162,6 +1177,9 @@
- int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
-
- cputime_t utime, stime, utimescaled, stimescaled;
-+#ifdef CONFIG_SCHED_BFS
-+ unsigned long utime_pc, stime_pc;
-+#endif
- cputime_t gtime;
- #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
- struct cputime prev_cputime;
-@@ -1418,6 +1436,64 @@
- #endif
- };
-
-+#ifdef CONFIG_SCHED_BFS
-+bool grunqueue_is_locked(void);
-+void grq_unlock_wait(void);
-+void cpu_scaling(int cpu);
-+void cpu_nonscaling(int cpu);
-+bool above_background_load(void);
-+#define tsk_seruntime(t) ((t)->sched_time)
-+#define tsk_rttimeout(t) ((t)->rt_timeout)
-+
-+static inline void tsk_cpus_current(struct task_struct *p)
-+{
-+}
-+
-+static inline int runqueue_is_locked(int cpu)
-+{
-+ return grunqueue_is_locked();
-+}
-+
-+void print_scheduler_version(void);
-+
-+static inline bool iso_task(struct task_struct *p)
-+{
-+ return (p->policy == SCHED_ISO);
-+}
-+#else /* CFS */
-+extern int runqueue_is_locked(int cpu);
-+static inline void cpu_scaling(int cpu)
-+{
-+}
-+
-+static inline void cpu_nonscaling(int cpu)
-+{
-+}
-+#define tsk_seruntime(t) ((t)->se.sum_exec_runtime)
-+#define tsk_rttimeout(t) ((t)->rt.timeout)
-+
-+static inline void tsk_cpus_current(struct task_struct *p)
-+{
-+ p->nr_cpus_allowed = current->nr_cpus_allowed;
-+}
-+
-+static inline void print_scheduler_version(void)
-+{
-+ printk(KERN_INFO"CFS CPU scheduler.\n");
-+}
-+
-+static inline bool iso_task(struct task_struct *p)
-+{
-+ return false;
-+}
-+
-+/* Anyone feel like implementing this? */
-+static inline bool above_background_load(void)
-+{
-+ return false;
-+}
-+#endif /* CONFIG_SCHED_BFS */
-+
- /* Future-safe accessor for struct task_struct's cpus_allowed. */
- #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
-
-@@ -1844,7 +1920,7 @@
- task_sched_runtime(struct task_struct *task);
-
- /* sched_exec is called by processes performing an exec */
--#ifdef CONFIG_SMP
-+#if defined(CONFIG_SMP) && !defined(CONFIG_SCHED_BFS)
- extern void sched_exec(void);
- #else
- #define sched_exec() {}
-@@ -2549,7 +2625,7 @@
- return 0;
- }
-
--static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
-+static inline void set_task_cpu(struct task_struct *p, int cpu)
- {
- }
-
-Index: linux-3.10-ck1/init/Kconfig
-===================================================================
---- linux-3.10-ck1.orig/init/Kconfig 2013-07-09 17:28:57.132502084 +1000
-+++ linux-3.10-ck1/init/Kconfig 2013-07-09 17:29:00.839501924 +1000
-@@ -28,6 +28,20 @@
-
- menu "General setup"
-
-+config SCHED_BFS
-+ bool "BFS cpu scheduler"
-+ ---help---
-+ The Brain Fuck CPU Scheduler for excellent interactivity and
-+ responsiveness on the desktop and solid scalability on normal
-+ hardware and commodity servers. Not recommended for 4096 CPUs.
-+
-+ Currently incompatible with the Group CPU scheduler, and RCU TORTURE
-+ TEST so these options are disabled.
-+
-+ Say Y here.
-+ default y
-+
-+
- config BROKEN
- bool
-
-@@ -302,7 +316,7 @@
- # Kind of a stub config for the pure tick based cputime accounting
- config TICK_CPU_ACCOUNTING
- bool "Simple tick based cputime accounting"
-- depends on !S390 && !NO_HZ_FULL
-+ depends on !S390 && !NO_HZ_FULL && !SCHED_BFS
- help
- This is the basic tick based cputime accounting that maintains
- statistics about user, system and idle time spent on per jiffies
-@@ -325,7 +339,7 @@
-
- config VIRT_CPU_ACCOUNTING_GEN
- bool "Full dynticks CPU time accounting"
-- depends on HAVE_CONTEXT_TRACKING && 64BIT
-+ depends on HAVE_CONTEXT_TRACKING && 64BIT && !SCHED_BFS
- select VIRT_CPU_ACCOUNTING
- select CONTEXT_TRACKING
- help
-@@ -795,6 +809,7 @@
- depends on ARCH_SUPPORTS_NUMA_BALANCING
- depends on !ARCH_WANT_NUMA_VARIABLE_LOCALITY
- depends on SMP && NUMA && MIGRATION
-+ depends on !SCHED_BFS
- help
- This option adds support for automatic NUMA aware memory/task placement.
- The mechanism is quite primitive and is based on migrating memory when
-@@ -857,6 +872,7 @@
-
- config CGROUP_CPUACCT
- bool "Simple CPU accounting cgroup subsystem"
-+ depends on !SCHED_BFS
- help
- Provides a simple Resource Controller for monitoring the
- total CPU consumed by the tasks in a cgroup.
-@@ -959,6 +975,7 @@
-
- menuconfig CGROUP_SCHED
- bool "Group CPU scheduler"
-+ depends on !SCHED_BFS
- default n
- help
- This feature lets CPU scheduler recognize task groups and control CPU
-@@ -1123,6 +1140,7 @@
-
- config SCHED_AUTOGROUP
- bool "Automatic process group scheduling"
-+ depends on !SCHED_BFS
- select EVENTFD
- select CGROUPS
- select CGROUP_SCHED
-@@ -1526,38 +1544,8 @@
-
- On non-ancient distros (post-2000 ones) N is usually a safe choice.
-
--choice
-- prompt "Choose SLAB allocator"
-- default SLUB
-- help
-- This option allows to select a slab allocator.
--
--config SLAB
-- bool "SLAB"
-- help
-- The regular slab allocator that is established and known to work
-- well in all environments. It organizes cache hot objects in
-- per cpu and per node queues.
--
- config SLUB
-- bool "SLUB (Unqueued Allocator)"
-- help
-- SLUB is a slab allocator that minimizes cache line usage
-- instead of managing queues of cached objects (SLAB approach).
-- Per cpu caching is realized using slabs of objects instead
-- of queues of objects. SLUB can use memory efficiently
-- and has enhanced diagnostics. SLUB is the default choice for
-- a slab allocator.
--
--config SLOB
-- depends on EXPERT
-- bool "SLOB (Simple Allocator)"
-- help
-- SLOB replaces the stock allocator with a drastically simpler
-- allocator. SLOB is generally more space efficient but
-- does not perform as well on large systems.
--
--endchoice
-+ def_bool y
-
- config MMAP_ALLOW_UNINITIALIZED
- bool "Allow mmapped anonymous memory to be uninitialized"
-Index: linux-3.10-ck1/init/main.c
-===================================================================
---- linux-3.10-ck1.orig/init/main.c 2013-07-09 17:28:57.127502084 +1000
-+++ linux-3.10-ck1/init/main.c 2013-07-09 17:29:00.839501924 +1000
-@@ -700,7 +700,6 @@
- return ret;
- }
-
--
- extern initcall_t __initcall_start[];
- extern initcall_t __initcall0_start[];
- extern initcall_t __initcall1_start[];
-@@ -820,6 +819,8 @@
-
- flush_delayed_fput();
-
-+ print_scheduler_version();
-+
- if (ramdisk_execute_command) {
- if (!run_init_process(ramdisk_execute_command))
- return 0;
-Index: linux-3.10-ck1/kernel/delayacct.c
-===================================================================
---- linux-3.10-ck1.orig/kernel/delayacct.c 2013-07-09 17:28:57.202502081 +1000
-+++ linux-3.10-ck1/kernel/delayacct.c 2013-07-09 17:29:00.839501924 +1000
-@@ -133,7 +133,7 @@
- */
- t1 = tsk->sched_info.pcount;
- t2 = tsk->sched_info.run_delay;
-- t3 = tsk->se.sum_exec_runtime;
-+ t3 = tsk_seruntime(tsk);
-
- d->cpu_count += t1;
-
-Index: linux-3.10-ck1/kernel/exit.c
-===================================================================
---- linux-3.10-ck1.orig/kernel/exit.c 2013-07-09 17:28:57.186502081 +1000
-+++ linux-3.10-ck1/kernel/exit.c 2013-07-09 17:29:00.839501924 +1000
-@@ -135,7 +135,7 @@
- sig->inblock += task_io_get_inblock(tsk);
- sig->oublock += task_io_get_oublock(tsk);
- task_io_accounting_add(&sig->ioac, &tsk->ioac);
-- sig->sum_sched_runtime += tsk->se.sum_exec_runtime;
-+ sig->sum_sched_runtime += tsk_seruntime(tsk);
- }
-
- sig->nr_threads--;
-Index: linux-3.10-ck1/kernel/posix-cpu-timers.c
-===================================================================
---- linux-3.10-ck1.orig/kernel/posix-cpu-timers.c 2013-07-09 17:28:57.182502082 +1000
-+++ linux-3.10-ck1/kernel/posix-cpu-timers.c 2013-07-09 17:29:00.840501924 +1000
-@@ -498,11 +498,11 @@
- {
- cputime_t utime, stime;
-
-- add_device_randomness((const void*) &tsk->se.sum_exec_runtime,
-+ add_device_randomness((const void*) &tsk_seruntime(tsk),
- sizeof(unsigned long long));
- task_cputime(tsk, &utime, &stime);
- cleanup_timers(tsk->cpu_timers,
-- utime, stime, tsk->se.sum_exec_runtime);
-+ utime, stime, tsk_seruntime(tsk));
-
- }
- void posix_cpu_timers_exit_group(struct task_struct *tsk)
-@@ -513,7 +513,7 @@
- task_cputime(tsk, &utime, &stime);
- cleanup_timers(tsk->signal->cpu_timers,
- utime + sig->utime, stime + sig->stime,
-- tsk->se.sum_exec_runtime + sig->sum_sched_runtime);
-+ tsk_seruntime(tsk) + sig->sum_sched_runtime);
- }
-
- static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now)
-@@ -976,7 +976,7 @@
- struct cpu_timer_list *t = list_first_entry(timers,
- struct cpu_timer_list,
- entry);
-- if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) {
-+ if (!--maxfire || tsk_seruntime(tsk) < t->expires.sched) {
- tsk->cputime_expires.sched_exp = t->expires.sched;
- break;
- }
-@@ -993,7 +993,7 @@
- ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_max);
-
- if (hard != RLIM_INFINITY &&
-- tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) {
-+ tsk_rttimeout(tsk) > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) {
- /*
- * At the hard limit, we just die.
- * No need to calculate anything else now.
-@@ -1001,7 +1001,7 @@
- __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk);
- return;
- }
-- if (tsk->rt.timeout > DIV_ROUND_UP(soft, USEC_PER_SEC/HZ)) {
-+ if (tsk_rttimeout(tsk) > DIV_ROUND_UP(soft, USEC_PER_SEC/HZ)) {
- /*
- * At the soft limit, send a SIGXCPU every second.
- */
-@@ -1282,7 +1282,7 @@
- struct task_cputime task_sample = {
- .utime = utime,
- .stime = stime,
-- .sum_exec_runtime = tsk->se.sum_exec_runtime
-+ .sum_exec_runtime = tsk_seruntime(tsk)
- };
-
- if (task_cputime_expired(&task_sample, &tsk->cputime_expires))
-Index: linux-3.10-ck1/kernel/sysctl.c
-===================================================================
---- linux-3.10-ck1.orig/kernel/sysctl.c 2013-07-09 17:28:57.173502082 +1000
-+++ linux-3.10-ck1/kernel/sysctl.c 2013-07-09 17:29:00.840501924 +1000
-@@ -128,7 +128,12 @@
- static int __maybe_unused two = 2;
- static int __maybe_unused three = 3;
- static unsigned long one_ul = 1;
--static int one_hundred = 100;
-+static int __maybe_unused one_hundred = 100;
-+#ifdef CONFIG_SCHED_BFS
-+extern int rr_interval;
-+extern int sched_iso_cpu;
-+static int __read_mostly one_thousand = 1000;
-+#endif
- #ifdef CONFIG_PRINTK
- static int ten_thousand = 10000;
- #endif
-@@ -256,7 +261,7 @@
- { }
- };
-
--#ifdef CONFIG_SCHED_DEBUG
-+#if defined(CONFIG_SCHED_DEBUG) && !defined(CONFIG_SCHED_BFS)
- static int min_sched_granularity_ns = 100000; /* 100 usecs */
- static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
- static int min_wakeup_granularity_ns; /* 0 usecs */
-@@ -273,6 +278,7 @@
- #endif
-
- static struct ctl_table kern_table[] = {
-+#ifndef CONFIG_SCHED_BFS
- {
- .procname = "sched_child_runs_first",
- .data = &sysctl_sched_child_runs_first,
-@@ -436,6 +442,7 @@
- .extra1 = &one,
- },
- #endif
-+#endif /* !CONFIG_SCHED_BFS */
- #ifdef CONFIG_PROVE_LOCKING
- {
- .procname = "prove_locking",
-@@ -907,6 +914,26 @@
- .proc_handler = proc_dointvec,
- },
- #endif
-+#ifdef CONFIG_SCHED_BFS
-+ {
-+ .procname = "rr_interval",
-+ .data = &rr_interval,
-+ .maxlen = sizeof (int),
-+ .mode = 0644,
-+ .proc_handler = &proc_dointvec_minmax,
-+ .extra1 = &one,
-+ .extra2 = &one_thousand,
-+ },
-+ {
-+ .procname = "iso_cpu",
-+ .data = &sched_iso_cpu,
-+ .maxlen = sizeof (int),
-+ .mode = 0644,
-+ .proc_handler = &proc_dointvec_minmax,
-+ .extra1 = &zero,
-+ .extra2 = &one_hundred,
-+ },
-+#endif
- #if defined(CONFIG_S390) && defined(CONFIG_SMP)
- {
- .procname = "spin_retry",
-Index: linux-3.10-ck1/lib/Kconfig.debug
-===================================================================
---- linux-3.10-ck1.orig/lib/Kconfig.debug 2013-07-09 17:28:57.137502083 +1000
-+++ linux-3.10-ck1/lib/Kconfig.debug 2013-07-09 17:29:00.840501924 +1000
-@@ -940,7 +940,7 @@
-
- config RCU_TORTURE_TEST
- tristate "torture tests for RCU"
-- depends on DEBUG_KERNEL
-+ depends on DEBUG_KERNEL && !SCHED_BFS
- default n
- help
- This option provides a kernel module that runs torture tests
-Index: linux-3.10-ck1/include/linux/jiffies.h
-===================================================================
---- linux-3.10-ck1.orig/include/linux/jiffies.h 2013-07-09 17:28:57.150502083 +1000
-+++ linux-3.10-ck1/include/linux/jiffies.h 2013-07-09 17:29:00.840501924 +1000
-@@ -159,7 +159,7 @@
- * Have the 32 bit jiffies value wrap 5 minutes after boot
- * so jiffies wrap bugs show up earlier.
- */
--#define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))
-+#define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-10*HZ))
-
- /*
- * Change timeval to jiffies, trying to avoid the
-Index: linux-3.10-ck1/drivers/cpufreq/cpufreq.c
-===================================================================
---- linux-3.10-ck1.orig/drivers/cpufreq/cpufreq.c 2013-07-09 17:28:57.224502080 +1000
-+++ linux-3.10-ck1/drivers/cpufreq/cpufreq.c 2013-07-09 17:29:00.841501924 +1000
-@@ -30,6 +30,7 @@
- #include <linux/cpu.h>
- #include <linux/completion.h>
- #include <linux/mutex.h>
-+#include <linux/sched.h>
- #include <linux/syscore_ops.h>
-
- #include <trace/events/power.h>
-@@ -1473,6 +1474,12 @@
-
- if (cpufreq_driver->target)
- retval = cpufreq_driver->target(policy, target_freq, relation);
-+ if (likely(retval != -EINVAL)) {
-+ if (target_freq == policy->max)
-+ cpu_nonscaling(policy->cpu);
-+ else
-+ cpu_scaling(policy->cpu);
-+ }
-
- return retval;
- }
-Index: linux-3.10-ck1/drivers/cpufreq/cpufreq_ondemand.c
-===================================================================
---- linux-3.10-ck1.orig/drivers/cpufreq/cpufreq_ondemand.c 2013-07-09 17:28:57.214502080 +1000
-+++ linux-3.10-ck1/drivers/cpufreq/cpufreq_ondemand.c 2013-07-09 17:29:00.841501924 +1000
-@@ -29,8 +29,8 @@
- #include "cpufreq_governor.h"
-
- /* On-demand governor macros */
--#define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10)
--#define DEF_FREQUENCY_UP_THRESHOLD (80)
-+#define DEF_FREQUENCY_DOWN_DIFFERENTIAL (26)
-+#define DEF_FREQUENCY_UP_THRESHOLD (63)
- #define DEF_SAMPLING_DOWN_FACTOR (1)
- #define MAX_SAMPLING_DOWN_FACTOR (100000)
- #define MICRO_FREQUENCY_DOWN_DIFFERENTIAL (3)
-@@ -160,10 +160,10 @@
- }
-
- /*
-- * Every sampling_rate, we check, if current idle time is less than 20%
-+ * Every sampling_rate, we check, if current idle time is less than 37%
- * (default), then we try to increase frequency. Every sampling_rate, we look
- * for the lowest frequency which can sustain the load while keeping idle time
-- * over 30%. If such a frequency exist, we try to decrease to this frequency.
-+ * over 63%. If such a frequency exist, we try to decrease to this frequency.
- *
- * Any frequency increase takes it to the maximum frequency. Frequency reduction
- * happens at minimum steps of 5% (default) of current frequency
-Index: linux-3.10-ck1/kernel/sched/bfs.c
-===================================================================
---- /dev/null 1970-01-01 00:00:00.000000000 +0000
-+++ linux-3.10-ck1/kernel/sched/bfs.c 2013-07-09 17:29:00.843501924 +1000
-@@ -0,0 +1,7423 @@
-+/*
-+ * kernel/sched/bfs.c, was kernel/sched.c
-+ *
-+ * Kernel scheduler and related syscalls
-+ *
-+ * Copyright (C) 1991-2002 Linus Torvalds
-+ *
-+ * 1996-12-23 Modified by Dave Grothe to fix bugs in semaphores and
-+ * make semaphores SMP safe
-+ * 1998-11-19 Implemented schedule_timeout() and related stuff
-+ * by Andrea Arcangeli
-+ * 2002-01-04 New ultra-scalable O(1) scheduler by Ingo Molnar:
-+ * hybrid priority-list and round-robin design with
-+ * an array-switch method of distributing timeslices
-+ * and per-CPU runqueues. Cleanups and useful suggestions
-+ * by Davide Libenzi, preemptible kernel bits by Robert Love.
-+ * 2003-09-03 Interactivity tuning by Con Kolivas.
-+ * 2004-04-02 Scheduler domains code by Nick Piggin
-+ * 2007-04-15 Work begun on replacing all interactivity tuning with a
-+ * fair scheduling design by Con Kolivas.
-+ * 2007-05-05 Load balancing (smp-nice) and other improvements
-+ * by Peter Williams
-+ * 2007-05-06 Interactivity improvements to CFS by Mike Galbraith
-+ * 2007-07-01 Group scheduling enhancements by Srivatsa Vaddagiri
-+ * 2007-11-29 RT balancing improvements by Steven Rostedt, Gregory Haskins,
-+ * Thomas Gleixner, Mike Kravetz
-+ * now Brainfuck deadline scheduling policy by Con Kolivas deletes
-+ * a whole lot of those previous things.
-+ */
-+
-+#include <linux/mm.h>
-+#include <linux/module.h>
-+#include <linux/nmi.h>
-+#include <linux/init.h>
-+#include <asm/uaccess.h>
-+#include <linux/highmem.h>
-+#include <asm/mmu_context.h>
-+#include <linux/interrupt.h>
-+#include <linux/capability.h>
-+#include <linux/completion.h>
-+#include <linux/kernel_stat.h>
-+#include <linux/debug_locks.h>
-+#include <linux/perf_event.h>
-+#include <linux/security.h>
-+#include <linux/notifier.h>
-+#include <linux/profile.h>
-+#include <linux/freezer.h>
-+#include <linux/vmalloc.h>
-+#include <linux/blkdev.h>
-+#include <linux/delay.h>
-+#include <linux/smp.h>
-+#include <linux/threads.h>
-+#include <linux/timer.h>
-+#include <linux/rcupdate.h>
-+#include <linux/cpu.h>
-+#include <linux/cpuset.h>
-+#include <linux/cpumask.h>
-+#include <linux/percpu.h>
-+#include <linux/proc_fs.h>
-+#include <linux/seq_file.h>
-+#include <linux/syscalls.h>
-+#include <linux/times.h>
-+#include <linux/tsacct_kern.h>
-+#include <linux/kprobes.h>
-+#include <linux/delayacct.h>
-+#include <linux/log2.h>
-+#include <linux/bootmem.h>
-+#include <linux/ftrace.h>
-+#include <linux/slab.h>
-+#include <linux/init_task.h>
-+#include <linux/binfmts.h>
-+#include <linux/context_tracking.h>
-+
-+#include <asm/switch_to.h>
-+#include <asm/tlb.h>
-+#include <asm/unistd.h>
-+#include <asm/mutex.h>
-+#ifdef CONFIG_PARAVIRT
-+#include <asm/paravirt.h>
-+#endif
-+
-+#include "cpupri.h"
-+#include "../workqueue_internal.h"
-+#include "../smpboot.h"
-+
-+#define CREATE_TRACE_POINTS
-+#include <trace/events/sched.h>
-+
-+#define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO)
-+#define rt_task(p) rt_prio((p)->prio)
-+#define rt_queue(rq) rt_prio((rq)->rq_prio)
-+#define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
-+#define is_rt_policy(policy) ((policy) == SCHED_FIFO || \
-+ (policy) == SCHED_RR)
-+#define has_rt_policy(p) unlikely(is_rt_policy((p)->policy))
-+#define idleprio_task(p) unlikely((p)->policy == SCHED_IDLEPRIO)
-+#define iso_task(p) unlikely((p)->policy == SCHED_ISO)
-+#define iso_queue(rq) unlikely((rq)->rq_policy == SCHED_ISO)
-+#define rq_running_iso(rq) ((rq)->rq_prio == ISO_PRIO)
-+
-+#define ISO_PERIOD ((5 * HZ * grq.noc) + 1)
-+
-+/*
-+ * Convert user-nice values [ -20 ... 0 ... 19 ]
-+ * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
-+ * and back.
-+ */
-+#define NICE_TO_PRIO(nice) (MAX_RT_PRIO + (nice) + 20)
-+#define PRIO_TO_NICE(prio) ((prio) - MAX_RT_PRIO - 20)
-+#define TASK_NICE(p) PRIO_TO_NICE((p)->static_prio)
-+
-+/*
-+ * 'User priority' is the nice value converted to something we
-+ * can work with better when scaling various scheduler parameters,
-+ * it's a [ 0 ... 39 ] range.
-+ */
-+#define USER_PRIO(p) ((p) - MAX_RT_PRIO)
-+#define TASK_USER_PRIO(p) USER_PRIO((p)->static_prio)
-+#define MAX_USER_PRIO (USER_PRIO(MAX_PRIO))
-+#define SCHED_PRIO(p) ((p) + MAX_RT_PRIO)
-+#define STOP_PRIO (MAX_RT_PRIO - 1)
-+
-+/*
-+ * Some helpers for converting to/from various scales. Use shifts to get
-+ * approximate multiples of ten for less overhead.
-+ */
-+#define JIFFIES_TO_NS(TIME) ((TIME) * (1000000000 / HZ))
-+#define JIFFY_NS (1000000000 / HZ)
-+#define HALF_JIFFY_NS (1000000000 / HZ / 2)
-+#define HALF_JIFFY_US (1000000 / HZ / 2)
-+#define MS_TO_NS(TIME) ((TIME) << 20)
-+#define MS_TO_US(TIME) ((TIME) << 10)
-+#define NS_TO_MS(TIME) ((TIME) >> 20)
-+#define NS_TO_US(TIME) ((TIME) >> 10)
-+
-+#define RESCHED_US (100) /* Reschedule if less than this many μs left */
-+
-+void print_scheduler_version(void)
-+{
-+ printk(KERN_INFO "BFS CPU scheduler v0.440 by Con Kolivas.\n");
-+}
-+
-+/*
-+ * This is the time all tasks within the same priority round robin.
-+ * Value is in ms and set to a minimum of 6ms. Scales with number of cpus.
-+ * Tunable via /proc interface.
-+ */
-+int rr_interval __read_mostly = 6;
-+
-+/*
-+ * sched_iso_cpu - sysctl which determines the cpu percentage SCHED_ISO tasks
-+ * are allowed to run five seconds as real time tasks. This is the total over
-+ * all online cpus.
-+ */
-+int sched_iso_cpu __read_mostly = 70;
-+
-+/*
-+ * The relative length of deadline for each priority(nice) level.
-+ */
-+static int prio_ratios[PRIO_RANGE] __read_mostly;
-+
-+/*
-+ * The quota handed out to tasks of all priority levels when refilling their
-+ * time_slice.
-+ */
-+static inline int timeslice(void)
-+{
-+ return MS_TO_US(rr_interval);
-+}
-+
-+/*
-+ * The global runqueue data that all CPUs work off. Data is protected either
-+ * by the global grq lock, or the discrete lock that precedes the data in this
-+ * struct.
-+ */
-+struct global_rq {
-+ raw_spinlock_t lock;
-+ unsigned long nr_running;
-+ unsigned long nr_uninterruptible;
-+ unsigned long long nr_switches;
-+ struct list_head queue[PRIO_LIMIT];
-+ DECLARE_BITMAP(prio_bitmap, PRIO_LIMIT + 1);
-+#ifdef CONFIG_SMP
-+ unsigned long qnr; /* queued not running */
-+ cpumask_t cpu_idle_map;
-+ bool idle_cpus;
-+#endif
-+ int noc; /* num_online_cpus stored and updated when it changes */
-+ u64 niffies; /* Nanosecond jiffies */
-+ unsigned long last_jiffy; /* Last jiffy we updated niffies */
-+
-+ raw_spinlock_t iso_lock;
-+ int iso_ticks;
-+ bool iso_refractory;
-+};
-+
-+#ifdef CONFIG_SMP
-+
-+/*
-+ * We add the notion of a root-domain which will be used to define per-domain
-+ * variables. Each exclusive cpuset essentially defines an island domain by
-+ * fully partitioning the member cpus from any other cpuset. Whenever a new
-+ * exclusive cpuset is created, we also create and attach a new root-domain
-+ * object.
-+ *
-+ */
-+struct root_domain {
-+ atomic_t refcount;
-+ atomic_t rto_count;
-+ struct rcu_head rcu;
-+ cpumask_var_t span;
-+ cpumask_var_t online;
-+
-+ /*
-+ * The "RT overload" flag: it gets set if a CPU has more than
-+ * one runnable RT task.
-+ */
-+ cpumask_var_t rto_mask;
-+ struct cpupri cpupri;
-+};
-+
-+/*
-+ * By default the system creates a single root-domain with all cpus as
-+ * members (mimicking the global state we have today).
-+ */
-+static struct root_domain def_root_domain;
-+
-+#endif /* CONFIG_SMP */
-+
-+/* There can be only one */
-+static struct global_rq grq;
-+
-+/*
-+ * This is the main, per-CPU runqueue data structure.
-+ * This data should only be modified by the local cpu.
-+ */
-+struct rq {
-+ struct task_struct *curr, *idle, *stop;
-+ struct mm_struct *prev_mm;
-+
-+ /* Stored data about rq->curr to work outside grq lock */
-+ u64 rq_deadline;
-+ unsigned int rq_policy;
-+ int rq_time_slice;
-+ u64 rq_last_ran;
-+ int rq_prio;
-+ bool rq_running; /* There is a task running */
-+
-+ /* Accurate timekeeping data */
-+ u64 timekeep_clock;
-+ unsigned long user_pc, nice_pc, irq_pc, softirq_pc, system_pc,
-+ iowait_pc, idle_pc;
-+ atomic_t nr_iowait;
-+
-+#ifdef CONFIG_SMP
-+ int cpu; /* cpu of this runqueue */
-+ bool online;
-+ bool scaling; /* This CPU is managed by a scaling CPU freq governor */
-+ struct task_struct *sticky_task;
-+
-+ struct root_domain *rd;
-+ struct sched_domain *sd;
-+ int *cpu_locality; /* CPU relative cache distance */
-+#ifdef CONFIG_SCHED_SMT
-+ bool (*siblings_idle)(int cpu);
-+ /* See if all smt siblings are idle */
-+ cpumask_t smt_siblings;
-+#endif /* CONFIG_SCHED_SMT */
-+#ifdef CONFIG_SCHED_MC
-+ bool (*cache_idle)(int cpu);
-+ /* See if all cache siblings are idle */
-+ cpumask_t cache_siblings;
-+#endif /* CONFIG_SCHED_MC */
-+ u64 last_niffy; /* Last time this RQ updated grq.niffies */
-+#endif /* CONFIG_SMP */
-+#ifdef CONFIG_IRQ_TIME_ACCOUNTING
-+ u64 prev_irq_time;
-+#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
-+#ifdef CONFIG_PARAVIRT
-+ u64 prev_steal_time;
-+#endif /* CONFIG_PARAVIRT */
-+#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
-+ u64 prev_steal_time_rq;
-+#endif /* CONFIG_PARAVIRT_TIME_ACCOUNTING */
-+
-+ u64 clock, old_clock, last_tick;
-+ u64 clock_task;
-+ bool dither;
-+
-+#ifdef CONFIG_SCHEDSTATS
-+
-+ /* latency stats */
-+ struct sched_info rq_sched_info;
-+ unsigned long long rq_cpu_time;
-+ /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
-+
-+ /* sys_sched_yield() stats */
-+ unsigned int yld_count;
-+
-+ /* schedule() stats */
-+ unsigned int sched_switch;
-+ unsigned int sched_count;
-+ unsigned int sched_goidle;
-+
-+ /* try_to_wake_up() stats */
-+ unsigned int ttwu_count;
-+ unsigned int ttwu_local;
-+#endif /* CONFIG_SCHEDSTATS */
-+};
-+
-+DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
-+static DEFINE_MUTEX(sched_hotcpu_mutex);
-+
-+#ifdef CONFIG_SMP
-+#define cpu_rq(cpu) (&per_cpu(runqueues, (cpu)))
-+#define this_rq() (&__get_cpu_var(runqueues))
-+#define task_rq(p) cpu_rq(task_cpu(p))
-+#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
-+/*
-+ * sched_domains_mutex serialises calls to init_sched_domains,
-+ * detach_destroy_domains and partition_sched_domains.
-+ */
-+static DEFINE_MUTEX(sched_domains_mutex);
-+
-+/*
-+ * By default the system creates a single root-domain with all cpus as
-+ * members (mimicking the global state we have today).
-+ */
-+static struct root_domain def_root_domain;
-+
-+int __weak arch_sd_sibling_asym_packing(void)
-+{
-+ return 0*SD_ASYM_PACKING;
-+}
-+#endif /* CONFIG_SMP */
-+
-+#define rcu_dereference_check_sched_domain(p) \
-+ rcu_dereference_check((p), \
-+ lockdep_is_held(&sched_domains_mutex))
-+
-+/*
-+ * The domain tree (rq->sd) is protected by RCU's quiescent state transition.
-+ * See detach_destroy_domains: synchronize_sched for details.
-+ *
-+ * The domain tree of any CPU may only be accessed from within
-+ * preempt-disabled sections.
-+ */
-+#define for_each_domain(cpu, __sd) \
-+ for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); __sd; __sd = __sd->parent)
-+
-+static inline void update_rq_clock(struct rq *rq);
-+
-+/*
-+ * Sanity check should sched_clock return bogus values. We make sure it does
-+ * not appear to go backwards, and use jiffies to determine the maximum and
-+ * minimum it could possibly have increased, and round down to the nearest
-+ * jiffy when it falls outside this.
-+ */
-+static inline void niffy_diff(s64 *niff_diff, int jiff_diff)
-+{
-+ unsigned long min_diff, max_diff;
-+
-+ if (jiff_diff > 1)
-+ min_diff = JIFFIES_TO_NS(jiff_diff - 1);
-+ else
-+ min_diff = 1;
-+ /* Round up to the nearest tick for maximum */
-+ max_diff = JIFFIES_TO_NS(jiff_diff + 1);
-+
-+ if (unlikely(*niff_diff < min_diff || *niff_diff > max_diff))
-+ *niff_diff = min_diff;
-+}
-+
-+#ifdef CONFIG_SMP
-+static inline int cpu_of(struct rq *rq)
-+{
-+ return rq->cpu;
-+}
-+
-+/*
-+ * Niffies are a globally increasing nanosecond counter. Whenever a runqueue
-+ * clock is updated with the grq.lock held, it is an opportunity to update the
-+ * niffies value. Any CPU can update it by adding how much its clock has
-+ * increased since it last updated niffies, minus any added niffies by other
-+ * CPUs.
-+ */
-+static inline void update_clocks(struct rq *rq)
-+{
-+ s64 ndiff;
-+ long jdiff;
-+
-+ update_rq_clock(rq);
-+ ndiff = rq->clock - rq->old_clock;
-+ /* old_clock is only updated when we are updating niffies */
-+ rq->old_clock = rq->clock;
-+ ndiff -= grq.niffies - rq->last_niffy;
-+ jdiff = jiffies - grq.last_jiffy;
-+ niffy_diff(&ndiff, jdiff);
-+ grq.last_jiffy += jdiff;
-+ grq.niffies += ndiff;
-+ rq->last_niffy = grq.niffies;
-+}
-+#else /* CONFIG_SMP */
-+static struct rq *uprq;
-+#define cpu_rq(cpu) (uprq)
-+#define this_rq() (uprq)
-+#define task_rq(p) (uprq)
-+#define cpu_curr(cpu) ((uprq)->curr)
-+static inline int cpu_of(struct rq *rq)
-+{
-+ return 0;
-+}
-+
-+static inline void update_clocks(struct rq *rq)
-+{
-+ s64 ndiff;
-+ long jdiff;
-+
-+ update_rq_clock(rq);
-+ ndiff = rq->clock - rq->old_clock;
-+ rq->old_clock = rq->clock;
-+ jdiff = jiffies - grq.last_jiffy;
-+ niffy_diff(&ndiff, jdiff);
-+ grq.last_jiffy += jdiff;
-+ grq.niffies += ndiff;
-+}
-+#endif
-+#define raw_rq() (&__raw_get_cpu_var(runqueues))
-+
-+#include "stats.h"
-+
-+#ifndef prepare_arch_switch
-+# define prepare_arch_switch(next) do { } while (0)
-+#endif
-+#ifndef finish_arch_switch
-+# define finish_arch_switch(prev) do { } while (0)
-+#endif
-+#ifndef finish_arch_post_lock_switch
-+# define finish_arch_post_lock_switch() do { } while (0)
-+#endif
-+
-+/*
-+ * All common locking functions performed on grq.lock. rq->clock is local to
-+ * the CPU accessing it so it can be modified just with interrupts disabled
-+ * when we're not updating niffies.
-+ * Looking up task_rq must be done under grq.lock to be safe.
-+ */
-+static void update_rq_clock_task(struct rq *rq, s64 delta);
-+
-+static inline void update_rq_clock(struct rq *rq)
-+{
-+ s64 delta = sched_clock_cpu(cpu_of(rq)) - rq->clock;
-+
-+ rq->clock += delta;
-+ update_rq_clock_task(rq, delta);
-+}
-+
-+static inline bool task_running(struct task_struct *p)
-+{
-+ return p->on_cpu;
-+}
-+
-+static inline void grq_lock(void)
-+ __acquires(grq.lock)
-+{
-+ raw_spin_lock(&grq.lock);
-+}
-+
-+static inline void grq_unlock(void)
-+ __releases(grq.lock)
-+{
-+ raw_spin_unlock(&grq.lock);
-+}
-+
-+static inline void grq_lock_irq(void)
-+ __acquires(grq.lock)
-+{
-+ raw_spin_lock_irq(&grq.lock);
-+}
-+
-+static inline void time_lock_grq(struct rq *rq)
-+ __acquires(grq.lock)
-+{
-+ grq_lock();
-+ update_clocks(rq);
-+}
-+
-+static inline void grq_unlock_irq(void)
-+ __releases(grq.lock)
-+{
-+ raw_spin_unlock_irq(&grq.lock);
-+}
-+
-+static inline void grq_lock_irqsave(unsigned long *flags)
-+ __acquires(grq.lock)
-+{
-+ raw_spin_lock_irqsave(&grq.lock, *flags);
-+}
-+
-+static inline void grq_unlock_irqrestore(unsigned long *flags)
-+ __releases(grq.lock)
-+{
-+ raw_spin_unlock_irqrestore(&grq.lock, *flags);
-+}
-+
-+static inline struct rq
-+*task_grq_lock(struct task_struct *p, unsigned long *flags)
-+ __acquires(grq.lock)
-+{
-+ grq_lock_irqsave(flags);
-+ return task_rq(p);
-+}
-+
-+static inline struct rq
-+*time_task_grq_lock(struct task_struct *p, unsigned long *flags)
-+ __acquires(grq.lock)
-+{
-+ struct rq *rq = task_grq_lock(p, flags);
-+ update_clocks(rq);
-+ return rq;
-+}
-+
-+static inline struct rq *task_grq_lock_irq(struct task_struct *p)
-+ __acquires(grq.lock)
-+{
-+ grq_lock_irq();
-+ return task_rq(p);
-+}
-+
-+static inline void time_task_grq_lock_irq(struct task_struct *p)
-+ __acquires(grq.lock)
-+{
-+ struct rq *rq = task_grq_lock_irq(p);
-+ update_clocks(rq);
-+}
-+
-+static inline void task_grq_unlock_irq(void)
-+ __releases(grq.lock)
-+{
-+ grq_unlock_irq();
-+}
-+
-+static inline void task_grq_unlock(unsigned long *flags)
-+ __releases(grq.lock)
-+{
-+ grq_unlock_irqrestore(flags);
-+}
-+
-+/**
-+ * grunqueue_is_locked
-+ *
-+ * Returns true if the global runqueue is locked.
-+ * This interface allows printk to be called with the runqueue lock
-+ * held and know whether or not it is OK to wake up the klogd.
-+ */
-+bool grunqueue_is_locked(void)
-+{
-+ return raw_spin_is_locked(&grq.lock);
-+}
-+
-+void grq_unlock_wait(void)
-+ __releases(grq.lock)
-+{
-+ smp_mb(); /* spin-unlock-wait is not a full memory barrier */
-+ raw_spin_unlock_wait(&grq.lock);
-+}
-+
-+static inline void time_grq_lock(struct rq *rq, unsigned long *flags)
-+ __acquires(grq.lock)
-+{
-+ local_irq_save(*flags);
-+ time_lock_grq(rq);
-+}
-+
-+static inline struct rq *__task_grq_lock(struct task_struct *p)
-+ __acquires(grq.lock)
-+{
-+ grq_lock();
-+ return task_rq(p);
-+}
-+
-+static inline void __task_grq_unlock(void)
-+ __releases(grq.lock)
-+{
-+ grq_unlock();
-+}
-+
-+/*
-+ * Look for any tasks *anywhere* that are running nice 0 or better. We do
-+ * this lockless for overhead reasons since the occasional wrong result
-+ * is harmless.
-+ */
-+bool above_background_load(void)
-+{
-+ int cpu;
-+
-+ for_each_online_cpu(cpu) {
-+ struct task_struct *cpu_curr = cpu_rq(cpu)->curr;
-+
-+ if (unlikely(!cpu_curr))
-+ continue;
-+ if (PRIO_TO_NICE(cpu_curr->static_prio) < 1) {
-+ return true;
-+ }
-+ }
-+ return false;
-+}
-+
-+#ifndef __ARCH_WANT_UNLOCKED_CTXSW
-+static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
-+{
-+}
-+
-+static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
-+{
-+#ifdef CONFIG_DEBUG_SPINLOCK
-+ /* this is a valid case when another task releases the spinlock */
-+ grq.lock.owner = current;
-+#endif
-+ /*
-+ * If we are tracking spinlock dependencies then we have to
-+ * fix up the runqueue lock - which gets 'carried over' from
-+ * prev into current:
-+ */
-+ spin_acquire(&grq.lock.dep_map, 0, 0, _THIS_IP_);
-+
-+ grq_unlock_irq();
-+}
-+
-+#else /* __ARCH_WANT_UNLOCKED_CTXSW */
-+
-+static inline void prepare_lock_switch(struct rq *rq, struct task_struct *next)
-+{
-+#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
-+ grq_unlock_irq();
-+#else
-+ grq_unlock();
-+#endif
-+}
-+
-+static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
-+{
-+ smp_wmb();
-+#ifndef __ARCH_WANT_INTERRUPTS_ON_CTXSW
-+ local_irq_enable();
-+#endif
-+}
-+#endif /* __ARCH_WANT_UNLOCKED_CTXSW */
-+
-+static inline bool deadline_before(u64 deadline, u64 time)
-+{
-+ return (deadline < time);
-+}
-+
-+static inline bool deadline_after(u64 deadline, u64 time)
-+{
-+ return (deadline > time);
-+}
-+
-+/*
-+ * A task that is queued but not running will be on the grq run list.
-+ * A task that is not running or queued will not be on the grq run list.
-+ * A task that is currently running will have ->on_cpu set but not on the
-+ * grq run list.
-+ */
-+static inline bool task_queued(struct task_struct *p)
-+{
-+ return (!list_empty(&p->run_list));
-+}
-+
-+/*
-+ * Removing from the global runqueue. Enter with grq locked.
-+ */
-+static void dequeue_task(struct task_struct *p)
-+{
-+ list_del_init(&p->run_list);
-+ if (list_empty(grq.queue + p->prio))
-+ __clear_bit(p->prio, grq.prio_bitmap);
-+}
-+
-+/*
-+ * To determine if it's safe for a task of SCHED_IDLEPRIO to actually run as
-+ * an idle task, we ensure none of the following conditions are met.
-+ */
-+static bool idleprio_suitable(struct task_struct *p)
-+{
-+ return (!freezing(p) && !signal_pending(p) &&
-+ !(task_contributes_to_load(p)) && !(p->flags & (PF_EXITING)));
-+}
-+
-+/*
-+ * To determine if a task of SCHED_ISO can run in pseudo-realtime, we check
-+ * that the iso_refractory flag is not set.
-+ */
-+static bool isoprio_suitable(void)
-+{
-+ return !grq.iso_refractory;
-+}
-+
-+/*
-+ * Adding to the global runqueue. Enter with grq locked.
-+ */
-+static void enqueue_task(struct task_struct *p)
-+{
-+ if (!rt_task(p)) {
-+ /* Check it hasn't gotten rt from PI */
-+ if ((idleprio_task(p) && idleprio_suitable(p)) ||
-+ (iso_task(p) && isoprio_suitable()))
-+ p->prio = p->normal_prio;
-+ else
-+ p->prio = NORMAL_PRIO;
-+ }
-+ __set_bit(p->prio, grq.prio_bitmap);
-+ list_add_tail(&p->run_list, grq.queue + p->prio);
-+ sched_info_queued(p);
-+}
-+
-+/* Only idle task does this as a real time task*/
-+static inline void enqueue_task_head(struct task_struct *p)
-+{
-+ __set_bit(p->prio, grq.prio_bitmap);
-+ list_add(&p->run_list, grq.queue + p->prio);
-+ sched_info_queued(p);
-+}
-+
-+static inline void requeue_task(struct task_struct *p)
-+{
-+ sched_info_queued(p);
-+}
-+
-+/*
-+ * Returns the relative length of deadline all compared to the shortest
-+ * deadline which is that of nice -20.
-+ */
-+static inline int task_prio_ratio(struct task_struct *p)
-+{
-+ return prio_ratios[TASK_USER_PRIO(p)];
-+}
-+
-+/*
-+ * task_timeslice - all tasks of all priorities get the exact same timeslice
-+ * length. CPU distribution is handled by giving different deadlines to
-+ * tasks of different priorities. Use 128 as the base value for fast shifts.
-+ */
-+static inline int task_timeslice(struct task_struct *p)
-+{
-+ return (rr_interval * task_prio_ratio(p) / 128);
-+}
-+
-+#ifdef CONFIG_SMP
-+/*
-+ * qnr is the "queued but not running" count which is the total number of
-+ * tasks on the global runqueue list waiting for cpu time but not actually
-+ * currently running on a cpu.
-+ */
-+static inline void inc_qnr(void)
-+{
-+ grq.qnr++;
-+}
-+
-+static inline void dec_qnr(void)
-+{
-+ grq.qnr--;
-+}
-+
-+static inline int queued_notrunning(void)
-+{
-+ return grq.qnr;
-+}
-+
-+/*
-+ * The cpu_idle_map stores a bitmap of all the CPUs currently idle to
-+ * allow easy lookup of whether any suitable idle CPUs are available.
-+ * It's cheaper to maintain a binary yes/no if there are any idle CPUs on the
-+ * idle_cpus variable than to do a full bitmask check when we are busy.
-+ */
-+static inline void set_cpuidle_map(int cpu)
-+{
-+ if (likely(cpu_online(cpu))) {
-+ cpu_set(cpu, grq.cpu_idle_map);
-+ grq.idle_cpus = true;
-+ }
-+}
-+
-+static inline void clear_cpuidle_map(int cpu)
-+{
-+ cpu_clear(cpu, grq.cpu_idle_map);
-+ if (cpus_empty(grq.cpu_idle_map))
-+ grq.idle_cpus = false;
-+}
-+
-+static bool suitable_idle_cpus(struct task_struct *p)
-+{
-+ if (!grq.idle_cpus)
-+ return false;
-+ return (cpus_intersects(p->cpus_allowed, grq.cpu_idle_map));
-+}
-+
-+#define CPUIDLE_DIFF_THREAD (1)
-+#define CPUIDLE_DIFF_CORE (2)
-+#define CPUIDLE_CACHE_BUSY (4)
-+#define CPUIDLE_DIFF_CPU (8)
-+#define CPUIDLE_THREAD_BUSY (16)
-+#define CPUIDLE_DIFF_NODE (32)
-+
-+static void resched_task(struct task_struct *p);
-+
-+/*
-+ * The best idle CPU is chosen according to the CPUIDLE ranking above where the
-+ * lowest value would give the most suitable CPU to schedule p onto next. The
-+ * order works out to be the following:
-+ *
-+ * Same core, idle or busy cache, idle or busy threads
-+ * Other core, same cache, idle or busy cache, idle threads.
-+ * Same node, other CPU, idle cache, idle threads.
-+ * Same node, other CPU, busy cache, idle threads.
-+ * Other core, same cache, busy threads.
-+ * Same node, other CPU, busy threads.
-+ * Other node, other CPU, idle cache, idle threads.
-+ * Other node, other CPU, busy cache, idle threads.
-+ * Other node, other CPU, busy threads.
-+ */
-+static void
-+resched_best_mask(int best_cpu, struct rq *rq, cpumask_t *tmpmask)
-+{
-+ unsigned int best_ranking = CPUIDLE_DIFF_NODE | CPUIDLE_THREAD_BUSY |
-+ CPUIDLE_DIFF_CPU | CPUIDLE_CACHE_BUSY | CPUIDLE_DIFF_CORE |
-+ CPUIDLE_DIFF_THREAD;
-+ int cpu_tmp;
-+
-+ if (cpu_isset(best_cpu, *tmpmask))
-+ goto out;
-+
-+ for_each_cpu_mask(cpu_tmp, *tmpmask) {
-+ unsigned int ranking;
-+ struct rq *tmp_rq;
-+
-+ ranking = 0;
-+ tmp_rq = cpu_rq(cpu_tmp);
-+
-+#ifdef CONFIG_NUMA
-+ if (rq->cpu_locality[cpu_tmp] > 3)
-+ ranking |= CPUIDLE_DIFF_NODE;
-+ else
-+#endif
-+ if (rq->cpu_locality[cpu_tmp] > 2)
-+ ranking |= CPUIDLE_DIFF_CPU;
-+#ifdef CONFIG_SCHED_MC
-+ if (rq->cpu_locality[cpu_tmp] == 2)
-+ ranking |= CPUIDLE_DIFF_CORE;
-+ if (!(tmp_rq->cache_idle(cpu_tmp)))
-+ ranking |= CPUIDLE_CACHE_BUSY;
-+#endif
-+#ifdef CONFIG_SCHED_SMT
-+ if (rq->cpu_locality[cpu_tmp] == 1)
-+ ranking |= CPUIDLE_DIFF_THREAD;
-+ if (!(tmp_rq->siblings_idle(cpu_tmp)))
-+ ranking |= CPUIDLE_THREAD_BUSY;
-+#endif
-+ if (ranking < best_ranking) {
-+ best_cpu = cpu_tmp;
-+ best_ranking = ranking;
-+ }
-+ }
-+out:
-+ resched_task(cpu_rq(best_cpu)->curr);
-+}
-+
-+bool cpus_share_cache(int this_cpu, int that_cpu)
-+{
-+ struct rq *this_rq = cpu_rq(this_cpu);
-+
-+ return (this_rq->cpu_locality[that_cpu] < 3);
-+}
-+
-+static void resched_best_idle(struct task_struct *p)
-+{
-+ cpumask_t tmpmask;
-+
-+ cpus_and(tmpmask, p->cpus_allowed, grq.cpu_idle_map);
-+ resched_best_mask(task_cpu(p), task_rq(p), &tmpmask);
-+}
-+
-+static inline void resched_suitable_idle(struct task_struct *p)
-+{
-+ if (suitable_idle_cpus(p))
-+ resched_best_idle(p);
-+}
-+/*
-+ * Flags to tell us whether this CPU is running a CPU frequency governor that
-+ * has slowed its speed or not. No locking required as the very rare wrongly
-+ * read value would be harmless.
-+ */
-+void cpu_scaling(int cpu)
-+{
-+ cpu_rq(cpu)->scaling = true;
-+}
-+
-+void cpu_nonscaling(int cpu)
-+{
-+ cpu_rq(cpu)->scaling = false;
-+}
-+
-+static inline bool scaling_rq(struct rq *rq)
-+{
-+ return rq->scaling;
-+}
-+
-+static inline int locality_diff(struct task_struct *p, struct rq *rq)
-+{
-+ return rq->cpu_locality[task_cpu(p)];
-+}
-+#else /* CONFIG_SMP */
-+static inline void inc_qnr(void)
-+{
-+}
-+
-+static inline void dec_qnr(void)
-+{
-+}
-+
-+static inline int queued_notrunning(void)
-+{
-+ return grq.nr_running;
-+}
-+
-+static inline void set_cpuidle_map(int cpu)
-+{
-+}
-+
-+static inline void clear_cpuidle_map(int cpu)
-+{
-+}
-+
-+static inline bool suitable_idle_cpus(struct task_struct *p)
-+{
-+ return uprq->curr == uprq->idle;
-+}
-+
-+static inline void resched_suitable_idle(struct task_struct *p)
-+{
-+}
-+
-+void cpu_scaling(int __unused)
-+{
-+}
-+
-+void cpu_nonscaling(int __unused)
-+{
-+}
-+
-+/*
-+ * Although CPUs can scale in UP, there is nowhere else for tasks to go so this
-+ * always returns 0.
-+ */
-+static inline bool scaling_rq(struct rq *rq)
-+{
-+ return false;
-+}
-+
-+static inline int locality_diff(struct task_struct *p, struct rq *rq)
-+{
-+ return 0;
-+}
-+#endif /* CONFIG_SMP */
-+EXPORT_SYMBOL_GPL(cpu_scaling);
-+EXPORT_SYMBOL_GPL(cpu_nonscaling);
-+
-+/*
-+ * activate_idle_task - move idle task to the _front_ of runqueue.
-+ */
-+static inline void activate_idle_task(struct task_struct *p)
-+{
-+ enqueue_task_head(p);
-+ grq.nr_running++;
-+ inc_qnr();
-+}
-+
-+static inline int normal_prio(struct task_struct *p)
-+{
-+ if (has_rt_policy(p))
-+ return MAX_RT_PRIO - 1 - p->rt_priority;
-+ if (idleprio_task(p))
-+ return IDLE_PRIO;
-+ if (iso_task(p))
-+ return ISO_PRIO;
-+ return NORMAL_PRIO;
-+}
-+
-+/*
-+ * Calculate the current priority, i.e. the priority
-+ * taken into account by the scheduler. This value might
-+ * be boosted by RT tasks as it will be RT if the task got
-+ * RT-boosted. If not then it returns p->normal_prio.
-+ */
-+static int effective_prio(struct task_struct *p)
-+{
-+ p->normal_prio = normal_prio(p);
-+ /*
-+ * If we are RT tasks or we were boosted to RT priority,
-+ * keep the priority unchanged. Otherwise, update priority
-+ * to the normal priority:
-+ */
-+ if (!rt_prio(p->prio))
-+ return p->normal_prio;
-+ return p->prio;
-+}
-+
-+/*
-+ * activate_task - move a task to the runqueue. Enter with grq locked.
-+ */
-+static void activate_task(struct task_struct *p, struct rq *rq)
-+{
-+ update_clocks(rq);
-+
-+ /*
-+ * Sleep time is in units of nanosecs, so shift by 20 to get a
-+ * milliseconds-range estimation of the amount of time that the task
-+ * spent sleeping:
-+ */
-+ if (unlikely(prof_on == SLEEP_PROFILING)) {
-+ if (p->state == TASK_UNINTERRUPTIBLE)
-+ profile_hits(SLEEP_PROFILING, (void *)get_wchan(p),
-+ (rq->clock_task - p->last_ran) >> 20);
-+ }
-+
-+ p->prio = effective_prio(p);
-+ if (task_contributes_to_load(p))
-+ grq.nr_uninterruptible--;
-+ enqueue_task(p);
-+ grq.nr_running++;
-+ inc_qnr();
-+}
-+
-+static inline void clear_sticky(struct task_struct *p);
-+
-+/*
-+ * deactivate_task - If it's running, it's not on the grq and we can just
-+ * decrement the nr_running. Enter with grq locked.
-+ */
-+static inline void deactivate_task(struct task_struct *p)
-+{
-+ if (task_contributes_to_load(p))
-+ grq.nr_uninterruptible++;
-+ grq.nr_running--;
-+ clear_sticky(p);
-+}
-+
-+static ATOMIC_NOTIFIER_HEAD(task_migration_notifier);
-+
-+void register_task_migration_notifier(struct notifier_block *n)
-+{
-+ atomic_notifier_chain_register(&task_migration_notifier, n);
-+}
-+
-+#ifdef CONFIG_SMP
-+void set_task_cpu(struct task_struct *p, unsigned int cpu)
-+{
-+#ifdef CONFIG_LOCKDEP
-+ /*
-+ * The caller should hold grq lock.
-+ */
-+ WARN_ON_ONCE(debug_locks && !lockdep_is_held(&grq.lock));
-+#endif
-+ trace_sched_migrate_task(p, cpu);
-+ if (task_cpu(p) != cpu)
-+ perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, NULL, 0);
-+
-+ /*
-+ * After ->cpu is set up to a new value, task_grq_lock(p, ...) can be
-+ * successfully executed on another CPU. We must ensure that updates of
-+ * per-task data have been completed by this moment.
-+ */
-+ smp_wmb();
-+ task_thread_info(p)->cpu = cpu;
-+}
-+
-+static inline void clear_sticky(struct task_struct *p)
-+{
-+ p->sticky = false;
-+}
-+
-+static inline bool task_sticky(struct task_struct *p)
-+{
-+ return p->sticky;
-+}
-+
-+/* Reschedule the best idle CPU that is not this one. */
-+static void
-+resched_closest_idle(struct rq *rq, int cpu, struct task_struct *p)
-+{
-+ cpumask_t tmpmask;
-+
-+ cpus_and(tmpmask, p->cpus_allowed, grq.cpu_idle_map);
-+ cpu_clear(cpu, tmpmask);
-+ if (cpus_empty(tmpmask))
-+ return;
-+ resched_best_mask(cpu, rq, &tmpmask);
-+}
-+
-+/*
-+ * We set the sticky flag on a task that is descheduled involuntarily meaning
-+ * it is awaiting further CPU time. If the last sticky task is still sticky
-+ * but unlucky enough to not be the next task scheduled, we unstick it and try
-+ * to find it an idle CPU. Realtime tasks do not stick to minimise their
-+ * latency at all times.
-+ */
-+static inline void
-+swap_sticky(struct rq *rq, int cpu, struct task_struct *p)
-+{
-+ if (rq->sticky_task) {
-+ if (rq->sticky_task == p) {
-+ p->sticky = true;
-+ return;
-+ }
-+ if (task_sticky(rq->sticky_task)) {
-+ clear_sticky(rq->sticky_task);
-+ resched_closest_idle(rq, cpu, rq->sticky_task);
-+ }
-+ }
-+ if (!rt_task(p)) {
-+ p->sticky = true;
-+ rq->sticky_task = p;
-+ } else {
-+ resched_closest_idle(rq, cpu, p);
-+ rq->sticky_task = NULL;
-+ }
-+}
-+
-+static inline void unstick_task(struct rq *rq, struct task_struct *p)
-+{
-+ rq->sticky_task = NULL;
-+ clear_sticky(p);
-+}
-+#else
-+static inline void clear_sticky(struct task_struct *p)
-+{
-+}
-+
-+static inline bool task_sticky(struct task_struct *p)
-+{
-+ return false;
-+}
-+
-+static inline void
-+swap_sticky(struct rq *rq, int cpu, struct task_struct *p)
-+{
-+}
-+
-+static inline void unstick_task(struct rq *rq, struct task_struct *p)
-+{
-+}
-+#endif
-+
-+/*
-+ * Move a task off the global queue and take it to a cpu for it will
-+ * become the running task.
-+ */
-+static inline void take_task(int cpu, struct task_struct *p)
-+{
-+ set_task_cpu(p, cpu);
-+ dequeue_task(p);
-+ clear_sticky(p);
-+ dec_qnr();
-+}
-+
-+/*
-+ * Returns a descheduling task to the grq runqueue unless it is being
-+ * deactivated.
-+ */
-+static inline void return_task(struct task_struct *p, bool deactivate)
-+{
-+ if (deactivate)
-+ deactivate_task(p);
-+ else {
-+ inc_qnr();
-+ enqueue_task(p);
-+ }
-+}
-+
-+/*
-+ * resched_task - mark a task 'to be rescheduled now'.
-+ *
-+ * On UP this means the setting of the need_resched flag, on SMP it
-+ * might also involve a cross-CPU call to trigger the scheduler on
-+ * the target CPU.
-+ */
-+#ifdef CONFIG_SMP
-+
-+#ifndef tsk_is_polling
-+#define tsk_is_polling(t) 0
-+#endif
-+
-+static void resched_task(struct task_struct *p)
-+{
-+ int cpu;
-+
-+ assert_raw_spin_locked(&grq.lock);
-+
-+ if (unlikely(test_tsk_thread_flag(p, TIF_NEED_RESCHED)))
-+ return;
-+
-+ set_tsk_thread_flag(p, TIF_NEED_RESCHED);
-+
-+ cpu = task_cpu(p);
-+ if (cpu == smp_processor_id())
-+ return;
-+
-+ /* NEED_RESCHED must be visible before we test polling */
-+ smp_mb();
-+ if (!tsk_is_polling(p))
-+ smp_send_reschedule(cpu);
-+}
-+
-+#else
-+static inline void resched_task(struct task_struct *p)
-+{
-+ assert_raw_spin_locked(&grq.lock);
-+ set_tsk_need_resched(p);
-+}
-+#endif
-+
-+/**
-+ * task_curr - is this task currently executing on a CPU?
-+ * @p: the task in question.
-+ */
-+inline int task_curr(const struct task_struct *p)
-+{
-+ return cpu_curr(task_cpu(p)) == p;
-+}
-+
-+#ifdef CONFIG_SMP
-+struct migration_req {
-+ struct task_struct *task;
-+ int dest_cpu;
-+};
-+
-+/*
-+ * wait_task_inactive - wait for a thread to unschedule.
-+ *
-+ * If @match_state is nonzero, it's the @p->state value just checked and
-+ * not expected to change. If it changes, i.e. @p might have woken up,
-+ * then return zero. When we succeed in waiting for @p to be off its CPU,
-+ * we return a positive number (its total switch count). If a second call
-+ * a short while later returns the same number, the caller can be sure that
-+ * @p has remained unscheduled the whole time.
-+ *
-+ * The caller must ensure that the task *will* unschedule sometime soon,
-+ * else this function might spin for a *long* time. This function can't
-+ * be called with interrupts off, or it may introduce deadlock with
-+ * smp_call_function() if an IPI is sent by the same process we are
-+ * waiting to become inactive.
-+ */
-+unsigned long wait_task_inactive(struct task_struct *p, long match_state)
-+{
-+ unsigned long flags;
-+ bool running, on_rq;
-+ unsigned long ncsw;
-+ struct rq *rq;
-+
-+ for (;;) {
-+ /*
-+ * We do the initial early heuristics without holding
-+ * any task-queue locks at all. We'll only try to get
-+ * the runqueue lock when things look like they will
-+ * work out! In the unlikely event rq is dereferenced
-+ * since we're lockless, grab it again.
-+ */
-+#ifdef CONFIG_SMP
-+retry_rq:
-+ rq = task_rq(p);
-+ if (unlikely(!rq))
-+ goto retry_rq;
-+#else /* CONFIG_SMP */
-+ rq = task_rq(p);
-+#endif
-+ /*
-+ * If the task is actively running on another CPU
-+ * still, just relax and busy-wait without holding
-+ * any locks.
-+ *
-+ * NOTE! Since we don't hold any locks, it's not
-+ * even sure that "rq" stays as the right runqueue!
-+ * But we don't care, since this will return false
-+ * if the runqueue has changed and p is actually now
-+ * running somewhere else!
-+ */
-+ while (task_running(p) && p == rq->curr) {
-+ if (match_state && unlikely(p->state != match_state))
-+ return 0;
-+ cpu_relax();
-+ }
-+
-+ /*
-+ * Ok, time to look more closely! We need the grq
-+ * lock now, to be *sure*. If we're wrong, we'll
-+ * just go back and repeat.
-+ */
-+ rq = task_grq_lock(p, &flags);
-+ trace_sched_wait_task(p);
-+ running = task_running(p);
-+ on_rq = task_queued(p);
-+ ncsw = 0;
-+ if (!match_state || p->state == match_state)
-+ ncsw = p->nvcsw | LONG_MIN; /* sets MSB */
-+ task_grq_unlock(&flags);
-+
-+ /*
-+ * If it changed from the expected state, bail out now.
-+ */
-+ if (unlikely(!ncsw))
-+ break;
-+
-+ /*
-+ * Was it really running after all now that we
-+ * checked with the proper locks actually held?
-+ *
-+ * Oops. Go back and try again..
-+ */
-+ if (unlikely(running)) {
-+ cpu_relax();
-+ continue;
-+ }
-+
-+ /*
-+ * It's not enough that it's not actively running,
-+ * it must be off the runqueue _entirely_, and not
-+ * preempted!
-+ *
-+ * So if it was still runnable (but just not actively
-+ * running right now), it's preempted, and we should
-+ * yield - it could be a while.
-+ */
-+ if (unlikely(on_rq)) {
-+ ktime_t to = ktime_set(0, NSEC_PER_SEC / HZ);
-+
-+ set_current_state(TASK_UNINTERRUPTIBLE);
-+ schedule_hrtimeout(&to, HRTIMER_MODE_REL);
-+ continue;
-+ }
-+
-+ /*
-+ * Ahh, all good. It wasn't running, and it wasn't
-+ * runnable, which means that it will never become
-+ * running in the future either. We're all done!
-+ */
-+ break;
-+ }
-+
-+ return ncsw;
-+}
-+
-+/***
-+ * kick_process - kick a running thread to enter/exit the kernel
-+ * @p: the to-be-kicked thread
-+ *
-+ * Cause a process which is running on another CPU to enter
-+ * kernel-mode, without any delay. (to get signals handled.)
-+ *
-+ * NOTE: this function doesn't have to take the runqueue lock,
-+ * because all it wants to ensure is that the remote task enters
-+ * the kernel. If the IPI races and the task has been migrated
-+ * to another CPU then no harm is done and the purpose has been
-+ * achieved as well.
-+ */
-+void kick_process(struct task_struct *p)
-+{
-+ int cpu;
-+
-+ preempt_disable();
-+ cpu = task_cpu(p);
-+ if ((cpu != smp_processor_id()) && task_curr(p))
-+ smp_send_reschedule(cpu);
-+ preempt_enable();
-+}
-+EXPORT_SYMBOL_GPL(kick_process);
-+#endif
-+
-+#define rq_idle(rq) ((rq)->rq_prio == PRIO_LIMIT)
-+
-+/*
-+ * RT tasks preempt purely on priority. SCHED_NORMAL tasks preempt on the
-+ * basis of earlier deadlines. SCHED_IDLEPRIO don't preempt anything else or
-+ * between themselves, they cooperatively multitask. An idle rq scores as
-+ * prio PRIO_LIMIT so it is always preempted.
-+ */
-+static inline bool
-+can_preempt(struct task_struct *p, int prio, u64 deadline)
-+{
-+ /* Better static priority RT task or better policy preemption */
-+ if (p->prio < prio)
-+ return true;
-+ if (p->prio > prio)
-+ return false;
-+ /* SCHED_NORMAL, BATCH and ISO will preempt based on deadline */
-+ if (!deadline_before(p->deadline, deadline))
-+ return false;
-+ return true;
-+}
-+
-+#ifdef CONFIG_SMP
-+#define cpu_online_map (*(cpumask_t *)cpu_online_mask)
-+#ifdef CONFIG_HOTPLUG_CPU
-+/*
-+ * Check to see if there is a task that is affined only to offline CPUs but
-+ * still wants runtime. This happens to kernel threads during suspend/halt and
-+ * disabling of CPUs.
-+ */
-+static inline bool online_cpus(struct task_struct *p)
-+{
-+ return (likely(cpus_intersects(cpu_online_map, p->cpus_allowed)));
-+}
-+#else /* CONFIG_HOTPLUG_CPU */
-+/* All available CPUs are always online without hotplug. */
-+static inline bool online_cpus(struct task_struct *p)
-+{
-+ return true;
-+}
-+#endif
-+
-+/*
-+ * Check to see if p can run on cpu, and if not, whether there are any online
-+ * CPUs it can run on instead.
-+ */
-+static inline bool needs_other_cpu(struct task_struct *p, int cpu)
-+{
-+ if (unlikely(!cpu_isset(cpu, p->cpus_allowed)))
-+ return true;
-+ return false;
-+}
-+
-+/*
-+ * When all else is equal, still prefer this_rq.
-+ */
-+static void try_preempt(struct task_struct *p, struct rq *this_rq)
-+{
-+ struct rq *highest_prio_rq = NULL;
-+ int cpu, highest_prio;
-+ u64 latest_deadline;
-+ cpumask_t tmp;
-+
-+ /*
-+ * We clear the sticky flag here because for a task to have called
-+ * try_preempt with the sticky flag enabled means some complicated
-+ * re-scheduling has occurred and we should ignore the sticky flag.
-+ */
-+ clear_sticky(p);
-+
-+ if (suitable_idle_cpus(p)) {
-+ resched_best_idle(p);
-+ return;
-+ }
-+
-+ /* IDLEPRIO tasks never preempt anything but idle */
-+ if (p->policy == SCHED_IDLEPRIO)
-+ return;
-+
-+ if (likely(online_cpus(p)))
-+ cpus_and(tmp, cpu_online_map, p->cpus_allowed);
-+ else
-+ return;
-+
-+ highest_prio = latest_deadline = 0;
-+
-+ for_each_cpu_mask(cpu, tmp) {
-+ struct rq *rq;
-+ int rq_prio;
-+
-+ rq = cpu_rq(cpu);
-+ rq_prio = rq->rq_prio;
-+ if (rq_prio < highest_prio)
-+ continue;
-+
-+ if (rq_prio > highest_prio ||
-+ deadline_after(rq->rq_deadline, latest_deadline)) {
-+ latest_deadline = rq->rq_deadline;
-+ highest_prio = rq_prio;
-+ highest_prio_rq = rq;
-+ }
-+ }
-+
-+ if (likely(highest_prio_rq)) {
-+ if (can_preempt(p, highest_prio, highest_prio_rq->rq_deadline))
-+ resched_task(highest_prio_rq->curr);
-+ }
-+}
-+#else /* CONFIG_SMP */
-+static inline bool needs_other_cpu(struct task_struct *p, int cpu)
-+{
-+ return false;
-+}
-+
-+static void try_preempt(struct task_struct *p, struct rq *this_rq)
-+{
-+ if (p->policy == SCHED_IDLEPRIO)
-+ return;
-+ if (can_preempt(p, uprq->rq_prio, uprq->rq_deadline))
-+ resched_task(uprq->curr);
-+}
-+#endif /* CONFIG_SMP */
-+
-+static void
-+ttwu_stat(struct task_struct *p, int cpu, int wake_flags)
-+{
-+#ifdef CONFIG_SCHEDSTATS
-+ struct rq *rq = this_rq();
-+
-+#ifdef CONFIG_SMP
-+ int this_cpu = smp_processor_id();
-+
-+ if (cpu == this_cpu)
-+ schedstat_inc(rq, ttwu_local);
-+ else {
-+ struct sched_domain *sd;
-+
-+ rcu_read_lock();
-+ for_each_domain(this_cpu, sd) {
-+ if (cpumask_test_cpu(cpu, sched_domain_span(sd))) {
-+ schedstat_inc(sd, ttwu_wake_remote);
-+ break;
-+ }
-+ }
-+ rcu_read_unlock();
-+ }
-+
-+#endif /* CONFIG_SMP */
-+
-+ schedstat_inc(rq, ttwu_count);
-+#endif /* CONFIG_SCHEDSTATS */
-+}
-+
-+static inline void ttwu_activate(struct task_struct *p, struct rq *rq,
-+ bool is_sync)
-+{
-+ activate_task(p, rq);
-+
-+ /*
-+ * Sync wakeups (i.e. those types of wakeups where the waker
-+ * has indicated that it will leave the CPU in short order)
-+ * don't trigger a preemption if there are no idle cpus,
-+ * instead waiting for current to deschedule.
-+ */
-+ if (!is_sync || suitable_idle_cpus(p))
-+ try_preempt(p, rq);
-+}
-+
-+static inline void ttwu_post_activation(struct task_struct *p, struct rq *rq,
-+ bool success)
-+{
-+ trace_sched_wakeup(p, success);
-+ p->state = TASK_RUNNING;
-+
-+ /*
-+ * if a worker is waking up, notify workqueue. Note that on BFS, we
-+ * don't really know what cpu it will be, so we fake it for
-+ * wq_worker_waking_up :/
-+ */
-+ if ((p->flags & PF_WQ_WORKER) && success)
-+ wq_worker_waking_up(p, cpu_of(rq));
-+}
-+
-+#ifdef CONFIG_SMP
-+void scheduler_ipi(void)
-+{
-+}
-+#endif /* CONFIG_SMP */
-+
-+/*
-+ * wake flags
-+ */
-+#define WF_SYNC 0x01 /* waker goes to sleep after wakeup */
-+#define WF_FORK 0x02 /* child wakeup after fork */
-+#define WF_MIGRATED 0x4 /* internal use, task got migrated */
-+
-+/***
-+ * try_to_wake_up - wake up a thread
-+ * @p: the thread to be awakened
-+ * @state: the mask of task states that can be woken
-+ * @wake_flags: wake modifier flags (WF_*)
-+ *
-+ * Put it on the run-queue if it's not already there. The "current"
-+ * thread is always on the run-queue (except when the actual
-+ * re-schedule is in progress), and as such you're allowed to do
-+ * the simpler "current->state = TASK_RUNNING" to mark yourself
-+ * runnable without the overhead of this.
-+ *
-+ * Returns %true if @p was woken up, %false if it was already running
-+ * or @state didn't match @p's state.
-+ */
-+static bool try_to_wake_up(struct task_struct *p, unsigned int state,
-+ int wake_flags)
-+{
-+ bool success = false;
-+ unsigned long flags;
-+ struct rq *rq;
-+ int cpu;
-+
-+ get_cpu();
-+
-+ /* This barrier is undocumented, probably for p->state? くそ */
-+ smp_wmb();
-+
-+ /*
-+ * No need to do time_lock_grq as we only need to update the rq clock
-+ * if we activate the task
-+ */
-+ rq = task_grq_lock(p, &flags);
-+ cpu = task_cpu(p);
-+
-+ /* state is a volatile long, どうして、分からない */
-+ if (!((unsigned int)p->state & state))
-+ goto out_unlock;
-+
-+ if (task_queued(p) || task_running(p))
-+ goto out_running;
-+
-+ ttwu_activate(p, rq, wake_flags & WF_SYNC);
-+ success = true;
-+
-+out_running:
-+ ttwu_post_activation(p, rq, success);
-+out_unlock:
-+ task_grq_unlock(&flags);
-+
-+ ttwu_stat(p, cpu, wake_flags);
-+
-+ put_cpu();
-+
-+ return success;
-+}
-+
-+/**
-+ * try_to_wake_up_local - try to wake up a local task with grq lock held
-+ * @p: the thread to be awakened
-+ *
-+ * Put @p on the run-queue if it's not already there. The caller must
-+ * ensure that grq is locked and, @p is not the current task.
-+ * grq stays locked over invocation.
-+ */
-+static void try_to_wake_up_local(struct task_struct *p)
-+{
-+ struct rq *rq = task_rq(p);
-+ bool success = false;
-+
-+ lockdep_assert_held(&grq.lock);
-+
-+ if (!(p->state & TASK_NORMAL))
-+ return;
-+
-+ if (!task_queued(p)) {
-+ if (likely(!task_running(p))) {
-+ schedstat_inc(rq, ttwu_count);
-+ schedstat_inc(rq, ttwu_local);
-+ }
-+ ttwu_activate(p, rq, false);
-+ ttwu_stat(p, smp_processor_id(), 0);
-+ success = true;
-+ }
-+ ttwu_post_activation(p, rq, success);
-+}
-+
-+/**
-+ * wake_up_process - Wake up a specific process
-+ * @p: The process to be woken up.
-+ *
-+ * Attempt to wake up the nominated process and move it to the set of runnable
-+ * processes. Returns 1 if the process was woken up, 0 if it was already
-+ * running.
-+ *
-+ * It may be assumed that this function implies a write memory barrier before
-+ * changing the task state if and only if any tasks are woken up.
-+ */
-+int wake_up_process(struct task_struct *p)
-+{
-+ WARN_ON(task_is_stopped_or_traced(p));
-+ return try_to_wake_up(p, TASK_NORMAL, 0);
-+}
-+EXPORT_SYMBOL(wake_up_process);
-+
-+int wake_up_state(struct task_struct *p, unsigned int state)
-+{
-+ return try_to_wake_up(p, state, 0);
-+}
-+
-+static void time_slice_expired(struct task_struct *p);
-+
-+/*
-+ * Perform scheduler related setup for a newly forked process p.
-+ * p is forked by current.
-+ */
-+void sched_fork(struct task_struct *p)
-+{
-+#ifdef CONFIG_PREEMPT_NOTIFIERS
-+ INIT_HLIST_HEAD(&p->preempt_notifiers);
-+#endif
-+ /*
-+ * The process state is set to the same value of the process executing
-+ * do_fork() code. That is running. This guarantees that nobody will
-+ * actually run it, and a signal or other external event cannot wake
-+ * it up and insert it on the runqueue either.
-+ */
-+
-+ /* Should be reset in fork.c but done here for ease of bfs patching */
-+ p->utime =
-+ p->stime =
-+ p->utimescaled =
-+ p->stimescaled =
-+ p->sched_time =
-+ p->stime_pc =
-+ p->utime_pc = 0;
-+
-+ /*
-+ * Revert to default priority/policy on fork if requested.
-+ */
-+ if (unlikely(p->sched_reset_on_fork)) {
-+ if (p->policy == SCHED_FIFO || p->policy == SCHED_RR) {
-+ p->policy = SCHED_NORMAL;
-+ p->normal_prio = normal_prio(p);
-+ }
-+
-+ if (PRIO_TO_NICE(p->static_prio) < 0) {
-+ p->static_prio = NICE_TO_PRIO(0);
-+ p->normal_prio = p->static_prio;
-+ }
-+
-+ /*
-+ * We don't need the reset flag anymore after the fork. It has
-+ * fulfilled its duty:
-+ */
-+ p->sched_reset_on_fork = 0;
-+ }
-+
-+ INIT_LIST_HEAD(&p->run_list);
-+#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
-+ if (unlikely(sched_info_on()))
-+ memset(&p->sched_info, 0, sizeof(p->sched_info));
-+#endif
-+ p->on_cpu = false;
-+ clear_sticky(p);
-+
-+#ifdef CONFIG_PREEMPT_COUNT
-+ /* Want to start with kernel preemption disabled. */
-+ task_thread_info(p)->preempt_count = 1;
-+#endif
-+}
-+
-+/*
-+ * wake_up_new_task - wake up a newly created task for the first time.
-+ *
-+ * This function will do some initial scheduler statistics housekeeping
-+ * that must be done for every newly created context, then puts the task
-+ * on the runqueue and wakes it.
-+ */
-+void wake_up_new_task(struct task_struct *p)
-+{
-+ struct task_struct *parent;
-+ unsigned long flags;
-+ struct rq *rq;
-+
-+ parent = p->parent;
-+ rq = task_grq_lock(p, &flags);
-+
-+ /*
-+ * Reinit new task deadline as its creator deadline could have changed
-+ * since call to dup_task_struct().
-+ */
-+ p->deadline = rq->rq_deadline;
-+
-+ /*
-+ * If the task is a new process, current and parent are the same. If
-+ * the task is a new thread in the thread group, it will have much more
-+ * in common with current than with the parent.
-+ */
-+ set_task_cpu(p, task_cpu(rq->curr));
-+
-+ /*
-+ * Make sure we do not leak PI boosting priority to the child.
-+ */
-+ p->prio = rq->curr->normal_prio;
-+
-+ activate_task(p, rq);
-+ trace_sched_wakeup_new(p, 1);
-+ if (unlikely(p->policy == SCHED_FIFO))
-+ goto after_ts_init;
-+
-+ /*
-+ * Share the timeslice between parent and child, thus the
-+ * total amount of pending timeslices in the system doesn't change,
-+ * resulting in more scheduling fairness. If it's negative, it won't
-+ * matter since that's the same as being 0. current's time_slice is
-+ * actually in rq_time_slice when it's running, as is its last_ran
-+ * value. rq->rq_deadline is only modified within schedule() so it
-+ * is always equal to current->deadline.
-+ */
-+ p->last_ran = rq->rq_last_ran;
-+ if (likely(rq->rq_time_slice >= RESCHED_US * 2)) {
-+ rq->rq_time_slice /= 2;
-+ p->time_slice = rq->rq_time_slice;
-+after_ts_init:
-+ if (rq->curr == parent && !suitable_idle_cpus(p)) {
-+ /*
-+ * The VM isn't cloned, so we're in a good position to
-+ * do child-runs-first in anticipation of an exec. This
-+ * usually avoids a lot of COW overhead.
-+ */
-+ set_tsk_need_resched(parent);
-+ } else
-+ try_preempt(p, rq);
-+ } else {
-+ if (rq->curr == parent) {
-+ /*
-+ * Forking task has run out of timeslice. Reschedule it and
-+ * start its child with a new time slice and deadline. The
-+ * child will end up running first because its deadline will
-+ * be slightly earlier.
-+ */
-+ rq->rq_time_slice = 0;
-+ set_tsk_need_resched(parent);
-+ }
-+ time_slice_expired(p);
-+ }
-+ task_grq_unlock(&flags);
-+}
-+
-+#ifdef CONFIG_PREEMPT_NOTIFIERS
-+
-+/**
-+ * preempt_notifier_register - tell me when current is being preempted & rescheduled
-+ * @notifier: notifier struct to register
-+ */
-+void preempt_notifier_register(struct preempt_notifier *notifier)
-+{
-+ hlist_add_head(&notifier->link, &current->preempt_notifiers);
-+}
-+EXPORT_SYMBOL_GPL(preempt_notifier_register);
-+
-+/**
-+ * preempt_notifier_unregister - no longer interested in preemption notifications
-+ * @notifier: notifier struct to unregister
-+ *
-+ * This is safe to call from within a preemption notifier.
-+ */
-+void preempt_notifier_unregister(struct preempt_notifier *notifier)
-+{
-+ hlist_del(&notifier->link);
-+}
-+EXPORT_SYMBOL_GPL(preempt_notifier_unregister);
-+
-+static void fire_sched_in_preempt_notifiers(struct task_struct *curr)
-+{
-+ struct preempt_notifier *notifier;
-+
-+ hlist_for_each_entry(notifier, &curr->preempt_notifiers, link)
-+ notifier->ops->sched_in(notifier, raw_smp_processor_id());
-+}
-+
-+static void
-+fire_sched_out_preempt_notifiers(struct task_struct *curr,
-+ struct task_struct *next)
-+{
-+ struct preempt_notifier *notifier;
-+
-+ hlist_for_each_entry(notifier, &curr->preempt_notifiers, link)
-+ notifier->ops->sched_out(notifier, next);
-+}
-+
-+#else /* !CONFIG_PREEMPT_NOTIFIERS */
-+
-+static void fire_sched_in_preempt_notifiers(struct task_struct *curr)
-+{
-+}
-+
-+static void
-+fire_sched_out_preempt_notifiers(struct task_struct *curr,
-+ struct task_struct *next)
-+{
-+}
-+
-+#endif /* CONFIG_PREEMPT_NOTIFIERS */
-+
-+/**
-+ * prepare_task_switch - prepare to switch tasks
-+ * @rq: the runqueue preparing to switch
-+ * @next: the task we are going to switch to.
-+ *
-+ * This is called with the rq lock held and interrupts off. It must
-+ * be paired with a subsequent finish_task_switch after the context
-+ * switch.
-+ *
-+ * prepare_task_switch sets up locking and calls architecture specific
-+ * hooks.
-+ */
-+static inline void
-+prepare_task_switch(struct rq *rq, struct task_struct *prev,
-+ struct task_struct *next)
-+{
-+ sched_info_switch(prev, next);
-+ perf_event_task_sched_out(prev, next);
-+ fire_sched_out_preempt_notifiers(prev, next);
-+ prepare_lock_switch(rq, next);
-+ prepare_arch_switch(next);
-+ trace_sched_switch(prev, next);
-+}
-+
-+/**
-+ * finish_task_switch - clean up after a task-switch
-+ * @rq: runqueue associated with task-switch
-+ * @prev: the thread we just switched away from.
-+ *
-+ * finish_task_switch must be called after the context switch, paired
-+ * with a prepare_task_switch call before the context switch.
-+ * finish_task_switch will reconcile locking set up by prepare_task_switch,
-+ * and do any other architecture-specific cleanup actions.
-+ *
-+ * Note that we may have delayed dropping an mm in context_switch(). If
-+ * so, we finish that here outside of the runqueue lock. (Doing it
-+ * with the lock held can cause deadlocks; see schedule() for
-+ * details.)
-+ */
-+static inline void finish_task_switch(struct rq *rq, struct task_struct *prev)
-+ __releases(grq.lock)
-+{
-+ struct mm_struct *mm = rq->prev_mm;
-+ long prev_state;
-+
-+ rq->prev_mm = NULL;
-+
-+ /*
-+ * A task struct has one reference for the use as "current".
-+ * If a task dies, then it sets TASK_DEAD in tsk->state and calls
-+ * schedule one last time. The schedule call will never return, and
-+ * the scheduled task must drop that reference.
-+ * The test for TASK_DEAD must occur while the runqueue locks are
-+ * still held, otherwise prev could be scheduled on another cpu, die
-+ * there before we look at prev->state, and then the reference would
-+ * be dropped twice.
-+ * Manfred Spraul <manfred@colorfullife.com>
-+ */
-+ prev_state = prev->state;
-+ vtime_task_switch(prev);
-+ finish_arch_switch(prev);
-+ perf_event_task_sched_in(prev, current);
-+ finish_lock_switch(rq, prev);
-+ finish_arch_post_lock_switch();
-+
-+ fire_sched_in_preempt_notifiers(current);
-+ if (mm)
-+ mmdrop(mm);
-+ if (unlikely(prev_state == TASK_DEAD)) {
-+ /*
-+ * Remove function-return probe instances associated with this
-+ * task and put them back on the free list.
-+ */
-+ kprobe_flush_task(prev);
-+ put_task_struct(prev);
-+ }
-+}
-+
-+/**
-+ * schedule_tail - first thing a freshly forked thread must call.
-+ * @prev: the thread we just switched away from.
-+ */
-+asmlinkage void schedule_tail(struct task_struct *prev)
-+ __releases(grq.lock)
-+{
-+ struct rq *rq = this_rq();
-+
-+ finish_task_switch(rq, prev);
-+#ifdef __ARCH_WANT_UNLOCKED_CTXSW
-+ /* In this case, finish_task_switch does not reenable preemption */
-+ preempt_enable();
-+#endif
-+ if (current->set_child_tid)
-+ put_user(current->pid, current->set_child_tid);
-+}
-+
-+/*
-+ * context_switch - switch to the new MM and the new
-+ * thread's register state.
-+ */
-+static inline void
-+context_switch(struct rq *rq, struct task_struct *prev,
-+ struct task_struct *next)
-+{
-+ struct mm_struct *mm, *oldmm;
-+
-+ prepare_task_switch(rq, prev, next);
-+
-+ mm = next->mm;
-+ oldmm = prev->active_mm;
-+ /*
-+ * For paravirt, this is coupled with an exit in switch_to to
-+ * combine the page table reload and the switch backend into
-+ * one hypercall.
-+ */
-+ arch_start_context_switch(prev);
-+
-+ if (!mm) {
-+ next->active_mm = oldmm;
-+ atomic_inc(&oldmm->mm_count);
-+ enter_lazy_tlb(oldmm, next);
-+ } else
-+ switch_mm(oldmm, mm, next);
-+
-+ if (!prev->mm) {
-+ prev->active_mm = NULL;
-+ rq->prev_mm = oldmm;
-+ }
-+ /*
-+ * Since the runqueue lock will be released by the next
-+ * task (which is an invalid locking op but in the case
-+ * of the scheduler it's an obvious special-case), so we
-+ * do an early lockdep release here:
-+ */
-+#ifndef __ARCH_WANT_UNLOCKED_CTXSW
-+ spin_release(&grq.lock.dep_map, 1, _THIS_IP_);
-+#endif
-+
-+ /* Here we just switch the register state and the stack. */
-+ context_tracking_task_switch(prev, next);
-+ switch_to(prev, next, prev);
-+
-+ barrier();
-+ /*
-+ * this_rq must be evaluated again because prev may have moved
-+ * CPUs since it called schedule(), thus the 'rq' on its stack
-+ * frame will be invalid.
-+ */
-+ finish_task_switch(this_rq(), prev);
-+}
-+
-+/*
-+ * nr_running, nr_uninterruptible and nr_context_switches:
-+ *
-+ * externally visible scheduler statistics: current number of runnable
-+ * threads, total number of context switches performed since bootup. All are
-+ * measured without grabbing the grq lock but the occasional inaccurate result
-+ * doesn't matter so long as it's positive.
-+ */
-+unsigned long nr_running(void)
-+{
-+ long nr = grq.nr_running;
-+
-+ if (unlikely(nr < 0))
-+ nr = 0;
-+ return (unsigned long)nr;
-+}
-+
-+static unsigned long nr_uninterruptible(void)
-+{
-+ long nu = grq.nr_uninterruptible;
-+
-+ if (unlikely(nu < 0))
-+ nu = 0;
-+ return nu;
-+}
-+
-+unsigned long long nr_context_switches(void)
-+{
-+ long long ns = grq.nr_switches;
-+
-+ /* This is of course impossible */
-+ if (unlikely(ns < 0))
-+ ns = 1;
-+ return (unsigned long long)ns;
-+}
-+
-+unsigned long nr_iowait(void)
-+{
-+ unsigned long i, sum = 0;
-+
-+ for_each_possible_cpu(i)
-+ sum += atomic_read(&cpu_rq(i)->nr_iowait);
-+
-+ return sum;
-+}
-+
-+unsigned long nr_iowait_cpu(int cpu)
-+{
-+ struct rq *this = cpu_rq(cpu);
-+ return atomic_read(&this->nr_iowait);
-+}
-+
-+unsigned long nr_active(void)
-+{
-+ return nr_running() + nr_uninterruptible();
-+}
-+
-+/* Beyond a task running on this CPU, load is equal everywhere on BFS */
-+unsigned long this_cpu_load(void)
-+{
-+ return this_rq()->rq_running +
-+ ((queued_notrunning() + nr_uninterruptible()) / grq.noc);
-+}
-+
-+/* Variables and functions for calc_load */
-+static unsigned long calc_load_update;
-+unsigned long avenrun[3];
-+EXPORT_SYMBOL(avenrun);
-+
-+/**
-+ * get_avenrun - get the load average array
-+ * @loads: pointer to dest load array
-+ * @offset: offset to add
-+ * @shift: shift count to shift the result left
-+ *
-+ * These values are estimates at best, so no need for locking.
-+ */
-+void get_avenrun(unsigned long *loads, unsigned long offset, int shift)
-+{
-+ loads[0] = (avenrun[0] + offset) << shift;
-+ loads[1] = (avenrun[1] + offset) << shift;
-+ loads[2] = (avenrun[2] + offset) << shift;
-+}
-+
-+static unsigned long
-+calc_load(unsigned long load, unsigned long exp, unsigned long active)
-+{
-+ load *= exp;
-+ load += active * (FIXED_1 - exp);
-+ return load >> FSHIFT;
-+}
-+
-+/*
-+ * calc_load - update the avenrun load estimates every LOAD_FREQ seconds.
-+ */
-+void calc_global_load(unsigned long ticks)
-+{
-+ long active;
-+
-+ if (time_before(jiffies, calc_load_update))
-+ return;
-+ active = nr_active() * FIXED_1;
-+
-+ avenrun[0] = calc_load(avenrun[0], EXP_1, active);
-+ avenrun[1] = calc_load(avenrun[1], EXP_5, active);
-+ avenrun[2] = calc_load(avenrun[2], EXP_15, active);
-+
-+ calc_load_update = jiffies + LOAD_FREQ;
-+}
-+
-+DEFINE_PER_CPU(struct kernel_stat, kstat);
-+DEFINE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
-+
-+EXPORT_PER_CPU_SYMBOL(kstat);
-+EXPORT_PER_CPU_SYMBOL(kernel_cpustat);
-+
-+#ifdef CONFIG_IRQ_TIME_ACCOUNTING
-+
-+/*
-+ * There are no locks covering percpu hardirq/softirq time.
-+ * They are only modified in account_system_vtime, on corresponding CPU
-+ * with interrupts disabled. So, writes are safe.
-+ * They are read and saved off onto struct rq in update_rq_clock().
-+ * This may result in other CPU reading this CPU's irq time and can
-+ * race with irq/account_system_vtime on this CPU. We would either get old
-+ * or new value with a side effect of accounting a slice of irq time to wrong
-+ * task when irq is in progress while we read rq->clock. That is a worthy
-+ * compromise in place of having locks on each irq in account_system_time.
-+ */
-+static DEFINE_PER_CPU(u64, cpu_hardirq_time);
-+static DEFINE_PER_CPU(u64, cpu_softirq_time);
-+
-+static DEFINE_PER_CPU(u64, irq_start_time);
-+static int sched_clock_irqtime;
-+
-+void enable_sched_clock_irqtime(void)
-+{
-+ sched_clock_irqtime = 1;
-+}
-+
-+void disable_sched_clock_irqtime(void)
-+{
-+ sched_clock_irqtime = 0;
-+}
-+
-+#ifndef CONFIG_64BIT
-+static DEFINE_PER_CPU(seqcount_t, irq_time_seq);
-+
-+static inline void irq_time_write_begin(void)
-+{
-+ __this_cpu_inc(irq_time_seq.sequence);
-+ smp_wmb();
-+}
-+
-+static inline void irq_time_write_end(void)
-+{
-+ smp_wmb();
-+ __this_cpu_inc(irq_time_seq.sequence);
-+}
-+
-+static inline u64 irq_time_read(int cpu)
-+{
-+ u64 irq_time;
-+ unsigned seq;
-+
-+ do {
-+ seq = read_seqcount_begin(&per_cpu(irq_time_seq, cpu));
-+ irq_time = per_cpu(cpu_softirq_time, cpu) +
-+ per_cpu(cpu_hardirq_time, cpu);
-+ } while (read_seqcount_retry(&per_cpu(irq_time_seq, cpu), seq));
-+
-+ return irq_time;
-+}
-+#else /* CONFIG_64BIT */
-+static inline void irq_time_write_begin(void)
-+{
-+}
-+
-+static inline void irq_time_write_end(void)
-+{
-+}
-+
-+static inline u64 irq_time_read(int cpu)
-+{
-+ return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu);
-+}
-+#endif /* CONFIG_64BIT */
-+
-+/*
-+ * Called before incrementing preempt_count on {soft,}irq_enter
-+ * and before decrementing preempt_count on {soft,}irq_exit.
-+ */
-+void irqtime_account_irq(struct task_struct *curr)
-+{
-+ unsigned long flags;
-+ s64 delta;
-+ int cpu;
-+
-+ if (!sched_clock_irqtime)
-+ return;
-+
-+ local_irq_save(flags);
-+
-+ cpu = smp_processor_id();
-+ delta = sched_clock_cpu(cpu) - __this_cpu_read(irq_start_time);
-+ __this_cpu_add(irq_start_time, delta);
-+
-+ irq_time_write_begin();
-+ /*
-+ * We do not account for softirq time from ksoftirqd here.
-+ * We want to continue accounting softirq time to ksoftirqd thread
-+ * in that case, so as not to confuse scheduler with a special task
-+ * that do not consume any time, but still wants to run.
-+ */
-+ if (hardirq_count())
-+ __this_cpu_add(cpu_hardirq_time, delta);
-+ else if (in_serving_softirq() && curr != this_cpu_ksoftirqd())
-+ __this_cpu_add(cpu_softirq_time, delta);
-+
-+ irq_time_write_end();
-+ local_irq_restore(flags);
-+}
-+EXPORT_SYMBOL_GPL(irqtime_account_irq);
-+
-+#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
-+
-+#ifdef CONFIG_PARAVIRT
-+static inline u64 steal_ticks(u64 steal)
-+{
-+ if (unlikely(steal > NSEC_PER_SEC))
-+ return div_u64(steal, TICK_NSEC);
-+
-+ return __iter_div_u64_rem(steal, TICK_NSEC, &steal);
-+}
-+#endif
-+
-+static void update_rq_clock_task(struct rq *rq, s64 delta)
-+{
-+/*
-+ * In theory, the compile should just see 0 here, and optimize out the call
-+ * to sched_rt_avg_update. But I don't trust it...
-+ */
-+#ifdef CONFIG_IRQ_TIME_ACCOUNTING
-+ s64 irq_delta = irq_time_read(cpu_of(rq)) - rq->prev_irq_time;
-+
-+ /*
-+ * Since irq_time is only updated on {soft,}irq_exit, we might run into
-+ * this case when a previous update_rq_clock() happened inside a
-+ * {soft,}irq region.
-+ *
-+ * When this happens, we stop ->clock_task and only update the
-+ * prev_irq_time stamp to account for the part that fit, so that a next
-+ * update will consume the rest. This ensures ->clock_task is
-+ * monotonic.
-+ *
-+ * It does however cause some slight miss-attribution of {soft,}irq
-+ * time, a more accurate solution would be to update the irq_time using
-+ * the current rq->clock timestamp, except that would require using
-+ * atomic ops.
-+ */
-+ if (irq_delta > delta)
-+ irq_delta = delta;
-+
-+ rq->prev_irq_time += irq_delta;
-+ delta -= irq_delta;
-+#endif
-+#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
-+ if (static_key_false((&paravirt_steal_rq_enabled))) {
-+ s64 steal = paravirt_steal_clock(cpu_of(rq));
-+ u64 st;
-+
-+ steal -= rq->prev_steal_time_rq;
-+
-+ if (unlikely(steal > delta))
-+ steal = delta;
-+
-+ st = steal_ticks(steal);
-+ steal = st * TICK_NSEC;
-+
-+ rq->prev_steal_time_rq += steal;
-+
-+ delta -= steal;
-+ }
-+#endif
-+
-+ rq->clock_task += delta;
-+}
-+
-+#ifndef nsecs_to_cputime
-+# define nsecs_to_cputime(__nsecs) nsecs_to_jiffies(__nsecs)
-+#endif
-+
-+#ifdef CONFIG_IRQ_TIME_ACCOUNTING
-+static void irqtime_account_hi_si(void)
-+{
-+ u64 *cpustat = kcpustat_this_cpu->cpustat;
-+ u64 latest_ns;
-+
-+ latest_ns = nsecs_to_cputime64(this_cpu_read(cpu_hardirq_time));
-+ if (latest_ns > cpustat[CPUTIME_IRQ])
-+ cpustat[CPUTIME_IRQ] += (__force u64)cputime_one_jiffy;
-+
-+ latest_ns = nsecs_to_cputime64(this_cpu_read(cpu_softirq_time));
-+ if (latest_ns > cpustat[CPUTIME_SOFTIRQ])
-+ cpustat[CPUTIME_SOFTIRQ] += (__force u64)cputime_one_jiffy;
-+}
-+#else /* CONFIG_IRQ_TIME_ACCOUNTING */
-+
-+#define sched_clock_irqtime (0)
-+
-+static inline void irqtime_account_hi_si(void)
-+{
-+}
-+#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
-+
-+static __always_inline bool steal_account_process_tick(void)
-+{
-+#ifdef CONFIG_PARAVIRT
-+ if (static_key_false(&paravirt_steal_enabled)) {
-+ u64 steal, st = 0;
-+
-+ steal = paravirt_steal_clock(smp_processor_id());
-+ steal -= this_rq()->prev_steal_time;
-+
-+ st = steal_ticks(steal);
-+ this_rq()->prev_steal_time += st * TICK_NSEC;
-+
-+ account_steal_time(st);
-+ return st;
-+ }
-+#endif
-+ return false;
-+}
-+
-+/*
-+ * Accumulate raw cputime values of dead tasks (sig->[us]time) and live
-+ * tasks (sum on group iteration) belonging to @tsk's group.
-+ */
-+void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
-+{
-+ struct signal_struct *sig = tsk->signal;
-+ cputime_t utime, stime;
-+ struct task_struct *t;
-+
-+ times->utime = sig->utime;
-+ times->stime = sig->stime;
-+ times->sum_exec_runtime = sig->sum_sched_runtime;
-+
-+ rcu_read_lock();
-+ /* make sure we can trust tsk->thread_group list */
-+ if (!likely(pid_alive(tsk)))
-+ goto out;
-+
-+ t = tsk;
-+ do {
-+ task_cputime(t, &utime, &stime);
-+ times->utime += utime;
-+ times->stime += stime;
-+ times->sum_exec_runtime += task_sched_runtime(t);
-+ } while_each_thread(tsk, t);
-+out:
-+ rcu_read_unlock();
-+}
-+
-+/*
-+ * On each tick, see what percentage of that tick was attributed to each
-+ * component and add the percentage to the _pc values. Once a _pc value has
-+ * accumulated one tick's worth, account for that. This means the total
-+ * percentage of load components will always be 128 (pseudo 100) per tick.
-+ */
-+static void pc_idle_time(struct rq *rq, struct task_struct *idle, unsigned long pc)
-+{
-+ u64 *cpustat = kcpustat_this_cpu->cpustat;
-+
-+ if (atomic_read(&rq->nr_iowait) > 0) {
-+ rq->iowait_pc += pc;
-+ if (rq->iowait_pc >= 128) {
-+ cpustat[CPUTIME_IOWAIT] += (__force u64)cputime_one_jiffy * rq->iowait_pc / 128;
-+ rq->iowait_pc %= 128;
-+ }
-+ } else {
-+ rq->idle_pc += pc;
-+ if (rq->idle_pc >= 128) {
-+ cpustat[CPUTIME_IDLE] += (__force u64)cputime_one_jiffy * rq->idle_pc / 128;
-+ rq->idle_pc %= 128;
-+ }
-+ }
-+ acct_update_integrals(idle);
-+}
-+
-+static void
-+pc_system_time(struct rq *rq, struct task_struct *p, int hardirq_offset,
-+ unsigned long pc, unsigned long ns)
-+{
-+ u64 *cpustat = kcpustat_this_cpu->cpustat;
-+ cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
-+
-+ p->stime_pc += pc;
-+ if (p->stime_pc >= 128) {
-+ int jiffs = p->stime_pc / 128;
-+
-+ p->stime_pc %= 128;
-+ p->stime += (__force u64)cputime_one_jiffy * jiffs;
-+ p->stimescaled += one_jiffy_scaled * jiffs;
-+ account_group_system_time(p, cputime_one_jiffy * jiffs);
-+ }
-+ p->sched_time += ns;
-+ /*
-+ * Do not update the cputimer if the task is already released by
-+ * release_task().
-+ *
-+ * This could be executed if a tick happens when a task is inside
-+ * do_exit() between the call to release_task() and its final
-+ * schedule() call for autoreaping tasks.
-+ */
-+ if (likely(p->sighand))
-+ account_group_exec_runtime(p, ns);
-+
-+ if (hardirq_count() - hardirq_offset) {
-+ rq->irq_pc += pc;
-+ if (rq->irq_pc >= 128) {
-+ cpustat[CPUTIME_IRQ] += (__force u64)cputime_one_jiffy * rq->irq_pc / 128;
-+ rq->irq_pc %= 128;
-+ }
-+ } else if (in_serving_softirq()) {
-+ rq->softirq_pc += pc;
-+ if (rq->softirq_pc >= 128) {
-+ cpustat[CPUTIME_SOFTIRQ] += (__force u64)cputime_one_jiffy * rq->softirq_pc / 128;
-+ rq->softirq_pc %= 128;
-+ }
-+ } else {
-+ rq->system_pc += pc;
-+ if (rq->system_pc >= 128) {
-+ cpustat[CPUTIME_SYSTEM] += (__force u64)cputime_one_jiffy * rq->system_pc / 128;
-+ rq->system_pc %= 128;
-+ }
-+ }
-+ acct_update_integrals(p);
-+}
-+
-+static void pc_user_time(struct rq *rq, struct task_struct *p,
-+ unsigned long pc, unsigned long ns)
-+{
-+ u64 *cpustat = kcpustat_this_cpu->cpustat;
-+ cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
-+
-+ p->utime_pc += pc;
-+ if (p->utime_pc >= 128) {
-+ int jiffs = p->utime_pc / 128;
-+
-+ p->utime_pc %= 128;
-+ p->utime += (__force u64)cputime_one_jiffy * jiffs;
-+ p->utimescaled += one_jiffy_scaled * jiffs;
-+ account_group_user_time(p, cputime_one_jiffy * jiffs);
-+ }
-+ p->sched_time += ns;
-+ /*
-+ * Do not update the cputimer if the task is already released by
-+ * release_task().
-+ *
-+ * it would preferable to defer the autoreap release_task
-+ * after the last context switch but harder to do.
-+ */
-+ if (likely(p->sighand))
-+ account_group_exec_runtime(p, ns);
-+
-+ if (this_cpu_ksoftirqd() == p) {
-+ /*
-+ * ksoftirqd time do not get accounted in cpu_softirq_time.
-+ * So, we have to handle it separately here.
-+ */
-+ rq->softirq_pc += pc;
-+ if (rq->softirq_pc >= 128) {
-+ cpustat[CPUTIME_SOFTIRQ] += (__force u64)cputime_one_jiffy * rq->softirq_pc / 128;
-+ rq->softirq_pc %= 128;
-+ }
-+ }
-+
-+ if (TASK_NICE(p) > 0 || idleprio_task(p)) {
-+ rq->nice_pc += pc;
-+ if (rq->nice_pc >= 128) {
-+ cpustat[CPUTIME_NICE] += (__force u64)cputime_one_jiffy * rq->nice_pc / 128;
-+ rq->nice_pc %= 128;
-+ }
-+ } else {
-+ rq->user_pc += pc;
-+ if (rq->user_pc >= 128) {
-+ cpustat[CPUTIME_USER] += (__force u64)cputime_one_jiffy * rq->user_pc / 128;
-+ rq->user_pc %= 128;
-+ }
-+ }
-+ acct_update_integrals(p);
-+}
-+
-+/*
-+ * Convert nanoseconds to pseudo percentage of one tick. Use 128 for fast
-+ * shifts instead of 100
-+ */
-+#define NS_TO_PC(NS) (NS * 128 / JIFFY_NS)
-+
-+/*
-+ * This is called on clock ticks.
-+ * Bank in p->sched_time the ns elapsed since the last tick or switch.
-+ * CPU scheduler quota accounting is also performed here in microseconds.
-+ */
-+static void
-+update_cpu_clock_tick(struct rq *rq, struct task_struct *p)
-+{
-+ long account_ns = rq->clock_task - rq->rq_last_ran;
-+ struct task_struct *idle = rq->idle;
-+ unsigned long account_pc;
-+
-+ if (unlikely(account_ns < 0) || steal_account_process_tick())
-+ goto ts_account;
-+
-+ account_pc = NS_TO_PC(account_ns);
-+
-+ /* Accurate tick timekeeping */
-+ if (user_mode(get_irq_regs()))
-+ pc_user_time(rq, p, account_pc, account_ns);
-+ else if (p != idle || (irq_count() != HARDIRQ_OFFSET))
-+ pc_system_time(rq, p, HARDIRQ_OFFSET,
-+ account_pc, account_ns);
-+ else
-+ pc_idle_time(rq, idle, account_pc);
-+
-+ if (sched_clock_irqtime)
-+ irqtime_account_hi_si();
-+
-+ts_account:
-+ /* time_slice accounting is done in usecs to avoid overflow on 32bit */
-+ if (rq->rq_policy != SCHED_FIFO && p != idle) {
-+ s64 time_diff = rq->clock - rq->timekeep_clock;
-+
-+ niffy_diff(&time_diff, 1);
-+ rq->rq_time_slice -= NS_TO_US(time_diff);
-+ }
-+
-+ rq->rq_last_ran = rq->clock_task;
-+ rq->timekeep_clock = rq->clock;
-+}
-+
-+/*
-+ * This is called on context switches.
-+ * Bank in p->sched_time the ns elapsed since the last tick or switch.
-+ * CPU scheduler quota accounting is also performed here in microseconds.
-+ */
-+static void
-+update_cpu_clock_switch(struct rq *rq, struct task_struct *p)
-+{
-+ long account_ns = rq->clock_task - rq->rq_last_ran;
-+ struct task_struct *idle = rq->idle;
-+ unsigned long account_pc;
-+
-+ if (unlikely(account_ns < 0))
-+ goto ts_account;
-+
-+ account_pc = NS_TO_PC(account_ns);
-+
-+ /* Accurate subtick timekeeping */
-+ if (p != idle) {
-+ pc_user_time(rq, p, account_pc, account_ns);
-+ }
-+ else
-+ pc_idle_time(rq, idle, account_pc);
-+
-+ts_account:
-+ /* time_slice accounting is done in usecs to avoid overflow on 32bit */
-+ if (rq->rq_policy != SCHED_FIFO && p != idle) {
-+ s64 time_diff = rq->clock - rq->timekeep_clock;
-+
-+ niffy_diff(&time_diff, 1);
-+ rq->rq_time_slice -= NS_TO_US(time_diff);
-+ }
-+
-+ rq->rq_last_ran = rq->clock_task;
-+ rq->timekeep_clock = rq->clock;
-+}
-+
-+/*
-+ * Return any ns on the sched_clock that have not yet been accounted in
-+ * @p in case that task is currently running.
-+ *
-+ * Called with task_grq_lock() held.
-+ */
-+static u64 do_task_delta_exec(struct task_struct *p, struct rq *rq)
-+{
-+ u64 ns = 0;
-+
-+ if (p == rq->curr) {
-+ update_clocks(rq);
-+ ns = rq->clock_task - rq->rq_last_ran;
-+ if (unlikely((s64)ns < 0))
-+ ns = 0;
-+ }
-+
-+ return ns;
-+}
-+
-+unsigned long long task_delta_exec(struct task_struct *p)
-+{
-+ unsigned long flags;
-+ struct rq *rq;
-+ u64 ns;
-+
-+ rq = task_grq_lock(p, &flags);
-+ ns = do_task_delta_exec(p, rq);
-+ task_grq_unlock(&flags);
-+
-+ return ns;
-+}
-+
-+/*
-+ * Return accounted runtime for the task.
-+ * Return separately the current's pending runtime that have not been
-+ * accounted yet.
-+ *
-+ * grq lock already acquired.
-+ */
-+unsigned long long task_sched_runtime(struct task_struct *p)
-+{
-+ unsigned long flags;
-+ struct rq *rq;
-+ u64 ns;
-+
-+ rq = task_grq_lock(p, &flags);
-+ ns = p->sched_time + do_task_delta_exec(p, rq);
-+ task_grq_unlock(&flags);
-+
-+ return ns;
-+}
-+
-+/*
-+ * Return accounted runtime for the task.
-+ * Return separately the current's pending runtime that have not been
-+ * accounted yet.
-+ */
-+unsigned long long task_sched_runtime_nodelta(struct task_struct *p, unsigned long long *delta)
-+{
-+ unsigned long flags;
-+ struct rq *rq;
-+ u64 ns;
-+
-+ rq = task_grq_lock(p, &flags);
-+ ns = p->sched_time;
-+ *delta = do_task_delta_exec(p, rq);
-+ task_grq_unlock(&flags);
-+
-+ return ns;
-+}
-+
-+/* Compatibility crap */
-+void account_user_time(struct task_struct *p, cputime_t cputime,
-+ cputime_t cputime_scaled)
-+{
-+}
-+
-+void account_idle_time(cputime_t cputime)
-+{
-+}
-+
-+void update_cpu_load_nohz(void)
-+{
-+}
-+
-+#ifdef CONFIG_NO_HZ_COMMON
-+void calc_load_enter_idle(void)
-+{
-+}
-+
-+void calc_load_exit_idle(void)
-+{
-+}
-+#endif /* CONFIG_NO_HZ_COMMON */
-+
-+/*
-+ * Account guest cpu time to a process.
-+ * @p: the process that the cpu time gets accounted to
-+ * @cputime: the cpu time spent in virtual machine since the last update
-+ * @cputime_scaled: cputime scaled by cpu frequency
-+ */
-+static void account_guest_time(struct task_struct *p, cputime_t cputime,
-+ cputime_t cputime_scaled)
-+{
-+ u64 *cpustat = kcpustat_this_cpu->cpustat;
-+
-+ /* Add guest time to process. */
-+ p->utime += (__force u64)cputime;
-+ p->utimescaled += (__force u64)cputime_scaled;
-+ account_group_user_time(p, cputime);
-+ p->gtime += (__force u64)cputime;
-+
-+ /* Add guest time to cpustat. */
-+ if (TASK_NICE(p) > 0) {
-+ cpustat[CPUTIME_NICE] += (__force u64)cputime;
-+ cpustat[CPUTIME_GUEST_NICE] += (__force u64)cputime;
-+ } else {
-+ cpustat[CPUTIME_USER] += (__force u64)cputime;
-+ cpustat[CPUTIME_GUEST] += (__force u64)cputime;
-+ }
-+}
-+
-+/*
-+ * Account system cpu time to a process and desired cpustat field
-+ * @p: the process that the cpu time gets accounted to
-+ * @cputime: the cpu time spent in kernel space since the last update
-+ * @cputime_scaled: cputime scaled by cpu frequency
-+ * @target_cputime64: pointer to cpustat field that has to be updated
-+ */
-+static inline
-+void __account_system_time(struct task_struct *p, cputime_t cputime,
-+ cputime_t cputime_scaled, cputime64_t *target_cputime64)
-+{
-+ /* Add system time to process. */
-+ p->stime += (__force u64)cputime;
-+ p->stimescaled += (__force u64)cputime_scaled;
-+ account_group_system_time(p, cputime);
-+
-+ /* Add system time to cpustat. */
-+ *target_cputime64 += (__force u64)cputime;
-+
-+ /* Account for system time used */
-+ acct_update_integrals(p);
-+}
-+
-+/*
-+ * Account system cpu time to a process.
-+ * @p: the process that the cpu time gets accounted to
-+ * @hardirq_offset: the offset to subtract from hardirq_count()
-+ * @cputime: the cpu time spent in kernel space since the last update
-+ * @cputime_scaled: cputime scaled by cpu frequency
-+ * This is for guest only now.
-+ */
-+void account_system_time(struct task_struct *p, int hardirq_offset,
-+ cputime_t cputime, cputime_t cputime_scaled)
-+{
-+
-+ if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0))
-+ account_guest_time(p, cputime, cputime_scaled);
-+}
-+
-+/*
-+ * Account for involuntary wait time.
-+ * @steal: the cpu time spent in involuntary wait
-+ */
-+void account_steal_time(cputime_t cputime)
-+{
-+ u64 *cpustat = kcpustat_this_cpu->cpustat;
-+
-+ cpustat[CPUTIME_STEAL] += (__force u64)cputime;
-+}
-+
-+/*
-+ * Account for idle time.
-+ * @cputime: the cpu time spent in idle wait
-+ */
-+static void account_idle_times(cputime_t cputime)
-+{
-+ u64 *cpustat = kcpustat_this_cpu->cpustat;
-+ struct rq *rq = this_rq();
-+
-+ if (atomic_read(&rq->nr_iowait) > 0)
-+ cpustat[CPUTIME_IOWAIT] += (__force u64)cputime;
-+ else
-+ cpustat[CPUTIME_IDLE] += (__force u64)cputime;
-+}
-+
-+#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
-+
-+void account_process_tick(struct task_struct *p, int user_tick)
-+{
-+}
-+
-+/*
-+ * Account multiple ticks of steal time.
-+ * @p: the process from which the cpu time has been stolen
-+ * @ticks: number of stolen ticks
-+ */
-+void account_steal_ticks(unsigned long ticks)
-+{
-+ account_steal_time(jiffies_to_cputime(ticks));
-+}
-+
-+/*
-+ * Account multiple ticks of idle time.
-+ * @ticks: number of stolen ticks
-+ */
-+void account_idle_ticks(unsigned long ticks)
-+{
-+ account_idle_times(jiffies_to_cputime(ticks));
-+}
-+#endif
-+
-+static inline void grq_iso_lock(void)
-+ __acquires(grq.iso_lock)
-+{
-+ raw_spin_lock(&grq.iso_lock);
-+}
-+
-+static inline void grq_iso_unlock(void)
-+ __releases(grq.iso_lock)
-+{
-+ raw_spin_unlock(&grq.iso_lock);
-+}
-+
-+/*
-+ * Functions to test for when SCHED_ISO tasks have used their allocated
-+ * quota as real time scheduling and convert them back to SCHED_NORMAL.
-+ * Where possible, the data is tested lockless, to avoid grabbing iso_lock
-+ * because the occasional inaccurate result won't matter. However the
-+ * tick data is only ever modified under lock. iso_refractory is only simply
-+ * set to 0 or 1 so it's not worth grabbing the lock yet again for that.
-+ */
-+static bool set_iso_refractory(void)
-+{
-+ grq.iso_refractory = true;
-+ return grq.iso_refractory;
-+}
-+
-+static bool clear_iso_refractory(void)
-+{
-+ grq.iso_refractory = false;
-+ return grq.iso_refractory;
-+}
-+
-+/*
-+ * Test if SCHED_ISO tasks have run longer than their alloted period as RT
-+ * tasks and set the refractory flag if necessary. There is 10% hysteresis
-+ * for unsetting the flag. 115/128 is ~90/100 as a fast shift instead of a
-+ * slow division.
-+ */
-+static bool test_ret_isorefractory(struct rq *rq)
-+{
-+ if (likely(!grq.iso_refractory)) {
-+ if (grq.iso_ticks > ISO_PERIOD * sched_iso_cpu)
-+ return set_iso_refractory();
-+ } else {
-+ if (grq.iso_ticks < ISO_PERIOD * (sched_iso_cpu * 115 / 128))
-+ return clear_iso_refractory();
-+ }
-+ return grq.iso_refractory;
-+}
-+
-+static void iso_tick(void)
-+{
-+ grq_iso_lock();
-+ grq.iso_ticks += 100;
-+ grq_iso_unlock();
-+}
-+
-+/* No SCHED_ISO task was running so decrease rq->iso_ticks */
-+static inline void no_iso_tick(void)
-+{
-+ if (grq.iso_ticks) {
-+ grq_iso_lock();
-+ grq.iso_ticks -= grq.iso_ticks / ISO_PERIOD + 1;
-+ if (unlikely(grq.iso_refractory && grq.iso_ticks <
-+ ISO_PERIOD * (sched_iso_cpu * 115 / 128)))
-+ clear_iso_refractory();
-+ grq_iso_unlock();
-+ }
-+}
-+
-+/* This manages tasks that have run out of timeslice during a scheduler_tick */
-+static void task_running_tick(struct rq *rq)
-+{
-+ struct task_struct *p;
-+
-+ /*
-+ * If a SCHED_ISO task is running we increment the iso_ticks. In
-+ * order to prevent SCHED_ISO tasks from causing starvation in the
-+ * presence of true RT tasks we account those as iso_ticks as well.
-+ */
-+ if ((rt_queue(rq) || (iso_queue(rq) && !grq.iso_refractory))) {
-+ if (grq.iso_ticks <= (ISO_PERIOD * 128) - 128)
-+ iso_tick();
-+ } else
-+ no_iso_tick();
-+
-+ if (iso_queue(rq)) {
-+ if (unlikely(test_ret_isorefractory(rq))) {
-+ if (rq_running_iso(rq)) {
-+ /*
-+ * SCHED_ISO task is running as RT and limit
-+ * has been hit. Force it to reschedule as
-+ * SCHED_NORMAL by zeroing its time_slice
-+ */
-+ rq->rq_time_slice = 0;
-+ }
-+ }
-+ }
-+
-+ /* SCHED_FIFO tasks never run out of timeslice. */
-+ if (rq->rq_policy == SCHED_FIFO)
-+ return;
-+ /*
-+ * Tasks that were scheduled in the first half of a tick are not
-+ * allowed to run into the 2nd half of the next tick if they will
-+ * run out of time slice in the interim. Otherwise, if they have
-+ * less than RESCHED_US μs of time slice left they will be rescheduled.
-+ */
-+ if (rq->dither) {
-+ if (rq->rq_time_slice > HALF_JIFFY_US)
-+ return;
-+ else
-+ rq->rq_time_slice = 0;
-+ } else if (rq->rq_time_slice >= RESCHED_US)
-+ return;
-+
-+ /* p->time_slice < RESCHED_US. We only modify task_struct under grq lock */
-+ p = rq->curr;
-+ grq_lock();
-+ requeue_task(p);
-+ set_tsk_need_resched(p);
-+ grq_unlock();
-+}
-+
-+/*
-+ * This function gets called by the timer code, with HZ frequency.
-+ * We call it with interrupts disabled. The data modified is all
-+ * local to struct rq so we don't need to grab grq lock.
-+ */
-+void scheduler_tick(void)
-+{
-+ int cpu __maybe_unused = smp_processor_id();
-+ struct rq *rq = cpu_rq(cpu);
-+
-+ sched_clock_tick();
-+ /* grq lock not grabbed, so only update rq clock */
-+ update_rq_clock(rq);
-+ update_cpu_clock_tick(rq, rq->curr);
-+ if (!rq_idle(rq))
-+ task_running_tick(rq);
-+ else
-+ no_iso_tick();
-+ rq->last_tick = rq->clock;
-+ perf_event_task_tick();
-+}
-+
-+notrace unsigned long get_parent_ip(unsigned long addr)
-+{
-+ if (in_lock_functions(addr)) {
-+ addr = CALLER_ADDR2;
-+ if (in_lock_functions(addr))
-+ addr = CALLER_ADDR3;
-+ }
-+ return addr;
-+}
-+
-+#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
-+ defined(CONFIG_PREEMPT_TRACER))
-+void __kprobes add_preempt_count(int val)
-+{
-+#ifdef CONFIG_DEBUG_PREEMPT
-+ /*
-+ * Underflow?
-+ */
-+ if (DEBUG_LOCKS_WARN_ON((preempt_count() < 0)))
-+ return;
-+#endif
-+ preempt_count() += val;
-+#ifdef CONFIG_DEBUG_PREEMPT
-+ /*
-+ * Spinlock count overflowing soon?
-+ */
-+ DEBUG_LOCKS_WARN_ON((preempt_count() & PREEMPT_MASK) >=
-+ PREEMPT_MASK - 10);
-+#endif
-+ if (preempt_count() == val)
-+ trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
-+}
-+EXPORT_SYMBOL(add_preempt_count);
-+
-+void __kprobes sub_preempt_count(int val)
-+{
-+#ifdef CONFIG_DEBUG_PREEMPT
-+ /*
-+ * Underflow?
-+ */
-+ if (DEBUG_LOCKS_WARN_ON(val > preempt_count()))
-+ return;
-+ /*
-+ * Is the spinlock portion underflowing?
-+ */
-+ if (DEBUG_LOCKS_WARN_ON((val < PREEMPT_MASK) &&
-+ !(preempt_count() & PREEMPT_MASK)))
-+ return;
-+#endif
-+
-+ if (preempt_count() == val)
-+ trace_preempt_on(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
-+ preempt_count() -= val;
-+}
-+EXPORT_SYMBOL(sub_preempt_count);
-+#endif
-+
-+/*
-+ * Deadline is "now" in niffies + (offset by priority). Setting the deadline
-+ * is the key to everything. It distributes cpu fairly amongst tasks of the
-+ * same nice value, it proportions cpu according to nice level, it means the
-+ * task that last woke up the longest ago has the earliest deadline, thus
-+ * ensuring that interactive tasks get low latency on wake up. The CPU
-+ * proportion works out to the square of the virtual deadline difference, so
-+ * this equation will give nice 19 3% CPU compared to nice 0.
-+ */
-+static inline u64 prio_deadline_diff(int user_prio)
-+{
-+ return (prio_ratios[user_prio] * rr_interval * (MS_TO_NS(1) / 128));
-+}
-+
-+static inline u64 task_deadline_diff(struct task_struct *p)
-+{
-+ return prio_deadline_diff(TASK_USER_PRIO(p));
-+}
-+
-+static inline u64 static_deadline_diff(int static_prio)
-+{
-+ return prio_deadline_diff(USER_PRIO(static_prio));
-+}
-+
-+static inline int longest_deadline_diff(void)
-+{
-+ return prio_deadline_diff(39);
-+}
-+
-+static inline int ms_longest_deadline_diff(void)
-+{
-+ return NS_TO_MS(longest_deadline_diff());
-+}
-+
-+/*
-+ * The time_slice is only refilled when it is empty and that is when we set a
-+ * new deadline.
-+ */
-+static void time_slice_expired(struct task_struct *p)
-+{
-+ p->time_slice = timeslice();
-+ p->deadline = grq.niffies + task_deadline_diff(p);
-+}
-+
-+/*
-+ * Timeslices below RESCHED_US are considered as good as expired as there's no
-+ * point rescheduling when there's so little time left. SCHED_BATCH tasks
-+ * have been flagged be not latency sensitive and likely to be fully CPU
-+ * bound so every time they're rescheduled they have their time_slice
-+ * refilled, but get a new later deadline to have little effect on
-+ * SCHED_NORMAL tasks.
-+
-+ */
-+static inline void check_deadline(struct task_struct *p)
-+{
-+ if (p->time_slice < RESCHED_US || batch_task(p))
-+ time_slice_expired(p);
-+}
-+
-+#define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
-+
-+/*
-+ * Scheduler queue bitmap specific find next bit.
-+ */
-+static inline unsigned long
-+next_sched_bit(const unsigned long *addr, unsigned long offset)
-+{
-+ const unsigned long *p;
-+ unsigned long result;
-+ unsigned long size;
-+ unsigned long tmp;
-+
-+ size = PRIO_LIMIT;
-+ if (offset >= size)
-+ return size;
-+
-+ p = addr + BITOP_WORD(offset);
-+ result = offset & ~(BITS_PER_LONG-1);
-+ size -= result;
-+ offset %= BITS_PER_LONG;
-+ if (offset) {
-+ tmp = *(p++);
-+ tmp &= (~0UL << offset);
-+ if (size < BITS_PER_LONG)
-+ goto found_first;
-+ if (tmp)
-+ goto found_middle;
-+ size -= BITS_PER_LONG;
-+ result += BITS_PER_LONG;
-+ }
-+ while (size & ~(BITS_PER_LONG-1)) {
-+ if ((tmp = *(p++)))
-+ goto found_middle;
-+ result += BITS_PER_LONG;
-+ size -= BITS_PER_LONG;
-+ }
-+ if (!size)
-+ return result;
-+ tmp = *p;
-+
-+found_first:
-+ tmp &= (~0UL >> (BITS_PER_LONG - size));
-+ if (tmp == 0UL) /* Are any bits set? */
-+ return result + size; /* Nope. */
-+found_middle:
-+ return result + __ffs(tmp);
-+}
-+
-+/*
-+ * O(n) lookup of all tasks in the global runqueue. The real brainfuck
-+ * of lock contention and O(n). It's not really O(n) as only the queued,
-+ * but not running tasks are scanned, and is O(n) queued in the worst case
-+ * scenario only because the right task can be found before scanning all of
-+ * them.
-+ * Tasks are selected in this order:
-+ * Real time tasks are selected purely by their static priority and in the
-+ * order they were queued, so the lowest value idx, and the first queued task
-+ * of that priority value is chosen.
-+ * If no real time tasks are found, the SCHED_ISO priority is checked, and
-+ * all SCHED_ISO tasks have the same priority value, so they're selected by
-+ * the earliest deadline value.
-+ * If no SCHED_ISO tasks are found, SCHED_NORMAL tasks are selected by the
-+ * earliest deadline.
-+ * Finally if no SCHED_NORMAL tasks are found, SCHED_IDLEPRIO tasks are
-+ * selected by the earliest deadline.
-+ */
-+static inline struct
-+task_struct *earliest_deadline_task(struct rq *rq, int cpu, struct task_struct *idle)
-+{
-+ struct task_struct *edt = NULL;
-+ unsigned long idx = -1;
-+
-+ do {
-+ struct list_head *queue;
-+ struct task_struct *p;
-+ u64 earliest_deadline;
-+
-+ idx = next_sched_bit(grq.prio_bitmap, ++idx);
-+ if (idx >= PRIO_LIMIT)
-+ return idle;
-+ queue = grq.queue + idx;
-+
-+ if (idx < MAX_RT_PRIO) {
-+ /* We found an rt task */
-+ list_for_each_entry(p, queue, run_list) {
-+ /* Make sure cpu affinity is ok */
-+ if (needs_other_cpu(p, cpu))
-+ continue;
-+ edt = p;
-+ goto out_take;
-+ }
-+ /*
-+ * None of the RT tasks at this priority can run on
-+ * this cpu
-+ */
-+ continue;
-+ }
-+
-+ /*
-+ * No rt tasks. Find the earliest deadline task. Now we're in
-+ * O(n) territory.
-+ */
-+ earliest_deadline = ~0ULL;
-+ list_for_each_entry(p, queue, run_list) {
-+ u64 dl;
-+
-+ /* Make sure cpu affinity is ok */
-+ if (needs_other_cpu(p, cpu))
-+ continue;
-+
-+ /*
-+ * Soft affinity happens here by not scheduling a task
-+ * with its sticky flag set that ran on a different CPU
-+ * last when the CPU is scaling, or by greatly biasing
-+ * against its deadline when not, based on cpu cache
-+ * locality.
-+ */
-+ if (task_sticky(p) && task_rq(p) != rq) {
-+ if (scaling_rq(rq))
-+ continue;
-+ dl = p->deadline << locality_diff(p, rq);
-+ } else
-+ dl = p->deadline;
-+
-+ if (deadline_before(dl, earliest_deadline)) {
-+ earliest_deadline = dl;
-+ edt = p;
-+ }
-+ }
-+ } while (!edt);
-+
-+out_take:
-+ take_task(cpu, edt);
-+ return edt;
-+}
-+
-+
-+/*
-+ * Print scheduling while atomic bug:
-+ */
-+static noinline void __schedule_bug(struct task_struct *prev)
-+{
-+ if (oops_in_progress)
-+ return;
-+
-+ printk(KERN_ERR "BUG: scheduling while atomic: %s/%d/0x%08x\n",
-+ prev->comm, prev->pid, preempt_count());
-+
-+ debug_show_held_locks(prev);
-+ print_modules();
-+ if (irqs_disabled())
-+ print_irqtrace_events(prev);
-+ dump_stack();
-+ add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
-+}
-+
-+/*
-+ * Various schedule()-time debugging checks and statistics:
-+ */
-+static inline void schedule_debug(struct task_struct *prev)
-+{
-+ /*
-+ * Test if we are atomic. Since do_exit() needs to call into
-+ * schedule() atomically, we ignore that path for now.
-+ * Otherwise, whine if we are scheduling when we should not be.
-+ */
-+ if (unlikely(in_atomic_preempt_off() && !prev->exit_state))
-+ __schedule_bug(prev);
-+ rcu_sleep_check();
-+
-+ profile_hit(SCHED_PROFILING, __builtin_return_address(0));
-+
-+ schedstat_inc(this_rq(), sched_count);
-+}
-+
-+/*
-+ * The currently running task's information is all stored in rq local data
-+ * which is only modified by the local CPU, thereby allowing the data to be
-+ * changed without grabbing the grq lock.
-+ */
-+static inline void set_rq_task(struct rq *rq, struct task_struct *p)
-+{
-+ rq->rq_time_slice = p->time_slice;
-+ rq->rq_deadline = p->deadline;
-+ rq->rq_last_ran = p->last_ran = rq->clock_task;
-+ rq->rq_policy = p->policy;
-+ rq->rq_prio = p->prio;
-+ if (p != rq->idle)
-+ rq->rq_running = true;
-+ else
-+ rq->rq_running = false;
-+}
-+
-+static void reset_rq_task(struct rq *rq, struct task_struct *p)
-+{
-+ rq->rq_policy = p->policy;
-+ rq->rq_prio = p->prio;
-+}
-+
-+/*
-+ * schedule() is the main scheduler function.
-+ *
-+ * The main means of driving the scheduler and thus entering this function are:
-+ *
-+ * 1. Explicit blocking: mutex, semaphore, waitqueue, etc.
-+ *
-+ * 2. TIF_NEED_RESCHED flag is checked on interrupt and userspace return
-+ * paths. For example, see arch/x86/entry_64.S.
-+ *
-+ * To drive preemption between tasks, the scheduler sets the flag in timer
-+ * interrupt handler scheduler_tick().
-+ *
-+ * 3. Wakeups don't really cause entry into schedule(). They add a
-+ * task to the run-queue and that's it.
-+ *
-+ * Now, if the new task added to the run-queue preempts the current
-+ * task, then the wakeup sets TIF_NEED_RESCHED and schedule() gets
-+ * called on the nearest possible occasion:
-+ *
-+ * - If the kernel is preemptible (CONFIG_PREEMPT=y):
-+ *
-+ * - in syscall or exception context, at the next outmost
-+ * preempt_enable(). (this might be as soon as the wake_up()'s
-+ * spin_unlock()!)
-+ *
-+ * - in IRQ context, return from interrupt-handler to
-+ * preemptible context
-+ *
-+ * - If the kernel is not preemptible (CONFIG_PREEMPT is not set)
-+ * then at the next:
-+ *
-+ * - cond_resched() call
-+ * - explicit schedule() call
-+ * - return from syscall or exception to user-space
-+ * - return from interrupt-handler to user-space
-+ */
-+asmlinkage void __sched schedule(void)
-+{
-+ struct task_struct *prev, *next, *idle;
-+ unsigned long *switch_count;
-+ bool deactivate;
-+ struct rq *rq;
-+ int cpu;
-+
-+need_resched:
-+ preempt_disable();
-+ cpu = smp_processor_id();
-+ rq = cpu_rq(cpu);
-+ rcu_note_context_switch(cpu);
-+ prev = rq->curr;
-+
-+ deactivate = false;
-+ schedule_debug(prev);
-+
-+ grq_lock_irq();
-+
-+ switch_count = &prev->nivcsw;
-+ if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
-+ if (unlikely(signal_pending_state(prev->state, prev))) {
-+ prev->state = TASK_RUNNING;
-+ } else {
-+ deactivate = true;
-+ /*
-+ * If a worker is going to sleep, notify and
-+ * ask workqueue whether it wants to wake up a
-+ * task to maintain concurrency. If so, wake
-+ * up the task.
-+ */
-+ if (prev->flags & PF_WQ_WORKER) {
-+ struct task_struct *to_wakeup;
-+
-+ to_wakeup = wq_worker_sleeping(prev, cpu);
-+ if (to_wakeup) {
-+ /* This shouldn't happen, but does */
-+ if (unlikely(to_wakeup == prev))
-+ deactivate = false;
-+ else
-+ try_to_wake_up_local(to_wakeup);
-+ }
-+ }
-+ }
-+ switch_count = &prev->nvcsw;
-+ }
-+
-+ /*
-+ * If we are going to sleep and we have plugged IO queued, make
-+ * sure to submit it to avoid deadlocks.
-+ */
-+ if (unlikely(deactivate && blk_needs_flush_plug(prev))) {
-+ grq_unlock_irq();
-+ preempt_enable_no_resched();
-+ blk_schedule_flush_plug(prev);
-+ goto need_resched;
-+ }
-+
-+ update_clocks(rq);
-+ update_cpu_clock_switch(rq, prev);
-+ if (rq->clock - rq->last_tick > HALF_JIFFY_NS)
-+ rq->dither = false;
-+ else
-+ rq->dither = true;
-+
-+ clear_tsk_need_resched(prev);
-+
-+ idle = rq->idle;
-+ if (idle != prev) {
-+ /* Update all the information stored on struct rq */
-+ prev->time_slice = rq->rq_time_slice;
-+ prev->deadline = rq->rq_deadline;
-+ check_deadline(prev);
-+ prev->last_ran = rq->clock_task;
-+
-+ /* Task changed affinity off this CPU */
-+ if (needs_other_cpu(prev, cpu)) {
-+ if (!deactivate)
-+ resched_suitable_idle(prev);
-+ } else if (!deactivate) {
-+ if (!queued_notrunning()) {
-+ /*
-+ * We now know prev is the only thing that is
-+ * awaiting CPU so we can bypass rechecking for
-+ * the earliest deadline task and just run it
-+ * again.
-+ */
-+ set_rq_task(rq, prev);
-+ grq_unlock_irq();
-+ goto rerun_prev_unlocked;
-+ } else
-+ swap_sticky(rq, cpu, prev);
-+ }
-+ return_task(prev, deactivate);
-+ }
-+
-+ if (unlikely(!queued_notrunning())) {
-+ /*
-+ * This CPU is now truly idle as opposed to when idle is
-+ * scheduled as a high priority task in its own right.
-+ */
-+ next = idle;
-+ schedstat_inc(rq, sched_goidle);
-+ set_cpuidle_map(cpu);
-+ } else {
-+ next = earliest_deadline_task(rq, cpu, idle);
-+ if (likely(next->prio != PRIO_LIMIT))
-+ clear_cpuidle_map(cpu);
-+ else
-+ set_cpuidle_map(cpu);
-+ }
-+
-+ if (likely(prev != next)) {
-+ resched_suitable_idle(prev);
-+ /*
-+ * Don't stick tasks when a real time task is going to run as
-+ * they may literally get stuck.
-+ */
-+ if (rt_task(next))
-+ unstick_task(rq, prev);
-+ set_rq_task(rq, next);
-+ grq.nr_switches++;
-+ prev->on_cpu = false;
-+ next->on_cpu = true;
-+ rq->curr = next;
-+ ++*switch_count;
-+
-+ context_switch(rq, prev, next); /* unlocks the grq */
-+ /*
-+ * The context switch have flipped the stack from under us
-+ * and restored the local variables which were saved when
-+ * this task called schedule() in the past. prev == current
-+ * is still correct, but it can be moved to another cpu/rq.
-+ */
-+ cpu = smp_processor_id();
-+ rq = cpu_rq(cpu);
-+ idle = rq->idle;
-+ } else
-+ grq_unlock_irq();
-+
-+rerun_prev_unlocked:
-+ sched_preempt_enable_no_resched();
-+ if (unlikely(need_resched()))
-+ goto need_resched;
-+}
-+EXPORT_SYMBOL(schedule);
-+
-+#ifdef CONFIG_RCU_USER_QS
-+asmlinkage void __sched schedule_user(void)
-+{
-+ /*
-+ * If we come here after a random call to set_need_resched(),
-+ * or we have been woken up remotely but the IPI has not yet arrived,
-+ * we haven't yet exited the RCU idle mode. Do it here manually until
-+ * we find a better solution.
-+ */
-+ user_exit();
-+ schedule();
-+ user_enter();
-+}
-+#endif
-+
-+/**
-+ * schedule_preempt_disabled - called with preemption disabled
-+ *
-+ * Returns with preemption disabled. Note: preempt_count must be 1
-+ */
-+void __sched schedule_preempt_disabled(void)
-+{
-+ sched_preempt_enable_no_resched();
-+ schedule();
-+ preempt_disable();
-+}
-+
-+#ifdef CONFIG_PREEMPT
-+/*
-+ * this is the entry point to schedule() from in-kernel preemption
-+ * off of preempt_enable. Kernel preemptions off return from interrupt
-+ * occur there and call schedule directly.
-+ */
-+asmlinkage void __sched notrace preempt_schedule(void)
-+{
-+ struct thread_info *ti = current_thread_info();
-+
-+ /*
-+ * If there is a non-zero preempt_count or interrupts are disabled,
-+ * we do not want to preempt the current task. Just return..
-+ */
-+ if (likely(ti->preempt_count || irqs_disabled()))
-+ return;
-+
-+ do {
-+ add_preempt_count_notrace(PREEMPT_ACTIVE);
-+ schedule();
-+ sub_preempt_count_notrace(PREEMPT_ACTIVE);
-+
-+ /*
-+ * Check again in case we missed a preemption opportunity
-+ * between schedule and now.
-+ */
-+ barrier();
-+ } while (need_resched());
-+}
-+EXPORT_SYMBOL(preempt_schedule);
-+
-+/*
-+ * this is the entry point to schedule() from kernel preemption
-+ * off of irq context.
-+ * Note, that this is called and return with irqs disabled. This will
-+ * protect us against recursive calling from irq.
-+ */
-+asmlinkage void __sched preempt_schedule_irq(void)
-+{
-+ struct thread_info *ti = current_thread_info();
-+ enum ctx_state prev_state;
-+
-+ /* Catch callers which need to be fixed */
-+ BUG_ON(ti->preempt_count || !irqs_disabled());
-+
-+ prev_state = exception_enter();
-+
-+ do {
-+ add_preempt_count(PREEMPT_ACTIVE);
-+ local_irq_enable();
-+ schedule();
-+ local_irq_disable();
-+ sub_preempt_count(PREEMPT_ACTIVE);
-+
-+ /*
-+ * Check again in case we missed a preemption opportunity
-+ * between schedule and now.
-+ */
-+ barrier();
-+ } while (need_resched());
-+
-+ exception_exit(prev_state);
-+}
-+
-+#endif /* CONFIG_PREEMPT */
-+
-+int default_wake_function(wait_queue_t *curr, unsigned mode, int wake_flags,
-+ void *key)
-+{
-+ return try_to_wake_up(curr->private, mode, wake_flags);
-+}
-+EXPORT_SYMBOL(default_wake_function);
-+
-+/*
-+ * The core wakeup function. Non-exclusive wakeups (nr_exclusive == 0) just
-+ * wake everything up. If it's an exclusive wakeup (nr_exclusive == small +ve
-+ * number) then we wake all the non-exclusive tasks and one exclusive task.
-+ *
-+ * There are circumstances in which we can try to wake a task which has already
-+ * started to run but is not in state TASK_RUNNING. try_to_wake_up() returns
-+ * zero in this (rare) case, and we handle it by continuing to scan the queue.
-+ */
-+static void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
-+ int nr_exclusive, int wake_flags, void *key)
-+{
-+ struct list_head *tmp, *next;
-+
-+ list_for_each_safe(tmp, next, &q->task_list) {
-+ wait_queue_t *curr = list_entry(tmp, wait_queue_t, task_list);
-+ unsigned int flags = curr->flags;
-+
-+ if (curr->func(curr, mode, wake_flags, key) &&
-+ (flags & WQ_FLAG_EXCLUSIVE) && !--nr_exclusive)
-+ break;
-+ }
-+}
-+
-+/**
-+ * __wake_up - wake up threads blocked on a waitqueue.
-+ * @q: the waitqueue
-+ * @mode: which threads
-+ * @nr_exclusive: how many wake-one or wake-many threads to wake up
-+ * @key: is directly passed to the wakeup function
-+ *
-+ * It may be assumed that this function implies a write memory barrier before
-+ * changing the task state if and only if any tasks are woken up.
-+ */
-+void __wake_up(wait_queue_head_t *q, unsigned int mode,
-+ int nr_exclusive, void *key)
-+{
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&q->lock, flags);
-+ __wake_up_common(q, mode, nr_exclusive, 0, key);
-+ spin_unlock_irqrestore(&q->lock, flags);
-+}
-+EXPORT_SYMBOL(__wake_up);
-+
-+/*
-+ * Same as __wake_up but called with the spinlock in wait_queue_head_t held.
-+ */
-+void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr)
-+{
-+ __wake_up_common(q, mode, nr, 0, NULL);
-+}
-+EXPORT_SYMBOL_GPL(__wake_up_locked);
-+
-+void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key)
-+{
-+ __wake_up_common(q, mode, 1, 0, key);
-+}
-+EXPORT_SYMBOL_GPL(__wake_up_locked_key);
-+
-+/**
-+ * __wake_up_sync_key - wake up threads blocked on a waitqueue.
-+ * @q: the waitqueue
-+ * @mode: which threads
-+ * @nr_exclusive: how many wake-one or wake-many threads to wake up
-+ * @key: opaque value to be passed to wakeup targets
-+ *
-+ * The sync wakeup differs that the waker knows that it will schedule
-+ * away soon, so while the target thread will be woken up, it will not
-+ * be migrated to another CPU - ie. the two threads are 'synchronised'
-+ * with each other. This can prevent needless bouncing between CPUs.
-+ *
-+ * On UP it can prevent extra preemption.
-+ *
-+ * It may be assumed that this function implies a write memory barrier before
-+ * changing the task state if and only if any tasks are woken up.
-+ */
-+void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode,
-+ int nr_exclusive, void *key)
-+{
-+ unsigned long flags;
-+ int wake_flags = WF_SYNC;
-+
-+ if (unlikely(!q))
-+ return;
-+
-+ if (unlikely(!nr_exclusive))
-+ wake_flags = 0;
-+
-+ spin_lock_irqsave(&q->lock, flags);
-+ __wake_up_common(q, mode, nr_exclusive, wake_flags, key);
-+ spin_unlock_irqrestore(&q->lock, flags);
-+}
-+EXPORT_SYMBOL_GPL(__wake_up_sync_key);
-+
-+/**
-+ * __wake_up_sync - wake up threads blocked on a waitqueue.
-+ * @q: the waitqueue
-+ * @mode: which threads
-+ * @nr_exclusive: how many wake-one or wake-many threads to wake up
-+ *
-+ * The sync wakeup differs that the waker knows that it will schedule
-+ * away soon, so while the target thread will be woken up, it will not
-+ * be migrated to another CPU - ie. the two threads are 'synchronised'
-+ * with each other. This can prevent needless bouncing between CPUs.
-+ *
-+ * On UP it can prevent extra preemption.
-+ */
-+void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
-+{
-+ unsigned long flags;
-+ int sync = 1;
-+
-+ if (unlikely(!q))
-+ return;
-+
-+ if (unlikely(!nr_exclusive))
-+ sync = 0;
-+
-+ spin_lock_irqsave(&q->lock, flags);
-+ __wake_up_common(q, mode, nr_exclusive, sync, NULL);
-+ spin_unlock_irqrestore(&q->lock, flags);
-+}
-+EXPORT_SYMBOL_GPL(__wake_up_sync); /* For internal use only */
-+
-+/**
-+ * complete: - signals a single thread waiting on this completion
-+ * @x: holds the state of this particular completion
-+ *
-+ * This will wake up a single thread waiting on this completion. Threads will be
-+ * awakened in the same order in which they were queued.
-+ *
-+ * See also complete_all(), wait_for_completion() and related routines.
-+ *
-+ * It may be assumed that this function implies a write memory barrier before
-+ * changing the task state if and only if any tasks are woken up.
-+ */
-+void complete(struct completion *x)
-+{
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&x->wait.lock, flags);
-+ x->done++;
-+ __wake_up_common(&x->wait, TASK_NORMAL, 1, 0, NULL);
-+ spin_unlock_irqrestore(&x->wait.lock, flags);
-+}
-+EXPORT_SYMBOL(complete);
-+
-+/**
-+ * complete_all: - signals all threads waiting on this completion
-+ * @x: holds the state of this particular completion
-+ *
-+ * This will wake up all threads waiting on this particular completion event.
-+ *
-+ * It may be assumed that this function implies a write memory barrier before
-+ * changing the task state if and only if any tasks are woken up.
-+ */
-+void complete_all(struct completion *x)
-+{
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&x->wait.lock, flags);
-+ x->done += UINT_MAX/2;
-+ __wake_up_common(&x->wait, TASK_NORMAL, 0, 0, NULL);
-+ spin_unlock_irqrestore(&x->wait.lock, flags);
-+}
-+EXPORT_SYMBOL(complete_all);
-+
-+static inline long __sched
-+do_wait_for_common(struct completion *x,
-+ long (*action)(long), long timeout, int state)
-+{
-+ if (!x->done) {
-+ DECLARE_WAITQUEUE(wait, current);
-+
-+ __add_wait_queue_tail_exclusive(&x->wait, &wait);
-+ do {
-+ if (signal_pending_state(state, current)) {
-+ timeout = -ERESTARTSYS;
-+ break;
-+ }
-+ __set_current_state(state);
-+ spin_unlock_irq(&x->wait.lock);
-+ timeout = action(timeout);
-+ spin_lock_irq(&x->wait.lock);
-+ } while (!x->done && timeout);
-+ __remove_wait_queue(&x->wait, &wait);
-+ if (!x->done)
-+ return timeout;
-+ }
-+ x->done--;
-+ return timeout ?: 1;
-+}
-+
-+static inline long __sched
-+__wait_for_common(struct completion *x,
-+ long (*action)(long), long timeout, int state)
-+{
-+ might_sleep();
-+
-+ spin_lock_irq(&x->wait.lock);
-+ timeout = do_wait_for_common(x, action, timeout, state);
-+ spin_unlock_irq(&x->wait.lock);
-+ return timeout;
-+}
-+
-+static long __sched
-+wait_for_common(struct completion *x, long timeout, int state)
-+{
-+ return __wait_for_common(x, schedule_timeout, timeout, state);
-+}
-+
-+static long __sched
-+wait_for_common_io(struct completion *x, long timeout, int state)
-+{
-+ return __wait_for_common(x, io_schedule_timeout, timeout, state);
-+}
-+
-+/**
-+ * wait_for_completion: - waits for completion of a task
-+ * @x: holds the state of this particular completion
-+ *
-+ * This waits to be signaled for completion of a specific task. It is NOT
-+ * interruptible and there is no timeout.
-+ *
-+ * See also similar routines (i.e. wait_for_completion_timeout()) with timeout
-+ * and interrupt capability. Also see complete().
-+ */
-+void __sched wait_for_completion(struct completion *x)
-+{
-+ wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_UNINTERRUPTIBLE);
-+}
-+EXPORT_SYMBOL(wait_for_completion);
-+
-+/**
-+ * wait_for_completion_timeout: - waits for completion of a task (w/timeout)
-+ * @x: holds the state of this particular completion
-+ * @timeout: timeout value in jiffies
-+ *
-+ * This waits for either a completion of a specific task to be signaled or for a
-+ * specified timeout to expire. The timeout is in jiffies. It is not
-+ * interruptible.
-+ *
-+ * The return value is 0 if timed out, and positive (at least 1, or number of
-+ * jiffies left till timeout) if completed.
-+ */
-+unsigned long __sched
-+wait_for_completion_timeout(struct completion *x, unsigned long timeout)
-+{
-+ return wait_for_common(x, timeout, TASK_UNINTERRUPTIBLE);
-+}
-+EXPORT_SYMBOL(wait_for_completion_timeout);
-+
-+ /**
-+ * wait_for_completion_io: - waits for completion of a task
-+ * @x: holds the state of this particular completion
-+ *
-+ * This waits to be signaled for completion of a specific task. It is NOT
-+ * interruptible and there is no timeout. The caller is accounted as waiting
-+ * for IO.
-+ */
-+void __sched wait_for_completion_io(struct completion *x)
-+{
-+ wait_for_common_io(x, MAX_SCHEDULE_TIMEOUT, TASK_UNINTERRUPTIBLE);
-+}
-+EXPORT_SYMBOL(wait_for_completion_io);
-+
-+/**
-+ * wait_for_completion_io_timeout: - waits for completion of a task (w/timeout)
-+ * @x: holds the state of this particular completion
-+ * @timeout: timeout value in jiffies
-+ *
-+ * This waits for either a completion of a specific task to be signaled or for a
-+ * specified timeout to expire. The timeout is in jiffies. It is not
-+ * interruptible. The caller is accounted as waiting for IO.
-+ *
-+ * The return value is 0 if timed out, and positive (at least 1, or number of
-+ * jiffies left till timeout) if completed.
-+ */
-+unsigned long __sched
-+wait_for_completion_io_timeout(struct completion *x, unsigned long timeout)
-+{
-+ return wait_for_common_io(x, timeout, TASK_UNINTERRUPTIBLE);
-+}
-+EXPORT_SYMBOL(wait_for_completion_io_timeout);
-+
-+/**
-+ * wait_for_completion_interruptible: - waits for completion of a task (w/intr)
-+ * @x: holds the state of this particular completion
-+ *
-+ * This waits for completion of a specific task to be signaled. It is
-+ * interruptible.
-+ *
-+ * The return value is -ERESTARTSYS if interrupted, 0 if completed.
-+ */
-+int __sched wait_for_completion_interruptible(struct completion *x)
-+{
-+ long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_INTERRUPTIBLE);
-+ if (t == -ERESTARTSYS)
-+ return t;
-+ return 0;
-+}
-+EXPORT_SYMBOL(wait_for_completion_interruptible);
-+
-+/**
-+ * wait_for_completion_interruptible_timeout: - waits for completion (w/(to,intr))
-+ * @x: holds the state of this particular completion
-+ * @timeout: timeout value in jiffies
-+ *
-+ * This waits for either a completion of a specific task to be signaled or for a
-+ * specified timeout to expire. It is interruptible. The timeout is in jiffies.
-+ *
-+ * The return value is -ERESTARTSYS if interrupted, 0 if timed out,
-+ * positive (at least 1, or number of jiffies left till timeout) if completed.
-+ */
-+long __sched
-+wait_for_completion_interruptible_timeout(struct completion *x,
-+ unsigned long timeout)
-+{
-+ return wait_for_common(x, timeout, TASK_INTERRUPTIBLE);
-+}
-+EXPORT_SYMBOL(wait_for_completion_interruptible_timeout);
-+
-+/**
-+ * wait_for_completion_killable: - waits for completion of a task (killable)
-+ * @x: holds the state of this particular completion
-+ *
-+ * This waits to be signaled for completion of a specific task. It can be
-+ * interrupted by a kill signal.
-+ *
-+ * The return value is -ERESTARTSYS if interrupted, 0 if timed out,
-+ * positive (at least 1, or number of jiffies left till timeout) if completed.
-+ */
-+int __sched wait_for_completion_killable(struct completion *x)
-+{
-+ long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_KILLABLE);
-+ if (t == -ERESTARTSYS)
-+ return t;
-+ return 0;
-+}
-+EXPORT_SYMBOL(wait_for_completion_killable);
-+
-+/**
-+ * wait_for_completion_killable_timeout: - waits for completion of a task (w/(to,killable))
-+ * @x: holds the state of this particular completion
-+ * @timeout: timeout value in jiffies
-+ *
-+ * This waits for either a completion of a specific task to be
-+ * signaled or for a specified timeout to expire. It can be
-+ * interrupted by a kill signal. The timeout is in jiffies.
-+ */
-+long __sched
-+wait_for_completion_killable_timeout(struct completion *x,
-+ unsigned long timeout)
-+{
-+ return wait_for_common(x, timeout, TASK_KILLABLE);
-+}
-+EXPORT_SYMBOL(wait_for_completion_killable_timeout);
-+
-+/**
-+ * try_wait_for_completion - try to decrement a completion without blocking
-+ * @x: completion structure
-+ *
-+ * Returns: 0 if a decrement cannot be done without blocking
-+ * 1 if a decrement succeeded.
-+ *
-+ * If a completion is being used as a counting completion,
-+ * attempt to decrement the counter without blocking. This
-+ * enables us to avoid waiting if the resource the completion
-+ * is protecting is not available.
-+ */
-+bool try_wait_for_completion(struct completion *x)
-+{
-+ unsigned long flags;
-+ int ret = 1;
-+
-+ spin_lock_irqsave(&x->wait.lock, flags);
-+ if (!x->done)
-+ ret = 0;
-+ else
-+ x->done--;
-+ spin_unlock_irqrestore(&x->wait.lock, flags);
-+ return ret;
-+}
-+EXPORT_SYMBOL(try_wait_for_completion);
-+
-+/**
-+ * completion_done - Test to see if a completion has any waiters
-+ * @x: completion structure
-+ *
-+ * Returns: 0 if there are waiters (wait_for_completion() in progress)
-+ * 1 if there are no waiters.
-+ *
-+ */
-+bool completion_done(struct completion *x)
-+{
-+ unsigned long flags;
-+ int ret = 1;
-+
-+ spin_lock_irqsave(&x->wait.lock, flags);
-+ if (!x->done)
-+ ret = 0;
-+ spin_unlock_irqrestore(&x->wait.lock, flags);
-+ return ret;
-+}
-+EXPORT_SYMBOL(completion_done);
-+
-+static long __sched
-+sleep_on_common(wait_queue_head_t *q, int state, long timeout)
-+{
-+ unsigned long flags;
-+ wait_queue_t wait;
-+
-+ init_waitqueue_entry(&wait, current);
-+
-+ __set_current_state(state);
-+
-+ spin_lock_irqsave(&q->lock, flags);
-+ __add_wait_queue(q, &wait);
-+ spin_unlock(&q->lock);
-+ timeout = schedule_timeout(timeout);
-+ spin_lock_irq(&q->lock);
-+ __remove_wait_queue(q, &wait);
-+ spin_unlock_irqrestore(&q->lock, flags);
-+
-+ return timeout;
-+}
-+
-+void __sched interruptible_sleep_on(wait_queue_head_t *q)
-+{
-+ sleep_on_common(q, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
-+}
-+EXPORT_SYMBOL(interruptible_sleep_on);
-+
-+long __sched
-+interruptible_sleep_on_timeout(wait_queue_head_t *q, long timeout)
-+{
-+ return sleep_on_common(q, TASK_INTERRUPTIBLE, timeout);
-+}
-+EXPORT_SYMBOL(interruptible_sleep_on_timeout);
-+
-+void __sched sleep_on(wait_queue_head_t *q)
-+{
-+ sleep_on_common(q, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
-+}
-+EXPORT_SYMBOL(sleep_on);
-+
-+long __sched sleep_on_timeout(wait_queue_head_t *q, long timeout)
-+{
-+ return sleep_on_common(q, TASK_UNINTERRUPTIBLE, timeout);
-+}
-+EXPORT_SYMBOL(sleep_on_timeout);
-+
-+#ifdef CONFIG_RT_MUTEXES
-+
-+/*
-+ * rt_mutex_setprio - set the current priority of a task
-+ * @p: task
-+ * @prio: prio value (kernel-internal form)
-+ *
-+ * This function changes the 'effective' priority of a task. It does
-+ * not touch ->normal_prio like __setscheduler().
-+ *
-+ * Used by the rt_mutex code to implement priority inheritance logic.
-+ */
-+void rt_mutex_setprio(struct task_struct *p, int prio)
-+{
-+ unsigned long flags;
-+ int queued, oldprio;
-+ struct rq *rq;
-+
-+ BUG_ON(prio < 0 || prio > MAX_PRIO);
-+
-+ rq = task_grq_lock(p, &flags);
-+
-+ /*
-+ * Idle task boosting is a nono in general. There is one
-+ * exception, when PREEMPT_RT and NOHZ is active:
-+ *
-+ * The idle task calls get_next_timer_interrupt() and holds
-+ * the timer wheel base->lock on the CPU and another CPU wants
-+ * to access the timer (probably to cancel it). We can safely
-+ * ignore the boosting request, as the idle CPU runs this code
-+ * with interrupts disabled and will complete the lock
-+ * protected section without being interrupted. So there is no
-+ * real need to boost.
-+ */
-+ if (unlikely(p == rq->idle)) {
-+ WARN_ON(p != rq->curr);
-+ WARN_ON(p->pi_blocked_on);
-+ goto out_unlock;
-+ }
-+
-+ trace_sched_pi_setprio(p, prio);
-+ oldprio = p->prio;
-+ queued = task_queued(p);
-+ if (queued)
-+ dequeue_task(p);
-+ p->prio = prio;
-+ if (task_running(p) && prio > oldprio)
-+ resched_task(p);
-+ if (queued) {
-+ enqueue_task(p);
-+ try_preempt(p, rq);
-+ }
-+
-+out_unlock:
-+ task_grq_unlock(&flags);
-+}
-+
-+#endif
-+
-+/*
-+ * Adjust the deadline for when the priority is to change, before it's
-+ * changed.
-+ */
-+static inline void adjust_deadline(struct task_struct *p, int new_prio)
-+{
-+ p->deadline += static_deadline_diff(new_prio) - task_deadline_diff(p);
-+}
-+
-+void set_user_nice(struct task_struct *p, long nice)
-+{
-+ int queued, new_static, old_static;
-+ unsigned long flags;
-+ struct rq *rq;
-+
-+ if (TASK_NICE(p) == nice || nice < -20 || nice > 19)
-+ return;
-+ new_static = NICE_TO_PRIO(nice);
-+ /*
-+ * We have to be careful, if called from sys_setpriority(),
-+ * the task might be in the middle of scheduling on another CPU.
-+ */
-+ rq = time_task_grq_lock(p, &flags);
-+ /*
-+ * The RT priorities are set via sched_setscheduler(), but we still
-+ * allow the 'normal' nice value to be set - but as expected
-+ * it wont have any effect on scheduling until the task is
-+ * not SCHED_NORMAL/SCHED_BATCH:
-+ */
-+ if (has_rt_policy(p)) {
-+ p->static_prio = new_static;
-+ goto out_unlock;
-+ }
-+ queued = task_queued(p);
-+ if (queued)
-+ dequeue_task(p);
-+
-+ adjust_deadline(p, new_static);
-+ old_static = p->static_prio;
-+ p->static_prio = new_static;
-+ p->prio = effective_prio(p);
-+
-+ if (queued) {
-+ enqueue_task(p);
-+ if (new_static < old_static)
-+ try_preempt(p, rq);
-+ } else if (task_running(p)) {
-+ reset_rq_task(rq, p);
-+ if (old_static < new_static)
-+ resched_task(p);
-+ }
-+out_unlock:
-+ task_grq_unlock(&flags);
-+}
-+EXPORT_SYMBOL(set_user_nice);
-+
-+/*
-+ * can_nice - check if a task can reduce its nice value
-+ * @p: task
-+ * @nice: nice value
-+ */
-+int can_nice(const struct task_struct *p, const int nice)
-+{
-+ /* convert nice value [19,-20] to rlimit style value [1,40] */
-+ int nice_rlim = 20 - nice;
-+
-+ return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) ||
-+ capable(CAP_SYS_NICE));
-+}
-+
-+#ifdef __ARCH_WANT_SYS_NICE
-+
-+/*
-+ * sys_nice - change the priority of the current process.
-+ * @increment: priority increment
-+ *
-+ * sys_setpriority is a more generic, but much slower function that
-+ * does similar things.
-+ */
-+SYSCALL_DEFINE1(nice, int, increment)
-+{
-+ long nice, retval;
-+
-+ /*
-+ * Setpriority might change our priority at the same moment.
-+ * We don't have to worry. Conceptually one call occurs first
-+ * and we have a single winner.
-+ */
-+ if (increment < -40)
-+ increment = -40;
-+ if (increment > 40)
-+ increment = 40;
-+
-+ nice = TASK_NICE(current) + increment;
-+ if (nice < -20)
-+ nice = -20;
-+ if (nice > 19)
-+ nice = 19;
-+
-+ if (increment < 0 && !can_nice(current, nice))
-+ return -EPERM;
-+
-+ retval = security_task_setnice(current, nice);
-+ if (retval)
-+ return retval;
-+
-+ set_user_nice(current, nice);
-+ return 0;
-+}
-+
-+#endif
-+
-+/**
-+ * task_prio - return the priority value of a given task.
-+ * @p: the task in question.
-+ *
-+ * This is the priority value as seen by users in /proc.
-+ * RT tasks are offset by -100. Normal tasks are centered around 1, value goes
-+ * from 0 (SCHED_ISO) up to 82 (nice +19 SCHED_IDLEPRIO).
-+ */
-+int task_prio(const struct task_struct *p)
-+{
-+ int delta, prio = p->prio - MAX_RT_PRIO;
-+
-+ /* rt tasks and iso tasks */
-+ if (prio <= 0)
-+ goto out;
-+
-+ /* Convert to ms to avoid overflows */
-+ delta = NS_TO_MS(p->deadline - grq.niffies);
-+ delta = delta * 40 / ms_longest_deadline_diff();
-+ if (delta > 0 && delta <= 80)
-+ prio += delta;
-+ if (idleprio_task(p))
-+ prio += 40;
-+out:
-+ return prio;
-+}
-+
-+/**
-+ * task_nice - return the nice value of a given task.
-+ * @p: the task in question.
-+ */
-+int task_nice(const struct task_struct *p)
-+{
-+ return TASK_NICE(p);
-+}
-+EXPORT_SYMBOL_GPL(task_nice);
-+
-+/**
-+ * idle_cpu - is a given cpu idle currently?
-+ * @cpu: the processor in question.
-+ */
-+int idle_cpu(int cpu)
-+{
-+ return cpu_curr(cpu) == cpu_rq(cpu)->idle;
-+}
-+
-+/**
-+ * idle_task - return the idle task for a given cpu.
-+ * @cpu: the processor in question.
-+ */
-+struct task_struct *idle_task(int cpu)
-+{
-+ return cpu_rq(cpu)->idle;
-+}
-+
-+/**
-+ * find_process_by_pid - find a process with a matching PID value.
-+ * @pid: the pid in question.
-+ */
-+static inline struct task_struct *find_process_by_pid(pid_t pid)
-+{
-+ return pid ? find_task_by_vpid(pid) : current;
-+}
-+
-+/* Actually do priority change: must hold grq lock. */
-+static void
-+__setscheduler(struct task_struct *p, struct rq *rq, int policy, int prio)
-+{
-+ int oldrtprio, oldprio;
-+
-+ p->policy = policy;
-+ oldrtprio = p->rt_priority;
-+ p->rt_priority = prio;
-+ p->normal_prio = normal_prio(p);
-+ oldprio = p->prio;
-+ /* we are holding p->pi_lock already */
-+ p->prio = rt_mutex_getprio(p);
-+ if (task_running(p)) {
-+ reset_rq_task(rq, p);
-+ /* Resched only if we might now be preempted */
-+ if (p->prio > oldprio || p->rt_priority > oldrtprio)
-+ resched_task(p);
-+ }
-+}
-+
-+/*
-+ * check the target process has a UID that matches the current process's
-+ */
-+static bool check_same_owner(struct task_struct *p)
-+{
-+ const struct cred *cred = current_cred(), *pcred;
-+ bool match;
-+
-+ rcu_read_lock();
-+ pcred = __task_cred(p);
-+ match = (uid_eq(cred->euid, pcred->euid) ||
-+ uid_eq(cred->euid, pcred->uid));
-+ rcu_read_unlock();
-+ return match;
-+}
-+
-+static int __sched_setscheduler(struct task_struct *p, int policy,
-+ const struct sched_param *param, bool user)
-+{
-+ struct sched_param zero_param = { .sched_priority = 0 };
-+ int queued, retval, oldpolicy = -1;
-+ unsigned long flags, rlim_rtprio = 0;
-+ int reset_on_fork;
-+ struct rq *rq;
-+
-+ /* may grab non-irq protected spin_locks */
-+ BUG_ON(in_interrupt());
-+
-+ if (is_rt_policy(policy) && !capable(CAP_SYS_NICE)) {
-+ unsigned long lflags;
-+
-+ if (!lock_task_sighand(p, &lflags))
-+ return -ESRCH;
-+ rlim_rtprio = task_rlimit(p, RLIMIT_RTPRIO);
-+ unlock_task_sighand(p, &lflags);
-+ if (rlim_rtprio)
-+ goto recheck;
-+ /*
-+ * If the caller requested an RT policy without having the
-+ * necessary rights, we downgrade the policy to SCHED_ISO.
-+ * We also set the parameter to zero to pass the checks.
-+ */
-+ policy = SCHED_ISO;
-+ param = &zero_param;
-+ }
-+recheck:
-+ /* double check policy once rq lock held */
-+ if (policy < 0) {
-+ reset_on_fork = p->sched_reset_on_fork;
-+ policy = oldpolicy = p->policy;
-+ } else {
-+ reset_on_fork = !!(policy & SCHED_RESET_ON_FORK);
-+ policy &= ~SCHED_RESET_ON_FORK;
-+
-+ if (!SCHED_RANGE(policy))
-+ return -EINVAL;
-+ }
-+
-+ /*
-+ * Valid priorities for SCHED_FIFO and SCHED_RR are
-+ * 1..MAX_USER_RT_PRIO-1, valid priority for SCHED_NORMAL and
-+ * SCHED_BATCH is 0.
-+ */
-+ if (param->sched_priority < 0 ||
-+ (p->mm && param->sched_priority > MAX_USER_RT_PRIO - 1) ||
-+ (!p->mm && param->sched_priority > MAX_RT_PRIO - 1))
-+ return -EINVAL;
-+ if (is_rt_policy(policy) != (param->sched_priority != 0))
-+ return -EINVAL;
-+
-+ /*
-+ * Allow unprivileged RT tasks to decrease priority:
-+ */
-+ if (user && !capable(CAP_SYS_NICE)) {
-+ if (is_rt_policy(policy)) {
-+ unsigned long rlim_rtprio =
-+ task_rlimit(p, RLIMIT_RTPRIO);
-+
-+ /* can't set/change the rt policy */
-+ if (policy != p->policy && !rlim_rtprio)
-+ return -EPERM;
-+
-+ /* can't increase priority */
-+ if (param->sched_priority > p->rt_priority &&
-+ param->sched_priority > rlim_rtprio)
-+ return -EPERM;
-+ } else {
-+ switch (p->policy) {
-+ /*
-+ * Can only downgrade policies but not back to
-+ * SCHED_NORMAL
-+ */
-+ case SCHED_ISO:
-+ if (policy == SCHED_ISO)
-+ goto out;
-+ if (policy == SCHED_NORMAL)
-+ return -EPERM;
-+ break;
-+ case SCHED_BATCH:
-+ if (policy == SCHED_BATCH)
-+ goto out;
-+ if (policy != SCHED_IDLEPRIO)
-+ return -EPERM;
-+ break;
-+ case SCHED_IDLEPRIO:
-+ if (policy == SCHED_IDLEPRIO)
-+ goto out;
-+ return -EPERM;
-+ default:
-+ break;
-+ }
-+ }
-+
-+ /* can't change other user's priorities */
-+ if (!check_same_owner(p))
-+ return -EPERM;
-+
-+ /* Normal users shall not reset the sched_reset_on_fork flag */
-+ if (p->sched_reset_on_fork && !reset_on_fork)
-+ return -EPERM;
-+ }
-+
-+ if (user) {
-+ retval = security_task_setscheduler(p);
-+ if (retval)
-+ return retval;
-+ }
-+
-+ /*
-+ * make sure no PI-waiters arrive (or leave) while we are
-+ * changing the priority of the task:
-+ */
-+ raw_spin_lock_irqsave(&p->pi_lock, flags);
-+ /*
-+ * To be able to change p->policy safely, the grunqueue lock must be
-+ * held.
-+ */
-+ rq = __task_grq_lock(p);
-+
-+ /*
-+ * Changing the policy of the stop threads its a very bad idea
-+ */
-+ if (p == rq->stop) {
-+ __task_grq_unlock();
-+ raw_spin_unlock_irqrestore(&p->pi_lock, flags);
-+ return -EINVAL;
-+ }
-+
-+ /*
-+ * If not changing anything there's no need to proceed further:
-+ */
-+ if (unlikely(policy == p->policy && (!is_rt_policy(policy) ||
-+ param->sched_priority == p->rt_priority))) {
-+
-+ __task_grq_unlock();
-+ raw_spin_unlock_irqrestore(&p->pi_lock, flags);
-+ return 0;
-+ }
-+
-+ /* recheck policy now with rq lock held */
-+ if (unlikely(oldpolicy != -1 && oldpolicy != p->policy)) {
-+ policy = oldpolicy = -1;
-+ __task_grq_unlock();
-+ raw_spin_unlock_irqrestore(&p->pi_lock, flags);
-+ goto recheck;
-+ }
-+ update_clocks(rq);
-+ p->sched_reset_on_fork = reset_on_fork;
-+
-+ queued = task_queued(p);
-+ if (queued)
-+ dequeue_task(p);
-+ __setscheduler(p, rq, policy, param->sched_priority);
-+ if (queued) {
-+ enqueue_task(p);
-+ try_preempt(p, rq);
-+ }
-+ __task_grq_unlock();
-+ raw_spin_unlock_irqrestore(&p->pi_lock, flags);
-+
-+ rt_mutex_adjust_pi(p);
-+out:
-+ return 0;
-+}
-+
-+/**
-+ * sched_setscheduler - change the scheduling policy and/or RT priority of a thread.
-+ * @p: the task in question.
-+ * @policy: new policy.
-+ * @param: structure containing the new RT priority.
-+ *
-+ * NOTE that the task may be already dead.
-+ */
-+int sched_setscheduler(struct task_struct *p, int policy,
-+ const struct sched_param *param)
-+{
-+ return __sched_setscheduler(p, policy, param, true);
-+}
-+
-+EXPORT_SYMBOL_GPL(sched_setscheduler);
-+
-+/**
-+ * sched_setscheduler_nocheck - change the scheduling policy and/or RT priority of a thread from kernelspace.
-+ * @p: the task in question.
-+ * @policy: new policy.
-+ * @param: structure containing the new RT priority.
-+ *
-+ * Just like sched_setscheduler, only don't bother checking if the
-+ * current context has permission. For example, this is needed in
-+ * stop_machine(): we create temporary high priority worker threads,
-+ * but our caller might not have that capability.
-+ */
-+int sched_setscheduler_nocheck(struct task_struct *p, int policy,
-+ const struct sched_param *param)
-+{
-+ return __sched_setscheduler(p, policy, param, false);
-+}
-+
-+static int
-+do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param)
-+{
-+ struct sched_param lparam;
-+ struct task_struct *p;
-+ int retval;
-+
-+ if (!param || pid < 0)
-+ return -EINVAL;
-+ if (copy_from_user(&lparam, param, sizeof(struct sched_param)))
-+ return -EFAULT;
-+
-+ rcu_read_lock();
-+ retval = -ESRCH;
-+ p = find_process_by_pid(pid);
-+ if (p != NULL)
-+ retval = sched_setscheduler(p, policy, &lparam);
-+ rcu_read_unlock();
-+
-+ return retval;
-+}
-+
-+/**
-+ * sys_sched_setscheduler - set/change the scheduler policy and RT priority
-+ * @pid: the pid in question.
-+ * @policy: new policy.
-+ * @param: structure containing the new RT priority.
-+ */
-+asmlinkage long sys_sched_setscheduler(pid_t pid, int policy,
-+ struct sched_param __user *param)
-+{
-+ /* negative values for policy are not valid */
-+ if (policy < 0)
-+ return -EINVAL;
-+
-+ return do_sched_setscheduler(pid, policy, param);
-+}
-+
-+/**
-+ * sys_sched_setparam - set/change the RT priority of a thread
-+ * @pid: the pid in question.
-+ * @param: structure containing the new RT priority.
-+ */
-+SYSCALL_DEFINE2(sched_setparam, pid_t, pid, struct sched_param __user *, param)
-+{
-+ return do_sched_setscheduler(pid, -1, param);
-+}
-+
-+/**
-+ * sys_sched_getscheduler - get the policy (scheduling class) of a thread
-+ * @pid: the pid in question.
-+ */
-+SYSCALL_DEFINE1(sched_getscheduler, pid_t, pid)
-+{
-+ struct task_struct *p;
-+ int retval = -EINVAL;
-+
-+ if (pid < 0)
-+ goto out_nounlock;
-+
-+ retval = -ESRCH;
-+ rcu_read_lock();
-+ p = find_process_by_pid(pid);
-+ if (p) {
-+ retval = security_task_getscheduler(p);
-+ if (!retval)
-+ retval = p->policy;
-+ }
-+ rcu_read_unlock();
-+
-+out_nounlock:
-+ return retval;
-+}
-+
-+/**
-+ * sys_sched_getscheduler - get the RT priority of a thread
-+ * @pid: the pid in question.
-+ * @param: structure containing the RT priority.
-+ */
-+SYSCALL_DEFINE2(sched_getparam, pid_t, pid, struct sched_param __user *, param)
-+{
-+ struct sched_param lp;
-+ struct task_struct *p;
-+ int retval = -EINVAL;
-+
-+ if (!param || pid < 0)
-+ goto out_nounlock;
-+
-+ rcu_read_lock();
-+ p = find_process_by_pid(pid);
-+ retval = -ESRCH;
-+ if (!p)
-+ goto out_unlock;
-+
-+ retval = security_task_getscheduler(p);
-+ if (retval)
-+ goto out_unlock;
-+
-+ lp.sched_priority = p->rt_priority;
-+ rcu_read_unlock();
-+
-+ /*
-+ * This one might sleep, we cannot do it with a spinlock held ...
-+ */
-+ retval = copy_to_user(param, &lp, sizeof(*param)) ? -EFAULT : 0;
-+
-+out_nounlock:
-+ return retval;
-+
-+out_unlock:
-+ rcu_read_unlock();
-+ return retval;
-+}
-+
-+long sched_setaffinity(pid_t pid, const struct cpumask *in_mask)
-+{
-+ cpumask_var_t cpus_allowed, new_mask;
-+ struct task_struct *p;
-+ int retval;
-+
-+ get_online_cpus();
-+ rcu_read_lock();
-+
-+ p = find_process_by_pid(pid);
-+ if (!p) {
-+ rcu_read_unlock();
-+ put_online_cpus();
-+ return -ESRCH;
-+ }
-+
-+ /* Prevent p going away */
-+ get_task_struct(p);
-+ rcu_read_unlock();
-+
-+ if (p->flags & PF_NO_SETAFFINITY) {
-+ retval = -EINVAL;
-+ goto out_put_task;
-+ }
-+ if (!alloc_cpumask_var(&cpus_allowed, GFP_KERNEL)) {
-+ retval = -ENOMEM;
-+ goto out_put_task;
-+ }
-+ if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) {
-+ retval = -ENOMEM;
-+ goto out_free_cpus_allowed;
-+ }
-+ retval = -EPERM;
-+ if (!check_same_owner(p)) {
-+ rcu_read_lock();
-+ if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) {
-+ rcu_read_unlock();
-+ goto out_unlock;
-+ }
-+ rcu_read_unlock();
-+ }
-+
-+ retval = security_task_setscheduler(p);
-+ if (retval)
-+ goto out_unlock;
-+
-+ cpuset_cpus_allowed(p, cpus_allowed);
-+ cpumask_and(new_mask, in_mask, cpus_allowed);
-+again:
-+ retval = set_cpus_allowed_ptr(p, new_mask);
-+
-+ if (!retval) {
-+ cpuset_cpus_allowed(p, cpus_allowed);
-+ if (!cpumask_subset(new_mask, cpus_allowed)) {
-+ /*
-+ * We must have raced with a concurrent cpuset
-+ * update. Just reset the cpus_allowed to the
-+ * cpuset's cpus_allowed
-+ */
-+ cpumask_copy(new_mask, cpus_allowed);
-+ goto again;
-+ }
-+ }
-+out_unlock:
-+ free_cpumask_var(new_mask);
-+out_free_cpus_allowed:
-+ free_cpumask_var(cpus_allowed);
-+out_put_task:
-+ put_task_struct(p);
-+ put_online_cpus();
-+ return retval;
-+}
-+
-+static int get_user_cpu_mask(unsigned long __user *user_mask_ptr, unsigned len,
-+ cpumask_t *new_mask)
-+{
-+ if (len < sizeof(cpumask_t)) {
-+ memset(new_mask, 0, sizeof(cpumask_t));
-+ } else if (len > sizeof(cpumask_t)) {
-+ len = sizeof(cpumask_t);
-+ }
-+ return copy_from_user(new_mask, user_mask_ptr, len) ? -EFAULT : 0;
-+}
-+
-+
-+/**
-+ * sys_sched_setaffinity - set the cpu affinity of a process
-+ * @pid: pid of the process
-+ * @len: length in bytes of the bitmask pointed to by user_mask_ptr
-+ * @user_mask_ptr: user-space pointer to the new cpu mask
-+ */
-+SYSCALL_DEFINE3(sched_setaffinity, pid_t, pid, unsigned int, len,
-+ unsigned long __user *, user_mask_ptr)
-+{
-+ cpumask_var_t new_mask;
-+ int retval;
-+
-+ if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
-+ return -ENOMEM;
-+
-+ retval = get_user_cpu_mask(user_mask_ptr, len, new_mask);
-+ if (retval == 0)
-+ retval = sched_setaffinity(pid, new_mask);
-+ free_cpumask_var(new_mask);
-+ return retval;
-+}
-+
-+long sched_getaffinity(pid_t pid, cpumask_t *mask)
-+{
-+ struct task_struct *p;
-+ unsigned long flags;
-+ int retval;
-+
-+ get_online_cpus();
-+ rcu_read_lock();
-+
-+ retval = -ESRCH;
-+ p = find_process_by_pid(pid);
-+ if (!p)
-+ goto out_unlock;
-+
-+ retval = security_task_getscheduler(p);
-+ if (retval)
-+ goto out_unlock;
-+
-+ grq_lock_irqsave(&flags);
-+ cpumask_and(mask, tsk_cpus_allowed(p), cpu_online_mask);
-+ grq_unlock_irqrestore(&flags);
-+
-+out_unlock:
-+ rcu_read_unlock();
-+ put_online_cpus();
-+
-+ return retval;
-+}
-+
-+/**
-+ * sys_sched_getaffinity - get the cpu affinity of a process
-+ * @pid: pid of the process
-+ * @len: length in bytes of the bitmask pointed to by user_mask_ptr
-+ * @user_mask_ptr: user-space pointer to hold the current cpu mask
-+ */
-+SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
-+ unsigned long __user *, user_mask_ptr)
-+{
-+ int ret;
-+ cpumask_var_t mask;
-+
-+ if ((len * BITS_PER_BYTE) < nr_cpu_ids)
-+ return -EINVAL;
-+ if (len & (sizeof(unsigned long)-1))
-+ return -EINVAL;
-+
-+ if (!alloc_cpumask_var(&mask, GFP_KERNEL))
-+ return -ENOMEM;
-+
-+ ret = sched_getaffinity(pid, mask);
-+ if (ret == 0) {
-+ size_t retlen = min_t(size_t, len, cpumask_size());
-+
-+ if (copy_to_user(user_mask_ptr, mask, retlen))
-+ ret = -EFAULT;
-+ else
-+ ret = retlen;
-+ }
-+ free_cpumask_var(mask);
-+
-+ return ret;
-+}
-+
-+/**
-+ * sys_sched_yield - yield the current processor to other threads.
-+ *
-+ * This function yields the current CPU to other tasks. It does this by
-+ * scheduling away the current task. If it still has the earliest deadline
-+ * it will be scheduled again as the next task.
-+ */
-+SYSCALL_DEFINE0(sched_yield)
-+{
-+ struct task_struct *p;
-+
-+ p = current;
-+ grq_lock_irq();
-+ schedstat_inc(task_rq(p), yld_count);
-+ requeue_task(p);
-+
-+ /*
-+ * Since we are going to call schedule() anyway, there's
-+ * no need to preempt or enable interrupts:
-+ */
-+ __release(grq.lock);
-+ spin_release(&grq.lock.dep_map, 1, _THIS_IP_);
-+ do_raw_spin_unlock(&grq.lock);
-+ sched_preempt_enable_no_resched();
-+
-+ schedule();
-+
-+ return 0;
-+}
-+
-+static inline bool should_resched(void)
-+{
-+ return need_resched() && !(preempt_count() & PREEMPT_ACTIVE);
-+}
-+
-+static void __cond_resched(void)
-+{
-+ add_preempt_count(PREEMPT_ACTIVE);
-+ schedule();
-+ sub_preempt_count(PREEMPT_ACTIVE);
-+}
-+
-+int __sched _cond_resched(void)
-+{
-+ if (should_resched()) {
-+ __cond_resched();
-+ return 1;
-+ }
-+ return 0;
-+}
-+EXPORT_SYMBOL(_cond_resched);
-+
-+/*
-+ * __cond_resched_lock() - if a reschedule is pending, drop the given lock,
-+ * call schedule, and on return reacquire the lock.
-+ *
-+ * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
-+ * operations here to prevent schedule() from being called twice (once via
-+ * spin_unlock(), once by hand).
-+ */
-+int __cond_resched_lock(spinlock_t *lock)
-+{
-+ int resched = should_resched();
-+ int ret = 0;
-+
-+ lockdep_assert_held(lock);
-+
-+ if (spin_needbreak(lock) || resched) {
-+ spin_unlock(lock);
-+ if (resched)
-+ __cond_resched();
-+ else
-+ cpu_relax();
-+ ret = 1;
-+ spin_lock(lock);
-+ }
-+ return ret;
-+}
-+EXPORT_SYMBOL(__cond_resched_lock);
-+
-+int __sched __cond_resched_softirq(void)
-+{
-+ BUG_ON(!in_softirq());
-+
-+ if (should_resched()) {
-+ local_bh_enable();
-+ __cond_resched();
-+ local_bh_disable();
-+ return 1;
-+ }
-+ return 0;
-+}
-+EXPORT_SYMBOL(__cond_resched_softirq);
-+
-+/**
-+ * yield - yield the current processor to other threads.
-+ *
-+ * Do not ever use this function, there's a 99% chance you're doing it wrong.
-+ *
-+ * The scheduler is at all times free to pick the calling task as the most
-+ * eligible task to run, if removing the yield() call from your code breaks
-+ * it, its already broken.
-+ *
-+ * Typical broken usage is:
-+ *
-+ * while (!event)
-+ * yield();
-+ *
-+ * where one assumes that yield() will let 'the other' process run that will
-+ * make event true. If the current task is a SCHED_FIFO task that will never
-+ * happen. Never use yield() as a progress guarantee!!
-+ *
-+ * If you want to use yield() to wait for something, use wait_event().
-+ * If you want to use yield() to be 'nice' for others, use cond_resched().
-+ * If you still want to use yield(), do not!
-+ */
-+void __sched yield(void)
-+{
-+ set_current_state(TASK_RUNNING);
-+ sys_sched_yield();
-+}
-+EXPORT_SYMBOL(yield);
-+
-+/**
-+ * yield_to - yield the current processor to another thread in
-+ * your thread group, or accelerate that thread toward the
-+ * processor it's on.
-+ * @p: target task
-+ * @preempt: whether task preemption is allowed or not
-+ *
-+ * It's the caller's job to ensure that the target task struct
-+ * can't go away on us before we can do any checks.
-+ *
-+ * Returns:
-+ * true (>0) if we indeed boosted the target task.
-+ * false (0) if we failed to boost the target.
-+ * -ESRCH if there's no task to yield to.
-+ */
-+bool __sched yield_to(struct task_struct *p, bool preempt)
-+{
-+ unsigned long flags;
-+ int yielded = 0;
-+ struct rq *rq;
-+
-+ rq = this_rq();
-+ grq_lock_irqsave(&flags);
-+ if (task_running(p) || p->state) {
-+ yielded = -ESRCH;
-+ goto out_unlock;
-+ }
-+ yielded = 1;
-+ if (p->deadline > rq->rq_deadline)
-+ p->deadline = rq->rq_deadline;
-+ p->time_slice += rq->rq_time_slice;
-+ rq->rq_time_slice = 0;
-+ if (p->time_slice > timeslice())
-+ p->time_slice = timeslice();
-+ set_tsk_need_resched(rq->curr);
-+out_unlock:
-+ grq_unlock_irqrestore(&flags);
-+
-+ if (yielded > 0)
-+ schedule();
-+ return yielded;
-+}
-+EXPORT_SYMBOL_GPL(yield_to);
-+
-+/*
-+ * This task is about to go to sleep on IO. Increment rq->nr_iowait so
-+ * that process accounting knows that this is a task in IO wait state.
-+ *
-+ * But don't do that if it is a deliberate, throttling IO wait (this task
-+ * has set its backing_dev_info: the queue against which it should throttle)
-+ */
-+void __sched io_schedule(void)
-+{
-+ struct rq *rq = raw_rq();
-+
-+ delayacct_blkio_start();
-+ atomic_inc(&rq->nr_iowait);
-+ blk_flush_plug(current);
-+ current->in_iowait = 1;
-+ schedule();
-+ current->in_iowait = 0;
-+ atomic_dec(&rq->nr_iowait);
-+ delayacct_blkio_end();
-+}
-+EXPORT_SYMBOL(io_schedule);
-+
-+long __sched io_schedule_timeout(long timeout)
-+{
-+ struct rq *rq = raw_rq();
-+ long ret;
-+
-+ delayacct_blkio_start();
-+ atomic_inc(&rq->nr_iowait);
-+ blk_flush_plug(current);
-+ current->in_iowait = 1;
-+ ret = schedule_timeout(timeout);
-+ current->in_iowait = 0;
-+ atomic_dec(&rq->nr_iowait);
-+ delayacct_blkio_end();
-+ return ret;
-+}
-+
-+/**
-+ * sys_sched_get_priority_max - return maximum RT priority.
-+ * @policy: scheduling class.
-+ *
-+ * this syscall returns the maximum rt_priority that can be used
-+ * by a given scheduling class.
-+ */
-+SYSCALL_DEFINE1(sched_get_priority_max, int, policy)
-+{
-+ int ret = -EINVAL;
-+
-+ switch (policy) {
-+ case SCHED_FIFO:
-+ case SCHED_RR:
-+ ret = MAX_USER_RT_PRIO-1;
-+ break;
-+ case SCHED_NORMAL:
-+ case SCHED_BATCH:
-+ case SCHED_ISO:
-+ case SCHED_IDLEPRIO:
-+ ret = 0;
-+ break;
-+ }
-+ return ret;
-+}
-+
-+/**
-+ * sys_sched_get_priority_min - return minimum RT priority.
-+ * @policy: scheduling class.
-+ *
-+ * this syscall returns the minimum rt_priority that can be used
-+ * by a given scheduling class.
-+ */
-+SYSCALL_DEFINE1(sched_get_priority_min, int, policy)
-+{
-+ int ret = -EINVAL;
-+
-+ switch (policy) {
-+ case SCHED_FIFO:
-+ case SCHED_RR:
-+ ret = 1;
-+ break;
-+ case SCHED_NORMAL:
-+ case SCHED_BATCH:
-+ case SCHED_ISO:
-+ case SCHED_IDLEPRIO:
-+ ret = 0;
-+ break;
-+ }
-+ return ret;
-+}
-+
-+/**
-+ * sys_sched_rr_get_interval - return the default timeslice of a process.
-+ * @pid: pid of the process.
-+ * @interval: userspace pointer to the timeslice value.
-+ *
-+ * this syscall writes the default timeslice value of a given process
-+ * into the user-space timespec buffer. A value of '0' means infinity.
-+ */
-+SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid,
-+ struct timespec __user *, interval)
-+{
-+ struct task_struct *p;
-+ unsigned int time_slice;
-+ unsigned long flags;
-+ int retval;
-+ struct timespec t;
-+
-+ if (pid < 0)
-+ return -EINVAL;
-+
-+ retval = -ESRCH;
-+ rcu_read_lock();
-+ p = find_process_by_pid(pid);
-+ if (!p)
-+ goto out_unlock;
-+
-+ retval = security_task_getscheduler(p);
-+ if (retval)
-+ goto out_unlock;
-+
-+ grq_lock_irqsave(&flags);
-+ time_slice = p->policy == SCHED_FIFO ? 0 : MS_TO_NS(task_timeslice(p));
-+ grq_unlock_irqrestore(&flags);
-+
-+ rcu_read_unlock();
-+ t = ns_to_timespec(time_slice);
-+ retval = copy_to_user(interval, &t, sizeof(t)) ? -EFAULT : 0;
-+ return retval;
-+
-+out_unlock:
-+ rcu_read_unlock();
-+ return retval;
-+}
-+
-+static const char stat_nam[] = TASK_STATE_TO_CHAR_STR;
-+
-+void sched_show_task(struct task_struct *p)
-+{
-+ unsigned long free = 0;
-+ int ppid;
-+ unsigned state;
-+
-+ state = p->state ? __ffs(p->state) + 1 : 0;
-+ printk(KERN_INFO "%-15.15s %c", p->comm,
-+ state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?');
-+#if BITS_PER_LONG == 32
-+ if (state == TASK_RUNNING)
-+ printk(KERN_CONT " running ");
-+ else
-+ printk(KERN_CONT " %08lx ", thread_saved_pc(p));
-+#else
-+ if (state == TASK_RUNNING)
-+ printk(KERN_CONT " running task ");
-+ else
-+ printk(KERN_CONT " %016lx ", thread_saved_pc(p));
-+#endif
-+#ifdef CONFIG_DEBUG_STACK_USAGE
-+ free = stack_not_used(p);
-+#endif
-+ rcu_read_lock();
-+ ppid = task_pid_nr(rcu_dereference(p->real_parent));
-+ rcu_read_unlock();
-+ printk(KERN_CONT "%5lu %5d %6d 0x%08lx\n", free,
-+ task_pid_nr(p), ppid,
-+ (unsigned long)task_thread_info(p)->flags);
-+
-+ print_worker_info(KERN_INFO, p);
-+ show_stack(p, NULL);
-+}
-+
-+void show_state_filter(unsigned long state_filter)
-+{
-+ struct task_struct *g, *p;
-+
-+#if BITS_PER_LONG == 32
-+ printk(KERN_INFO
-+ " task PC stack pid father\n");
-+#else
-+ printk(KERN_INFO
-+ " task PC stack pid father\n");
-+#endif
-+ rcu_read_lock();
-+ do_each_thread(g, p) {
-+ /*
-+ * reset the NMI-timeout, listing all files on a slow
-+ * console might take a lot of time:
-+ */
-+ touch_nmi_watchdog();
-+ if (!state_filter || (p->state & state_filter))
-+ sched_show_task(p);
-+ } while_each_thread(g, p);
-+
-+ touch_all_softlockup_watchdogs();
-+
-+ rcu_read_unlock();
-+ /*
-+ * Only show locks if all tasks are dumped:
-+ */
-+ if (!state_filter)
-+ debug_show_all_locks();
-+}
-+
-+void dump_cpu_task(int cpu)
-+{
-+ pr_info("Task dump for CPU %d:\n", cpu);
-+ sched_show_task(cpu_curr(cpu));
-+}
-+
-+#ifdef CONFIG_SMP
-+void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
-+{
-+ cpumask_copy(tsk_cpus_allowed(p), new_mask);
-+}
-+#endif
-+
-+/**
-+ * init_idle - set up an idle thread for a given CPU
-+ * @idle: task in question
-+ * @cpu: cpu the idle task belongs to
-+ *
-+ * NOTE: this function does not set the idle thread's NEED_RESCHED
-+ * flag, to make booting more robust.
-+ */
-+void init_idle(struct task_struct *idle, int cpu)
-+{
-+ struct rq *rq = cpu_rq(cpu);
-+ unsigned long flags;
-+
-+ time_grq_lock(rq, &flags);
-+ idle->last_ran = rq->clock_task;
-+ idle->state = TASK_RUNNING;
-+ /* Setting prio to illegal value shouldn't matter when never queued */
-+ idle->prio = PRIO_LIMIT;
-+ set_rq_task(rq, idle);
-+ do_set_cpus_allowed(idle, &cpumask_of_cpu(cpu));
-+ /* Silence PROVE_RCU */
-+ rcu_read_lock();
-+ set_task_cpu(idle, cpu);
-+ rcu_read_unlock();
-+ rq->curr = rq->idle = idle;
-+ idle->on_cpu = 1;
-+ grq_unlock_irqrestore(&flags);
-+
-+ /* Set the preempt count _outside_ the spinlocks! */
-+ task_thread_info(idle)->preempt_count = 0;
-+
-+ ftrace_graph_init_idle_task(idle, cpu);
-+#if defined(CONFIG_SMP)
-+ sprintf(idle->comm, "%s/%d", INIT_TASK_COMM, cpu);
-+#endif
-+}
-+
-+#ifdef CONFIG_SMP
-+#ifdef CONFIG_NO_HZ_COMMON
-+void nohz_balance_enter_idle(int cpu)
-+{
-+}
-+
-+void select_nohz_load_balancer(int stop_tick)
-+{
-+}
-+
-+void set_cpu_sd_state_idle(void) {}
-+#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-+/**
-+ * lowest_flag_domain - Return lowest sched_domain containing flag.
-+ * @cpu: The cpu whose lowest level of sched domain is to
-+ * be returned.
-+ * @flag: The flag to check for the lowest sched_domain
-+ * for the given cpu.
-+ *
-+ * Returns the lowest sched_domain of a cpu which contains the given flag.
-+ */
-+static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
-+{
-+ struct sched_domain *sd;
-+
-+ for_each_domain(cpu, sd)
-+ if (sd && (sd->flags & flag))
-+ break;
-+
-+ return sd;
-+}
-+
-+/**
-+ * for_each_flag_domain - Iterates over sched_domains containing the flag.
-+ * @cpu: The cpu whose domains we're iterating over.
-+ * @sd: variable holding the value of the power_savings_sd
-+ * for cpu.
-+ * @flag: The flag to filter the sched_domains to be iterated.
-+ *
-+ * Iterates over all the scheduler domains for a given cpu that has the 'flag'
-+ * set, starting from the lowest sched_domain to the highest.
-+ */
-+#define for_each_flag_domain(cpu, sd, flag) \
-+ for (sd = lowest_flag_domain(cpu, flag); \
-+ (sd && (sd->flags & flag)); sd = sd->parent)
-+
-+#endif /* (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
-+
-+static inline void resched_cpu(int cpu)
-+{
-+ unsigned long flags;
-+
-+ grq_lock_irqsave(&flags);
-+ resched_task(cpu_curr(cpu));
-+ grq_unlock_irqrestore(&flags);
-+}
-+
-+/*
-+ * In the semi idle case, use the nearest busy cpu for migrating timers
-+ * from an idle cpu. This is good for power-savings.
-+ *
-+ * We don't do similar optimization for completely idle system, as
-+ * selecting an idle cpu will add more delays to the timers than intended
-+ * (as that cpu's timer base may not be uptodate wrt jiffies etc).
-+ */
-+int get_nohz_timer_target(void)
-+{
-+ int cpu = smp_processor_id();
-+ int i;
-+ struct sched_domain *sd;
-+
-+ rcu_read_lock();
-+ for_each_domain(cpu, sd) {
-+ for_each_cpu(i, sched_domain_span(sd)) {
-+ if (!idle_cpu(i))
-+ cpu = i;
-+ goto unlock;
-+ }
-+ }
-+unlock:
-+ rcu_read_unlock();
-+ return cpu;
-+}
-+
-+/*
-+ * When add_timer_on() enqueues a timer into the timer wheel of an
-+ * idle CPU then this timer might expire before the next timer event
-+ * which is scheduled to wake up that CPU. In case of a completely
-+ * idle system the next event might even be infinite time into the
-+ * future. wake_up_idle_cpu() ensures that the CPU is woken up and
-+ * leaves the inner idle loop so the newly added timer is taken into
-+ * account when the CPU goes back to idle and evaluates the timer
-+ * wheel for the next timer event.
-+ */
-+void wake_up_idle_cpu(int cpu)
-+{
-+ struct task_struct *idle;
-+ struct rq *rq;
-+
-+ if (cpu == smp_processor_id())
-+ return;
-+
-+ rq = cpu_rq(cpu);
-+ idle = rq->idle;
-+
-+ /*
-+ * This is safe, as this function is called with the timer
-+ * wheel base lock of (cpu) held. When the CPU is on the way
-+ * to idle and has not yet set rq->curr to idle then it will
-+ * be serialised on the timer wheel base lock and take the new
-+ * timer into account automatically.
-+ */
-+ if (unlikely(rq->curr != idle))
-+ return;
-+
-+ /*
-+ * We can set TIF_RESCHED on the idle task of the other CPU
-+ * lockless. The worst case is that the other CPU runs the
-+ * idle task through an additional NOOP schedule()
-+ */
-+ set_tsk_need_resched(idle);
-+
-+ /* NEED_RESCHED must be visible before we test polling */
-+ smp_mb();
-+ if (!tsk_is_polling(idle))
-+ smp_send_reschedule(cpu);
-+}
-+
-+void wake_up_nohz_cpu(int cpu)
-+{
-+ wake_up_idle_cpu(cpu);
-+}
-+#endif /* CONFIG_NO_HZ_COMMON */
-+
-+/*
-+ * Change a given task's CPU affinity. Migrate the thread to a
-+ * proper CPU and schedule it away if the CPU it's executing on
-+ * is removed from the allowed bitmask.
-+ *
-+ * NOTE: the caller must have a valid reference to the task, the
-+ * task must not exit() & deallocate itself prematurely. The
-+ * call is not atomic; no spinlocks may be held.
-+ */
-+int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
-+{
-+ bool running_wrong = false;
-+ bool queued = false;
-+ unsigned long flags;
-+ struct rq *rq;
-+ int ret = 0;
-+
-+ rq = task_grq_lock(p, &flags);
-+
-+ if (cpumask_equal(tsk_cpus_allowed(p), new_mask))
-+ goto out;
-+
-+ if (!cpumask_intersects(new_mask, cpu_active_mask)) {
-+ ret = -EINVAL;
-+ goto out;
-+ }
-+
-+ queued = task_queued(p);
-+
-+ do_set_cpus_allowed(p, new_mask);
-+
-+ /* Can the task run on the task's current CPU? If so, we're done */
-+ if (cpumask_test_cpu(task_cpu(p), new_mask))
-+ goto out;
-+
-+ if (task_running(p)) {
-+ /* Task is running on the wrong cpu now, reschedule it. */
-+ if (rq == this_rq()) {
-+ set_tsk_need_resched(p);
-+ running_wrong = true;
-+ } else
-+ resched_task(p);
-+ } else
-+ set_task_cpu(p, cpumask_any_and(cpu_active_mask, new_mask));
-+
-+out:
-+ if (queued)
-+ try_preempt(p, rq);
-+ task_grq_unlock(&flags);
-+
-+ if (running_wrong)
-+ _cond_resched();
-+
-+ return ret;
-+}
-+EXPORT_SYMBOL_GPL(set_cpus_allowed_ptr);
-+
-+#ifdef CONFIG_HOTPLUG_CPU
-+extern struct task_struct *cpu_stopper_task;
-+/* Run through task list and find tasks affined to just the dead cpu, then
-+ * allocate a new affinity */
-+static void break_sole_affinity(int src_cpu, struct task_struct *idle)
-+{
-+ struct task_struct *p, *t, *stopper;
-+
-+ stopper = per_cpu(cpu_stopper_task, src_cpu);
-+ do_each_thread(t, p) {
-+ if (p != stopper && p != idle && !online_cpus(p)) {
-+ cpumask_copy(tsk_cpus_allowed(p), cpu_possible_mask);
-+ /*
-+ * Don't tell them about moving exiting tasks or
-+ * kernel threads (both mm NULL), since they never
-+ * leave kernel.
-+ */
-+ if (p->mm && printk_ratelimit()) {
-+ printk(KERN_INFO "process %d (%s) no "
-+ "longer affine to cpu %d\n",
-+ task_pid_nr(p), p->comm, src_cpu);
-+ }
-+ }
-+ clear_sticky(p);
-+ } while_each_thread(t, p);
-+}
-+
-+/*
-+ * Ensures that the idle task is using init_mm right before its cpu goes
-+ * offline.
-+ */
-+void idle_task_exit(void)
-+{
-+ struct mm_struct *mm = current->active_mm;
-+
-+ BUG_ON(cpu_online(smp_processor_id()));
-+
-+ if (mm != &init_mm)
-+ switch_mm(mm, &init_mm, current);
-+ mmdrop(mm);
-+}
-+#endif /* CONFIG_HOTPLUG_CPU */
-+void sched_set_stop_task(int cpu, struct task_struct *stop)
-+{
-+ struct sched_param stop_param = { .sched_priority = STOP_PRIO };
-+ struct sched_param start_param = { .sched_priority = 0 };
-+ struct task_struct *old_stop = cpu_rq(cpu)->stop;
-+
-+ if (stop) {
-+ /*
-+ * Make it appear like a SCHED_FIFO task, its something
-+ * userspace knows about and won't get confused about.
-+ *
-+ * Also, it will make PI more or less work without too
-+ * much confusion -- but then, stop work should not
-+ * rely on PI working anyway.
-+ */
-+ sched_setscheduler_nocheck(stop, SCHED_FIFO, &stop_param);
-+ }
-+
-+ cpu_rq(cpu)->stop = stop;
-+
-+ if (old_stop) {
-+ /*
-+ * Reset it back to a normal scheduling policy so that
-+ * it can die in pieces.
-+ */
-+ sched_setscheduler_nocheck(old_stop, SCHED_NORMAL, &start_param);
-+ }
-+}
-+
-+
-+#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL)
-+
-+static struct ctl_table sd_ctl_dir[] = {
-+ {
-+ .procname = "sched_domain",
-+ .mode = 0555,
-+ },
-+ {}
-+};
-+
-+static struct ctl_table sd_ctl_root[] = {
-+ {
-+ .procname = "kernel",
-+ .mode = 0555,
-+ .child = sd_ctl_dir,
-+ },
-+ {}
-+};
-+
-+static struct ctl_table *sd_alloc_ctl_entry(int n)
-+{
-+ struct ctl_table *entry =
-+ kcalloc(n, sizeof(struct ctl_table), GFP_KERNEL);
-+
-+ return entry;
-+}
-+
-+static void sd_free_ctl_entry(struct ctl_table **tablep)
-+{
-+ struct ctl_table *entry;
-+
-+ /*
-+ * In the intermediate directories, both the child directory and
-+ * procname are dynamically allocated and could fail but the mode
-+ * will always be set. In the lowest directory the names are
-+ * static strings and all have proc handlers.
-+ */
-+ for (entry = *tablep; entry->mode; entry++) {
-+ if (entry->child)
-+ sd_free_ctl_entry(&entry->child);
-+ if (entry->proc_handler == NULL)
-+ kfree(entry->procname);
-+ }
-+
-+ kfree(*tablep);
-+ *tablep = NULL;
-+}
-+
-+static void
-+set_table_entry(struct ctl_table *entry,
-+ const char *procname, void *data, int maxlen,
-+ mode_t mode, proc_handler *proc_handler)
-+{
-+ entry->procname = procname;
-+ entry->data = data;
-+ entry->maxlen = maxlen;
-+ entry->mode = mode;
-+ entry->proc_handler = proc_handler;
-+}
-+
-+static struct ctl_table *
-+sd_alloc_ctl_domain_table(struct sched_domain *sd)
-+{
-+ struct ctl_table *table = sd_alloc_ctl_entry(13);
-+
-+ if (table == NULL)
-+ return NULL;
-+
-+ set_table_entry(&table[0], "min_interval", &sd->min_interval,
-+ sizeof(long), 0644, proc_doulongvec_minmax);
-+ set_table_entry(&table[1], "max_interval", &sd->max_interval,
-+ sizeof(long), 0644, proc_doulongvec_minmax);
-+ set_table_entry(&table[2], "busy_idx", &sd->busy_idx,
-+ sizeof(int), 0644, proc_dointvec_minmax);
-+ set_table_entry(&table[3], "idle_idx", &sd->idle_idx,
-+ sizeof(int), 0644, proc_dointvec_minmax);
-+ set_table_entry(&table[4], "newidle_idx", &sd->newidle_idx,
-+ sizeof(int), 0644, proc_dointvec_minmax);
-+ set_table_entry(&table[5], "wake_idx", &sd->wake_idx,
-+ sizeof(int), 0644, proc_dointvec_minmax);
-+ set_table_entry(&table[6], "forkexec_idx", &sd->forkexec_idx,
-+ sizeof(int), 0644, proc_dointvec_minmax);
-+ set_table_entry(&table[7], "busy_factor", &sd->busy_factor,
-+ sizeof(int), 0644, proc_dointvec_minmax);
-+ set_table_entry(&table[8], "imbalance_pct", &sd->imbalance_pct,
-+ sizeof(int), 0644, proc_dointvec_minmax);
-+ set_table_entry(&table[9], "cache_nice_tries",
-+ &sd->cache_nice_tries,
-+ sizeof(int), 0644, proc_dointvec_minmax);
-+ set_table_entry(&table[10], "flags", &sd->flags,
-+ sizeof(int), 0644, proc_dointvec_minmax);
-+ set_table_entry(&table[11], "name", sd->name,
-+ CORENAME_MAX_SIZE, 0444, proc_dostring);
-+ /* &table[12] is terminator */
-+
-+ return table;
-+}
-+
-+static ctl_table *sd_alloc_ctl_cpu_table(int cpu)
-+{
-+ struct ctl_table *entry, *table;
-+ struct sched_domain *sd;
-+ int domain_num = 0, i;
-+ char buf[32];
-+
-+ for_each_domain(cpu, sd)
-+ domain_num++;
-+ entry = table = sd_alloc_ctl_entry(domain_num + 1);
-+ if (table == NULL)
-+ return NULL;
-+
-+ i = 0;
-+ for_each_domain(cpu, sd) {
-+ snprintf(buf, 32, "domain%d", i);
-+ entry->procname = kstrdup(buf, GFP_KERNEL);
-+ entry->mode = 0555;
-+ entry->child = sd_alloc_ctl_domain_table(sd);
-+ entry++;
-+ i++;
-+ }
-+ return table;
-+}
-+
-+static struct ctl_table_header *sd_sysctl_header;
-+static void register_sched_domain_sysctl(void)
-+{
-+ int i, cpu_num = num_possible_cpus();
-+ struct ctl_table *entry = sd_alloc_ctl_entry(cpu_num + 1);
-+ char buf[32];
-+
-+ WARN_ON(sd_ctl_dir[0].child);
-+ sd_ctl_dir[0].child = entry;
-+
-+ if (entry == NULL)
-+ return;
-+
-+ for_each_possible_cpu(i) {
-+ snprintf(buf, 32, "cpu%d", i);
-+ entry->procname = kstrdup(buf, GFP_KERNEL);
-+ entry->mode = 0555;
-+ entry->child = sd_alloc_ctl_cpu_table(i);
-+ entry++;
-+ }
-+
-+ WARN_ON(sd_sysctl_header);
-+ sd_sysctl_header = register_sysctl_table(sd_ctl_root);
-+}
-+
-+/* may be called multiple times per register */
-+static void unregister_sched_domain_sysctl(void)
-+{
-+ if (sd_sysctl_header)
-+ unregister_sysctl_table(sd_sysctl_header);
-+ sd_sysctl_header = NULL;
-+ if (sd_ctl_dir[0].child)
-+ sd_free_ctl_entry(&sd_ctl_dir[0].child);
-+}
-+#else
-+static void register_sched_domain_sysctl(void)
-+{
-+}
-+static void unregister_sched_domain_sysctl(void)
-+{
-+}
-+#endif
-+
-+static void set_rq_online(struct rq *rq)
-+{
-+ if (!rq->online) {
-+ cpumask_set_cpu(cpu_of(rq), rq->rd->online);
-+ rq->online = true;
-+ }
-+}
-+
-+static void set_rq_offline(struct rq *rq)
-+{
-+ if (rq->online) {
-+ cpumask_clear_cpu(cpu_of(rq), rq->rd->online);
-+ rq->online = false;
-+ }
-+}
-+
-+/*
-+ * migration_call - callback that gets triggered when a CPU is added.
-+ */
-+static int __cpuinit
-+migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
-+{
-+ int cpu = (long)hcpu;
-+ unsigned long flags;
-+ struct rq *rq = cpu_rq(cpu);
-+#ifdef CONFIG_HOTPLUG_CPU
-+ struct task_struct *idle = rq->idle;
-+#endif
-+
-+ switch (action & ~CPU_TASKS_FROZEN) {
-+
-+ case CPU_UP_PREPARE:
-+ break;
-+
-+ case CPU_ONLINE:
-+ /* Update our root-domain */
-+ grq_lock_irqsave(&flags);
-+ if (rq->rd) {
-+ BUG_ON(!cpumask_test_cpu(cpu, rq->rd->span));
-+
-+ set_rq_online(rq);
-+ }
-+ grq.noc = num_online_cpus();
-+ grq_unlock_irqrestore(&flags);
-+ break;
-+
-+#ifdef CONFIG_HOTPLUG_CPU
-+ case CPU_DEAD:
-+ /* Idle task back to normal (off runqueue, low prio) */
-+ grq_lock_irq();
-+ return_task(idle, true);
-+ idle->static_prio = MAX_PRIO;
-+ __setscheduler(idle, rq, SCHED_NORMAL, 0);
-+ idle->prio = PRIO_LIMIT;
-+ set_rq_task(rq, idle);
-+ update_clocks(rq);
-+ grq_unlock_irq();
-+ break;
-+
-+ case CPU_DYING:
-+ /* Update our root-domain */
-+ grq_lock_irqsave(&flags);
-+ if (rq->rd) {
-+ BUG_ON(!cpumask_test_cpu(cpu, rq->rd->span));
-+ set_rq_offline(rq);
-+ }
-+ break_sole_affinity(cpu, idle);
-+ grq.noc = num_online_cpus();
-+ grq_unlock_irqrestore(&flags);
-+ break;
-+#endif
-+ }
-+ return NOTIFY_OK;
-+}
-+
-+/*
-+ * Register at high priority so that task migration (migrate_all_tasks)
-+ * happens before everything else. This has to be lower priority than
-+ * the notifier in the perf_counter subsystem, though.
-+ */
-+static struct notifier_block __cpuinitdata migration_notifier = {
-+ .notifier_call = migration_call,
-+ .priority = CPU_PRI_MIGRATION,
-+};
-+
-+static int __cpuinit sched_cpu_active(struct notifier_block *nfb,
-+ unsigned long action, void *hcpu)
-+{
-+ switch (action & ~CPU_TASKS_FROZEN) {
-+ case CPU_STARTING:
-+ case CPU_DOWN_FAILED:
-+ set_cpu_active((long)hcpu, true);
-+ return NOTIFY_OK;
-+ default:
-+ return NOTIFY_DONE;
-+ }
-+}
-+
-+static int __cpuinit sched_cpu_inactive(struct notifier_block *nfb,
-+ unsigned long action, void *hcpu)
-+{
-+ switch (action & ~CPU_TASKS_FROZEN) {
-+ case CPU_DOWN_PREPARE:
-+ set_cpu_active((long)hcpu, false);
-+ return NOTIFY_OK;
-+ default:
-+ return NOTIFY_DONE;
-+ }
-+}
-+
-+int __init migration_init(void)
-+{
-+ void *cpu = (void *)(long)smp_processor_id();
-+ int err;
-+
-+ /* Initialise migration for the boot CPU */
-+ err = migration_call(&migration_notifier, CPU_UP_PREPARE, cpu);
-+ BUG_ON(err == NOTIFY_BAD);
-+ migration_call(&migration_notifier, CPU_ONLINE, cpu);
-+ register_cpu_notifier(&migration_notifier);
-+
-+ /* Register cpu active notifiers */
-+ cpu_notifier(sched_cpu_active, CPU_PRI_SCHED_ACTIVE);
-+ cpu_notifier(sched_cpu_inactive, CPU_PRI_SCHED_INACTIVE);
-+
-+ return 0;
-+}
-+early_initcall(migration_init);
-+#endif
-+
-+#ifdef CONFIG_SMP
-+
-+static cpumask_var_t sched_domains_tmpmask; /* sched_domains_mutex */
-+
-+#ifdef CONFIG_SCHED_DEBUG
-+
-+static __read_mostly int sched_debug_enabled;
-+
-+static int __init sched_debug_setup(char *str)
-+{
-+ sched_debug_enabled = 1;
-+
-+ return 0;
-+}
-+early_param("sched_debug", sched_debug_setup);
-+
-+static inline bool sched_debug(void)
-+{
-+ return sched_debug_enabled;
-+}
-+
-+static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
-+ struct cpumask *groupmask)
-+{
-+ char str[256];
-+
-+ cpulist_scnprintf(str, sizeof(str), sched_domain_span(sd));
-+ cpumask_clear(groupmask);
-+
-+ printk(KERN_DEBUG "%*s domain %d: ", level, "", level);
-+
-+ if (!(sd->flags & SD_LOAD_BALANCE)) {
-+ printk("does not load-balance\n");
-+ if (sd->parent)
-+ printk(KERN_ERR "ERROR: !SD_LOAD_BALANCE domain"
-+ " has parent");
-+ return -1;
-+ }
-+
-+ printk(KERN_CONT "span %s level %s\n", str, sd->name);
-+
-+ if (!cpumask_test_cpu(cpu, sched_domain_span(sd))) {
-+ printk(KERN_ERR "ERROR: domain->span does not contain "
-+ "CPU%d\n", cpu);
-+ }
-+
-+ printk(KERN_CONT "\n");
-+
-+ if (!cpumask_equal(sched_domain_span(sd), groupmask))
-+ printk(KERN_ERR "ERROR: groups don't span domain->span\n");
-+
-+ if (sd->parent &&
-+ !cpumask_subset(groupmask, sched_domain_span(sd->parent)))
-+ printk(KERN_ERR "ERROR: parent span is not a superset "
-+ "of domain->span\n");
-+ return 0;
-+}
-+
-+static void sched_domain_debug(struct sched_domain *sd, int cpu)
-+{
-+ int level = 0;
-+
-+ if (!sched_debug_enabled)
-+ return;
-+
-+ if (!sd) {
-+ printk(KERN_DEBUG "CPU%d attaching NULL sched-domain.\n", cpu);
-+ return;
-+ }
-+
-+ printk(KERN_DEBUG "CPU%d attaching sched-domain:\n", cpu);
-+
-+ for (;;) {
-+ if (sched_domain_debug_one(sd, cpu, level, sched_domains_tmpmask))
-+ break;
-+ level++;
-+ sd = sd->parent;
-+ if (!sd)
-+ break;
-+ }
-+}
-+#else /* !CONFIG_SCHED_DEBUG */
-+# define sched_domain_debug(sd, cpu) do { } while (0)
-+static inline bool sched_debug(void)
-+{
-+ return false;
-+}
-+#endif /* CONFIG_SCHED_DEBUG */
-+
-+static int sd_degenerate(struct sched_domain *sd)
-+{
-+ if (cpumask_weight(sched_domain_span(sd)) == 1)
-+ return 1;
-+
-+ /* Following flags don't use groups */
-+ if (sd->flags & (SD_WAKE_AFFINE))
-+ return 0;
-+
-+ return 1;
-+}
-+
-+static int
-+sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
-+{
-+ unsigned long cflags = sd->flags, pflags = parent->flags;
-+
-+ if (sd_degenerate(parent))
-+ return 1;
-+
-+ if (!cpumask_equal(sched_domain_span(sd), sched_domain_span(parent)))
-+ return 0;
-+
-+ if (~cflags & pflags)
-+ return 0;
-+
-+ return 1;
-+}
-+
-+static void free_rootdomain(struct rcu_head *rcu)
-+{
-+ struct root_domain *rd = container_of(rcu, struct root_domain, rcu);
-+
-+ cpupri_cleanup(&rd->cpupri);
-+ free_cpumask_var(rd->rto_mask);
-+ free_cpumask_var(rd->online);
-+ free_cpumask_var(rd->span);
-+ kfree(rd);
-+}
-+
-+static void rq_attach_root(struct rq *rq, struct root_domain *rd)
-+{
-+ struct root_domain *old_rd = NULL;
-+ unsigned long flags;
-+
-+ grq_lock_irqsave(&flags);
-+
-+ if (rq->rd) {
-+ old_rd = rq->rd;
-+
-+ if (cpumask_test_cpu(rq->cpu, old_rd->online))
-+ set_rq_offline(rq);
-+
-+ cpumask_clear_cpu(rq->cpu, old_rd->span);
-+
-+ /*
-+ * If we dont want to free the old_rt yet then
-+ * set old_rd to NULL to skip the freeing later
-+ * in this function:
-+ */
-+ if (!atomic_dec_and_test(&old_rd->refcount))
-+ old_rd = NULL;
-+ }
-+
-+ atomic_inc(&rd->refcount);
-+ rq->rd = rd;
-+
-+ cpumask_set_cpu(rq->cpu, rd->span);
-+ if (cpumask_test_cpu(rq->cpu, cpu_active_mask))
-+ set_rq_online(rq);
-+
-+ grq_unlock_irqrestore(&flags);
-+
-+ if (old_rd)
-+ call_rcu_sched(&old_rd->rcu, free_rootdomain);
-+}
-+
-+static int init_rootdomain(struct root_domain *rd)
-+{
-+ memset(rd, 0, sizeof(*rd));
-+
-+ if (!alloc_cpumask_var(&rd->span, GFP_KERNEL))
-+ goto out;
-+ if (!alloc_cpumask_var(&rd->online, GFP_KERNEL))
-+ goto free_span;
-+ if (!alloc_cpumask_var(&rd->rto_mask, GFP_KERNEL))
-+ goto free_online;
-+
-+ if (cpupri_init(&rd->cpupri) != 0)
-+ goto free_rto_mask;
-+ return 0;
-+
-+free_rto_mask:
-+ free_cpumask_var(rd->rto_mask);
-+free_online:
-+ free_cpumask_var(rd->online);
-+free_span:
-+ free_cpumask_var(rd->span);
-+out:
-+ return -ENOMEM;
-+}
-+
-+static void init_defrootdomain(void)
-+{
-+ init_rootdomain(&def_root_domain);
-+
-+ atomic_set(&def_root_domain.refcount, 1);
-+}
-+
-+static struct root_domain *alloc_rootdomain(void)
-+{
-+ struct root_domain *rd;
-+
-+ rd = kmalloc(sizeof(*rd), GFP_KERNEL);
-+ if (!rd)
-+ return NULL;
-+
-+ if (init_rootdomain(rd) != 0) {
-+ kfree(rd);
-+ return NULL;
-+ }
-+
-+ return rd;
-+}
-+
-+static void free_sched_domain(struct rcu_head *rcu)
-+{
-+ struct sched_domain *sd = container_of(rcu, struct sched_domain, rcu);
-+
-+ kfree(sd);
-+}
-+
-+static void destroy_sched_domain(struct sched_domain *sd, int cpu)
-+{
-+ call_rcu(&sd->rcu, free_sched_domain);
-+}
-+
-+static void destroy_sched_domains(struct sched_domain *sd, int cpu)
-+{
-+ for (; sd; sd = sd->parent)
-+ destroy_sched_domain(sd, cpu);
-+}
-+
-+/*
-+ * Attach the domain 'sd' to 'cpu' as its base domain. Callers must
-+ * hold the hotplug lock.
-+ */
-+static void
-+cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
-+{
-+ struct rq *rq = cpu_rq(cpu);
-+ struct sched_domain *tmp;
-+
-+ /* Remove the sched domains which do not contribute to scheduling. */
-+ for (tmp = sd; tmp; ) {
-+ struct sched_domain *parent = tmp->parent;
-+ if (!parent)
-+ break;
-+
-+ if (sd_parent_degenerate(tmp, parent)) {
-+ tmp->parent = parent->parent;
-+ if (parent->parent)
-+ parent->parent->child = tmp;
-+ destroy_sched_domain(parent, cpu);
-+ } else
-+ tmp = tmp->parent;
-+ }
-+
-+ if (sd && sd_degenerate(sd)) {
-+ tmp = sd;
-+ sd = sd->parent;
-+ destroy_sched_domain(tmp, cpu);
-+ if (sd)
-+ sd->child = NULL;
-+ }
-+
-+ sched_domain_debug(sd, cpu);
-+
-+ rq_attach_root(rq, rd);
-+ tmp = rq->sd;
-+ rcu_assign_pointer(rq->sd, sd);
-+ destroy_sched_domains(tmp, cpu);
-+}
-+
-+/* cpus with isolated domains */
-+static cpumask_var_t cpu_isolated_map;
-+
-+/* Setup the mask of cpus configured for isolated domains */
-+static int __init isolated_cpu_setup(char *str)
-+{
-+ alloc_bootmem_cpumask_var(&cpu_isolated_map);
-+ cpulist_parse(str, cpu_isolated_map);
-+ return 1;
-+}
-+
-+__setup("isolcpus=", isolated_cpu_setup);
-+
-+static const struct cpumask *cpu_cpu_mask(int cpu)
-+{
-+ return cpumask_of_node(cpu_to_node(cpu));
-+}
-+
-+struct sd_data {
-+ struct sched_domain **__percpu sd;
-+};
-+
-+struct s_data {
-+ struct sched_domain ** __percpu sd;
-+ struct root_domain *rd;
-+};
-+
-+enum s_alloc {
-+ sa_rootdomain,
-+ sa_sd,
-+ sa_sd_storage,
-+ sa_none,
-+};
-+
-+struct sched_domain_topology_level;
-+
-+typedef struct sched_domain *(*sched_domain_init_f)(struct sched_domain_topology_level *tl, int cpu);
-+typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
-+
-+#define SDTL_OVERLAP 0x01
-+
-+struct sched_domain_topology_level {
-+ sched_domain_init_f init;
-+ sched_domain_mask_f mask;
-+ int flags;
-+ int numa_level;
-+ struct sd_data data;
-+};
-+
-+/*
-+ * Initializers for schedule domains
-+ * Non-inlined to reduce accumulated stack pressure in build_sched_domains()
-+ */
-+
-+#ifdef CONFIG_SCHED_DEBUG
-+# define SD_INIT_NAME(sd, type) sd->name = #type
-+#else
-+# define SD_INIT_NAME(sd, type) do { } while (0)
-+#endif
-+
-+#define SD_INIT_FUNC(type) \
-+static noinline struct sched_domain * \
-+sd_init_##type(struct sched_domain_topology_level *tl, int cpu) \
-+{ \
-+ struct sched_domain *sd = *per_cpu_ptr(tl->data.sd, cpu); \
-+ *sd = SD_##type##_INIT; \
-+ SD_INIT_NAME(sd, type); \
-+ sd->private = &tl->data; \
-+ return sd; \
-+}
-+
-+SD_INIT_FUNC(CPU)
-+#ifdef CONFIG_SCHED_SMT
-+ SD_INIT_FUNC(SIBLING)
-+#endif
-+#ifdef CONFIG_SCHED_MC
-+ SD_INIT_FUNC(MC)
-+#endif
-+#ifdef CONFIG_SCHED_BOOK
-+ SD_INIT_FUNC(BOOK)
-+#endif
-+
-+static int default_relax_domain_level = -1;
-+int sched_domain_level_max;
-+
-+static int __init setup_relax_domain_level(char *str)
-+{
-+ if (kstrtoint(str, 0, &default_relax_domain_level))
-+ pr_warn("Unable to set relax_domain_level\n");
-+
-+ return 1;
-+}
-+__setup("relax_domain_level=", setup_relax_domain_level);
-+
-+static void set_domain_attribute(struct sched_domain *sd,
-+ struct sched_domain_attr *attr)
-+{
-+ int request;
-+
-+ if (!attr || attr->relax_domain_level < 0) {
-+ if (default_relax_domain_level < 0)
-+ return;
-+ else
-+ request = default_relax_domain_level;
-+ } else
-+ request = attr->relax_domain_level;
-+ if (request < sd->level) {
-+ /* turn off idle balance on this domain */
-+ sd->flags &= ~(SD_BALANCE_WAKE|SD_BALANCE_NEWIDLE);
-+ } else {
-+ /* turn on idle balance on this domain */
-+ sd->flags |= (SD_BALANCE_WAKE|SD_BALANCE_NEWIDLE);
-+ }
-+}
-+
-+static void __sdt_free(const struct cpumask *cpu_map);
-+static int __sdt_alloc(const struct cpumask *cpu_map);
-+
-+static void __free_domain_allocs(struct s_data *d, enum s_alloc what,
-+ const struct cpumask *cpu_map)
-+{
-+ switch (what) {
-+ case sa_rootdomain:
-+ if (!atomic_read(&d->rd->refcount))
-+ free_rootdomain(&d->rd->rcu); /* fall through */
-+ case sa_sd:
-+ free_percpu(d->sd); /* fall through */
-+ case sa_sd_storage:
-+ __sdt_free(cpu_map); /* fall through */
-+ case sa_none:
-+ break;
-+ }
-+}
-+
-+static enum s_alloc __visit_domain_allocation_hell(struct s_data *d,
-+ const struct cpumask *cpu_map)
-+{
-+ memset(d, 0, sizeof(*d));
-+
-+ if (__sdt_alloc(cpu_map))
-+ return sa_sd_storage;
-+ d->sd = alloc_percpu(struct sched_domain *);
-+ if (!d->sd)
-+ return sa_sd_storage;
-+ d->rd = alloc_rootdomain();
-+ if (!d->rd)
-+ return sa_sd;
-+ return sa_rootdomain;
-+}
-+
-+/*
-+ * NULL the sd_data elements we've used to build the sched_domain
-+ * structure so that the subsequent __free_domain_allocs()
-+ * will not free the data we're using.
-+ */
-+static void claim_allocations(int cpu, struct sched_domain *sd)
-+{
-+ struct sd_data *sdd = sd->private;
-+
-+ WARN_ON_ONCE(*per_cpu_ptr(sdd->sd, cpu) != sd);
-+ *per_cpu_ptr(sdd->sd, cpu) = NULL;
-+}
-+
-+#ifdef CONFIG_SCHED_SMT
-+static const struct cpumask *cpu_smt_mask(int cpu)
-+{
-+ return topology_thread_cpumask(cpu);
-+}
-+#endif
-+
-+/*
-+ * Topology list, bottom-up.
-+ */
-+static struct sched_domain_topology_level default_topology[] = {
-+#ifdef CONFIG_SCHED_SMT
-+ { sd_init_SIBLING, cpu_smt_mask, },
-+#endif
-+#ifdef CONFIG_SCHED_MC
-+ { sd_init_MC, cpu_coregroup_mask, },
-+#endif
-+#ifdef CONFIG_SCHED_BOOK
-+ { sd_init_BOOK, cpu_book_mask, },
-+#endif
-+ { sd_init_CPU, cpu_cpu_mask, },
-+ { NULL, },
-+};
-+
-+static struct sched_domain_topology_level *sched_domain_topology = default_topology;
-+
-+#ifdef CONFIG_NUMA
-+
-+static int sched_domains_numa_levels;
-+static int *sched_domains_numa_distance;
-+static struct cpumask ***sched_domains_numa_masks;
-+static int sched_domains_curr_level;
-+
-+static inline int sd_local_flags(int level)
-+{
-+ if (sched_domains_numa_distance[level] > RECLAIM_DISTANCE)
-+ return 0;
-+
-+ return SD_BALANCE_EXEC | SD_BALANCE_FORK | SD_WAKE_AFFINE;
-+}
-+
-+static struct sched_domain *
-+sd_numa_init(struct sched_domain_topology_level *tl, int cpu)
-+{
-+ struct sched_domain *sd = *per_cpu_ptr(tl->data.sd, cpu);
-+ int level = tl->numa_level;
-+ int sd_weight = cpumask_weight(
-+ sched_domains_numa_masks[level][cpu_to_node(cpu)]);
-+
-+ *sd = (struct sched_domain){
-+ .min_interval = sd_weight,
-+ .max_interval = 2*sd_weight,
-+ .busy_factor = 32,
-+ .imbalance_pct = 125,
-+ .cache_nice_tries = 2,
-+ .busy_idx = 3,
-+ .idle_idx = 2,
-+ .newidle_idx = 0,
-+ .wake_idx = 0,
-+ .forkexec_idx = 0,
-+
-+ .flags = 1*SD_LOAD_BALANCE
-+ | 1*SD_BALANCE_NEWIDLE
-+ | 0*SD_BALANCE_EXEC
-+ | 0*SD_BALANCE_FORK
-+ | 0*SD_BALANCE_WAKE
-+ | 0*SD_WAKE_AFFINE
-+ | 0*SD_SHARE_CPUPOWER
-+ | 0*SD_SHARE_PKG_RESOURCES
-+ | 1*SD_SERIALIZE
-+ | 0*SD_PREFER_SIBLING
-+ | sd_local_flags(level)
-+ ,
-+ .last_balance = jiffies,
-+ .balance_interval = sd_weight,
-+ };
-+ SD_INIT_NAME(sd, NUMA);
-+ sd->private = &tl->data;
-+
-+ /*
-+ * Ugly hack to pass state to sd_numa_mask()...
-+ */
-+ sched_domains_curr_level = tl->numa_level;
-+
-+ return sd;
-+}
-+
-+static const struct cpumask *sd_numa_mask(int cpu)
-+{
-+ return sched_domains_numa_masks[sched_domains_curr_level][cpu_to_node(cpu)];
-+}
-+
-+static void sched_numa_warn(const char *str)
-+{
-+ static int done = false;
-+ int i,j;
-+
-+ if (done)
-+ return;
-+
-+ done = true;
-+
-+ printk(KERN_WARNING "ERROR: %s\n\n", str);
-+
-+ for (i = 0; i < nr_node_ids; i++) {
-+ printk(KERN_WARNING " ");
-+ for (j = 0; j < nr_node_ids; j++)
-+ printk(KERN_CONT "%02d ", node_distance(i,j));
-+ printk(KERN_CONT "\n");
-+ }
-+ printk(KERN_WARNING "\n");
-+}
-+
-+static bool find_numa_distance(int distance)
-+{
-+ int i;
-+
-+ if (distance == node_distance(0, 0))
-+ return true;
-+
-+ for (i = 0; i < sched_domains_numa_levels; i++) {
-+ if (sched_domains_numa_distance[i] == distance)
-+ return true;
-+ }
-+
-+ return false;
-+}
-+
-+static void sched_init_numa(void)
-+{
-+ int next_distance, curr_distance = node_distance(0, 0);
-+ struct sched_domain_topology_level *tl;
-+ int level = 0;
-+ int i, j, k;
-+
-+ sched_domains_numa_distance = kzalloc(sizeof(int) * nr_node_ids, GFP_KERNEL);
-+ if (!sched_domains_numa_distance)
-+ return;
-+
-+ /*
-+ * O(nr_nodes^2) deduplicating selection sort -- in order to find the
-+ * unique distances in the node_distance() table.
-+ *
-+ * Assumes node_distance(0,j) includes all distances in
-+ * node_distance(i,j) in order to avoid cubic time.
-+ */
-+ next_distance = curr_distance;
-+ for (i = 0; i < nr_node_ids; i++) {
-+ for (j = 0; j < nr_node_ids; j++) {
-+ for (k = 0; k < nr_node_ids; k++) {
-+ int distance = node_distance(i, k);
-+
-+ if (distance > curr_distance &&
-+ (distance < next_distance ||
-+ next_distance == curr_distance))
-+ next_distance = distance;
-+
-+ /*
-+ * While not a strong assumption it would be nice to know
-+ * about cases where if node A is connected to B, B is not
-+ * equally connected to A.
-+ */
-+ if (sched_debug() && node_distance(k, i) != distance)
-+ sched_numa_warn("Node-distance not symmetric");
-+
-+ if (sched_debug() && i && !find_numa_distance(distance))
-+ sched_numa_warn("Node-0 not representative");
-+ }
-+ if (next_distance != curr_distance) {
-+ sched_domains_numa_distance[level++] = next_distance;
-+ sched_domains_numa_levels = level;
-+ curr_distance = next_distance;
-+ } else break;
-+ }
-+
-+ /*
-+ * In case of sched_debug() we verify the above assumption.
-+ */
-+ if (!sched_debug())
-+ break;
-+ }
-+ /*
-+ * 'level' contains the number of unique distances, excluding the
-+ * identity distance node_distance(i,i).
-+ *
-+ * The sched_domains_numa_distance[] array includes the actual distance
-+ * numbers.
-+ */
-+
-+ /*
-+ * Here, we should temporarily reset sched_domains_numa_levels to 0.
-+ * If it fails to allocate memory for array sched_domains_numa_masks[][],
-+ * the array will contain less then 'level' members. This could be
-+ * dangerous when we use it to iterate array sched_domains_numa_masks[][]
-+ * in other functions.
-+ *
-+ * We reset it to 'level' at the end of this function.
-+ */
-+ sched_domains_numa_levels = 0;
-+
-+ sched_domains_numa_masks = kzalloc(sizeof(void *) * level, GFP_KERNEL);
-+ if (!sched_domains_numa_masks)
-+ return;
-+
-+ /*
-+ * Now for each level, construct a mask per node which contains all
-+ * cpus of nodes that are that many hops away from us.
-+ */
-+ for (i = 0; i < level; i++) {
-+ sched_domains_numa_masks[i] =
-+ kzalloc(nr_node_ids * sizeof(void *), GFP_KERNEL);
-+ if (!sched_domains_numa_masks[i])
-+ return;
-+
-+ for (j = 0; j < nr_node_ids; j++) {
-+ struct cpumask *mask = kzalloc(cpumask_size(), GFP_KERNEL);
-+ if (!mask)
-+ return;
-+
-+ sched_domains_numa_masks[i][j] = mask;
-+
-+ for (k = 0; k < nr_node_ids; k++) {
-+ if (node_distance(j, k) > sched_domains_numa_distance[i])
-+ continue;
-+
-+ cpumask_or(mask, mask, cpumask_of_node(k));
-+ }
-+ }
-+ }
-+
-+ tl = kzalloc((ARRAY_SIZE(default_topology) + level) *
-+ sizeof(struct sched_domain_topology_level), GFP_KERNEL);
-+ if (!tl)
-+ return;
-+
-+ /*
-+ * Copy the default topology bits..
-+ */
-+ for (i = 0; default_topology[i].init; i++)
-+ tl[i] = default_topology[i];
-+
-+ /*
-+ * .. and append 'j' levels of NUMA goodness.
-+ */
-+ for (j = 0; j < level; i++, j++) {
-+ tl[i] = (struct sched_domain_topology_level){
-+ .init = sd_numa_init,
-+ .mask = sd_numa_mask,
-+ .flags = SDTL_OVERLAP,
-+ .numa_level = j,
-+ };
-+ }
-+
-+ sched_domain_topology = tl;
-+
-+ sched_domains_numa_levels = level;
-+}
-+
-+static void sched_domains_numa_masks_set(int cpu)
-+{
-+ int i, j;
-+ int node = cpu_to_node(cpu);
-+
-+ for (i = 0; i < sched_domains_numa_levels; i++) {
-+ for (j = 0; j < nr_node_ids; j++) {
-+ if (node_distance(j, node) <= sched_domains_numa_distance[i])
-+ cpumask_set_cpu(cpu, sched_domains_numa_masks[i][j]);
-+ }
-+ }
-+}
-+
-+static void sched_domains_numa_masks_clear(int cpu)
-+{
-+ int i, j;
-+ for (i = 0; i < sched_domains_numa_levels; i++) {
-+ for (j = 0; j < nr_node_ids; j++)
-+ cpumask_clear_cpu(cpu, sched_domains_numa_masks[i][j]);
-+ }
-+}
-+
-+/*
-+ * Update sched_domains_numa_masks[level][node] array when new cpus
-+ * are onlined.
-+ */
-+static int sched_domains_numa_masks_update(struct notifier_block *nfb,
-+ unsigned long action,
-+ void *hcpu)
-+{
-+ int cpu = (long)hcpu;
-+
-+ switch (action & ~CPU_TASKS_FROZEN) {
-+ case CPU_ONLINE:
-+ sched_domains_numa_masks_set(cpu);
-+ break;
-+
-+ case CPU_DEAD:
-+ sched_domains_numa_masks_clear(cpu);
-+ break;
-+
-+ default:
-+ return NOTIFY_DONE;
-+ }
-+
-+ return NOTIFY_OK;
-+}
-+#else
-+static inline void sched_init_numa(void)
-+{
-+}
-+
-+static int sched_domains_numa_masks_update(struct notifier_block *nfb,
-+ unsigned long action,
-+ void *hcpu)
-+{
-+ return 0;
-+}
-+#endif /* CONFIG_NUMA */
-+
-+static int __sdt_alloc(const struct cpumask *cpu_map)
-+{
-+ struct sched_domain_topology_level *tl;
-+ int j;
-+
-+ for (tl = sched_domain_topology; tl->init; tl++) {
-+ struct sd_data *sdd = &tl->data;
-+
-+ sdd->sd = alloc_percpu(struct sched_domain *);
-+ if (!sdd->sd)
-+ return -ENOMEM;
-+
-+ for_each_cpu(j, cpu_map) {
-+ struct sched_domain *sd;
-+
-+ sd = kzalloc_node(sizeof(struct sched_domain) + cpumask_size(),
-+ GFP_KERNEL, cpu_to_node(j));
-+ if (!sd)
-+ return -ENOMEM;
-+
-+ *per_cpu_ptr(sdd->sd, j) = sd;
-+ }
-+ }
-+
-+ return 0;
-+}
-+
-+static void __sdt_free(const struct cpumask *cpu_map)
-+{
-+ struct sched_domain_topology_level *tl;
-+ int j;
-+
-+ for (tl = sched_domain_topology; tl->init; tl++) {
-+ struct sd_data *sdd = &tl->data;
-+
-+ for_each_cpu(j, cpu_map) {
-+ struct sched_domain *sd;
-+
-+ if (sdd->sd) {
-+ sd = *per_cpu_ptr(sdd->sd, j);
-+ kfree(*per_cpu_ptr(sdd->sd, j));
-+ }
-+ }
-+ free_percpu(sdd->sd);
-+ sdd->sd = NULL;
-+ }
-+}
-+
-+struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
-+ struct s_data *d, const struct cpumask *cpu_map,
-+ struct sched_domain_attr *attr, struct sched_domain *child,
-+ int cpu)
-+{
-+ struct sched_domain *sd = tl->init(tl, cpu);
-+ if (!sd)
-+ return child;
-+
-+ cpumask_and(sched_domain_span(sd), cpu_map, tl->mask(cpu));
-+ if (child) {
-+ sd->level = child->level + 1;
-+ sched_domain_level_max = max(sched_domain_level_max, sd->level);
-+ child->parent = sd;
-+ }
-+ sd->child = child;
-+ set_domain_attribute(sd, attr);
-+
-+ return sd;
-+}
-+
-+/*
-+ * Build sched domains for a given set of cpus and attach the sched domains
-+ * to the individual cpus
-+ */
-+static int build_sched_domains(const struct cpumask *cpu_map,
-+ struct sched_domain_attr *attr)
-+{
-+ enum s_alloc alloc_state = sa_none;
-+ struct sched_domain *sd;
-+ struct s_data d;
-+ int i, ret = -ENOMEM;
-+
-+ alloc_state = __visit_domain_allocation_hell(&d, cpu_map);
-+ if (alloc_state != sa_rootdomain)
-+ goto error;
-+
-+ /* Set up domains for cpus specified by the cpu_map. */
-+ for_each_cpu(i, cpu_map) {
-+ struct sched_domain_topology_level *tl;
-+
-+ sd = NULL;
-+ for (tl = sched_domain_topology; tl->init; tl++) {
-+ sd = build_sched_domain(tl, &d, cpu_map, attr, sd, i);
-+ if (tl->flags & SDTL_OVERLAP)
-+ sd->flags |= SD_OVERLAP;
-+ if (cpumask_equal(cpu_map, sched_domain_span(sd)))
-+ break;
-+ }
-+
-+ while (sd->child)
-+ sd = sd->child;
-+
-+ *per_cpu_ptr(d.sd, i) = sd;
-+ }
-+
-+ /* Calculate CPU power for physical packages and nodes */
-+ for (i = nr_cpumask_bits-1; i >= 0; i--) {
-+ if (!cpumask_test_cpu(i, cpu_map))
-+ continue;
-+
-+ for (sd = *per_cpu_ptr(d.sd, i); sd; sd = sd->parent) {
-+ claim_allocations(i, sd);
-+ }
-+ }
-+
-+ /* Attach the domains */
-+ rcu_read_lock();
-+ for_each_cpu(i, cpu_map) {
-+ sd = *per_cpu_ptr(d.sd, i);
-+ cpu_attach_domain(sd, d.rd, i);
-+ }
-+ rcu_read_unlock();
-+
-+ ret = 0;
-+error:
-+ __free_domain_allocs(&d, alloc_state, cpu_map);
-+ return ret;
-+}
-+
-+static cpumask_var_t *doms_cur; /* current sched domains */
-+static int ndoms_cur; /* number of sched domains in 'doms_cur' */
-+static struct sched_domain_attr *dattr_cur;
-+ /* attribues of custom domains in 'doms_cur' */
-+
-+/*
-+ * Special case: If a kmalloc of a doms_cur partition (array of
-+ * cpumask) fails, then fallback to a single sched domain,
-+ * as determined by the single cpumask fallback_doms.
-+ */
-+static cpumask_var_t fallback_doms;
-+
-+/*
-+ * arch_update_cpu_topology lets virtualized architectures update the
-+ * cpu core maps. It is supposed to return 1 if the topology changed
-+ * or 0 if it stayed the same.
-+ */
-+int __attribute__((weak)) arch_update_cpu_topology(void)
-+{
-+ return 0;
-+}
-+
-+cpumask_var_t *alloc_sched_domains(unsigned int ndoms)
-+{
-+ int i;
-+ cpumask_var_t *doms;
-+
-+ doms = kmalloc(sizeof(*doms) * ndoms, GFP_KERNEL);
-+ if (!doms)
-+ return NULL;
-+ for (i = 0; i < ndoms; i++) {
-+ if (!alloc_cpumask_var(&doms[i], GFP_KERNEL)) {
-+ free_sched_domains(doms, i);
-+ return NULL;
-+ }
-+ }
-+ return doms;
-+}
-+
-+void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms)
-+{
-+ unsigned int i;
-+ for (i = 0; i < ndoms; i++)
-+ free_cpumask_var(doms[i]);
-+ kfree(doms);
-+}
-+
-+/*
-+ * Set up scheduler domains and groups. Callers must hold the hotplug lock.
-+ * For now this just excludes isolated cpus, but could be used to
-+ * exclude other special cases in the future.
-+ */
-+static int init_sched_domains(const struct cpumask *cpu_map)
-+{
-+ int err;
-+
-+ arch_update_cpu_topology();
-+ ndoms_cur = 1;
-+ doms_cur = alloc_sched_domains(ndoms_cur);
-+ if (!doms_cur)
-+ doms_cur = &fallback_doms;
-+ cpumask_andnot(doms_cur[0], cpu_map, cpu_isolated_map);
-+ err = build_sched_domains(doms_cur[0], NULL);
-+ register_sched_domain_sysctl();
-+
-+ return err;
-+}
-+
-+/*
-+ * Detach sched domains from a group of cpus specified in cpu_map
-+ * These cpus will now be attached to the NULL domain
-+ */
-+static void detach_destroy_domains(const struct cpumask *cpu_map)
-+{
-+ int i;
-+
-+ rcu_read_lock();
-+ for_each_cpu(i, cpu_map)
-+ cpu_attach_domain(NULL, &def_root_domain, i);
-+ rcu_read_unlock();
-+}
-+
-+/* handle null as "default" */
-+static int dattrs_equal(struct sched_domain_attr *cur, int idx_cur,
-+ struct sched_domain_attr *new, int idx_new)
-+{
-+ struct sched_domain_attr tmp;
-+
-+ /* fast path */
-+ if (!new && !cur)
-+ return 1;
-+
-+ tmp = SD_ATTR_INIT;
-+ return !memcmp(cur ? (cur + idx_cur) : &tmp,
-+ new ? (new + idx_new) : &tmp,
-+ sizeof(struct sched_domain_attr));
-+}
-+
-+/*
-+ * Partition sched domains as specified by the 'ndoms_new'
-+ * cpumasks in the array doms_new[] of cpumasks. This compares
-+ * doms_new[] to the current sched domain partitioning, doms_cur[].
-+ * It destroys each deleted domain and builds each new domain.
-+ *
-+ * 'doms_new' is an array of cpumask_var_t's of length 'ndoms_new'.
-+ * The masks don't intersect (don't overlap.) We should setup one
-+ * sched domain for each mask. CPUs not in any of the cpumasks will
-+ * not be load balanced. If the same cpumask appears both in the
-+ * current 'doms_cur' domains and in the new 'doms_new', we can leave
-+ * it as it is.
-+ *
-+ * The passed in 'doms_new' should be allocated using
-+ * alloc_sched_domains. This routine takes ownership of it and will
-+ * free_sched_domains it when done with it. If the caller failed the
-+ * alloc call, then it can pass in doms_new == NULL && ndoms_new == 1,
-+ * and partition_sched_domains() will fallback to the single partition
-+ * 'fallback_doms', it also forces the domains to be rebuilt.
-+ *
-+ * If doms_new == NULL it will be replaced with cpu_online_mask.
-+ * ndoms_new == 0 is a special case for destroying existing domains,
-+ * and it will not create the default domain.
-+ *
-+ * Call with hotplug lock held
-+ */
-+void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
-+ struct sched_domain_attr *dattr_new)
-+{
-+ int i, j, n;
-+ int new_topology;
-+
-+ mutex_lock(&sched_domains_mutex);
-+
-+ /* always unregister in case we don't destroy any domains */
-+ unregister_sched_domain_sysctl();
-+
-+ /* Let architecture update cpu core mappings. */
-+ new_topology = arch_update_cpu_topology();
-+
-+ n = doms_new ? ndoms_new : 0;
-+
-+ /* Destroy deleted domains */
-+ for (i = 0; i < ndoms_cur; i++) {
-+ for (j = 0; j < n && !new_topology; j++) {
-+ if (cpumask_equal(doms_cur[i], doms_new[j])
-+ && dattrs_equal(dattr_cur, i, dattr_new, j))
-+ goto match1;
-+ }
-+ /* no match - a current sched domain not in new doms_new[] */
-+ detach_destroy_domains(doms_cur[i]);
-+match1:
-+ ;
-+ }
-+
-+ if (doms_new == NULL) {
-+ ndoms_cur = 0;
-+ doms_new = &fallback_doms;
-+ cpumask_andnot(doms_new[0], cpu_active_mask, cpu_isolated_map);
-+ WARN_ON_ONCE(dattr_new);
-+ }
-+
-+ /* Build new domains */
-+ for (i = 0; i < ndoms_new; i++) {
-+ for (j = 0; j < ndoms_cur && !new_topology; j++) {
-+ if (cpumask_equal(doms_new[i], doms_cur[j])
-+ && dattrs_equal(dattr_new, i, dattr_cur, j))
-+ goto match2;
-+ }
-+ /* no match - add a new doms_new */
-+ build_sched_domains(doms_new[i], dattr_new ? dattr_new + i : NULL);
-+match2:
-+ ;
-+ }
-+
-+ /* Remember the new sched domains */
-+ if (doms_cur != &fallback_doms)
-+ free_sched_domains(doms_cur, ndoms_cur);
-+ kfree(dattr_cur); /* kfree(NULL) is safe */
-+ doms_cur = doms_new;
-+ dattr_cur = dattr_new;
-+ ndoms_cur = ndoms_new;
-+
-+ register_sched_domain_sysctl();
-+
-+ mutex_unlock(&sched_domains_mutex);
-+}
-+
-+/*
-+ * Update cpusets according to cpu_active mask. If cpusets are
-+ * disabled, cpuset_update_active_cpus() becomes a simple wrapper
-+ * around partition_sched_domains().
-+ */
-+static int cpuset_cpu_active(struct notifier_block *nfb, unsigned long action,
-+ void *hcpu)
-+{
-+ switch (action & ~CPU_TASKS_FROZEN) {
-+ case CPU_ONLINE:
-+ case CPU_DOWN_FAILED:
-+ cpuset_update_active_cpus(true);
-+ return NOTIFY_OK;
-+ default:
-+ return NOTIFY_DONE;
-+ }
-+}
-+
-+static int cpuset_cpu_inactive(struct notifier_block *nfb, unsigned long action,
-+ void *hcpu)
-+{
-+ switch (action & ~CPU_TASKS_FROZEN) {
-+ case CPU_DOWN_PREPARE:
-+ cpuset_update_active_cpus(false);
-+ return NOTIFY_OK;
-+ default:
-+ return NOTIFY_DONE;
-+ }
-+}
-+
-+#if defined(CONFIG_SCHED_SMT) || defined(CONFIG_SCHED_MC)
-+/*
-+ * Cheaper version of the below functions in case support for SMT and MC is
-+ * compiled in but CPUs have no siblings.
-+ */
-+static bool sole_cpu_idle(int cpu)
-+{
-+ return rq_idle(cpu_rq(cpu));
-+}
-+#endif
-+#ifdef CONFIG_SCHED_SMT
-+/* All this CPU's SMT siblings are idle */
-+static bool siblings_cpu_idle(int cpu)
-+{
-+ return cpumask_subset(&(cpu_rq(cpu)->smt_siblings),
-+ &grq.cpu_idle_map);
-+}
-+#endif
-+#ifdef CONFIG_SCHED_MC
-+/* All this CPU's shared cache siblings are idle */
-+static bool cache_cpu_idle(int cpu)
-+{
-+ return cpumask_subset(&(cpu_rq(cpu)->cache_siblings),
-+ &grq.cpu_idle_map);
-+}
-+#endif
-+
-+enum sched_domain_level {
-+ SD_LV_NONE = 0,
-+ SD_LV_SIBLING,
-+ SD_LV_MC,
-+ SD_LV_BOOK,
-+ SD_LV_CPU,
-+ SD_LV_NODE,
-+ SD_LV_ALLNODES,
-+ SD_LV_MAX
-+};
-+
-+void __init sched_init_smp(void)
-+{
-+ struct sched_domain *sd;
-+ int cpu;
-+
-+ cpumask_var_t non_isolated_cpus;
-+
-+ alloc_cpumask_var(&non_isolated_cpus, GFP_KERNEL);
-+ alloc_cpumask_var(&fallback_doms, GFP_KERNEL);
-+
-+ sched_init_numa();
-+
-+ get_online_cpus();
-+ mutex_lock(&sched_domains_mutex);
-+ init_sched_domains(cpu_active_mask);
-+ cpumask_andnot(non_isolated_cpus, cpu_possible_mask, cpu_isolated_map);
-+ if (cpumask_empty(non_isolated_cpus))
-+ cpumask_set_cpu(smp_processor_id(), non_isolated_cpus);
-+ mutex_unlock(&sched_domains_mutex);
-+ put_online_cpus();
-+
-+ hotcpu_notifier(sched_domains_numa_masks_update, CPU_PRI_SCHED_ACTIVE);
-+ hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE);
-+ hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE);
-+
-+ /* Move init over to a non-isolated CPU */
-+ if (set_cpus_allowed_ptr(current, non_isolated_cpus) < 0)
-+ BUG();
-+ free_cpumask_var(non_isolated_cpus);
-+
-+ grq_lock_irq();
-+ /*
-+ * Set up the relative cache distance of each online cpu from each
-+ * other in a simple array for quick lookup. Locality is determined
-+ * by the closest sched_domain that CPUs are separated by. CPUs with
-+ * shared cache in SMT and MC are treated as local. Separate CPUs
-+ * (within the same package or physically) within the same node are
-+ * treated as not local. CPUs not even in the same domain (different
-+ * nodes) are treated as very distant.
-+ */
-+ for_each_online_cpu(cpu) {
-+ struct rq *rq = cpu_rq(cpu);
-+
-+ mutex_lock(&sched_domains_mutex);
-+ for_each_domain(cpu, sd) {
-+ int locality, other_cpu;
-+
-+#ifdef CONFIG_SCHED_SMT
-+ if (sd->level == SD_LV_SIBLING) {
-+ for_each_cpu_mask(other_cpu, *sched_domain_span(sd))
-+ cpumask_set_cpu(other_cpu, &rq->smt_siblings);
-+ }
-+#endif
-+#ifdef CONFIG_SCHED_MC
-+ if (sd->level == SD_LV_MC) {
-+ for_each_cpu_mask(other_cpu, *sched_domain_span(sd))
-+ cpumask_set_cpu(other_cpu, &rq->cache_siblings);
-+ }
-+#endif
-+ if (sd->level <= SD_LV_SIBLING)
-+ locality = 1;
-+ else if (sd->level <= SD_LV_MC)
-+ locality = 2;
-+ else if (sd->level <= SD_LV_NODE)
-+ locality = 3;
-+ else
-+ continue;
-+
-+ for_each_cpu_mask(other_cpu, *sched_domain_span(sd)) {
-+ if (locality < rq->cpu_locality[other_cpu])
-+ rq->cpu_locality[other_cpu] = locality;
-+ }
-+ }
-+ mutex_unlock(&sched_domains_mutex);
-+
-+ /*
-+ * Each runqueue has its own function in case it doesn't have
-+ * siblings of its own allowing mixed topologies.
-+ */
-+#ifdef CONFIG_SCHED_SMT
-+ if (cpus_weight(rq->smt_siblings) > 1)
-+ rq->siblings_idle = siblings_cpu_idle;
-+#endif
-+#ifdef CONFIG_SCHED_MC
-+ if (cpus_weight(rq->cache_siblings) > 1)
-+ rq->cache_idle = cache_cpu_idle;
-+#endif
-+ }
-+ grq_unlock_irq();
-+}
-+#else
-+void __init sched_init_smp(void)
-+{
-+}
-+#endif /* CONFIG_SMP */
-+
-+unsigned int sysctl_timer_migration = 1;
-+
-+int in_sched_functions(unsigned long addr)
-+{
-+ return in_lock_functions(addr) ||
-+ (addr >= (unsigned long)__sched_text_start
-+ && addr < (unsigned long)__sched_text_end);
-+}
-+
-+void __init sched_init(void)
-+{
-+ int i;
-+ struct rq *rq;
-+
-+ prio_ratios[0] = 128;
-+ for (i = 1 ; i < PRIO_RANGE ; i++)
-+ prio_ratios[i] = prio_ratios[i - 1] * 11 / 10;
-+
-+ raw_spin_lock_init(&grq.lock);
-+ grq.nr_running = grq.nr_uninterruptible = grq.nr_switches = 0;
-+ grq.niffies = 0;
-+ grq.last_jiffy = jiffies;
-+ raw_spin_lock_init(&grq.iso_lock);
-+ grq.iso_ticks = 0;
-+ grq.iso_refractory = false;
-+ grq.noc = 1;
-+#ifdef CONFIG_SMP
-+ init_defrootdomain();
-+ grq.qnr = grq.idle_cpus = 0;
-+ cpumask_clear(&grq.cpu_idle_map);
-+#else
-+ uprq = &per_cpu(runqueues, 0);
-+#endif
-+ for_each_possible_cpu(i) {
-+ rq = cpu_rq(i);
-+ rq->user_pc = rq->nice_pc = rq->softirq_pc = rq->system_pc =
-+ rq->iowait_pc = rq->idle_pc = 0;
-+ rq->dither = false;
-+#ifdef CONFIG_SMP
-+ rq->sticky_task = NULL;
-+ rq->last_niffy = 0;
-+ rq->sd = NULL;
-+ rq->rd = NULL;
-+ rq->online = false;
-+ rq->cpu = i;
-+ rq_attach_root(rq, &def_root_domain);
-+#endif
-+ atomic_set(&rq->nr_iowait, 0);
-+ }
-+
-+#ifdef CONFIG_SMP
-+ nr_cpu_ids = i;
-+ /*
-+ * Set the base locality for cpu cache distance calculation to
-+ * "distant" (3). Make sure the distance from a CPU to itself is 0.
-+ */
-+ for_each_possible_cpu(i) {
-+ int j;
-+
-+ rq = cpu_rq(i);
-+#ifdef CONFIG_SCHED_SMT
-+ cpumask_clear(&rq->smt_siblings);
-+ cpumask_set_cpu(i, &rq->smt_siblings);
-+ rq->siblings_idle = sole_cpu_idle;
-+ cpumask_set_cpu(i, &rq->smt_siblings);
-+#endif
-+#ifdef CONFIG_SCHED_MC
-+ cpumask_clear(&rq->cache_siblings);
-+ cpumask_set_cpu(i, &rq->cache_siblings);
-+ rq->cache_idle = sole_cpu_idle;
-+ cpumask_set_cpu(i, &rq->cache_siblings);
-+#endif
-+ rq->cpu_locality = kmalloc(nr_cpu_ids * sizeof(int *), GFP_ATOMIC);
-+ for_each_possible_cpu(j) {
-+ if (i == j)
-+ rq->cpu_locality[j] = 0;
-+ else
-+ rq->cpu_locality[j] = 4;
-+ }
-+ }
-+#endif
-+
-+ for (i = 0; i < PRIO_LIMIT; i++)
-+ INIT_LIST_HEAD(grq.queue + i);
-+ /* delimiter for bitsearch */
-+ __set_bit(PRIO_LIMIT, grq.prio_bitmap);
-+
-+#ifdef CONFIG_PREEMPT_NOTIFIERS
-+ INIT_HLIST_HEAD(&init_task.preempt_notifiers);
-+#endif
-+
-+#ifdef CONFIG_RT_MUTEXES
-+ plist_head_init(&init_task.pi_waiters);
-+#endif
-+
-+ /*
-+ * The boot idle thread does lazy MMU switching as well:
-+ */
-+ atomic_inc(&init_mm.mm_count);
-+ enter_lazy_tlb(&init_mm, current);
-+
-+ /*
-+ * Make us the idle thread. Technically, schedule() should not be
-+ * called from this thread, however somewhere below it might be,
-+ * but because we are the idle thread, we just pick up running again
-+ * when this runqueue becomes "idle".
-+ */
-+ init_idle(current, smp_processor_id());
-+
-+#ifdef CONFIG_SMP
-+ zalloc_cpumask_var(&sched_domains_tmpmask, GFP_NOWAIT);
-+ /* May be allocated at isolcpus cmdline parse time */
-+ if (cpu_isolated_map == NULL)
-+ zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
-+ idle_thread_set_boot_cpu();
-+#endif /* SMP */
-+}
-+
-+#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
-+static inline int preempt_count_equals(int preempt_offset)
-+{
-+ int nested = (preempt_count() & ~PREEMPT_ACTIVE) + rcu_preempt_depth();
-+
-+ return (nested == preempt_offset);
-+}
-+
-+void __might_sleep(const char *file, int line, int preempt_offset)
-+{
-+ static unsigned long prev_jiffy; /* ratelimiting */
-+
-+ rcu_sleep_check(); /* WARN_ON_ONCE() by default, no rate limit reqd. */
-+ if ((preempt_count_equals(preempt_offset) && !irqs_disabled()) ||
-+ system_state != SYSTEM_RUNNING || oops_in_progress)
-+ return;
-+ if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)
-+ return;
-+ prev_jiffy = jiffies;
-+
-+ printk(KERN_ERR
-+ "BUG: sleeping function called from invalid context at %s:%d\n",
-+ file, line);
-+ printk(KERN_ERR
-+ "in_atomic(): %d, irqs_disabled(): %d, pid: %d, name: %s\n",
-+ in_atomic(), irqs_disabled(),
-+ current->pid, current->comm);
-+
-+ debug_show_held_locks(current);
-+ if (irqs_disabled())
-+ print_irqtrace_events(current);
-+ dump_stack();
-+}
-+EXPORT_SYMBOL(__might_sleep);
-+#endif
-+
-+#ifdef CONFIG_MAGIC_SYSRQ
-+void normalize_rt_tasks(void)
-+{
-+ struct task_struct *g, *p;
-+ unsigned long flags;
-+ struct rq *rq;
-+ int queued;
-+
-+ read_lock_irqsave(&tasklist_lock, flags);
-+
-+ do_each_thread(g, p) {
-+ if (!rt_task(p) && !iso_task(p))
-+ continue;
-+
-+ raw_spin_lock(&p->pi_lock);
-+ rq = __task_grq_lock(p);
-+
-+ queued = task_queued(p);
-+ if (queued)
-+ dequeue_task(p);
-+ __setscheduler(p, rq, SCHED_NORMAL, 0);
-+ if (queued) {
-+ enqueue_task(p);
-+ try_preempt(p, rq);
-+ }
-+
-+ __task_grq_unlock();
-+ raw_spin_unlock(&p->pi_lock);
-+ } while_each_thread(g, p);
-+
-+ read_unlock_irqrestore(&tasklist_lock, flags);
-+}
-+#endif /* CONFIG_MAGIC_SYSRQ */
-+
-+#if defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB)
-+/*
-+ * These functions are only useful for the IA64 MCA handling, or kdb.
-+ *
-+ * They can only be called when the whole system has been
-+ * stopped - every CPU needs to be quiescent, and no scheduling
-+ * activity can take place. Using them for anything else would
-+ * be a serious bug, and as a result, they aren't even visible
-+ * under any other configuration.
-+ */
-+
-+/**
-+ * curr_task - return the current task for a given cpu.
-+ * @cpu: the processor in question.
-+ *
-+ * ONLY VALID WHEN THE WHOLE SYSTEM IS STOPPED!
-+ */
-+struct task_struct *curr_task(int cpu)
-+{
-+ return cpu_curr(cpu);
-+}
-+
-+#endif /* defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB) */
-+
-+#ifdef CONFIG_IA64
-+/**
-+ * set_curr_task - set the current task for a given cpu.
-+ * @cpu: the processor in question.
-+ * @p: the task pointer to set.
-+ *
-+ * Description: This function must only be used when non-maskable interrupts
-+ * are serviced on a separate stack. It allows the architecture to switch the
-+ * notion of the current task on a cpu in a non-blocking manner. This function
-+ * must be called with all CPU's synchronised, and interrupts disabled, the
-+ * and caller must save the original value of the current task (see
-+ * curr_task() above) and restore that value before reenabling interrupts and
-+ * re-starting the system.
-+ *
-+ * ONLY VALID WHEN THE WHOLE SYSTEM IS STOPPED!
-+ */
-+void set_curr_task(int cpu, struct task_struct *p)
-+{
-+ cpu_curr(cpu) = p;
-+}
-+
-+#endif
-+
-+/*
-+ * Use precise platform statistics if available:
-+ */
-+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
-+void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
-+{
-+ *ut = p->utime;
-+ *st = p->stime;
-+}
-+
-+void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
-+{
-+ struct task_cputime cputime;
-+
-+ thread_group_cputime(p, &cputime);
-+
-+ *ut = cputime.utime;
-+ *st = cputime.stime;
-+}
-+
-+void vtime_account_system_irqsafe(struct task_struct *tsk)
-+{
-+ unsigned long flags;
-+
-+ local_irq_save(flags);
-+ vtime_account_system(tsk);
-+ local_irq_restore(flags);
-+}
-+EXPORT_SYMBOL_GPL(vtime_account_system_irqsafe);
-+
-+#ifndef __ARCH_HAS_VTIME_TASK_SWITCH
-+void vtime_task_switch(struct task_struct *prev)
-+{
-+ if (is_idle_task(prev))
-+ vtime_account_idle(prev);
-+ else
-+ vtime_account_system(prev);
-+
-+ vtime_account_user(prev);
-+ arch_vtime_task_switch(prev);
-+}
-+#endif
-+
-+#else
-+/*
-+ * Perform (stime * rtime) / total, but avoid multiplication overflow by
-+ * losing precision when the numbers are big.
-+ */
-+static cputime_t scale_stime(u64 stime, u64 rtime, u64 total)
-+{
-+ u64 scaled;
-+
-+ for (;;) {
-+ /* Make sure "rtime" is the bigger of stime/rtime */
-+ if (stime > rtime) {
-+ u64 tmp = rtime; rtime = stime; stime = tmp;
-+ }
-+
-+ /* Make sure 'total' fits in 32 bits */
-+ if (total >> 32)
-+ goto drop_precision;
-+
-+ /* Does rtime (and thus stime) fit in 32 bits? */
-+ if (!(rtime >> 32))
-+ break;
-+
-+ /* Can we just balance rtime/stime rather than dropping bits? */
-+ if (stime >> 31)
-+ goto drop_precision;
-+
-+ /* We can grow stime and shrink rtime and try to make them both fit */
-+ stime <<= 1;
-+ rtime >>= 1;
-+ continue;
-+
-+drop_precision:
-+ /* We drop from rtime, it has more bits than stime */
-+ rtime >>= 1;
-+ total >>= 1;
-+ }
-+
-+ /*
-+ * Make sure gcc understands that this is a 32x32->64 multiply,
-+ * followed by a 64/32->64 divide.
-+ */
-+ scaled = div_u64((u64) (u32) stime * (u64) (u32) rtime, (u32)total);
-+ return (__force cputime_t) scaled;
-+}
-+
-+/*
-+ * Adjust tick based cputime random precision against scheduler
-+ * runtime accounting.
-+ */
-+static void cputime_adjust(struct task_cputime *curr,
-+ struct cputime *prev,
-+ cputime_t *ut, cputime_t *st)
-+{
-+ cputime_t rtime, stime, utime, total;
-+
-+ stime = curr->stime;
-+ total = stime + curr->utime;
-+
-+ /*
-+ * Tick based cputime accounting depend on random scheduling
-+ * timeslices of a task to be interrupted or not by the timer.
-+ * Depending on these circumstances, the number of these interrupts
-+ * may be over or under-optimistic, matching the real user and system
-+ * cputime with a variable precision.
-+ *
-+ * Fix this by scaling these tick based values against the total
-+ * runtime accounted by the CFS scheduler.
-+ */
-+ rtime = nsecs_to_cputime(curr->sum_exec_runtime);
-+
-+ /*
-+ * Update userspace visible utime/stime values only if actual execution
-+ * time is bigger than already exported. Note that can happen, that we
-+ * provided bigger values due to scaling inaccuracy on big numbers.
-+ */
-+ if (prev->stime + prev->utime >= rtime)
-+ goto out;
-+
-+ if (total) {
-+ stime = scale_stime((__force u64)stime,
-+ (__force u64)rtime, (__force u64)total);
-+ utime = rtime - stime;
-+ } else {
-+ stime = rtime;
-+ utime = 0;
-+ }
-+
-+ /*
-+ * If the tick based count grows faster than the scheduler one,
-+ * the result of the scaling may go backward.
-+ * Let's enforce monotonicity.
-+ */
-+ prev->stime = max(prev->stime, stime);
-+ prev->utime = max(prev->utime, utime);
-+
-+out:
-+ *ut = prev->utime;
-+ *st = prev->stime;
-+}
-+
-+void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
-+{
-+ struct task_cputime cputime = {
-+ .sum_exec_runtime = tsk_seruntime(p),
-+ };
-+
-+ task_cputime(p, &cputime.utime, &cputime.stime);
-+ cputime_adjust(&cputime, &p->prev_cputime, ut, st);
-+}
-+
-+/*
-+ * Must be called with siglock held.
-+ */
-+void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
-+{
-+ struct task_cputime cputime;
-+
-+ thread_group_cputime(p, &cputime);
-+ cputime_adjust(&cputime, &p->signal->prev_cputime, ut, st);
-+}
-+#endif
-+
-+void __cpuinit init_idle_bootup_task(struct task_struct *idle)
-+{}
-+
-+#ifdef CONFIG_SCHED_DEBUG
-+void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
-+{}
-+
-+void proc_sched_set_task(struct task_struct *p)
-+{}
-+#endif
-+
-+#ifdef CONFIG_SMP
-+#define SCHED_LOAD_SHIFT (10)
-+#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
-+
-+unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu)
-+{
-+ return SCHED_LOAD_SCALE;
-+}
-+
-+unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu)
-+{
-+ unsigned long weight = cpumask_weight(sched_domain_span(sd));
-+ unsigned long smt_gain = sd->smt_gain;
-+
-+ smt_gain /= weight;
-+
-+ return smt_gain;
-+}
-+#endif
-Index: linux-3.10-ck1/include/uapi/linux/sched.h
-===================================================================
---- linux-3.10-ck1.orig/include/uapi/linux/sched.h 2013-07-09 17:28:57.142502083 +1000
-+++ linux-3.10-ck1/include/uapi/linux/sched.h 2013-07-09 17:29:00.843501924 +1000
-@@ -37,8 +37,15 @@
- #define SCHED_FIFO 1
- #define SCHED_RR 2
- #define SCHED_BATCH 3
--/* SCHED_ISO: reserved but not implemented yet */
-+/* SCHED_ISO: Implemented on BFS only */
- #define SCHED_IDLE 5
-+#ifdef CONFIG_SCHED_BFS
-+#define SCHED_ISO 4
-+#define SCHED_IDLEPRIO SCHED_IDLE
-+#define SCHED_MAX (SCHED_IDLEPRIO)
-+#define SCHED_RANGE(policy) ((policy) <= SCHED_MAX)
-+#endif
-+
- /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
- #define SCHED_RESET_ON_FORK 0x40000000
-
-Index: linux-3.10-ck1/include/linux/sched/rt.h
-===================================================================
---- linux-3.10-ck1.orig/include/linux/sched/rt.h 2013-07-09 17:28:57.158502083 +1000
-+++ linux-3.10-ck1/include/linux/sched/rt.h 2013-07-09 17:29:00.844501924 +1000
-@@ -14,11 +14,24 @@
- * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
- */
-
-+#ifdef CONFIG_SCHED_BFS
-+#define MAX_USER_RT_PRIO 100
-+#define MAX_RT_PRIO (MAX_USER_RT_PRIO + 1)
-+#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
-+
-+#define PRIO_RANGE (40)
-+#define MAX_PRIO (MAX_RT_PRIO + PRIO_RANGE)
-+#define ISO_PRIO (MAX_RT_PRIO)
-+#define NORMAL_PRIO (MAX_RT_PRIO + 1)
-+#define IDLE_PRIO (MAX_RT_PRIO + 2)
-+#define PRIO_LIMIT ((IDLE_PRIO) + 1)
-+#else /* CONFIG_SCHED_BFS */
- #define MAX_USER_RT_PRIO 100
- #define MAX_RT_PRIO MAX_USER_RT_PRIO
-
- #define MAX_PRIO (MAX_RT_PRIO + 40)
- #define DEFAULT_PRIO (MAX_RT_PRIO + 20)
-+#endif /* CONFIG_SCHED_BFS */
-
- static inline int rt_prio(int prio)
- {
-Index: linux-3.10-ck1/kernel/stop_machine.c
-===================================================================
---- linux-3.10-ck1.orig/kernel/stop_machine.c 2013-07-09 17:28:57.177502082 +1000
-+++ linux-3.10-ck1/kernel/stop_machine.c 2013-07-09 17:29:00.844501924 +1000
-@@ -40,7 +40,8 @@
- };
-
- static DEFINE_PER_CPU(struct cpu_stopper, cpu_stopper);
--static DEFINE_PER_CPU(struct task_struct *, cpu_stopper_task);
-+DEFINE_PER_CPU(struct task_struct *, cpu_stopper_task);
-+
- static bool stop_machine_initialized = false;
-
- static void cpu_stop_init_done(struct cpu_stop_done *done, unsigned int nr_todo)
-Index: linux-3.10-ck1/drivers/cpufreq/cpufreq_conservative.c
-===================================================================
---- linux-3.10-ck1.orig/drivers/cpufreq/cpufreq_conservative.c 2013-07-09 17:28:57.219502080 +1000
-+++ linux-3.10-ck1/drivers/cpufreq/cpufreq_conservative.c 2013-07-09 17:29:00.844501924 +1000
-@@ -27,8 +27,8 @@
- #include "cpufreq_governor.h"
-
- /* Conservative governor macros */
--#define DEF_FREQUENCY_UP_THRESHOLD (80)
--#define DEF_FREQUENCY_DOWN_THRESHOLD (20)
-+#define DEF_FREQUENCY_UP_THRESHOLD (63)
-+#define DEF_FREQUENCY_DOWN_THRESHOLD (26)
- #define DEF_FREQUENCY_STEP (5)
- #define DEF_SAMPLING_DOWN_FACTOR (1)
- #define MAX_SAMPLING_DOWN_FACTOR (10)
-Index: linux-3.10-ck1/kernel/sched/Makefile
-===================================================================
---- linux-3.10-ck1.orig/kernel/sched/Makefile 2013-07-09 17:28:57.194502081 +1000
-+++ linux-3.10-ck1/kernel/sched/Makefile 2013-07-09 17:29:00.844501924 +1000
-@@ -11,9 +11,13 @@
- CFLAGS_core.o := $(PROFILING) -fno-omit-frame-pointer
- endif
-
-+ifdef CONFIG_SCHED_BFS
-+obj-y += bfs.o clock.o
-+else
- obj-y += core.o clock.o cputime.o idle_task.o fair.o rt.o stop_task.o
--obj-$(CONFIG_SMP) += cpupri.o
- obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o
--obj-$(CONFIG_SCHEDSTATS) += stats.o
- obj-$(CONFIG_SCHED_DEBUG) += debug.o
- obj-$(CONFIG_CGROUP_CPUACCT) += cpuacct.o
-+endif
-+obj-$(CONFIG_SMP) += cpupri.o
-+obj-$(CONFIG_SCHEDSTATS) += stats.o
-Index: linux-3.10-ck1/kernel/time/Kconfig
-===================================================================
---- linux-3.10-ck1.orig/kernel/time/Kconfig 2013-07-09 17:28:57.190502081 +1000
-+++ linux-3.10-ck1/kernel/time/Kconfig 2013-07-09 17:29:00.844501924 +1000
-@@ -94,7 +94,7 @@
- config NO_HZ_FULL
- bool "Full dynticks system (tickless)"
- # NO_HZ_COMMON dependency
-- depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
-+ depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS && !SCHED_BFS
- # We need at least one periodic CPU for timekeeping
- depends on SMP
- # RCU_USER_QS dependency
-Index: linux-3.10-ck1/kernel/Kconfig.preempt
-===================================================================
---- linux-3.10-ck1.orig/kernel/Kconfig.preempt 2013-07-09 17:28:57.103502085 +1000
-+++ linux-3.10-ck1/kernel/Kconfig.preempt 2013-07-09 17:29:01.081501914 +1000
-@@ -1,7 +1,7 @@
-
- choice
- prompt "Preemption Model"
-- default PREEMPT_NONE
-+ default PREEMPT
-
- config PREEMPT_NONE
- bool "No Forced Preemption (Server)"
-@@ -17,7 +17,7 @@
- latencies.
-
- config PREEMPT_VOLUNTARY
-- bool "Voluntary Kernel Preemption (Desktop)"
-+ bool "Voluntary Kernel Preemption (Nothing)"
- help
- This option reduces the latency of the kernel by adding more
- "explicit preemption points" to the kernel code. These new
-@@ -31,7 +31,8 @@
- applications to run more 'smoothly' even when the system is
- under load.
-
-- Select this if you are building a kernel for a desktop system.
-+ Select this for no system in particular (choose Preemptible
-+ instead on a desktop if you know what's good for you).
-
- config PREEMPT
- bool "Preemptible Kernel (Low-Latency Desktop)"
-Index: linux-3.10-ck1/kernel/Kconfig.hz
-===================================================================
---- linux-3.10-ck1.orig/kernel/Kconfig.hz 2013-07-09 17:28:57.088502086 +1000
-+++ linux-3.10-ck1/kernel/Kconfig.hz 2013-07-09 17:29:01.287501905 +1000
-@@ -4,7 +4,7 @@
-
- choice
- prompt "Timer frequency"
-- default HZ_250
-+ default HZ_1000
- help
- Allows the configuration of the timer frequency. It is customary
- to have the timer interrupt run at 1000 Hz but 100 Hz may be more
-@@ -23,13 +23,14 @@
- with lots of processors that may show reduced performance if
- too many timer interrupts are occurring.
-
-- config HZ_250
-+ config HZ_250_NODEFAULT
- bool "250 HZ"
- help
-- 250 Hz is a good compromise choice allowing server performance
-- while also showing good interactive responsiveness even
-- on SMP and NUMA systems. If you are going to be using NTSC video
-- or multimedia, selected 300Hz instead.
-+ 250 HZ is a lousy compromise choice allowing server interactivity
-+ while also showing desktop throughput and no extra power saving on
-+ laptops. No good for anything.
-+
-+ Recommend 100 or 1000 instead.
-
- config HZ_300
- bool "300 HZ"
-@@ -43,14 +44,16 @@
- bool "1000 HZ"
- help
- 1000 Hz is the preferred choice for desktop systems and other
-- systems requiring fast interactive responses to events.
-+ systems requiring fast interactive responses to events. Laptops
-+ can also benefit from this choice without sacrificing battery life
-+ if dynticks is also enabled.
-
- endchoice
-
- config HZ
- int
- default 100 if HZ_100
-- default 250 if HZ_250
-+ default 250 if HZ_250_NODEFAULT
- default 300 if HZ_300
- default 1000 if HZ_1000
-
-Index: linux-3.10-ck1/arch/x86/Kconfig
-===================================================================
---- linux-3.10-ck1.orig/arch/x86/Kconfig 2013-07-09 17:28:57.044502087 +1000
-+++ linux-3.10-ck1/arch/x86/Kconfig 2013-07-09 17:29:01.392501900 +1000
-@@ -1149,7 +1149,7 @@
- endchoice
-
- choice
-- prompt "Memory split" if EXPERT
-+ prompt "Memory split"
- default VMSPLIT_3G
- depends on X86_32
- ---help---
-@@ -1169,17 +1169,17 @@
- option alone!
-
- config VMSPLIT_3G
-- bool "3G/1G user/kernel split"
-+ bool "Default 896MB lowmem (3G/1G user/kernel split)"
- config VMSPLIT_3G_OPT
- depends on !X86_PAE
-- bool "3G/1G user/kernel split (for full 1G low memory)"
-+ bool "1GB lowmem (3G/1G user/kernel split)"
- config VMSPLIT_2G
-- bool "2G/2G user/kernel split"
-+ bool "2GB lowmem (2G/2G user/kernel split)"
- config VMSPLIT_2G_OPT
- depends on !X86_PAE
-- bool "2G/2G user/kernel split (for full 2G low memory)"
-+ bool "2GB lowmem (2G/2G user/kernel split)"
- config VMSPLIT_1G
-- bool "1G/3G user/kernel split"
-+ bool "3GB lowmem (1G/3G user/kernel split)"
- endchoice
-
- config PAGE_OFFSET
-Index: linux-3.10-ck1/Makefile
-===================================================================
---- linux-3.10-ck1.orig/Makefile 2013-07-09 17:28:57.029502088 +1000
-+++ linux-3.10-ck1/Makefile 2013-07-09 17:29:01.490501896 +1000
-@@ -10,6 +10,10 @@
- # Comments in this file are targeted only to the developer, do not
- # expect to learn how to build the kernel reading this file.
-
-+CKVERSION = -ck1
-+CKNAME = BFS Powered
-+EXTRAVERSION := $(EXTRAVERSION)$(CKVERSION)
-+
- # Do not:
- # o use make's built-in rules and variables
- # (this increases performance and avoids hard-to-debug behaviour);
diff --git a/sys-kernel/kogaion-sources/files/desktop/change-default-console-loglevel.patch b/sys-kernel/kogaion-sources/files/desktop/change-default-console-loglevel.patch
deleted file mode 100644
index 5f16dee5..00000000
--- a/sys-kernel/kogaion-sources/files/desktop/change-default-console-loglevel.patch
+++ /dev/null
@@ -1,13 +0,0 @@
-// change-default-console-loglevel.patch
-diff -upr linux-3.0.orig/kernel/printk.c linux-3.0/kernel/printk.c
---- linux-3.0.orig/kernel/printk.c 2011-07-22 05:17:23.000000000 +0300
-+++ linux-3.0/kernel/printk.c 2011-07-27 14:43:07.000000000 +0300
-@@ -58,7 +58,7 @@ void asmlinkage __attribute__((weak)) ea
-
- /* We show everything that is MORE important than this.. */
- #define MINIMUM_CONSOLE_LOGLEVEL 1 /* Minimum loglevel we let people use */
--#define DEFAULT_CONSOLE_LOGLEVEL 7 /* anything MORE serious than KERN_DEBUG */
-+#define DEFAULT_CONSOLE_LOGLEVEL 4 /* anything MORE serious than KERN_WARNING */
-
- DECLARE_WAIT_QUEUE_HEAD(log_wait);
-
diff --git a/sys-kernel/kogaion-sources/files/desktop/criu-no-expert.patch b/sys-kernel/kogaion-sources/files/desktop/criu-no-expert.patch
deleted file mode 100644
index b22aa9f5..00000000
--- a/sys-kernel/kogaion-sources/files/desktop/criu-no-expert.patch
+++ /dev/null
@@ -1,23 +0,0 @@
-// criu-no-expert.patch
-diff --git a/init/Kconfig b/init/Kconfig
-index be8b7f5..7461760 100644
---- a/init/Kconfig
-+++ b/init/Kconfig
-@@ -989,7 +989,7 @@ config DEBUG_BLK_CGROUP
- endif # CGROUPS
-
- config CHECKPOINT_RESTORE
-- bool "Checkpoint/restore support" if EXPERT
-+ bool "Checkpoint/restore support"
- default n
- help
- Enables additional kernel features in a sake of checkpoint/restore.
-@@ -1000,7 +1000,7 @@ config CHECKPOINT_RESTORE
- If unsure, say N here.
-
- menuconfig NAMESPACES
-- bool "Namespaces support" if EXPERT
-+ bool "Namespaces support"
- default !EXPERT
- help
- Provides the way to make tasks work with different objects using
diff --git a/sys-kernel/kogaion-sources/files/desktop/enable_haswell_pstate_driver.patch b/sys-kernel/kogaion-sources/files/desktop/enable_haswell_pstate_driver.patch
deleted file mode 100644
index 031f8d2f..00000000
--- a/sys-kernel/kogaion-sources/files/desktop/enable_haswell_pstate_driver.patch
+++ /dev/null
@@ -1,33 +0,0 @@
-// enable_haswell_pstate_driver.patch
---- linux-3.10/drivers/cpufreq/intel_pstate.c 2013-06-30 18:13:29.000000000 -0400
-+++ linux-3.10.mod/drivers/cpufreq/intel_pstate.c 2013-07-05 03:10:36.164568840 -0400
-@@ -522,6 +522,11 @@
- ICPU(0x2a, default_policy),
- ICPU(0x2d, default_policy),
- ICPU(0x3a, default_policy),
-+ ICPU(0x3a, default_policy),
-+ ICPU(0x3c, default_policy),
-+ ICPU(0x3f, default_policy),
-+ ICPU(0x45, default_policy),
-+ ICPU(0x46, default_policy),
- {}
- };
- MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
---- linux-3.10/drivers/cpufreq/Kconfig.x86 2013-06-30 18:13:29.000000000 -0400
-+++ linux-3.10.mod/drivers/cpufreq/Kconfig.x86 2013-07-05 03:13:22.823827792 -0400
-@@ -6,12 +6,12 @@
- bool "Intel P state control"
- depends on X86
- help
-- This driver provides a P state for Intel core processors.
-+ This driver provides a P state for Intel Core processors.
- The driver implements an internal governor and will become
-- the scaling driver and governor for Sandy bridge processors.
-+ the scaling driver and governor for Sandy/Ivy Bridge and Haswell processors.
-
- When this driver is enabled it will become the perferred
-- scaling driver for Sandy bridge processors.
-+ scaling driver for Sandy/Ivy Bridge and Haswell processors.
-
- If in doubt, say N.
-
diff --git a/sys-kernel/kogaion-sources/files/desktop/set_kogaion_extraversion_in_makefile.patch b/sys-kernel/kogaion-sources/files/desktop/set_kogaion_extraversion_in_makefile.patch
deleted file mode 100644
index a20090f8..00000000
--- a/sys-kernel/kogaion-sources/files/desktop/set_kogaion_extraversion_in_makefile.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff -Nur a/Makefile b/Makefile
---- a/Makefile 2014-01-30 20:52:03.849613917 +0200
-+++ b/Makefile 2014-01-30 20:56:12.859500865 +0200
-@@ -10,7 +10,7 @@
- # Comments in this file are targeted only to the developer, do not
- # expect to learn how to build the kernel reading this file.
-
--CKVERSION = -ck1
-+CKVERSION = -kogaion
- CKNAME = BFS Powered
- EXTRAVERSION := $(EXTRAVERSION)$(CKVERSION)
-
diff --git a/sys-kernel/kogaion-sources/files/desktop/uksm-0.1.2.2-for-v3.10.patch b/sys-kernel/kogaion-sources/files/desktop/uksm-0.1.2.2-for-v3.10.patch
deleted file mode 100644
index f62addd2..00000000
--- a/sys-kernel/kogaion-sources/files/desktop/uksm-0.1.2.2-for-v3.10.patch
+++ /dev/null
@@ -1,7064 +0,0 @@
-diff --git a/Documentation/vm/00-INDEX b/Documentation/vm/00-INDEX
-index 5481c8b..7141876 100644
---- a/Documentation/vm/00-INDEX
-+++ b/Documentation/vm/00-INDEX
-@@ -14,6 +14,8 @@ hwpoison.txt
- - explains what hwpoison is
- ksm.txt
- - how to use the Kernel Samepage Merging feature.
-+uksm.txt
-+ - Introduction to Ultra KSM
- locking
- - info on how locking and synchronization is done in the Linux vm code.
- map_hugetlb.c
-diff --git a/Documentation/vm/uksm.txt b/Documentation/vm/uksm.txt
-new file mode 100644
-index 0000000..9b2cb51
---- /dev/null
-+++ b/Documentation/vm/uksm.txt
-@@ -0,0 +1,57 @@
-+The Ultra Kernel Samepage Merging feature
-+----------------------------------------------
-+/*
-+ * Ultra KSM. Copyright (C) 2011-2012 Nai Xia
-+ *
-+ * This is an improvement upon KSM. Some basic data structures and routines
-+ * are borrowed from ksm.c .
-+ *
-+ * Its new features:
-+ * 1. Full system scan:
-+ * It automatically scans all user processes' anonymous VMAs. Kernel-user
-+ * interaction to submit a memory area to KSM is no longer needed.
-+ *
-+ * 2. Rich area detection:
-+ * It automatically detects rich areas containing abundant duplicated
-+ * pages based. Rich areas are given a full scan speed. Poor areas are
-+ * sampled at a reasonable speed with very low CPU consumption.
-+ *
-+ * 3. Ultra Per-page scan speed improvement:
-+ * A new hash algorithm is proposed. As a result, on a machine with
-+ * Core(TM)2 Quad Q9300 CPU in 32-bit mode and 800MHZ DDR2 main memory, it
-+ * can scan memory areas that does not contain duplicated pages at speed of
-+ * 627MB/sec ~ 2445MB/sec and can merge duplicated areas at speed of
-+ * 477MB/sec ~ 923MB/sec.
-+ *
-+ * 4. Thrashing area avoidance:
-+ * Thrashing area(an VMA that has frequent Ksm page break-out) can be
-+ * filtered out. My benchmark shows it's more efficient than KSM's per-page
-+ * hash value based volatile page detection.
-+ *
-+ *
-+ * 5. Misc changes upon KSM:
-+ * * It has a fully x86-opitmized memcmp dedicated for 4-byte-aligned page
-+ * comparison. It's much faster than default C version on x86.
-+ * * rmap_item now has an struct *page member to loosely cache a
-+ * address-->page mapping, which reduces too much time-costly
-+ * follow_page().
-+ * * The VMA creation/exit procedures are hooked to let the Ultra KSM know.
-+ * * try_to_merge_two_pages() now can revert a pte if it fails. No break_
-+ * ksm is needed for this case.
-+ *
-+ * 6. Full Zero Page consideration(contributed by Figo Zhang)
-+ * Now uksmd consider full zero pages as special pages and merge them to an
-+ * special unswappable uksm zero page.
-+ */
-+
-+ChangeLog:
-+
-+2012-05-05 The creation of this Doc
-+2012-05-08 UKSM 0.1.1.1 libc crash bug fix, api clean up, doc clean up.
-+2012-05-28 UKSM 0.1.1.2 bug fix release
-+2012-06-26 UKSM 0.1.2-beta1 first beta release for 0.1.2
-+2012-07-2 UKSM 0.1.2-beta2
-+2012-07-10 UKSM 0.1.2-beta3
-+2012-07-26 UKSM 0.1.2 Fine grained speed control, more scan optimization.
-+2012-10-13 UKSM 0.1.2.1 Bug fixes.
-+2012-12-31 UKSM 0.1.2.2 Minor bug fixes
-diff --git a/fs/exec.c b/fs/exec.c
-index ffd7a81..1c4d7d3 100644
---- a/fs/exec.c
-+++ b/fs/exec.c
-@@ -19,7 +19,7 @@
- * current->executable is only used by the procfs. This allows a dispatch
- * table to check for several different types of binary formats. We keep
- * trying until we recognize the file or we run out of supported binary
-- * formats.
-+ * formats.
- */
-
- #include <linux/slab.h>
-@@ -55,6 +55,7 @@
- #include <linux/pipe_fs_i.h>
- #include <linux/oom.h>
- #include <linux/compat.h>
-+#include <linux/ksm.h>
-
- #include <asm/uaccess.h>
- #include <asm/mmu_context.h>
-@@ -1139,7 +1140,7 @@ void setup_new_exec(struct linux_binprm * bprm)
- group */
-
- current->self_exec_id++;
--
-+
- flush_signal_handlers(current, 0);
- do_close_on_exec(current->files);
- }
-@@ -1265,8 +1266,8 @@ static int check_unsafe_exec(struct linux_binprm *bprm)
- return res;
- }
-
--/*
-- * Fill the binprm structure from the inode.
-+/*
-+ * Fill the binprm structure from the inode.
- * Check permissions, then read the first 128 (BINPRM_BUF_SIZE) bytes
- *
- * This may be called multiple times for binary chains (scripts for example).
-diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
-index 5aa847a..c6c5553 100644
---- a/fs/proc/meminfo.c
-+++ b/fs/proc/meminfo.c
-@@ -88,6 +88,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
- "SUnreclaim: %8lu kB\n"
- "KernelStack: %8lu kB\n"
- "PageTables: %8lu kB\n"
-+#ifdef CONFIG_UKSM
-+ "KsmZeroPages: %8lu kB\n"
-+#endif
- #ifdef CONFIG_QUICKLIST
- "Quicklists: %8lu kB\n"
- #endif
-@@ -147,6 +150,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
- K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
- global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
- K(global_page_state(NR_PAGETABLE)),
-+#ifdef CONFIG_UKSM
-+ K(global_page_state(NR_UKSM_ZERO_PAGES)),
-+#endif
- #ifdef CONFIG_QUICKLIST
- K(quicklist_total_size()),
- #endif
-diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
-index a59ff51..df359cc 100644
---- a/include/asm-generic/pgtable.h
-+++ b/include/asm-generic/pgtable.h
-@@ -453,12 +453,25 @@ extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,
- unsigned long size);
- #endif
-
-+#ifdef CONFIG_UKSM
-+static inline int is_uksm_zero_pfn(unsigned long pfn)
-+{
-+ extern unsigned long uksm_zero_pfn;
-+ return pfn == uksm_zero_pfn;
-+}
-+#else
-+static inline int is_uksm_zero_pfn(unsigned long pfn)
-+{
-+ return 0;
-+}
-+#endif
-+
- #ifdef __HAVE_COLOR_ZERO_PAGE
- static inline int is_zero_pfn(unsigned long pfn)
- {
- extern unsigned long zero_pfn;
- unsigned long offset_from_zero_pfn = pfn - zero_pfn;
-- return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
-+ return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT) || is_uksm_zero_pfn(pfn);
- }
-
- #define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr))
-@@ -467,7 +480,7 @@ static inline int is_zero_pfn(unsigned long pfn)
- static inline int is_zero_pfn(unsigned long pfn)
- {
- extern unsigned long zero_pfn;
-- return pfn == zero_pfn;
-+ return (pfn == zero_pfn) || (is_uksm_zero_pfn(pfn));
- }
-
- static inline unsigned long my_zero_pfn(unsigned long addr)
-diff --git a/include/linux/ksm.h b/include/linux/ksm.h
-index 45c9b6a..c7de7a7 100644
---- a/include/linux/ksm.h
-+++ b/include/linux/ksm.h
-@@ -19,21 +19,6 @@ struct mem_cgroup;
- #ifdef CONFIG_KSM
- int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
- unsigned long end, int advice, unsigned long *vm_flags);
--int __ksm_enter(struct mm_struct *mm);
--void __ksm_exit(struct mm_struct *mm);
--
--static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
--{
-- if (test_bit(MMF_VM_MERGEABLE, &oldmm->flags))
-- return __ksm_enter(mm);
-- return 0;
--}
--
--static inline void ksm_exit(struct mm_struct *mm)
--{
-- if (test_bit(MMF_VM_MERGEABLE, &mm->flags))
-- __ksm_exit(mm);
--}
-
- /*
- * A KSM page is one of those write-protected "shared pages" or "merged pages"
-@@ -80,6 +65,33 @@ int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
- struct vm_area_struct *, unsigned long, void *), void *arg);
- void ksm_migrate_page(struct page *newpage, struct page *oldpage);
-
-+#ifdef CONFIG_KSM_LEGACY
-+int __ksm_enter(struct mm_struct *mm);
-+void __ksm_exit(struct mm_struct *mm);
-+static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
-+{
-+ if (test_bit(MMF_VM_MERGEABLE, &oldmm->flags))
-+ return __ksm_enter(mm);
-+ return 0;
-+}
-+
-+static inline void ksm_exit(struct mm_struct *mm)
-+{
-+ if (test_bit(MMF_VM_MERGEABLE, &mm->flags))
-+ __ksm_exit(mm);
-+}
-+
-+#elif defined(CONFIG_UKSM)
-+static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
-+{
-+ return 0;
-+}
-+
-+static inline void ksm_exit(struct mm_struct *mm)
-+{
-+}
-+#endif /* !CONFIG_UKSM */
-+
- #else /* !CONFIG_KSM */
-
- static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
-@@ -132,4 +144,6 @@ static inline void ksm_migrate_page(struct page *newpage, struct page *oldpage)
- #endif /* CONFIG_MMU */
- #endif /* !CONFIG_KSM */
-
-+#include <linux/uksm.h>
-+
- #endif /* __LINUX_KSM_H */
-diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
-index ace9a5f..6a76d6e 100644
---- a/include/linux/mm_types.h
-+++ b/include/linux/mm_types.h
-@@ -289,6 +289,9 @@ struct vm_area_struct {
- #ifdef CONFIG_NUMA
- struct mempolicy *vm_policy; /* NUMA policy for the VMA */
- #endif
-+#ifdef CONFIG_UKSM
-+ struct vma_slot *uksm_vma_slot;
-+#endif
- };
-
- struct core_thread {
-diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
-index 5c76737..a631b29 100644
---- a/include/linux/mmzone.h
-+++ b/include/linux/mmzone.h
-@@ -143,6 +143,9 @@ enum zone_stat_item {
- #endif
- NR_ANON_TRANSPARENT_HUGEPAGES,
- NR_FREE_CMA_PAGES,
-+#ifdef CONFIG_UKSM
-+ NR_UKSM_ZERO_PAGES,
-+#endif
- NR_VM_ZONE_STAT_ITEMS };
-
- /*
-@@ -849,7 +852,7 @@ static inline int is_normal_idx(enum zone_type idx)
- }
-
- /**
-- * is_highmem - helper function to quickly check if a struct zone is a
-+ * is_highmem - helper function to quickly check if a struct zone is a
- * highmem zone or not. This is an attempt to keep references
- * to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum.
- * @zone - pointer to struct zone variable
-diff --git a/include/linux/sradix-tree.h b/include/linux/sradix-tree.h
-new file mode 100644
-index 0000000..6780fdb
---- /dev/null
-+++ b/include/linux/sradix-tree.h
-@@ -0,0 +1,77 @@
-+#ifndef _LINUX_SRADIX_TREE_H
-+#define _LINUX_SRADIX_TREE_H
-+
-+
-+#define INIT_SRADIX_TREE(root, mask) \
-+do { \
-+ (root)->height = 0; \
-+ (root)->gfp_mask = (mask); \
-+ (root)->rnode = NULL; \
-+} while (0)
-+
-+#define ULONG_BITS (sizeof(unsigned long) * 8)
-+#define SRADIX_TREE_INDEX_BITS (8 /* CHAR_BIT */ * sizeof(unsigned long))
-+//#define SRADIX_TREE_MAP_SHIFT 6
-+//#define SRADIX_TREE_MAP_SIZE (1UL << SRADIX_TREE_MAP_SHIFT)
-+//#define SRADIX_TREE_MAP_MASK (SRADIX_TREE_MAP_SIZE-1)
-+
-+struct sradix_tree_node {
-+ unsigned int height; /* Height from the bottom */
-+ unsigned int count;
-+ unsigned int fulls; /* Number of full sublevel trees */
-+ struct sradix_tree_node *parent;
-+ void *stores[0];
-+};
-+
-+/* A simple radix tree implementation */
-+struct sradix_tree_root {
-+ unsigned int height;
-+ struct sradix_tree_node *rnode;
-+
-+ /* Where found to have available empty stores in its sublevels */
-+ struct sradix_tree_node *enter_node;
-+ unsigned int shift;
-+ unsigned int stores_size;
-+ unsigned int mask;
-+ unsigned long min; /* The first hole index */
-+ unsigned long num;
-+ //unsigned long *height_to_maxindex;
-+
-+ /* How the node is allocated and freed. */
-+ struct sradix_tree_node *(*alloc)(void);
-+ void (*free)(struct sradix_tree_node *node);
-+
-+ /* When a new node is added and removed */
-+ void (*extend)(struct sradix_tree_node *parent, struct sradix_tree_node *child);
-+ void (*assign)(struct sradix_tree_node *node, unsigned index, void *item);
-+ void (*rm)(struct sradix_tree_node *node, unsigned offset);
-+};
-+
-+struct sradix_tree_path {
-+ struct sradix_tree_node *node;
-+ int offset;
-+};
-+
-+static inline
-+void init_sradix_tree_root(struct sradix_tree_root *root, unsigned long shift)
-+{
-+ root->height = 0;
-+ root->rnode = NULL;
-+ root->shift = shift;
-+ root->stores_size = 1UL << shift;
-+ root->mask = root->stores_size - 1;
-+}
-+
-+
-+extern void *sradix_tree_next(struct sradix_tree_root *root,
-+ struct sradix_tree_node *node, unsigned long index,
-+ int (*iter)(void *, unsigned long));
-+
-+extern int sradix_tree_enter(struct sradix_tree_root *root, void **item, int num);
-+
-+extern void sradix_tree_delete_from_leaf(struct sradix_tree_root *root,
-+ struct sradix_tree_node *node, unsigned long index);
-+
-+extern void *sradix_tree_lookup(struct sradix_tree_root *root, unsigned long index);
-+
-+#endif /* _LINUX_SRADIX_TREE_H */
-diff --git a/include/linux/uksm.h b/include/linux/uksm.h
-new file mode 100644
-index 0000000..a644bca
---- /dev/null
-+++ b/include/linux/uksm.h
-@@ -0,0 +1,146 @@
-+#ifndef __LINUX_UKSM_H
-+#define __LINUX_UKSM_H
-+/*
-+ * Memory merging support.
-+ *
-+ * This code enables dynamic sharing of identical pages found in different
-+ * memory areas, even if they are not shared by fork().
-+ */
-+
-+/* if !CONFIG_UKSM this file should not be compiled at all. */
-+#ifdef CONFIG_UKSM
-+
-+#include <linux/bitops.h>
-+#include <linux/mm.h>
-+#include <linux/pagemap.h>
-+#include <linux/rmap.h>
-+#include <linux/sched.h>
-+
-+extern unsigned long zero_pfn __read_mostly;
-+extern unsigned long uksm_zero_pfn __read_mostly;
-+extern struct page *empty_uksm_zero_page;
-+
-+/* must be done before linked to mm */
-+extern void uksm_vma_add_new(struct vm_area_struct *vma);
-+extern void uksm_remove_vma(struct vm_area_struct *vma);
-+
-+#define UKSM_SLOT_NEED_SORT (1 << 0)
-+#define UKSM_SLOT_NEED_RERAND (1 << 1)
-+#define UKSM_SLOT_SCANNED (1 << 2) /* It's scanned in this round */
-+#define UKSM_SLOT_FUL_SCANNED (1 << 3)
-+#define UKSM_SLOT_IN_UKSM (1 << 4)
-+
-+struct vma_slot {
-+ struct sradix_tree_node *snode;
-+ unsigned long sindex;
-+
-+ struct list_head slot_list;
-+ unsigned long fully_scanned_round;
-+ unsigned long dedup_num;
-+ unsigned long pages_scanned;
-+ unsigned long last_scanned;
-+ unsigned long pages_to_scan;
-+ struct scan_rung *rung;
-+ struct page **rmap_list_pool;
-+ unsigned int *pool_counts;
-+ unsigned long pool_size;
-+ struct vm_area_struct *vma;
-+ struct mm_struct *mm;
-+ unsigned long ctime_j;
-+ unsigned long pages;
-+ unsigned long flags;
-+ unsigned long pages_cowed; /* pages cowed this round */
-+ unsigned long pages_merged; /* pages merged this round */
-+ unsigned long pages_bemerged;
-+
-+ /* when it has page merged in this eval round */
-+ struct list_head dedup_list;
-+};
-+
-+static inline void uksm_unmap_zero_page(pte_t pte)
-+{
-+ if (pte_pfn(pte) == uksm_zero_pfn)
-+ __dec_zone_page_state(empty_uksm_zero_page, NR_UKSM_ZERO_PAGES);
-+}
-+
-+static inline void uksm_map_zero_page(pte_t pte)
-+{
-+ if (pte_pfn(pte) == uksm_zero_pfn)
-+ __inc_zone_page_state(empty_uksm_zero_page, NR_UKSM_ZERO_PAGES);
-+}
-+
-+static inline void uksm_cow_page(struct vm_area_struct *vma, struct page *page)
-+{
-+ if (vma->uksm_vma_slot && PageKsm(page))
-+ vma->uksm_vma_slot->pages_cowed++;
-+}
-+
-+static inline void uksm_cow_pte(struct vm_area_struct *vma, pte_t pte)
-+{
-+ if (vma->uksm_vma_slot && pte_pfn(pte) == uksm_zero_pfn)
-+ vma->uksm_vma_slot->pages_cowed++;
-+}
-+
-+static inline int uksm_flags_can_scan(unsigned long vm_flags)
-+{
-+#ifndef VM_SAO
-+#define VM_SAO 0
-+#endif
-+ return !(vm_flags & (VM_PFNMAP | VM_IO | VM_DONTEXPAND |
-+ VM_HUGETLB | VM_NONLINEAR | VM_MIXEDMAP |
-+ VM_SHARED | VM_MAYSHARE | VM_GROWSUP | VM_GROWSDOWN | VM_SAO));
-+}
-+
-+static inline void uksm_vm_flags_mod(unsigned long *vm_flags_p)
-+{
-+ if (uksm_flags_can_scan(*vm_flags_p))
-+ *vm_flags_p |= VM_MERGEABLE;
-+}
-+
-+/*
-+ * Just a wrapper for BUG_ON for where ksm_zeropage must not be. TODO: it will
-+ * be removed when uksm zero page patch is stable enough.
-+ */
-+static inline void uksm_bugon_zeropage(pte_t pte)
-+{
-+ BUG_ON(pte_pfn(pte) == uksm_zero_pfn);
-+}
-+#else
-+static inline void uksm_vma_add_new(struct vm_area_struct *vma)
-+{
-+}
-+
-+static inline void uksm_remove_vma(struct vm_area_struct *vma)
-+{
-+}
-+
-+static inline void uksm_unmap_zero_page(pte_t pte)
-+{
-+}
-+
-+static inline void uksm_map_zero_page(pte_t pte)
-+{
-+}
-+
-+static inline void uksm_cow_page(struct vm_area_struct *vma, struct page *page)
-+{
-+}
-+
-+static inline void uksm_cow_pte(struct vm_area_struct *vma, pte_t pte)
-+{
-+}
-+
-+static inline int uksm_flags_can_scan(unsigned long vm_flags)
-+{
-+ return 0;
-+}
-+
-+static inline void uksm_vm_flags_mod(unsigned long *vm_flags_p)
-+{
-+}
-+
-+static inline void uksm_bugon_zeropage(pte_t pte)
-+{
-+}
-+#endif /* !CONFIG_UKSM */
-+#endif /* __LINUX_UKSM_H */
-diff --git a/kernel/fork.c b/kernel/fork.c
-index 987b28a..3e89974 100644
---- a/kernel/fork.c
-+++ b/kernel/fork.c
-@@ -397,7 +397,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
- goto fail_nomem;
- charge = len;
- }
-- tmp = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
-+ tmp = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
- if (!tmp)
- goto fail_nomem;
- *tmp = *mpnt;
-@@ -454,7 +454,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
- __vma_link_rb(mm, tmp, rb_link, rb_parent);
- rb_link = &tmp->vm_rb.rb_right;
- rb_parent = &tmp->vm_rb;
--
-+ uksm_vma_add_new(tmp);
- mm->map_count++;
- retval = copy_page_range(mm, oldmm, mpnt);
-
-diff --git a/lib/Makefile b/lib/Makefile
-index c55a037..fcf7e6d 100644
---- a/lib/Makefile
-+++ b/lib/Makefile
-@@ -8,7 +8,7 @@ KBUILD_CFLAGS = $(subst -pg,,$(ORIG_CFLAGS))
- endif
-
- lib-y := ctype.o string.o vsprintf.o cmdline.o \
-- rbtree.o radix-tree.o dump_stack.o timerqueue.o\
-+ rbtree.o radix-tree.o sradix-tree.o dump_stack.o timerqueue.o\
- idr.o int_sqrt.o extable.o \
- sha1.o md5.o irq_regs.o reciprocal_div.o argv_split.o \
- proportions.o flex_proportions.o prio_heap.o ratelimit.o show_mem.o \
-diff --git a/lib/sradix-tree.c b/lib/sradix-tree.c
-new file mode 100644
-index 0000000..8d06329
---- /dev/null
-+++ b/lib/sradix-tree.c
-@@ -0,0 +1,476 @@
-+#include <linux/errno.h>
-+#include <linux/mm.h>
-+#include <linux/mman.h>
-+#include <linux/spinlock.h>
-+#include <linux/slab.h>
-+#include <linux/gcd.h>
-+#include <linux/sradix-tree.h>
-+
-+static inline int sradix_node_full(struct sradix_tree_root *root, struct sradix_tree_node *node)
-+{
-+ return node->fulls == root->stores_size ||
-+ (node->height == 1 && node->count == root->stores_size);
-+}
-+
-+/*
-+ * Extend a sradix tree so it can store key @index.
-+ */
-+static int sradix_tree_extend(struct sradix_tree_root *root, unsigned long index)
-+{
-+ struct sradix_tree_node *node;
-+ unsigned int height;
-+
-+ if (unlikely(root->rnode == NULL)) {
-+ if (!(node = root->alloc()))
-+ return -ENOMEM;
-+
-+ node->height = 1;
-+ root->rnode = node;
-+ root->height = 1;
-+ }
-+
-+ /* Figure out what the height should be. */
-+ height = root->height;
-+ index >>= root->shift * height;
-+
-+ while (index) {
-+ index >>= root->shift;
-+ height++;
-+ }
-+
-+ while (height > root->height) {
-+ unsigned int newheight;
-+ if (!(node = root->alloc()))
-+ return -ENOMEM;
-+
-+ /* Increase the height. */
-+ node->stores[0] = root->rnode;
-+ root->rnode->parent = node;
-+ if (root->extend)
-+ root->extend(node, root->rnode);
-+
-+ newheight = root->height + 1;
-+ node->height = newheight;
-+ node->count = 1;
-+ if (sradix_node_full(root, root->rnode))
-+ node->fulls = 1;
-+
-+ root->rnode = node;
-+ root->height = newheight;
-+ }
-+
-+ return 0;
-+}
-+
-+/*
-+ * Search the next item from the current node, that is not NULL
-+ * and can satify root->iter().
-+ */
-+void *sradix_tree_next(struct sradix_tree_root *root,
-+ struct sradix_tree_node *node, unsigned long index,
-+ int (*iter)(void *item, unsigned long height))
-+{
-+ unsigned long offset;
-+ void *item;
-+
-+ if (unlikely(node == NULL)) {
-+ node = root->rnode;
-+ for (offset = 0; offset < root->stores_size; offset++) {
-+ item = node->stores[offset];
-+ if (item && (!iter || iter(item, node->height)))
-+ break;
-+ }
-+
-+ if (unlikely(offset >= root->stores_size))
-+ return NULL;
-+
-+ if (node->height == 1)
-+ return item;
-+ else
-+ goto go_down;
-+ }
-+
-+ while (node) {
-+ offset = (index & root->mask) + 1;
-+ for (;offset < root->stores_size; offset++) {
-+ item = node->stores[offset];
-+ if (item && (!iter || iter(item, node->height)))
-+ break;
-+ }
-+
-+ if (offset < root->stores_size)
-+ break;
-+
-+ node = node->parent;
-+ index >>= root->shift;
-+ }
-+
-+ if (!node)
-+ return NULL;
-+
-+ while (node->height > 1) {
-+go_down:
-+ node = item;
-+ for (offset = 0; offset < root->stores_size; offset++) {
-+ item = node->stores[offset];
-+ if (item && (!iter || iter(item, node->height)))
-+ break;
-+ }
-+
-+ if (unlikely(offset >= root->stores_size))
-+ return NULL;
-+ }
-+
-+ BUG_ON(offset > root->stores_size);
-+
-+ return item;
-+}
-+
-+/*
-+ * Blindly insert the item to the tree. Typically, we reuse the
-+ * first empty store item.
-+ */
-+int sradix_tree_enter(struct sradix_tree_root *root, void **item, int num)
-+{
-+ unsigned long index;
-+ unsigned int height;
-+ struct sradix_tree_node *node, *tmp = NULL;
-+ int offset, offset_saved;
-+ void **store = NULL;
-+ int error, i, j, shift;
-+
-+go_on:
-+ index = root->min;
-+
-+ if (root->enter_node && !sradix_node_full(root, root->enter_node)) {
-+ node = root->enter_node;
-+ BUG_ON((index >> (root->shift * root->height)));
-+ } else {
-+ node = root->rnode;
-+ if (node == NULL || (index >> (root->shift * root->height))
-+ || sradix_node_full(root, node)) {
-+ error = sradix_tree_extend(root, index);
-+ if (error)
-+ return error;
-+
-+ node = root->rnode;
-+ }
-+ }
-+
-+
-+ height = node->height;
-+ shift = (height - 1) * root->shift;
-+ offset = (index >> shift) & root->mask;
-+ while (shift > 0) {
-+ offset_saved = offset;
-+ for (; offset < root->stores_size; offset++) {
-+ store = &node->stores[offset];
-+ tmp = *store;
-+
-+ if (!tmp || !sradix_node_full(root, tmp))
-+ break;
-+ }
-+ BUG_ON(offset >= root->stores_size);
-+
-+ if (offset != offset_saved) {
-+ index += (offset - offset_saved) << shift;
-+ index &= ~((1UL << shift) - 1);
-+ }
-+
-+ if (!tmp) {
-+ if (!(tmp = root->alloc()))
-+ return -ENOMEM;
-+
-+ tmp->height = shift / root->shift;
-+ *store = tmp;
-+ tmp->parent = node;
-+ node->count++;
-+// if (root->extend)
-+// root->extend(node, tmp);
-+ }
-+
-+ node = tmp;
-+ shift -= root->shift;
-+ offset = (index >> shift) & root->mask;
-+ }
-+
-+ BUG_ON(node->height != 1);
-+
-+
-+ store = &node->stores[offset];
-+ for (i = 0, j = 0;
-+ j < root->stores_size - node->count &&
-+ i < root->stores_size - offset && j < num; i++) {
-+ if (!store[i]) {
-+ store[i] = item[j];
-+ if (root->assign)
-+ root->assign(node, index + i, item[j]);
-+ j++;
-+ }
-+ }
-+
-+ node->count += j;
-+ root->num += j;
-+ num -= j;
-+
-+ while (sradix_node_full(root, node)) {
-+ node = node->parent;
-+ if (!node)
-+ break;
-+
-+ node->fulls++;
-+ }
-+
-+ if (unlikely(!node)) {
-+ /* All nodes are full */
-+ root->min = 1 << (root->height * root->shift);
-+ root->enter_node = NULL;
-+ } else {
-+ root->min = index + i - 1;
-+ root->min |= (1UL << (node->height - 1)) - 1;
-+ root->min++;
-+ root->enter_node = node;
-+ }
-+
-+ if (num) {
-+ item += j;
-+ goto go_on;
-+ }
-+
-+ return 0;
-+}
-+
-+
-+/**
-+ * sradix_tree_shrink - shrink height of a sradix tree to minimal
-+ * @root sradix tree root
-+ *
-+ */
-+static inline void sradix_tree_shrink(struct sradix_tree_root *root)
-+{
-+ /* try to shrink tree height */
-+ while (root->height > 1) {
-+ struct sradix_tree_node *to_free = root->rnode;
-+
-+ /*
-+ * The candidate node has more than one child, or its child
-+ * is not at the leftmost store, we cannot shrink.
-+ */
-+ if (to_free->count != 1 || !to_free->stores[0])
-+ break;
-+
-+ root->rnode = to_free->stores[0];
-+ root->rnode->parent = NULL;
-+ root->height--;
-+ if (unlikely(root->enter_node == to_free)) {
-+ root->enter_node = NULL;
-+ }
-+ root->free(to_free);
-+ }
-+}
-+
-+/*
-+ * Del the item on the known leaf node and index
-+ */
-+void sradix_tree_delete_from_leaf(struct sradix_tree_root *root,
-+ struct sradix_tree_node *node, unsigned long index)
-+{
-+ unsigned int offset;
-+ struct sradix_tree_node *start, *end;
-+
-+ BUG_ON(node->height != 1);
-+
-+ start = node;
-+ while (node && !(--node->count))
-+ node = node->parent;
-+
-+ end = node;
-+ if (!node) {
-+ root->rnode = NULL;
-+ root->height = 0;
-+ root->min = 0;
-+ root->num = 0;
-+ root->enter_node = NULL;
-+ } else {
-+ offset = (index >> (root->shift * (node->height - 1))) & root->mask;
-+ if (root->rm)
-+ root->rm(node, offset);
-+ node->stores[offset] = NULL;
-+ root->num--;
-+ if (root->min > index) {
-+ root->min = index;
-+ root->enter_node = node;
-+ }
-+ }
-+
-+ if (start != end) {
-+ do {
-+ node = start;
-+ start = start->parent;
-+ if (unlikely(root->enter_node == node))
-+ root->enter_node = end;
-+ root->free(node);
-+ } while (start != end);
-+
-+ /*
-+ * Note that shrink may free "end", so enter_node still need to
-+ * be checked inside.
-+ */
-+ sradix_tree_shrink(root);
-+ } else if (node->count == root->stores_size - 1) {
-+ /* It WAS a full leaf node. Update the ancestors */
-+ node = node->parent;
-+ while (node) {
-+ node->fulls--;
-+ if (node->fulls != root->stores_size - 1)
-+ break;
-+
-+ node = node->parent;
-+ }
-+ }
-+}
-+
-+void *sradix_tree_lookup(struct sradix_tree_root *root, unsigned long index)
-+{
-+ unsigned int height, offset;
-+ struct sradix_tree_node *node;
-+ int shift;
-+
-+ node = root->rnode;
-+ if (node == NULL || (index >> (root->shift * root->height)))
-+ return NULL;
-+
-+ height = root->height;
-+ shift = (height - 1) * root->shift;
-+
-+ do {
-+ offset = (index >> shift) & root->mask;
-+ node = node->stores[offset];
-+ if (!node)
-+ return NULL;
-+
-+ shift -= root->shift;
-+ } while (shift >= 0);
-+
-+ return node;
-+}
-+
-+/*
-+ * Return the item if it exists, otherwise create it in place
-+ * and return the created item.
-+ */
-+void *sradix_tree_lookup_create(struct sradix_tree_root *root,
-+ unsigned long index, void *(*item_alloc)(void))
-+{
-+ unsigned int height, offset;
-+ struct sradix_tree_node *node, *tmp;
-+ void *item;
-+ int shift, error;
-+
-+ if (root->rnode == NULL || (index >> (root->shift * root->height))) {
-+ if (item_alloc) {
-+ error = sradix_tree_extend(root, index);
-+ if (error)
-+ return NULL;
-+ } else {
-+ return NULL;
-+ }
-+ }
-+
-+ node = root->rnode;
-+ height = root->height;
-+ shift = (height - 1) * root->shift;
-+
-+ do {
-+ offset = (index >> shift) & root->mask;
-+ if (!node->stores[offset]) {
-+ if (!(tmp = root->alloc()))
-+ return NULL;
-+
-+ tmp->height = shift / root->shift;
-+ node->stores[offset] = tmp;
-+ tmp->parent = node;
-+ node->count++;
-+ node = tmp;
-+ } else {
-+ node = node->stores[offset];
-+ }
-+
-+ shift -= root->shift;
-+ } while (shift > 0);
-+
-+ BUG_ON(node->height != 1);
-+ offset = index & root->mask;
-+ if (node->stores[offset]) {
-+ return node->stores[offset];
-+ } else if (item_alloc) {
-+ if (!(item = item_alloc()))
-+ return NULL;
-+
-+ node->stores[offset] = item;
-+
-+ /*
-+ * NOTE: we do NOT call root->assign here, since this item is
-+ * newly created by us having no meaning. Caller can call this
-+ * if it's necessary to do so.
-+ */
-+
-+ node->count++;
-+ root->num++;
-+
-+ while (sradix_node_full(root, node)) {
-+ node = node->parent;
-+ if (!node)
-+ break;
-+
-+ node->fulls++;
-+ }
-+
-+ if (unlikely(!node)) {
-+ /* All nodes are full */
-+ root->min = 1 << (root->height * root->shift);
-+ } else {
-+ if (root->min == index) {
-+ root->min |= (1UL << (node->height - 1)) - 1;
-+ root->min++;
-+ root->enter_node = node;
-+ }
-+ }
-+
-+ return item;
-+ } else {
-+ return NULL;
-+ }
-+
-+}
-+
-+int sradix_tree_delete(struct sradix_tree_root *root, unsigned long index)
-+{
-+ unsigned int height, offset;
-+ struct sradix_tree_node *node;
-+ int shift;
-+
-+ node = root->rnode;
-+ if (node == NULL || (index >> (root->shift * root->height)))
-+ return -ENOENT;
-+
-+ height = root->height;
-+ shift = (height - 1) * root->shift;
-+
-+ do {
-+ offset = (index >> shift) & root->mask;
-+ node = node->stores[offset];
-+ if (!node)
-+ return -ENOENT;
-+
-+ shift -= root->shift;
-+ } while (shift > 0);
-+
-+ offset = index & root->mask;
-+ if (!node->stores[offset])
-+ return -ENOENT;
-+
-+ sradix_tree_delete_from_leaf(root, node, index);
-+
-+ return 0;
-+}
-diff --git a/mm/Kconfig b/mm/Kconfig
-index e742d06..93c2533 100644
---- a/mm/Kconfig
-+++ b/mm/Kconfig
-@@ -315,6 +315,32 @@ config KSM
- See Documentation/vm/ksm.txt for more information: KSM is inactive
- until a program has madvised that an area is MADV_MERGEABLE, and
- root has set /sys/kernel/mm/ksm/run to 1 (if CONFIG_SYSFS is set).
-+choice
-+ prompt "Choose UKSM/KSM strategy"
-+ default UKSM
-+ depends on KSM
-+ help
-+ This option allows to select a UKSM/KSM stragety.
-+
-+config UKSM
-+ bool "Ultra-KSM for page merging"
-+ depends on KSM
-+ help
-+ UKSM is inspired by the Linux kernel project \u2014 KSM(Kernel Same
-+ page Merging), but with a fundamentally rewritten core algorithm. With
-+ an advanced algorithm, UKSM now can transparently scans all anonymously
-+ mapped user space applications with an significantly improved scan speed
-+ and CPU efficiency. Since KVM is friendly to KSM, KVM can also benefit from
-+ UKSM. Now UKSM has its first stable release and first real world enterprise user.
-+ For more information, please goto its project page.
-+ (www.kerneldedup.org)
-+
-+config KSM_LEGACY
-+ bool "Legacy KSM implementation"
-+ depends on KSM
-+ help
-+ The legacy KSM implementation from Redhat.
-+endchoice
-
- config DEFAULT_MMAP_MIN_ADDR
- int "Low address space to protect from user allocation"
-diff --git a/mm/Makefile b/mm/Makefile
-index 72c5acb..77882b7 100644
---- a/mm/Makefile
-+++ b/mm/Makefile
-@@ -39,7 +39,8 @@ obj-$(CONFIG_SPARSEMEM) += sparse.o
- obj-$(CONFIG_SPARSEMEM_VMEMMAP) += sparse-vmemmap.o
- obj-$(CONFIG_SLOB) += slob.o
- obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
--obj-$(CONFIG_KSM) += ksm.o
-+obj-$(CONFIG_KSM_LEGACY) += ksm.o
-+obj-$(CONFIG_UKSM) += uksm.o
- obj-$(CONFIG_PAGE_POISONING) += debug-pagealloc.o
- obj-$(CONFIG_SLAB) += slab.o
- obj-$(CONFIG_SLUB) += slub.o
-diff --git a/mm/memory.c b/mm/memory.c
-index 61a262b..a506b9d 100644
---- a/mm/memory.c
-+++ b/mm/memory.c
-@@ -118,6 +118,27 @@ __setup("norandmaps", disable_randmaps);
- unsigned long zero_pfn __read_mostly;
- unsigned long highest_memmap_pfn __read_mostly;
-
-+#ifdef CONFIG_UKSM
-+unsigned long uksm_zero_pfn __read_mostly;
-+struct page *empty_uksm_zero_page;
-+
-+static int __init setup_uksm_zero_page(void)
-+{
-+ unsigned long addr;
-+ addr = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
-+ if (!addr)
-+ panic("Oh boy, that early out of memory?");
-+
-+ empty_uksm_zero_page = virt_to_page((void *) addr);
-+ SetPageReserved(empty_uksm_zero_page);
-+
-+ uksm_zero_pfn = page_to_pfn(empty_uksm_zero_page);
-+
-+ return 0;
-+}
-+core_initcall(setup_uksm_zero_page);
-+#endif
-+
- /*
- * CONFIG_MMU architectures set up ZERO_PAGE in their paging_init()
- */
-@@ -129,6 +150,7 @@ static int __init init_zero_pfn(void)
- core_initcall(init_zero_pfn);
-
-
-+
- #if defined(SPLIT_RSS_COUNTING)
-
- void sync_mm_rss(struct mm_struct *mm)
-@@ -896,6 +918,11 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
- rss[MM_ANONPAGES]++;
- else
- rss[MM_FILEPAGES]++;
-+
-+ /* Should return NULL in vm_normal_page() */
-+ uksm_bugon_zeropage(pte);
-+ } else {
-+ uksm_map_zero_page(pte);
- }
-
- out_set_pte:
-@@ -1138,8 +1165,10 @@ again:
- ptent = ptep_get_and_clear_full(mm, addr, pte,
- tlb->fullmm);
- tlb_remove_tlb_entry(tlb, pte, addr);
-- if (unlikely(!page))
-+ if (unlikely(!page)) {
-+ uksm_unmap_zero_page(ptent);
- continue;
-+ }
- if (unlikely(details) && details->nonlinear_vma
- && linear_page_index(details->nonlinear_vma,
- addr) != page->index)
-@@ -1704,7 +1733,7 @@ long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
-
- VM_BUG_ON(!!pages != !!(gup_flags & FOLL_GET));
-
-- /*
-+ /*
- * Require read or write permissions.
- * If FOLL_FORCE is set, we only require the "MAY" flags.
- */
-@@ -1764,7 +1793,7 @@ long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
- page = vm_normal_page(vma, start, *pte);
- if (!page) {
- if (!(gup_flags & FOLL_DUMP) &&
-- is_zero_pfn(pte_pfn(*pte)))
-+ (is_zero_pfn(pte_pfn(*pte))))
- page = pte_page(*pte);
- else {
- pte_unmap(pte);
-@@ -2579,8 +2608,10 @@ static inline void cow_user_page(struct page *dst, struct page *src, unsigned lo
- clear_page(kaddr);
- kunmap_atomic(kaddr);
- flush_dcache_page(dst);
-- } else
-+ } else {
- copy_user_highpage(dst, src, va, vma);
-+ uksm_cow_page(vma, src);
-+ }
- }
-
- /*
-@@ -2779,6 +2810,7 @@ gotten:
- new_page = alloc_zeroed_user_highpage_movable(vma, address);
- if (!new_page)
- goto oom;
-+ uksm_cow_pte(vma, orig_pte);
- } else {
- new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
- if (!new_page)
-@@ -2804,8 +2836,11 @@ gotten:
- dec_mm_counter_fast(mm, MM_FILEPAGES);
- inc_mm_counter_fast(mm, MM_ANONPAGES);
- }
-- } else
-+ uksm_bugon_zeropage(orig_pte);
-+ } else {
-+ uksm_unmap_zero_page(orig_pte);
- inc_mm_counter_fast(mm, MM_ANONPAGES);
-+ }
- flush_cache_page(vma, address, pte_pfn(orig_pte));
- entry = mk_pte(new_page, vma->vm_page_prot);
- entry = maybe_mkwrite(pte_mkdirty(entry), vma);
-diff --git a/mm/mmap.c b/mm/mmap.c
-index f681e18..31ef952 100644
---- a/mm/mmap.c
-+++ b/mm/mmap.c
-@@ -36,6 +36,7 @@
- #include <linux/sched/sysctl.h>
- #include <linux/notifier.h>
- #include <linux/memory.h>
-+#include <linux/ksm.h>
-
- #include <asm/uaccess.h>
- #include <asm/cacheflush.h>
-@@ -65,7 +66,7 @@ static void unmap_region(struct mm_struct *mm,
- * MAP_SHARED r: (no) no r: (yes) yes r: (no) yes r: (no) yes
- * w: (no) no w: (no) no w: (yes) yes w: (no) no
- * x: (no) no x: (no) yes x: (no) yes x: (yes) yes
-- *
-+ *
- * MAP_PRIVATE r: (no) no r: (yes) yes r: (no) yes r: (no) yes
- * w: (no) no w: (no) no w: (copy) copy w: (no) no
- * x: (no) no x: (no) yes x: (no) yes x: (yes) yes
-@@ -252,6 +253,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma)
- if (vma->vm_file)
- fput(vma->vm_file);
- mpol_put(vma_policy(vma));
-+ uksm_remove_vma(vma);
- kmem_cache_free(vm_area_cachep, vma);
- return next;
- }
-@@ -707,9 +709,16 @@ int vma_adjust(struct vm_area_struct *vma, unsigned long start,
- long adjust_next = 0;
- int remove_next = 0;
-
-+/*
-+ * to avoid deadlock, ksm_remove_vma must be done before any spin_lock is
-+ * acquired
-+ */
-+ uksm_remove_vma(vma);
-+
- if (next && !insert) {
- struct vm_area_struct *exporter = NULL;
-
-+ uksm_remove_vma(next);
- if (end >= next->vm_end) {
- /*
- * vma expands, overlapping all the next, and
-@@ -803,6 +812,7 @@ again: remove_next = 1 + (end > next->vm_end);
- end_changed = true;
- }
- vma->vm_pgoff = pgoff;
-+
- if (adjust_next) {
- next->vm_start += adjust_next << PAGE_SHIFT;
- next->vm_pgoff += adjust_next;
-@@ -873,16 +883,22 @@ again: remove_next = 1 + (end > next->vm_end);
- * up the code too much to do both in one go.
- */
- next = vma->vm_next;
-- if (remove_next == 2)
-+ if (remove_next == 2) {
-+ uksm_remove_vma(next);
- goto again;
-- else if (next)
-+ } else if (next) {
- vma_gap_update(next);
-- else
-+ } else {
- mm->highest_vm_end = end;
-+ }
-+ } else {
-+ if (next && !insert)
-+ uksm_vma_add_new(next);
- }
- if (insert && file)
- uprobe_mmap(insert);
-
-+ uksm_vma_add_new(vma);
- validate_mm(mm);
-
- return 0;
-@@ -1250,6 +1266,9 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
- vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags) |
- mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
-
-+ /* If uksm is enabled, we add VM_MERGABLE to new VMAs. */
-+ uksm_vm_flags_mod(&vm_flags);
-+
- if (flags & MAP_LOCKED)
- if (!can_do_mlock())
- return -EPERM;
-@@ -1595,6 +1614,7 @@ munmap_back:
-
- vma_link(mm, vma, prev, rb_link, rb_parent);
- file = vma->vm_file;
-+ uksm_vma_add_new(vma);
-
- /* Once vma denies write, undo our temporary denial count */
- if (correct_wcount)
-@@ -1626,6 +1646,7 @@ unmap_and_free_vma:
- unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
- charged = 0;
- free_vma:
-+ uksm_remove_vma(vma);
- kmem_cache_free(vm_area_cachep, vma);
- unacct_error:
- if (charged)
-@@ -1874,7 +1895,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
- info.align_mask = 0;
- return vm_unmapped_area(&info);
- }
--#endif
-+#endif
-
- void arch_unmap_area(struct mm_struct *mm, unsigned long addr)
- {
-@@ -2452,6 +2473,8 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma,
- else
- err = vma_adjust(vma, vma->vm_start, addr, vma->vm_pgoff, new);
-
-+ uksm_vma_add_new(new);
-+
- /* Success. */
- if (!err)
- return 0;
-@@ -2617,6 +2640,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len)
- return addr;
-
- flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
-+ uksm_vm_flags_mod(&flags);
-
- error = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED);
- if (error & ~PAGE_MASK)
-@@ -2684,6 +2708,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len)
- vma->vm_flags = flags;
- vma->vm_page_prot = vm_get_page_prot(flags);
- vma_link(mm, vma, prev, rb_link, rb_parent);
-+ uksm_vma_add_new(vma);
- out:
- perf_event_mmap(vma);
- mm->total_vm += len >> PAGE_SHIFT;
-@@ -2718,6 +2743,12 @@ void exit_mmap(struct mm_struct *mm)
- /* mm's last user has gone, and its about to be pulled down */
- mmu_notifier_release(mm);
-
-+ /*
-+ * Taking write lock on mmap_sem does not harm others,
-+ * but it's crucial for uksm to avoid races.
-+ */
-+ down_write(&mm->mmap_sem);
-+
- if (mm->locked_vm) {
- vma = mm->mmap;
- while (vma) {
-@@ -2754,6 +2785,11 @@ void exit_mmap(struct mm_struct *mm)
- }
- vm_unacct_memory(nr_accounted);
-
-+ mm->mmap = NULL;
-+ mm->mm_rb = RB_ROOT;
-+ mm->mmap_cache = NULL;
-+ up_write(&mm->mmap_sem);
-+
- WARN_ON(mm->nr_ptes > (FIRST_USER_ADDRESS+PMD_SIZE-1)>>PMD_SHIFT);
- }
-
-@@ -2864,6 +2900,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
- new_vma->vm_ops->open(new_vma);
- vma_link(mm, new_vma, prev, rb_link, rb_parent);
- *need_rmap_locks = false;
-+ uksm_vma_add_new(new_vma);
- }
- }
- return new_vma;
-@@ -2965,10 +3002,10 @@ int install_special_mapping(struct mm_struct *mm,
- ret = insert_vm_struct(mm, vma);
- if (ret)
- goto out;
--
- mm->total_vm += len >> PAGE_SHIFT;
-
- perf_event_mmap(vma);
-+ uksm_vma_add_new(vma);
-
- return 0;
-
-diff --git a/mm/rmap.c b/mm/rmap.c
-index 6280da8..645cf22 100644
---- a/mm/rmap.c
-+++ b/mm/rmap.c
-@@ -973,9 +973,9 @@ void page_move_anon_rmap(struct page *page,
-
- /**
- * __page_set_anon_rmap - set up new anonymous rmap
-- * @page: Page to add to rmap
-+ * @page: Page to add to rmap
- * @vma: VM area to add page to.
-- * @address: User virtual address of the mapping
-+ * @address: User virtual address of the mapping
- * @exclusive: the page is exclusively owned by the current process
- */
- static void __page_set_anon_rmap(struct page *page,
-diff --git a/mm/uksm.c b/mm/uksm.c
-new file mode 100644
-index 0000000..794867a
---- /dev/null
-+++ b/mm/uksm.c
-@@ -0,0 +1,5640 @@
-+/*
-+ * Ultra KSM. Copyright (C) 2011-2012 Nai Xia
-+ *
-+ * This is an improvement upon KSM. Some basic data structures and routines
-+ * are borrowed from ksm.c .
-+ *
-+ * Its new features:
-+ * 1. Full system scan:
-+ * It automatically scans all user processes' anonymous VMAs. Kernel-user
-+ * interaction to submit a memory area to KSM is no longer needed.
-+ *
-+ * 2. Rich area detection:
-+ * It automatically detects rich areas containing abundant duplicated
-+ * pages based. Rich areas are given a full scan speed. Poor areas are
-+ * sampled at a reasonable speed with very low CPU consumption.
-+ *
-+ * 3. Ultra Per-page scan speed improvement:
-+ * A new hash algorithm is proposed. As a result, on a machine with
-+ * Core(TM)2 Quad Q9300 CPU in 32-bit mode and 800MHZ DDR2 main memory, it
-+ * can scan memory areas that does not contain duplicated pages at speed of
-+ * 627MB/sec ~ 2445MB/sec and can merge duplicated areas at speed of
-+ * 477MB/sec ~ 923MB/sec.
-+ *
-+ * 4. Thrashing area avoidance:
-+ * Thrashing area(an VMA that has frequent Ksm page break-out) can be
-+ * filtered out. My benchmark shows it's more efficient than KSM's per-page
-+ * hash value based volatile page detection.
-+ *
-+ *
-+ * 5. Misc changes upon KSM:
-+ * * It has a fully x86-opitmized memcmp dedicated for 4-byte-aligned page
-+ * comparison. It's much faster than default C version on x86.
-+ * * rmap_item now has an struct *page member to loosely cache a
-+ * address-->page mapping, which reduces too much time-costly
-+ * follow_page().
-+ * * The VMA creation/exit procedures are hooked to let the Ultra KSM know.
-+ * * try_to_merge_two_pages() now can revert a pte if it fails. No break_
-+ * ksm is needed for this case.
-+ *
-+ * 6. Full Zero Page consideration(contributed by Figo Zhang)
-+ * Now uksmd consider full zero pages as special pages and merge them to an
-+ * special unswappable uksm zero page.
-+ */
-+
-+#include <linux/errno.h>
-+#include <linux/mm.h>
-+#include <linux/fs.h>
-+#include <linux/mman.h>
-+#include <linux/sched.h>
-+#include <linux/rwsem.h>
-+#include <linux/pagemap.h>
-+#include <linux/rmap.h>
-+#include <linux/spinlock.h>
-+#include <linux/jhash.h>
-+#include <linux/delay.h>
-+#include <linux/kthread.h>
-+#include <linux/wait.h>
-+#include <linux/slab.h>
-+#include <linux/rbtree.h>
-+#include <linux/memory.h>
-+#include <linux/mmu_notifier.h>
-+#include <linux/swap.h>
-+#include <linux/ksm.h>
-+#include <linux/crypto.h>
-+#include <linux/scatterlist.h>
-+#include <crypto/hash.h>
-+#include <linux/random.h>
-+#include <linux/math64.h>
-+#include <linux/gcd.h>
-+#include <linux/freezer.h>
-+#include <linux/sradix-tree.h>
-+
-+#include <asm/tlbflush.h>
-+#include "internal.h"
-+
-+#ifdef CONFIG_X86
-+#undef memcmp
-+
-+#ifdef CONFIG_X86_32
-+#define memcmp memcmpx86_32
-+/*
-+ * Compare 4-byte-aligned address s1 and s2, with length n
-+ */
-+int memcmpx86_32(void *s1, void *s2, size_t n)
-+{
-+ size_t num = n / 4;
-+ register int res;
-+
-+ __asm__ __volatile__
-+ (
-+ "testl %3,%3\n\t"
-+ "repe; cmpsd\n\t"
-+ "je 1f\n\t"
-+ "sbbl %0,%0\n\t"
-+ "orl $1,%0\n"
-+ "1:"
-+ : "=&a" (res), "+&S" (s1), "+&D" (s2), "+&c" (num)
-+ : "0" (0)
-+ : "cc");
-+
-+ return res;
-+}
-+
-+/*
-+ * Check the page is all zero ?
-+ */
-+static int is_full_zero(const void *s1, size_t len)
-+{
-+ unsigned char same;
-+
-+ len /= 4;
-+
-+ __asm__ __volatile__
-+ ("repe; scasl;"
-+ "sete %0"
-+ : "=qm" (same), "+D" (s1), "+c" (len)
-+ : "a" (0)
-+ : "cc");
-+
-+ return same;
-+}
-+
-+
-+#elif defined(CONFIG_X86_64)
-+#define memcmp memcmpx86_64
-+/*
-+ * Compare 8-byte-aligned address s1 and s2, with length n
-+ */
-+int memcmpx86_64(void *s1, void *s2, size_t n)
-+{
-+ size_t num = n / 8;
-+ register int res;
-+
-+ __asm__ __volatile__
-+ (
-+ "testq %q3,%q3\n\t"
-+ "repe; cmpsq\n\t"
-+ "je 1f\n\t"
-+ "sbbq %q0,%q0\n\t"
-+ "orq $1,%q0\n"
-+ "1:"
-+ : "=&a" (res), "+&S" (s1), "+&D" (s2), "+&c" (num)
-+ : "0" (0)
-+ : "cc");
-+
-+ return res;
-+}
-+
-+static int is_full_zero(const void *s1, size_t len)
-+{
-+ unsigned char same;
-+
-+ len /= 8;
-+
-+ __asm__ __volatile__
-+ ("repe; scasq;"
-+ "sete %0"
-+ : "=qm" (same), "+D" (s1), "+c" (len)
-+ : "a" (0)
-+ : "cc");
-+
-+ return same;
-+}
-+
-+#endif
-+#else
-+static int is_full_zero(const void *s1, size_t len)
-+{
-+ unsigned long *src = s1;
-+ int i;
-+
-+ len /= sizeof(*src);
-+
-+ for (i = 0; i < len; i++) {
-+ if (src[i])
-+ return 0;
-+ }
-+
-+ return 1;
-+}
-+#endif
-+
-+#define U64_MAX (~((u64)0))
-+#define UKSM_RUNG_ROUND_FINISHED (1 << 0)
-+#define TIME_RATIO_SCALE 10000
-+
-+#define SLOT_TREE_NODE_SHIFT 8
-+#define SLOT_TREE_NODE_STORE_SIZE (1UL << SLOT_TREE_NODE_SHIFT)
-+struct slot_tree_node {
-+ unsigned long size;
-+ struct sradix_tree_node snode;
-+ void *stores[SLOT_TREE_NODE_STORE_SIZE];
-+};
-+
-+static struct kmem_cache *slot_tree_node_cachep;
-+
-+static struct sradix_tree_node *slot_tree_node_alloc(void)
-+{
-+ struct slot_tree_node *p;
-+ p = kmem_cache_zalloc(slot_tree_node_cachep, GFP_KERNEL);
-+ if (!p)
-+ return NULL;
-+
-+ return &p->snode;
-+}
-+
-+static void slot_tree_node_free(struct sradix_tree_node *node)
-+{
-+ struct slot_tree_node *p;
-+
-+ p = container_of(node, struct slot_tree_node, snode);
-+ kmem_cache_free(slot_tree_node_cachep, p);
-+}
-+
-+static void slot_tree_node_extend(struct sradix_tree_node *parent,
-+ struct sradix_tree_node *child)
-+{
-+ struct slot_tree_node *p, *c;
-+
-+ p = container_of(parent, struct slot_tree_node, snode);
-+ c = container_of(child, struct slot_tree_node, snode);
-+
-+ p->size += c->size;
-+}
-+
-+void slot_tree_node_assign(struct sradix_tree_node *node,
-+ unsigned index, void *item)
-+{
-+ struct vma_slot *slot = item;
-+ struct slot_tree_node *cur;
-+
-+ slot->snode = node;
-+ slot->sindex = index;
-+
-+ while (node) {
-+ cur = container_of(node, struct slot_tree_node, snode);
-+ cur->size += slot->pages;
-+ node = node->parent;
-+ }
-+}
-+
-+void slot_tree_node_rm(struct sradix_tree_node *node, unsigned offset)
-+{
-+ struct vma_slot *slot;
-+ struct slot_tree_node *cur;
-+ unsigned long pages;
-+
-+ if (node->height == 1) {
-+ slot = node->stores[offset];
-+ pages = slot->pages;
-+ } else {
-+ cur = container_of(node->stores[offset],
-+ struct slot_tree_node, snode);
-+ pages = cur->size;
-+ }
-+
-+ while (node) {
-+ cur = container_of(node, struct slot_tree_node, snode);
-+ cur->size -= pages;
-+ node = node->parent;
-+ }
-+}
-+
-+unsigned long slot_iter_index;
-+int slot_iter(void *item, unsigned long height)
-+{
-+ struct slot_tree_node *node;
-+ struct vma_slot *slot;
-+
-+ if (height == 1) {
-+ slot = item;
-+ if (slot_iter_index < slot->pages) {
-+ /*in this one*/
-+ return 1;
-+ } else {
-+ slot_iter_index -= slot->pages;
-+ return 0;
-+ }
-+
-+ } else {
-+ node = container_of(item, struct slot_tree_node, snode);
-+ if (slot_iter_index < node->size) {
-+ /*in this one*/
-+ return 1;
-+ } else {
-+ slot_iter_index -= node->size;
-+ return 0;
-+ }
-+ }
-+}
-+
-+
-+static inline void slot_tree_init_root(struct sradix_tree_root *root)
-+{
-+ init_sradix_tree_root(root, SLOT_TREE_NODE_SHIFT);
-+ root->alloc = slot_tree_node_alloc;
-+ root->free = slot_tree_node_free;
-+ root->extend = slot_tree_node_extend;
-+ root->assign = slot_tree_node_assign;
-+ root->rm = slot_tree_node_rm;
-+}
-+
-+void slot_tree_init(void)
-+{
-+ slot_tree_node_cachep = kmem_cache_create("slot_tree_node",
-+ sizeof(struct slot_tree_node), 0,
-+ SLAB_PANIC | SLAB_RECLAIM_ACCOUNT,
-+ NULL);
-+}
-+
-+
-+/* Each rung of this ladder is a list of VMAs having a same scan ratio */
-+struct scan_rung {
-+ //struct list_head scanned_list;
-+ struct sradix_tree_root vma_root;
-+ struct sradix_tree_root vma_root2;
-+
-+ struct vma_slot *current_scan;
-+ unsigned long current_offset;
-+
-+ /*
-+ * The initial value for current_offset, it should loop over
-+ * [0~ step - 1] to let all slot have its chance to be scanned.
-+ */
-+ unsigned long offset_init;
-+ unsigned long step; /* dynamic step for current_offset */
-+ unsigned int flags;
-+ unsigned long pages_to_scan;
-+ //unsigned long fully_scanned_slots;
-+ /*
-+ * a little bit tricky - if cpu_time_ratio > 0, then the value is the
-+ * the cpu time ratio it can spend in rung_i for every scan
-+ * period. if < 0, then it is the cpu time ratio relative to the
-+ * max cpu percentage user specified. Both in unit of
-+ * 1/TIME_RATIO_SCALE
-+ */
-+ int cpu_ratio;
-+
-+ /*
-+ * How long it will take for all slots in this rung to be fully
-+ * scanned? If it's zero, we don't care about the cover time:
-+ * it's fully scanned.
-+ */
-+ unsigned int cover_msecs;
-+ //unsigned long vma_num;
-+ //unsigned long pages; /* Sum of all slot's pages in rung */
-+};
-+
-+/**
-+ * node of either the stable or unstale rbtree
-+ *
-+ */
-+struct tree_node {
-+ struct rb_node node; /* link in the main (un)stable rbtree */
-+ struct rb_root sub_root; /* rb_root for sublevel collision rbtree */
-+ u32 hash;
-+ unsigned long count; /* TODO: merged with sub_root */
-+ struct list_head all_list; /* all tree nodes in stable/unstable tree */
-+};
-+
-+/**
-+ * struct stable_node - node of the stable rbtree
-+ * @node: rb node of this ksm page in the stable tree
-+ * @hlist: hlist head of rmap_items using this ksm page
-+ * @kpfn: page frame number of this ksm page
-+ */
-+struct stable_node {
-+ struct rb_node node; /* link in sub-rbtree */
-+ struct tree_node *tree_node; /* it's tree node root in stable tree, NULL if it's in hell list */
-+ struct hlist_head hlist;
-+ unsigned long kpfn;
-+ u32 hash_max; /* if ==0 then it's not been calculated yet */
-+ struct list_head all_list; /* in a list for all stable nodes */
-+};
-+
-+/**
-+ * struct node_vma - group rmap_items linked in a same stable
-+ * node together.
-+ */
-+struct node_vma {
-+ union {
-+ struct vma_slot *slot;
-+ unsigned long key; /* slot is used as key sorted on hlist */
-+ };
-+ struct hlist_node hlist;
-+ struct hlist_head rmap_hlist;
-+ struct stable_node *head;
-+};
-+
-+/**
-+ * struct rmap_item - reverse mapping item for virtual addresses
-+ * @rmap_list: next rmap_item in mm_slot's singly-linked rmap_list
-+ * @anon_vma: pointer to anon_vma for this mm,address, when in stable tree
-+ * @mm: the memory structure this rmap_item is pointing into
-+ * @address: the virtual address this rmap_item tracks (+ flags in low bits)
-+ * @node: rb node of this rmap_item in the unstable tree
-+ * @head: pointer to stable_node heading this list in the stable tree
-+ * @hlist: link into hlist of rmap_items hanging off that stable_node
-+ */
-+struct rmap_item {
-+ struct vma_slot *slot;
-+ struct page *page;
-+ unsigned long address; /* + low bits used for flags below */
-+ unsigned long hash_round;
-+ unsigned long entry_index;
-+ union {
-+ struct {/* when in unstable tree */
-+ struct rb_node node;
-+ struct tree_node *tree_node;
-+ u32 hash_max;
-+ };
-+ struct { /* when in stable tree */
-+ struct node_vma *head;
-+ struct hlist_node hlist;
-+ struct anon_vma *anon_vma;
-+ };
-+ };
-+} __attribute__((aligned(4)));
-+
-+struct rmap_list_entry {
-+ union {
-+ struct rmap_item *item;
-+ unsigned long addr;
-+ };
-+ /* lowest bit is used for is_addr tag */
-+} __attribute__((aligned(4))); /* 4 aligned to fit in to pages*/
-+
-+
-+/* Basic data structure definition ends */
-+
-+
-+/*
-+ * Flags for rmap_item to judge if it's listed in the stable/unstable tree.
-+ * The flags use the low bits of rmap_item.address
-+ */
-+#define UNSTABLE_FLAG 0x1
-+#define STABLE_FLAG 0x2
-+#define get_rmap_addr(x) ((x)->address & PAGE_MASK)
-+
-+/*
-+ * rmap_list_entry helpers
-+ */
-+#define IS_ADDR_FLAG 1
-+#define is_addr(ptr) ((unsigned long)(ptr) & IS_ADDR_FLAG)
-+#define set_is_addr(ptr) ((ptr) |= IS_ADDR_FLAG)
-+#define get_clean_addr(ptr) (((ptr) & ~(__typeof__(ptr))IS_ADDR_FLAG))
-+
-+
-+/*
-+ * High speed caches for frequently allocated and freed structs
-+ */
-+static struct kmem_cache *rmap_item_cache;
-+static struct kmem_cache *stable_node_cache;
-+static struct kmem_cache *node_vma_cache;
-+static struct kmem_cache *vma_slot_cache;
-+static struct kmem_cache *tree_node_cache;
-+#define UKSM_KMEM_CACHE(__struct, __flags) kmem_cache_create("uksm_"#__struct,\
-+ sizeof(struct __struct), __alignof__(struct __struct),\
-+ (__flags), NULL)
-+
-+/* Array of all scan_rung, uksm_scan_ladder[0] having the minimum scan ratio */
-+#define SCAN_LADDER_SIZE 4
-+static struct scan_rung uksm_scan_ladder[SCAN_LADDER_SIZE];
-+
-+/* The evaluation rounds uksmd has finished */
-+static unsigned long long uksm_eval_round = 1;
-+
-+/*
-+ * we add 1 to this var when we consider we should rebuild the whole
-+ * unstable tree.
-+ */
-+static unsigned long uksm_hash_round = 1;
-+
-+/*
-+ * How many times the whole memory is scanned.
-+ */
-+static unsigned long long fully_scanned_round = 1;
-+
-+/* The total number of virtual pages of all vma slots */
-+static u64 uksm_pages_total;
-+
-+/* The number of pages has been scanned since the start up */
-+static u64 uksm_pages_scanned;
-+
-+static u64 scanned_virtual_pages;
-+
-+/* The number of pages has been scanned since last encode_benefit call */
-+static u64 uksm_pages_scanned_last;
-+
-+/* If the scanned number is tooo large, we encode it here */
-+static u64 pages_scanned_stored;
-+
-+static unsigned long pages_scanned_base;
-+
-+/* The number of nodes in the stable tree */
-+static unsigned long uksm_pages_shared;
-+
-+/* The number of page slots additionally sharing those nodes */
-+static unsigned long uksm_pages_sharing;
-+
-+/* The number of nodes in the unstable tree */
-+static unsigned long uksm_pages_unshared;
-+
-+/*
-+ * Milliseconds ksmd should sleep between scans,
-+ * >= 100ms to be consistent with
-+ * scan_time_to_sleep_msec()
-+ */
-+static unsigned int uksm_sleep_jiffies;
-+
-+/* The real value for the uksmd next sleep */
-+static unsigned int uksm_sleep_real;
-+
-+/* Saved value for user input uksm_sleep_jiffies when it's enlarged */
-+static unsigned int uksm_sleep_saved;
-+
-+/* Max percentage of cpu utilization ksmd can take to scan in one batch */
-+static unsigned int uksm_max_cpu_percentage;
-+
-+static int uksm_cpu_governor;
-+
-+static char *uksm_cpu_governor_str[4] = { "full", "medium", "low", "quiet" };
-+
-+struct uksm_cpu_preset_s {
-+ int cpu_ratio[SCAN_LADDER_SIZE];
-+ unsigned int cover_msecs[SCAN_LADDER_SIZE];
-+ unsigned int max_cpu; /* percentage */
-+};
-+
-+struct uksm_cpu_preset_s uksm_cpu_preset[4] = {
-+ { {20, 40, -2500, -10000}, {1000, 500, 200, 50}, 95},
-+ { {20, 30, -2500, -10000}, {1000, 500, 400, 100}, 50},
-+ { {10, 20, -5000, -10000}, {1500, 1000, 1000, 250}, 20},
-+ { {10, 20, 40, 75}, {2000, 1000, 1000, 1000}, 1},
-+};
-+
-+/* The default value for uksm_ema_page_time if it's not initialized */
-+#define UKSM_PAGE_TIME_DEFAULT 500
-+
-+/*cost to scan one page by expotional moving average in nsecs */
-+static unsigned long uksm_ema_page_time = UKSM_PAGE_TIME_DEFAULT;
-+
-+/* The expotional moving average alpha weight, in percentage. */
-+#define EMA_ALPHA 20
-+
-+/*
-+ * The threshold used to filter out thrashing areas,
-+ * If it == 0, filtering is disabled, otherwise it's the percentage up-bound
-+ * of the thrashing ratio of all areas. Any area with a bigger thrashing ratio
-+ * will be considered as having a zero duplication ratio.
-+ */
-+static unsigned int uksm_thrash_threshold = 50;
-+
-+/* How much dedup ratio is considered to be abundant*/
-+static unsigned int uksm_abundant_threshold = 10;
-+
-+/* All slots having merged pages in this eval round. */
-+struct list_head vma_slot_dedup = LIST_HEAD_INIT(vma_slot_dedup);
-+
-+/* How many times the ksmd has slept since startup */
-+static unsigned long long uksm_sleep_times;
-+
-+#define UKSM_RUN_STOP 0
-+#define UKSM_RUN_MERGE 1
-+static unsigned int uksm_run = 1;
-+
-+static DECLARE_WAIT_QUEUE_HEAD(uksm_thread_wait);
-+static DEFINE_MUTEX(uksm_thread_mutex);
-+
-+/*
-+ * List vma_slot_new is for newly created vma_slot waiting to be added by
-+ * ksmd. If one cannot be added(e.g. due to it's too small), it's moved to
-+ * vma_slot_noadd. vma_slot_del is the list for vma_slot whose corresponding
-+ * VMA has been removed/freed.
-+ */
-+struct list_head vma_slot_new = LIST_HEAD_INIT(vma_slot_new);
-+struct list_head vma_slot_noadd = LIST_HEAD_INIT(vma_slot_noadd);
-+struct list_head vma_slot_del = LIST_HEAD_INIT(vma_slot_del);
-+static DEFINE_SPINLOCK(vma_slot_list_lock);
-+
-+/* The unstable tree heads */
-+static struct rb_root root_unstable_tree = RB_ROOT;
-+
-+/*
-+ * All tree_nodes are in a list to be freed at once when unstable tree is
-+ * freed after each scan round.
-+ */
-+static struct list_head unstable_tree_node_list =
-+ LIST_HEAD_INIT(unstable_tree_node_list);
-+
-+/* List contains all stable nodes */
-+static struct list_head stable_node_list = LIST_HEAD_INIT(stable_node_list);
-+
-+/*
-+ * When the hash strength is changed, the stable tree must be delta_hashed and
-+ * re-structured. We use two set of below structs to speed up the
-+ * re-structuring of stable tree.
-+ */
-+static struct list_head
-+stable_tree_node_list[2] = {LIST_HEAD_INIT(stable_tree_node_list[0]),
-+ LIST_HEAD_INIT(stable_tree_node_list[1])};
-+
-+static struct list_head *stable_tree_node_listp = &stable_tree_node_list[0];
-+static struct rb_root root_stable_tree[2] = {RB_ROOT, RB_ROOT};
-+static struct rb_root *root_stable_treep = &root_stable_tree[0];
-+static unsigned long stable_tree_index;
-+
-+/* The hash strength needed to hash a full page */
-+#define HASH_STRENGTH_FULL (PAGE_SIZE / sizeof(u32))
-+
-+/* The hash strength needed for loop-back hashing */
-+#define HASH_STRENGTH_MAX (HASH_STRENGTH_FULL + 10)
-+
-+/* The random offsets in a page */
-+static u32 *random_nums;
-+
-+/* The hash strength */
-+static unsigned long hash_strength = HASH_STRENGTH_FULL >> 4;
-+
-+/* The delta value each time the hash strength increases or decreases */
-+static unsigned long hash_strength_delta;
-+#define HASH_STRENGTH_DELTA_MAX 5
-+
-+/* The time we have saved due to random_sample_hash */
-+static u64 rshash_pos;
-+
-+/* The time we have wasted due to hash collision */
-+static u64 rshash_neg;
-+
-+struct uksm_benefit {
-+ u64 pos;
-+ u64 neg;
-+ u64 scanned;
-+ unsigned long base;
-+} benefit;
-+
-+/*
-+ * The relative cost of memcmp, compared to 1 time unit of random sample
-+ * hash, this value is tested when ksm module is initialized
-+ */
-+static unsigned long memcmp_cost;
-+
-+static unsigned long rshash_neg_cont_zero;
-+static unsigned long rshash_cont_obscure;
-+
-+/* The possible states of hash strength adjustment heuristic */
-+enum rshash_states {
-+ RSHASH_STILL,
-+ RSHASH_TRYUP,
-+ RSHASH_TRYDOWN,
-+ RSHASH_NEW,
-+ RSHASH_PRE_STILL,
-+};
-+
-+/* The possible direction we are about to adjust hash strength */
-+enum rshash_direct {
-+ GO_UP,
-+ GO_DOWN,
-+ OBSCURE,
-+ STILL,
-+};
-+
-+/* random sampling hash state machine */
-+static struct {
-+ enum rshash_states state;
-+ enum rshash_direct pre_direct;
-+ u8 below_count;
-+ /* Keep a lookup window of size 5, iff above_count/below_count > 3
-+ * in this window we stop trying.
-+ */
-+ u8 lookup_window_index;
-+ u64 stable_benefit;
-+ unsigned long turn_point_down;
-+ unsigned long turn_benefit_down;
-+ unsigned long turn_point_up;
-+ unsigned long turn_benefit_up;
-+ unsigned long stable_point;
-+} rshash_state;
-+
-+/*zero page hash table, hash_strength [0 ~ HASH_STRENGTH_MAX]*/
-+static u32 *zero_hash_table;
-+
-+static inline struct node_vma *alloc_node_vma(void)
-+{
-+ struct node_vma *node_vma;
-+ node_vma = kmem_cache_zalloc(node_vma_cache, GFP_KERNEL);
-+ if (node_vma) {
-+ INIT_HLIST_HEAD(&node_vma->rmap_hlist);
-+ INIT_HLIST_NODE(&node_vma->hlist);
-+ }
-+ return node_vma;
-+}
-+
-+static inline void free_node_vma(struct node_vma *node_vma)
-+{
-+ kmem_cache_free(node_vma_cache, node_vma);
-+}
-+
-+
-+static inline struct vma_slot *alloc_vma_slot(void)
-+{
-+ struct vma_slot *slot;
-+
-+ /*
-+ * In case ksm is not initialized by now.
-+ * Oops, we need to consider the call site of uksm_init() in the future.
-+ */
-+ if (!vma_slot_cache)
-+ return NULL;
-+
-+ slot = kmem_cache_zalloc(vma_slot_cache, GFP_KERNEL);
-+ if (slot) {
-+ INIT_LIST_HEAD(&slot->slot_list);
-+ INIT_LIST_HEAD(&slot->dedup_list);
-+ slot->flags |= UKSM_SLOT_NEED_RERAND;
-+ }
-+ return slot;
-+}
-+
-+static inline void free_vma_slot(struct vma_slot *vma_slot)
-+{
-+ kmem_cache_free(vma_slot_cache, vma_slot);
-+}
-+
-+
-+
-+static inline struct rmap_item *alloc_rmap_item(void)
-+{
-+ struct rmap_item *rmap_item;
-+
-+ rmap_item = kmem_cache_zalloc(rmap_item_cache, GFP_KERNEL);
-+ if (rmap_item) {
-+ /* bug on lowest bit is not clear for flag use */
-+ BUG_ON(is_addr(rmap_item));
-+ }
-+ return rmap_item;
-+}
-+
-+static inline void free_rmap_item(struct rmap_item *rmap_item)
-+{
-+ rmap_item->slot = NULL; /* debug safety */
-+ kmem_cache_free(rmap_item_cache, rmap_item);
-+}
-+
-+static inline struct stable_node *alloc_stable_node(void)
-+{
-+ struct stable_node *node;
-+ node = kmem_cache_alloc(stable_node_cache, GFP_KERNEL | GFP_ATOMIC);
-+ if (!node)
-+ return NULL;
-+
-+ INIT_HLIST_HEAD(&node->hlist);
-+ list_add(&node->all_list, &stable_node_list);
-+ return node;
-+}
-+
-+static inline void free_stable_node(struct stable_node *stable_node)
-+{
-+ list_del(&stable_node->all_list);
-+ kmem_cache_free(stable_node_cache, stable_node);
-+}
-+
-+static inline struct tree_node *alloc_tree_node(struct list_head *list)
-+{
-+ struct tree_node *node;
-+ node = kmem_cache_zalloc(tree_node_cache, GFP_KERNEL | GFP_ATOMIC);
-+ if (!node)
-+ return NULL;
-+
-+ list_add(&node->all_list, list);
-+ return node;
-+}
-+
-+static inline void free_tree_node(struct tree_node *node)
-+{
-+ list_del(&node->all_list);
-+ kmem_cache_free(tree_node_cache, node);
-+}
-+
-+static void uksm_drop_anon_vma(struct rmap_item *rmap_item)
-+{
-+ struct anon_vma *anon_vma = rmap_item->anon_vma;
-+
-+ put_anon_vma(anon_vma);
-+}
-+
-+
-+/**
-+ * Remove a stable node from stable_tree, may unlink from its tree_node and
-+ * may remove its parent tree_node if no other stable node is pending.
-+ *
-+ * @stable_node The node need to be removed
-+ * @unlink_rb Will this node be unlinked from the rbtree?
-+ * @remove_tree_ node Will its tree_node be removed if empty?
-+ */
-+static void remove_node_from_stable_tree(struct stable_node *stable_node,
-+ int unlink_rb, int remove_tree_node)
-+{
-+ struct node_vma *node_vma;
-+ struct rmap_item *rmap_item;
-+ struct hlist_node *n;
-+
-+ if (!hlist_empty(&stable_node->hlist)) {
-+ hlist_for_each_entry_safe(node_vma, n,
-+ &stable_node->hlist, hlist) {
-+ hlist_for_each_entry(rmap_item, &node_vma->rmap_hlist, hlist) {
-+ uksm_pages_sharing--;
-+
-+ uksm_drop_anon_vma(rmap_item);
-+ rmap_item->address &= PAGE_MASK;
-+ }
-+ free_node_vma(node_vma);
-+ cond_resched();
-+ }
-+
-+ /* the last one is counted as shared */
-+ uksm_pages_shared--;
-+ uksm_pages_sharing++;
-+ }
-+
-+ if (stable_node->tree_node && unlink_rb) {
-+ rb_erase(&stable_node->node,
-+ &stable_node->tree_node->sub_root);
-+
-+ if (RB_EMPTY_ROOT(&stable_node->tree_node->sub_root) &&
-+ remove_tree_node) {
-+ rb_erase(&stable_node->tree_node->node,
-+ root_stable_treep);
-+ free_tree_node(stable_node->tree_node);
-+ } else {
-+ stable_node->tree_node->count--;
-+ }
-+ }
-+
-+ free_stable_node(stable_node);
-+}
-+
-+
-+/*
-+ * get_uksm_page: checks if the page indicated by the stable node
-+ * is still its ksm page, despite having held no reference to it.
-+ * In which case we can trust the content of the page, and it
-+ * returns the gotten page; but if the page has now been zapped,
-+ * remove the stale node from the stable tree and return NULL.
-+ *
-+ * You would expect the stable_node to hold a reference to the ksm page.
-+ * But if it increments the page's count, swapping out has to wait for
-+ * ksmd to come around again before it can free the page, which may take
-+ * seconds or even minutes: much too unresponsive. So instead we use a
-+ * "keyhole reference": access to the ksm page from the stable node peeps
-+ * out through its keyhole to see if that page still holds the right key,
-+ * pointing back to this stable node. This relies on freeing a PageAnon
-+ * page to reset its page->mapping to NULL, and relies on no other use of
-+ * a page to put something that might look like our key in page->mapping.
-+ *
-+ * include/linux/pagemap.h page_cache_get_speculative() is a good reference,
-+ * but this is different - made simpler by uksm_thread_mutex being held, but
-+ * interesting for assuming that no other use of the struct page could ever
-+ * put our expected_mapping into page->mapping (or a field of the union which
-+ * coincides with page->mapping). The RCU calls are not for KSM at all, but
-+ * to keep the page_count protocol described with page_cache_get_speculative.
-+ *
-+ * Note: it is possible that get_uksm_page() will return NULL one moment,
-+ * then page the next, if the page is in between page_freeze_refs() and
-+ * page_unfreeze_refs(): this shouldn't be a problem anywhere, the page
-+ * is on its way to being freed; but it is an anomaly to bear in mind.
-+ *
-+ * @unlink_rb: if the removal of this node will firstly unlink from
-+ * its rbtree. stable_node_reinsert will prevent this when restructuring the
-+ * node from its old tree.
-+ *
-+ * @remove_tree_node: if this is the last one of its tree_node, will the
-+ * tree_node be freed ? If we are inserting stable node, this tree_node may
-+ * be reused, so don't free it.
-+ */
-+static struct page *get_uksm_page(struct stable_node *stable_node,
-+ int unlink_rb, int remove_tree_node)
-+{
-+ struct page *page;
-+ void *expected_mapping;
-+
-+ page = pfn_to_page(stable_node->kpfn);
-+ expected_mapping = (void *)stable_node +
-+ (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM);
-+ rcu_read_lock();
-+ if (page->mapping != expected_mapping)
-+ goto stale;
-+ if (!get_page_unless_zero(page))
-+ goto stale;
-+ if (page->mapping != expected_mapping) {
-+ put_page(page);
-+ goto stale;
-+ }
-+ rcu_read_unlock();
-+ return page;
-+stale:
-+ rcu_read_unlock();
-+ remove_node_from_stable_tree(stable_node, unlink_rb, remove_tree_node);
-+
-+ return NULL;
-+}
-+
-+/*
-+ * Removing rmap_item from stable or unstable tree.
-+ * This function will clean the information from the stable/unstable tree.
-+ */
-+static inline void remove_rmap_item_from_tree(struct rmap_item *rmap_item)
-+{
-+ if (rmap_item->address & STABLE_FLAG) {
-+ struct stable_node *stable_node;
-+ struct node_vma *node_vma;
-+ struct page *page;
-+
-+ node_vma = rmap_item->head;
-+ stable_node = node_vma->head;
-+ page = get_uksm_page(stable_node, 1, 1);
-+ if (!page)
-+ goto out;
-+
-+ /*
-+ * page lock is needed because it's racing with
-+ * try_to_unmap_ksm(), etc.
-+ */
-+ lock_page(page);
-+ hlist_del(&rmap_item->hlist);
-+
-+ if (hlist_empty(&node_vma->rmap_hlist)) {
-+ hlist_del(&node_vma->hlist);
-+ free_node_vma(node_vma);
-+ }
-+ unlock_page(page);
-+
-+ put_page(page);
-+ if (hlist_empty(&stable_node->hlist)) {
-+ /* do NOT call remove_node_from_stable_tree() here,
-+ * it's possible for a forked rmap_item not in
-+ * stable tree while the in-tree rmap_items were
-+ * deleted.
-+ */
-+ uksm_pages_shared--;
-+ } else
-+ uksm_pages_sharing--;
-+
-+
-+ uksm_drop_anon_vma(rmap_item);
-+ } else if (rmap_item->address & UNSTABLE_FLAG) {
-+ if (rmap_item->hash_round == uksm_hash_round) {
-+
-+ rb_erase(&rmap_item->node,
-+ &rmap_item->tree_node->sub_root);
-+ if (RB_EMPTY_ROOT(&rmap_item->tree_node->sub_root)) {
-+ rb_erase(&rmap_item->tree_node->node,
-+ &root_unstable_tree);
-+
-+ free_tree_node(rmap_item->tree_node);
-+ } else
-+ rmap_item->tree_node->count--;
-+ }
-+ uksm_pages_unshared--;
-+ }
-+
-+ rmap_item->address &= PAGE_MASK;
-+ rmap_item->hash_max = 0;
-+
-+out:
-+ cond_resched(); /* we're called from many long loops */
-+}
-+
-+static inline int slot_in_uksm(struct vma_slot *slot)
-+{
-+ return list_empty(&slot->slot_list);
-+}
-+
-+/*
-+ * Test if the mm is exiting
-+ */
-+static inline bool uksm_test_exit(struct mm_struct *mm)
-+{
-+ return atomic_read(&mm->mm_users) == 0;
-+}
-+
-+/**
-+ * Need to do two things:
-+ * 1. check if slot was moved to del list
-+ * 2. make sure the mmap_sem is manipulated under valid vma.
-+ *
-+ * My concern here is that in some cases, this may make
-+ * vma_slot_list_lock() waiters to serialized further by some
-+ * sem->wait_lock, can this really be expensive?
-+ *
-+ *
-+ * @return
-+ * 0: if successfully locked mmap_sem
-+ * -ENOENT: this slot was moved to del list
-+ * -EBUSY: vma lock failed
-+ */
-+static int try_down_read_slot_mmap_sem(struct vma_slot *slot)
-+{
-+ struct vm_area_struct *vma;
-+ struct mm_struct *mm;
-+ struct rw_semaphore *sem;
-+
-+ spin_lock(&vma_slot_list_lock);
-+
-+ /* the slot_list was removed and inited from new list, when it enters
-+ * uksm_list. If now it's not empty, then it must be moved to del list
-+ */
-+ if (!slot_in_uksm(slot)) {
-+ spin_unlock(&vma_slot_list_lock);
-+ return -ENOENT;
-+ }
-+
-+ BUG_ON(slot->pages != vma_pages(slot->vma));
-+ /* Ok, vma still valid */
-+ vma = slot->vma;
-+ mm = vma->vm_mm;
-+ sem = &mm->mmap_sem;
-+
-+ if (uksm_test_exit(mm)) {
-+ spin_unlock(&vma_slot_list_lock);
-+ return -ENOENT;
-+ }
-+
-+ if (down_read_trylock(sem)) {
-+ spin_unlock(&vma_slot_list_lock);
-+ return 0;
-+ }
-+
-+ spin_unlock(&vma_slot_list_lock);
-+ return -EBUSY;
-+}
-+
-+static inline unsigned long
-+vma_page_address(struct page *page, struct vm_area_struct *vma)
-+{
-+ pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
-+ unsigned long address;
-+
-+ address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
-+ if (unlikely(address < vma->vm_start || address >= vma->vm_end)) {
-+ /* page should be within @vma mapping range */
-+ return -EFAULT;
-+ }
-+ return address;
-+}
-+
-+
-+/* return 0 on success with the item's mmap_sem locked */
-+static inline int get_mergeable_page_lock_mmap(struct rmap_item *item)
-+{
-+ struct mm_struct *mm;
-+ struct vma_slot *slot = item->slot;
-+ int err = -EINVAL;
-+
-+ struct page *page;
-+
-+ /*
-+ * try_down_read_slot_mmap_sem() returns non-zero if the slot
-+ * has been removed by uksm_remove_vma().
-+ */
-+ if (try_down_read_slot_mmap_sem(slot))
-+ return -EBUSY;
-+
-+ mm = slot->vma->vm_mm;
-+
-+ if (uksm_test_exit(mm))
-+ goto failout_up;
-+
-+ page = item->page;
-+ rcu_read_lock();
-+ if (!get_page_unless_zero(page)) {
-+ rcu_read_unlock();
-+ goto failout_up;
-+ }
-+
-+ /* No need to consider huge page here. */
-+ if (item->slot->vma->anon_vma != page_anon_vma(page) ||
-+ vma_page_address(page, item->slot->vma) != get_rmap_addr(item)) {
-+ /*
-+ * TODO:
-+ * should we release this item becase of its stale page
-+ * mapping?
-+ */
-+ put_page(page);
-+ rcu_read_unlock();
-+ goto failout_up;
-+ }
-+ rcu_read_unlock();
-+ return 0;
-+
-+failout_up:
-+ up_read(&mm->mmap_sem);
-+ return err;
-+}
-+
-+/*
-+ * What kind of VMA is considered ?
-+ */
-+static inline int vma_can_enter(struct vm_area_struct *vma)
-+{
-+ return uksm_flags_can_scan(vma->vm_flags);
-+}
-+
-+/*
-+ * Called whenever a fresh new vma is created A new vma_slot.
-+ * is created and inserted into a global list Must be called.
-+ * after vma is inserted to its mm .
-+ */
-+void uksm_vma_add_new(struct vm_area_struct *vma)
-+{
-+ struct vma_slot *slot;
-+
-+ if (!vma_can_enter(vma)) {
-+ vma->uksm_vma_slot = NULL;
-+ return;
-+ }
-+
-+ slot = alloc_vma_slot();
-+ if (!slot) {
-+ vma->uksm_vma_slot = NULL;
-+ return;
-+ }
-+
-+ vma->uksm_vma_slot = slot;
-+ vma->vm_flags |= VM_MERGEABLE;
-+ slot->vma = vma;
-+ slot->mm = vma->vm_mm;
-+ slot->ctime_j = jiffies;
-+ slot->pages = vma_pages(vma);
-+ spin_lock(&vma_slot_list_lock);
-+ list_add_tail(&slot->slot_list, &vma_slot_new);
-+ spin_unlock(&vma_slot_list_lock);
-+}
-+
-+/*
-+ * Called after vma is unlinked from its mm
-+ */
-+void uksm_remove_vma(struct vm_area_struct *vma)
-+{
-+ struct vma_slot *slot;
-+
-+ if (!vma->uksm_vma_slot)
-+ return;
-+
-+ slot = vma->uksm_vma_slot;
-+ spin_lock(&vma_slot_list_lock);
-+ if (slot_in_uksm(slot)) {
-+ /**
-+ * This slot has been added by ksmd, so move to the del list
-+ * waiting ksmd to free it.
-+ */
-+ list_add_tail(&slot->slot_list, &vma_slot_del);
-+ } else {
-+ /**
-+ * It's still on new list. It's ok to free slot directly.
-+ */
-+ list_del(&slot->slot_list);
-+ free_vma_slot(slot);
-+ }
-+ spin_unlock(&vma_slot_list_lock);
-+ vma->uksm_vma_slot = NULL;
-+}
-+
-+/* 32/3 < they < 32/2 */
-+#define shiftl 8
-+#define shiftr 12
-+
-+#define HASH_FROM_TO(from, to) \
-+for (index = from; index < to; index++) { \
-+ pos = random_nums[index]; \
-+ hash += key[pos]; \
-+ hash += (hash << shiftl); \
-+ hash ^= (hash >> shiftr); \
-+}
-+
-+
-+#define HASH_FROM_DOWN_TO(from, to) \
-+for (index = from - 1; index >= to; index--) { \
-+ hash ^= (hash >> shiftr); \
-+ hash ^= (hash >> (shiftr*2)); \
-+ hash -= (hash << shiftl); \
-+ hash += (hash << (shiftl*2)); \
-+ pos = random_nums[index]; \
-+ hash -= key[pos]; \
-+}
-+
-+/*
-+ * The main random sample hash function.
-+ */
-+static u32 random_sample_hash(void *addr, u32 hash_strength)
-+{
-+ u32 hash = 0xdeadbeef;
-+ int index, pos, loop = hash_strength;
-+ u32 *key = (u32 *)addr;
-+
-+ if (loop > HASH_STRENGTH_FULL)
-+ loop = HASH_STRENGTH_FULL;
-+
-+ HASH_FROM_TO(0, loop);
-+
-+ if (hash_strength > HASH_STRENGTH_FULL) {
-+ loop = hash_strength - HASH_STRENGTH_FULL;
-+ HASH_FROM_TO(0, loop);
-+ }
-+
-+ return hash;
-+}
-+
-+
-+/**
-+ * It's used when hash strength is adjusted
-+ *
-+ * @addr The page's virtual address
-+ * @from The original hash strength
-+ * @to The hash strength changed to
-+ * @hash The hash value generated with "from" hash value
-+ *
-+ * return the hash value
-+ */
-+static u32 delta_hash(void *addr, int from, int to, u32 hash)
-+{
-+ u32 *key = (u32 *)addr;
-+ int index, pos; /* make sure they are int type */
-+
-+ if (to > from) {
-+ if (from >= HASH_STRENGTH_FULL) {
-+ from -= HASH_STRENGTH_FULL;
-+ to -= HASH_STRENGTH_FULL;
-+ HASH_FROM_TO(from, to);
-+ } else if (to <= HASH_STRENGTH_FULL) {
-+ HASH_FROM_TO(from, to);
-+ } else {
-+ HASH_FROM_TO(from, HASH_STRENGTH_FULL);
-+ HASH_FROM_TO(0, to - HASH_STRENGTH_FULL);
-+ }
-+ } else {
-+ if (from <= HASH_STRENGTH_FULL) {
-+ HASH_FROM_DOWN_TO(from, to);
-+ } else if (to >= HASH_STRENGTH_FULL) {
-+ from -= HASH_STRENGTH_FULL;
-+ to -= HASH_STRENGTH_FULL;
-+ HASH_FROM_DOWN_TO(from, to);
-+ } else {
-+ HASH_FROM_DOWN_TO(from - HASH_STRENGTH_FULL, 0);
-+ HASH_FROM_DOWN_TO(HASH_STRENGTH_FULL, to);
-+ }
-+ }
-+
-+ return hash;
-+}
-+
-+
-+
-+
-+#define CAN_OVERFLOW_U64(x, delta) (U64_MAX - (x) < (delta))
-+
-+/**
-+ *
-+ * Called when: rshash_pos or rshash_neg is about to overflow or a scan round
-+ * has finished.
-+ *
-+ * return 0 if no page has been scanned since last call, 1 otherwise.
-+ */
-+static inline int encode_benefit(void)
-+{
-+ u64 scanned_delta, pos_delta, neg_delta;
-+ unsigned long base = benefit.base;
-+
-+ scanned_delta = uksm_pages_scanned - uksm_pages_scanned_last;
-+
-+ if (!scanned_delta)
-+ return 0;
-+
-+ scanned_delta >>= base;
-+ pos_delta = rshash_pos >> base;
-+ neg_delta = rshash_neg >> base;
-+
-+ if (CAN_OVERFLOW_U64(benefit.pos, pos_delta) ||
-+ CAN_OVERFLOW_U64(benefit.neg, neg_delta) ||
-+ CAN_OVERFLOW_U64(benefit.scanned, scanned_delta)) {
-+ benefit.scanned >>= 1;
-+ benefit.neg >>= 1;
-+ benefit.pos >>= 1;
-+ benefit.base++;
-+ scanned_delta >>= 1;
-+ pos_delta >>= 1;
-+ neg_delta >>= 1;
-+ }
-+
-+ benefit.pos += pos_delta;
-+ benefit.neg += neg_delta;
-+ benefit.scanned += scanned_delta;
-+
-+ BUG_ON(!benefit.scanned);
-+
-+ rshash_pos = rshash_neg = 0;
-+ uksm_pages_scanned_last = uksm_pages_scanned;
-+
-+ return 1;
-+}
-+
-+static inline void reset_benefit(void)
-+{
-+ benefit.pos = 0;
-+ benefit.neg = 0;
-+ benefit.base = 0;
-+ benefit.scanned = 0;
-+}
-+
-+static inline void inc_rshash_pos(unsigned long delta)
-+{
-+ if (CAN_OVERFLOW_U64(rshash_pos, delta))
-+ encode_benefit();
-+
-+ rshash_pos += delta;
-+}
-+
-+static inline void inc_rshash_neg(unsigned long delta)
-+{
-+ if (CAN_OVERFLOW_U64(rshash_neg, delta))
-+ encode_benefit();
-+
-+ rshash_neg += delta;
-+}
-+
-+
-+static inline u32 page_hash(struct page *page, unsigned long hash_strength,
-+ int cost_accounting)
-+{
-+ u32 val;
-+ unsigned long delta;
-+
-+ void *addr = kmap_atomic(page);
-+
-+ val = random_sample_hash(addr, hash_strength);
-+ kunmap_atomic(addr);
-+
-+ if (cost_accounting) {
-+ if (HASH_STRENGTH_FULL > hash_strength)
-+ delta = HASH_STRENGTH_FULL - hash_strength;
-+ else
-+ delta = 0;
-+
-+ inc_rshash_pos(delta);
-+ }
-+
-+ return val;
-+}
-+
-+static int memcmp_pages(struct page *page1, struct page *page2,
-+ int cost_accounting)
-+{
-+ char *addr1, *addr2;
-+ int ret;
-+
-+ addr1 = kmap_atomic(page1);
-+ addr2 = kmap_atomic(page2);
-+ ret = memcmp(addr1, addr2, PAGE_SIZE);
-+ kunmap_atomic(addr2);
-+ kunmap_atomic(addr1);
-+
-+ if (cost_accounting)
-+ inc_rshash_neg(memcmp_cost);
-+
-+ return ret;
-+}
-+
-+static inline int pages_identical(struct page *page1, struct page *page2)
-+{
-+ return !memcmp_pages(page1, page2, 0);
-+}
-+
-+static inline int is_page_full_zero(struct page *page)
-+{
-+ char *addr;
-+ int ret;
-+
-+ addr = kmap_atomic(page);
-+ ret = is_full_zero(addr, PAGE_SIZE);
-+ kunmap_atomic(addr);
-+
-+ return ret;
-+}
-+
-+static int write_protect_page(struct vm_area_struct *vma, struct page *page,
-+ pte_t *orig_pte, pte_t *old_pte)
-+{
-+ struct mm_struct *mm = vma->vm_mm;
-+ unsigned long addr;
-+ pte_t *ptep;
-+ spinlock_t *ptl;
-+ int swapped;
-+ int err = -EFAULT;
-+ unsigned long mmun_start; /* For mmu_notifiers */
-+ unsigned long mmun_end; /* For mmu_notifiers */
-+
-+ addr = page_address_in_vma(page, vma);
-+ if (addr == -EFAULT)
-+ goto out;
-+
-+ BUG_ON(PageTransCompound(page));
-+
-+ mmun_start = addr;
-+ mmun_end = addr + PAGE_SIZE;
-+ mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
-+
-+ ptep = page_check_address(page, mm, addr, &ptl, 0);
-+ if (!ptep)
-+ goto out_mn;
-+
-+ if (old_pte)
-+ *old_pte = *ptep;
-+
-+ if (pte_write(*ptep) || pte_dirty(*ptep)) {
-+ pte_t entry;
-+
-+ swapped = PageSwapCache(page);
-+ flush_cache_page(vma, addr, page_to_pfn(page));
-+ /*
-+ * Ok this is tricky, when get_user_pages_fast() run it doesnt
-+ * take any lock, therefore the check that we are going to make
-+ * with the pagecount against the mapcount is racey and
-+ * O_DIRECT can happen right after the check.
-+ * So we clear the pte and flush the tlb before the check
-+ * this assure us that no O_DIRECT can happen after the check
-+ * or in the middle of the check.
-+ */
-+ entry = ptep_clear_flush(vma, addr, ptep);
-+ /*
-+ * Check that no O_DIRECT or similar I/O is in progress on the
-+ * page
-+ */
-+ if (page_mapcount(page) + 1 + swapped != page_count(page)) {
-+ set_pte_at(mm, addr, ptep, entry);
-+ goto out_unlock;
-+ }
-+ if (pte_dirty(entry))
-+ set_page_dirty(page);
-+ entry = pte_mkclean(pte_wrprotect(entry));
-+ set_pte_at_notify(mm, addr, ptep, entry);
-+ }
-+ *orig_pte = *ptep;
-+ err = 0;
-+
-+out_unlock:
-+ pte_unmap_unlock(ptep, ptl);
-+out_mn:
-+ mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
-+out:
-+ return err;
-+}
-+
-+#define MERGE_ERR_PGERR 1 /* the page is invalid cannot continue */
-+#define MERGE_ERR_COLLI 2 /* there is a collision */
-+#define MERGE_ERR_COLLI_MAX 3 /* collision at the max hash strength */
-+#define MERGE_ERR_CHANGED 4 /* the page has changed since last hash */
-+
-+
-+/**
-+ * replace_page - replace page in vma by new ksm page
-+ * @vma: vma that holds the pte pointing to page
-+ * @page: the page we are replacing by kpage
-+ * @kpage: the ksm page we replace page by
-+ * @orig_pte: the original value of the pte
-+ *
-+ * Returns 0 on success, MERGE_ERR_PGERR on failure.
-+ */
-+static int replace_page(struct vm_area_struct *vma, struct page *page,
-+ struct page *kpage, pte_t orig_pte)
-+{
-+ struct mm_struct *mm = vma->vm_mm;
-+ pgd_t *pgd;
-+ pud_t *pud;
-+ pmd_t *pmd;
-+ pte_t *ptep;
-+ spinlock_t *ptl;
-+ pte_t entry;
-+
-+ unsigned long addr;
-+ int err = MERGE_ERR_PGERR;
-+ unsigned long mmun_start; /* For mmu_notifiers */
-+ unsigned long mmun_end; /* For mmu_notifiers */
-+
-+ addr = page_address_in_vma(page, vma);
-+ if (addr == -EFAULT)
-+ goto out;
-+
-+ pgd = pgd_offset(mm, addr);
-+ if (!pgd_present(*pgd))
-+ goto out;
-+
-+ pud = pud_offset(pgd, addr);
-+ if (!pud_present(*pud))
-+ goto out;
-+
-+ pmd = pmd_offset(pud, addr);
-+ BUG_ON(pmd_trans_huge(*pmd));
-+ if (!pmd_present(*pmd))
-+ goto out;
-+
-+ mmun_start = addr;
-+ mmun_end = addr + PAGE_SIZE;
-+ mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
-+
-+ ptep = pte_offset_map_lock(mm, pmd, addr, &ptl);
-+ if (!pte_same(*ptep, orig_pte)) {
-+ pte_unmap_unlock(ptep, ptl);
-+ goto out_mn;
-+ }
-+
-+ flush_cache_page(vma, addr, pte_pfn(*ptep));
-+ ptep_clear_flush(vma, addr, ptep);
-+ entry = mk_pte(kpage, vma->vm_page_prot);
-+
-+ /* special treatment is needed for zero_page */
-+ if ((page_to_pfn(kpage) == uksm_zero_pfn) ||
-+ (page_to_pfn(kpage) == zero_pfn))
-+ entry = pte_mkspecial(entry);
-+ else {
-+ get_page(kpage);
-+ page_add_anon_rmap(kpage, vma, addr);
-+ }
-+
-+ set_pte_at_notify(mm, addr, ptep, entry);
-+
-+ page_remove_rmap(page);
-+ if (!page_mapped(page))
-+ try_to_free_swap(page);
-+ put_page(page);
-+
-+ pte_unmap_unlock(ptep, ptl);
-+ err = 0;
-+out_mn:
-+ mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
-+out:
-+ return err;
-+}
-+
-+
-+/**
-+ * Fully hash a page with HASH_STRENGTH_MAX return a non-zero hash value. The
-+ * zero hash value at HASH_STRENGTH_MAX is used to indicated that its
-+ * hash_max member has not been calculated.
-+ *
-+ * @page The page needs to be hashed
-+ * @hash_old The hash value calculated with current hash strength
-+ *
-+ * return the new hash value calculated at HASH_STRENGTH_MAX
-+ */
-+static inline u32 page_hash_max(struct page *page, u32 hash_old)
-+{
-+ u32 hash_max = 0;
-+ void *addr;
-+
-+ addr = kmap_atomic(page);
-+ hash_max = delta_hash(addr, hash_strength,
-+ HASH_STRENGTH_MAX, hash_old);
-+
-+ kunmap_atomic(addr);
-+
-+ if (!hash_max)
-+ hash_max = 1;
-+
-+ inc_rshash_neg(HASH_STRENGTH_MAX - hash_strength);
-+ return hash_max;
-+}
-+
-+/*
-+ * We compare the hash again, to ensure that it is really a hash collision
-+ * instead of being caused by page write.
-+ */
-+static inline int check_collision(struct rmap_item *rmap_item,
-+ u32 hash)
-+{
-+ int err;
-+ struct page *page = rmap_item->page;
-+
-+ /* if this rmap_item has already been hash_maxed, then the collision
-+ * must appears in the second-level rbtree search. In this case we check
-+ * if its hash_max value has been changed. Otherwise, the collision
-+ * happens in the first-level rbtree search, so we check against it's
-+ * current hash value.
-+ */
-+ if (rmap_item->hash_max) {
-+ inc_rshash_neg(memcmp_cost);
-+ inc_rshash_neg(HASH_STRENGTH_MAX - hash_strength);
-+
-+ if (rmap_item->hash_max == page_hash_max(page, hash))
-+ err = MERGE_ERR_COLLI;
-+ else
-+ err = MERGE_ERR_CHANGED;
-+ } else {
-+ inc_rshash_neg(memcmp_cost + hash_strength);
-+
-+ if (page_hash(page, hash_strength, 0) == hash)
-+ err = MERGE_ERR_COLLI;
-+ else
-+ err = MERGE_ERR_CHANGED;
-+ }
-+
-+ return err;
-+}
-+
-+static struct page *page_trans_compound_anon(struct page *page)
-+{
-+ if (PageTransCompound(page)) {
-+ struct page *head = compound_trans_head(page);
-+ /*
-+ * head may actually be splitted and freed from under
-+ * us but it's ok here.
-+ */
-+ if (PageAnon(head))
-+ return head;
-+ }
-+ return NULL;
-+}
-+
-+static int page_trans_compound_anon_split(struct page *page)
-+{
-+ int ret = 0;
-+ struct page *transhuge_head = page_trans_compound_anon(page);
-+ if (transhuge_head) {
-+ /* Get the reference on the head to split it. */
-+ if (get_page_unless_zero(transhuge_head)) {
-+ /*
-+ * Recheck we got the reference while the head
-+ * was still anonymous.
-+ */
-+ if (PageAnon(transhuge_head))
-+ ret = split_huge_page(transhuge_head);
-+ else
-+ /*
-+ * Retry later if split_huge_page run
-+ * from under us.
-+ */
-+ ret = 1;
-+ put_page(transhuge_head);
-+ } else
-+ /* Retry later if split_huge_page run from under us. */
-+ ret = 1;
-+ }
-+ return ret;
-+}
-+
-+/**
-+ * Try to merge a rmap_item.page with a kpage in stable node. kpage must
-+ * already be a ksm page.
-+ *
-+ * @return 0 if the pages were merged, -EFAULT otherwise.
-+ */
-+static int try_to_merge_with_uksm_page(struct rmap_item *rmap_item,
-+ struct page *kpage, u32 hash)
-+{
-+ struct vm_area_struct *vma = rmap_item->slot->vma;
-+ struct mm_struct *mm = vma->vm_mm;
-+ pte_t orig_pte = __pte(0);
-+ int err = MERGE_ERR_PGERR;
-+ struct page *page;
-+
-+ if (uksm_test_exit(mm))
-+ goto out;
-+
-+ page = rmap_item->page;
-+
-+ if (page == kpage) { /* ksm page forked */
-+ err = 0;
-+ goto out;
-+ }
-+
-+ if (PageTransCompound(page) && page_trans_compound_anon_split(page))
-+ goto out;
-+ BUG_ON(PageTransCompound(page));
-+
-+ if (!PageAnon(page) || !PageKsm(kpage))
-+ goto out;
-+
-+ /*
-+ * We need the page lock to read a stable PageSwapCache in
-+ * write_protect_page(). We use trylock_page() instead of
-+ * lock_page() because we don't want to wait here - we
-+ * prefer to continue scanning and merging different pages,
-+ * then come back to this page when it is unlocked.
-+ */
-+ if (!trylock_page(page))
-+ goto out;
-+ /*
-+ * If this anonymous page is mapped only here, its pte may need
-+ * to be write-protected. If it's mapped elsewhere, all of its
-+ * ptes are necessarily already write-protected. But in either
-+ * case, we need to lock and check page_count is not raised.
-+ */
-+ if (write_protect_page(vma, page, &orig_pte, NULL) == 0) {
-+ if (pages_identical(page, kpage))
-+ err = replace_page(vma, page, kpage, orig_pte);
-+ else
-+ err = check_collision(rmap_item, hash);
-+ }
-+
-+ if ((vma->vm_flags & VM_LOCKED) && kpage && !err) {
-+ munlock_vma_page(page);
-+ if (!PageMlocked(kpage)) {
-+ unlock_page(page);
-+ lock_page(kpage);
-+ mlock_vma_page(kpage);
-+ page = kpage; /* for final unlock */
-+ }
-+ }
-+
-+ unlock_page(page);
-+out:
-+ return err;
-+}
-+
-+
-+
-+/**
-+ * If two pages fail to merge in try_to_merge_two_pages, then we have a chance
-+ * to restore a page mapping that has been changed in try_to_merge_two_pages.
-+ *
-+ * @return 0 on success.
-+ */
-+static int restore_uksm_page_pte(struct vm_area_struct *vma, unsigned long addr,
-+ pte_t orig_pte, pte_t wprt_pte)
-+{
-+ struct mm_struct *mm = vma->vm_mm;
-+ pgd_t *pgd;
-+ pud_t *pud;
-+ pmd_t *pmd;
-+ pte_t *ptep;
-+ spinlock_t *ptl;
-+
-+ int err = -EFAULT;
-+
-+ pgd = pgd_offset(mm, addr);
-+ if (!pgd_present(*pgd))
-+ goto out;
-+
-+ pud = pud_offset(pgd, addr);
-+ if (!pud_present(*pud))
-+ goto out;
-+
-+ pmd = pmd_offset(pud, addr);
-+ if (!pmd_present(*pmd))
-+ goto out;
-+
-+ ptep = pte_offset_map_lock(mm, pmd, addr, &ptl);
-+ if (!pte_same(*ptep, wprt_pte)) {
-+ /* already copied, let it be */
-+ pte_unmap_unlock(ptep, ptl);
-+ goto out;
-+ }
-+
-+ /*
-+ * Good boy, still here. When we still get the ksm page, it does not
-+ * return to the free page pool, there is no way that a pte was changed
-+ * to other page and gets back to this page. And remind that ksm page
-+ * do not reuse in do_wp_page(). So it's safe to restore the original
-+ * pte.
-+ */
-+ flush_cache_page(vma, addr, pte_pfn(*ptep));
-+ ptep_clear_flush(vma, addr, ptep);
-+ set_pte_at_notify(mm, addr, ptep, orig_pte);
-+
-+ pte_unmap_unlock(ptep, ptl);
-+ err = 0;
-+out:
-+ return err;
-+}
-+
-+/**
-+ * try_to_merge_two_pages() - take two identical pages and prepare
-+ * them to be merged into one page(rmap_item->page)
-+ *
-+ * @return 0 if we successfully merged two identical pages into
-+ * one ksm page. MERGE_ERR_COLLI if it's only a hash collision
-+ * search in rbtree. MERGE_ERR_CHANGED if rmap_item has been
-+ * changed since it's hashed. MERGE_ERR_PGERR otherwise.
-+ *
-+ */
-+static int try_to_merge_two_pages(struct rmap_item *rmap_item,
-+ struct rmap_item *tree_rmap_item,
-+ u32 hash)
-+{
-+ pte_t orig_pte1 = __pte(0), orig_pte2 = __pte(0);
-+ pte_t wprt_pte1 = __pte(0), wprt_pte2 = __pte(0);
-+ struct vm_area_struct *vma1 = rmap_item->slot->vma;
-+ struct vm_area_struct *vma2 = tree_rmap_item->slot->vma;
-+ struct page *page = rmap_item->page;
-+ struct page *tree_page = tree_rmap_item->page;
-+ int err = MERGE_ERR_PGERR;
-+ struct address_space *saved_mapping;
-+
-+
-+ if (rmap_item->page == tree_rmap_item->page)
-+ goto out;
-+
-+ if (PageTransCompound(page) && page_trans_compound_anon_split(page))
-+ goto out;
-+ BUG_ON(PageTransCompound(page));
-+
-+ if (PageTransCompound(tree_page) && page_trans_compound_anon_split(tree_page))
-+ goto out;
-+ BUG_ON(PageTransCompound(tree_page));
-+
-+ if (!PageAnon(page) || !PageAnon(tree_page))
-+ goto out;
-+
-+ if (!trylock_page(page))
-+ goto out;
-+
-+
-+ if (write_protect_page(vma1, page, &wprt_pte1, &orig_pte1) != 0) {
-+ unlock_page(page);
-+ goto out;
-+ }
-+
-+ /*
-+ * While we hold page lock, upgrade page from
-+ * PageAnon+anon_vma to PageKsm+NULL stable_node:
-+ * stable_tree_insert() will update stable_node.
-+ */
-+ saved_mapping = page->mapping;
-+ set_page_stable_node(page, NULL);
-+ mark_page_accessed(page);
-+ unlock_page(page);
-+
-+ if (!trylock_page(tree_page))
-+ goto restore_out;
-+
-+ if (write_protect_page(vma2, tree_page, &wprt_pte2, &orig_pte2) != 0) {
-+ unlock_page(tree_page);
-+ goto restore_out;
-+ }
-+
-+ if (pages_identical(page, tree_page)) {
-+ err = replace_page(vma2, tree_page, page, wprt_pte2);
-+ if (err) {
-+ unlock_page(tree_page);
-+ goto restore_out;
-+ }
-+
-+ if ((vma2->vm_flags & VM_LOCKED)) {
-+ munlock_vma_page(tree_page);
-+ if (!PageMlocked(page)) {
-+ unlock_page(tree_page);
-+ lock_page(page);
-+ mlock_vma_page(page);
-+ tree_page = page; /* for final unlock */
-+ }
-+ }
-+
-+ unlock_page(tree_page);
-+
-+ goto out; /* success */
-+
-+ } else {
-+ if (tree_rmap_item->hash_max &&
-+ tree_rmap_item->hash_max == rmap_item->hash_max) {
-+ err = MERGE_ERR_COLLI_MAX;
-+ } else if (page_hash(page, hash_strength, 0) ==
-+ page_hash(tree_page, hash_strength, 0)) {
-+ inc_rshash_neg(memcmp_cost + hash_strength * 2);
-+ err = MERGE_ERR_COLLI;
-+ } else {
-+ err = MERGE_ERR_CHANGED;
-+ }
-+
-+ unlock_page(tree_page);
-+ }
-+
-+restore_out:
-+ lock_page(page);
-+ if (!restore_uksm_page_pte(vma1, get_rmap_addr(rmap_item),
-+ orig_pte1, wprt_pte1))
-+ page->mapping = saved_mapping;
-+
-+ unlock_page(page);
-+out:
-+ return err;
-+}
-+
-+static inline int hash_cmp(u32 new_val, u32 node_val)
-+{
-+ if (new_val > node_val)
-+ return 1;
-+ else if (new_val < node_val)
-+ return -1;
-+ else
-+ return 0;
-+}
-+
-+static inline u32 rmap_item_hash_max(struct rmap_item *item, u32 hash)
-+{
-+ u32 hash_max = item->hash_max;
-+
-+ if (!hash_max) {
-+ hash_max = page_hash_max(item->page, hash);
-+
-+ item->hash_max = hash_max;
-+ }
-+
-+ return hash_max;
-+}
-+
-+
-+
-+/**
-+ * stable_tree_search() - search the stable tree for a page
-+ *
-+ * @item: the rmap_item we are comparing with
-+ * @hash: the hash value of this item->page already calculated
-+ *
-+ * @return the page we have found, NULL otherwise. The page returned has
-+ * been gotten.
-+ */
-+static struct page *stable_tree_search(struct rmap_item *item, u32 hash)
-+{
-+ struct rb_node *node = root_stable_treep->rb_node;
-+ struct tree_node *tree_node;
-+ unsigned long hash_max;
-+ struct page *page = item->page;
-+ struct stable_node *stable_node;
-+
-+ stable_node = page_stable_node(page);
-+ if (stable_node) {
-+ /* ksm page forked, that is
-+ * if (PageKsm(page) && !in_stable_tree(rmap_item))
-+ * it's actually gotten once outside.
-+ */
-+ get_page(page);
-+ return page;
-+ }
-+
-+ while (node) {
-+ int cmp;
-+
-+ tree_node = rb_entry(node, struct tree_node, node);
-+
-+ cmp = hash_cmp(hash, tree_node->hash);
-+
-+ if (cmp < 0)
-+ node = node->rb_left;
-+ else if (cmp > 0)
-+ node = node->rb_right;
-+ else
-+ break;
-+ }
-+
-+ if (!node)
-+ return NULL;
-+
-+ if (tree_node->count == 1) {
-+ stable_node = rb_entry(tree_node->sub_root.rb_node,
-+ struct stable_node, node);
-+ BUG_ON(!stable_node);
-+
-+ goto get_page_out;
-+ }
-+
-+ /*
-+ * ok, we have to search the second
-+ * level subtree, hash the page to a
-+ * full strength.
-+ */
-+ node = tree_node->sub_root.rb_node;
-+ BUG_ON(!node);
-+ hash_max = rmap_item_hash_max(item, hash);
-+
-+ while (node) {
-+ int cmp;
-+
-+ stable_node = rb_entry(node, struct stable_node, node);
-+
-+ cmp = hash_cmp(hash_max, stable_node->hash_max);
-+
-+ if (cmp < 0)
-+ node = node->rb_left;
-+ else if (cmp > 0)
-+ node = node->rb_right;
-+ else
-+ goto get_page_out;
-+ }
-+
-+ return NULL;
-+
-+get_page_out:
-+ page = get_uksm_page(stable_node, 1, 1);
-+ return page;
-+}
-+
-+static int try_merge_rmap_item(struct rmap_item *item,
-+ struct page *kpage,
-+ struct page *tree_page)
-+{
-+ spinlock_t *ptl;
-+ pte_t *ptep;
-+ unsigned long addr;
-+ struct vm_area_struct *vma = item->slot->vma;
-+
-+ addr = get_rmap_addr(item);
-+ ptep = page_check_address(kpage, vma->vm_mm, addr, &ptl, 0);
-+ if (!ptep)
-+ return 0;
-+
-+ if (pte_write(*ptep)) {
-+ /* has changed, abort! */
-+ pte_unmap_unlock(ptep, ptl);
-+ return 0;
-+ }
-+
-+ get_page(tree_page);
-+ page_add_anon_rmap(tree_page, vma, addr);
-+
-+ flush_cache_page(vma, addr, pte_pfn(*ptep));
-+ ptep_clear_flush(vma, addr, ptep);
-+ set_pte_at_notify(vma->vm_mm, addr, ptep,
-+ mk_pte(tree_page, vma->vm_page_prot));
-+
-+ page_remove_rmap(kpage);
-+ put_page(kpage);
-+
-+ pte_unmap_unlock(ptep, ptl);
-+
-+ return 1;
-+}
-+
-+/**
-+ * try_to_merge_with_stable_page() - when two rmap_items need to be inserted
-+ * into stable tree, the page was found to be identical to a stable ksm page,
-+ * this is the last chance we can merge them into one.
-+ *
-+ * @item1: the rmap_item holding the page which we wanted to insert
-+ * into stable tree.
-+ * @item2: the other rmap_item we found when unstable tree search
-+ * @oldpage: the page currently mapped by the two rmap_items
-+ * @tree_page: the page we found identical in stable tree node
-+ * @success1: return if item1 is successfully merged
-+ * @success2: return if item2 is successfully merged
-+ */
-+static void try_merge_with_stable(struct rmap_item *item1,
-+ struct rmap_item *item2,
-+ struct page **kpage,
-+ struct page *tree_page,
-+ int *success1, int *success2)
-+{
-+ struct vm_area_struct *vma1 = item1->slot->vma;
-+ struct vm_area_struct *vma2 = item2->slot->vma;
-+ *success1 = 0;
-+ *success2 = 0;
-+
-+ if (unlikely(*kpage == tree_page)) {
-+ /* I don't think this can really happen */
-+ printk(KERN_WARNING "UKSM: unexpected condition detected in "
-+ "try_merge_with_stable() -- *kpage == tree_page !\n");
-+ *success1 = 1;
-+ *success2 = 1;
-+ return;
-+ }
-+
-+ if (!PageAnon(*kpage) || !PageKsm(*kpage))
-+ goto failed;
-+
-+ if (!trylock_page(tree_page))
-+ goto failed;
-+
-+ /* If the oldpage is still ksm and still pointed
-+ * to in the right place, and still write protected,
-+ * we are confident it's not changed, no need to
-+ * memcmp anymore.
-+ * be ware, we cannot take nested pte locks,
-+ * deadlock risk.
-+ */
-+ if (!try_merge_rmap_item(item1, *kpage, tree_page))
-+ goto unlock_failed;
-+
-+ /* ok, then vma2, remind that pte1 already set */
-+ if (!try_merge_rmap_item(item2, *kpage, tree_page))
-+ goto success_1;
-+
-+ *success2 = 1;
-+success_1:
-+ *success1 = 1;
-+
-+
-+ if ((*success1 && vma1->vm_flags & VM_LOCKED) ||
-+ (*success2 && vma2->vm_flags & VM_LOCKED)) {
-+ munlock_vma_page(*kpage);
-+ if (!PageMlocked(tree_page))
-+ mlock_vma_page(tree_page);
-+ }
-+
-+ /*
-+ * We do not need oldpage any more in the caller, so can break the lock
-+ * now.
-+ */
-+ unlock_page(*kpage);
-+ *kpage = tree_page; /* Get unlocked outside. */
-+ return;
-+
-+unlock_failed:
-+ unlock_page(tree_page);
-+failed:
-+ return;
-+}
-+
-+static inline void stable_node_hash_max(struct stable_node *node,
-+ struct page *page, u32 hash)
-+{
-+ u32 hash_max = node->hash_max;
-+
-+ if (!hash_max) {
-+ hash_max = page_hash_max(page, hash);
-+ node->hash_max = hash_max;
-+ }
-+}
-+
-+static inline
-+struct stable_node *new_stable_node(struct tree_node *tree_node,
-+ struct page *kpage, u32 hash_max)
-+{
-+ struct stable_node *new_stable_node;
-+
-+ new_stable_node = alloc_stable_node();
-+ if (!new_stable_node)
-+ return NULL;
-+
-+ new_stable_node->kpfn = page_to_pfn(kpage);
-+ new_stable_node->hash_max = hash_max;
-+ new_stable_node->tree_node = tree_node;
-+ set_page_stable_node(kpage, new_stable_node);
-+
-+ return new_stable_node;
-+}
-+
-+static inline
-+struct stable_node *first_level_insert(struct tree_node *tree_node,
-+ struct rmap_item *rmap_item,
-+ struct rmap_item *tree_rmap_item,
-+ struct page **kpage, u32 hash,
-+ int *success1, int *success2)
-+{
-+ int cmp;
-+ struct page *tree_page;
-+ u32 hash_max = 0;
-+ struct stable_node *stable_node, *new_snode;
-+ struct rb_node *parent = NULL, **new;
-+
-+ /* this tree node contains no sub-tree yet */
-+ stable_node = rb_entry(tree_node->sub_root.rb_node,
-+ struct stable_node, node);
-+
-+ tree_page = get_uksm_page(stable_node, 1, 0);
-+ if (tree_page) {
-+ cmp = memcmp_pages(*kpage, tree_page, 1);
-+ if (!cmp) {
-+ try_merge_with_stable(rmap_item, tree_rmap_item, kpage,
-+ tree_page, success1, success2);
-+ put_page(tree_page);
-+ if (!*success1 && !*success2)
-+ goto failed;
-+
-+ return stable_node;
-+
-+ } else {
-+ /*
-+ * collision in first level try to create a subtree.
-+ * A new node need to be created.
-+ */
-+ put_page(tree_page);
-+
-+ stable_node_hash_max(stable_node, tree_page,
-+ tree_node->hash);
-+ hash_max = rmap_item_hash_max(rmap_item, hash);
-+ cmp = hash_cmp(hash_max, stable_node->hash_max);
-+
-+ parent = &stable_node->node;
-+ if (cmp < 0) {
-+ new = &parent->rb_left;
-+ } else if (cmp > 0) {
-+ new = &parent->rb_right;
-+ } else {
-+ goto failed;
-+ }
-+ }
-+
-+ } else {
-+ /* the only stable_node deleted, we reuse its tree_node.
-+ */
-+ parent = NULL;
-+ new = &tree_node->sub_root.rb_node;
-+ }
-+
-+ new_snode = new_stable_node(tree_node, *kpage, hash_max);
-+ if (!new_snode)
-+ goto failed;
-+
-+ rb_link_node(&new_snode->node, parent, new);
-+ rb_insert_color(&new_snode->node, &tree_node->sub_root);
-+ tree_node->count++;
-+ *success1 = *success2 = 1;
-+
-+ return new_snode;
-+
-+failed:
-+ return NULL;
-+}
-+
-+static inline
-+struct stable_node *stable_subtree_insert(struct tree_node *tree_node,
-+ struct rmap_item *rmap_item,
-+ struct rmap_item *tree_rmap_item,
-+ struct page **kpage, u32 hash,
-+ int *success1, int *success2)
-+{
-+ struct page *tree_page;
-+ u32 hash_max;
-+ struct stable_node *stable_node, *new_snode;
-+ struct rb_node *parent, **new;
-+
-+research:
-+ parent = NULL;
-+ new = &tree_node->sub_root.rb_node;
-+ BUG_ON(!*new);
-+ hash_max = rmap_item_hash_max(rmap_item, hash);
-+ while (*new) {
-+ int cmp;
-+
-+ stable_node = rb_entry(*new, struct stable_node, node);
-+
-+ cmp = hash_cmp(hash_max, stable_node->hash_max);
-+
-+ if (cmp < 0) {
-+ parent = *new;
-+ new = &parent->rb_left;
-+ } else if (cmp > 0) {
-+ parent = *new;
-+ new = &parent->rb_right;
-+ } else {
-+ tree_page = get_uksm_page(stable_node, 1, 0);
-+ if (tree_page) {
-+ cmp = memcmp_pages(*kpage, tree_page, 1);
-+ if (!cmp) {
-+ try_merge_with_stable(rmap_item,
-+ tree_rmap_item, kpage,
-+ tree_page, success1, success2);
-+
-+ put_page(tree_page);
-+ if (!*success1 && !*success2)
-+ goto failed;
-+ /*
-+ * successfully merged with a stable
-+ * node
-+ */
-+ return stable_node;
-+ } else {
-+ put_page(tree_page);
-+ goto failed;
-+ }
-+ } else {
-+ /*
-+ * stable node may be deleted,
-+ * and subtree maybe
-+ * restructed, cannot
-+ * continue, research it.
-+ */
-+ if (tree_node->count) {
-+ goto research;
-+ } else {
-+ /* reuse the tree node*/
-+ parent = NULL;
-+ new = &tree_node->sub_root.rb_node;
-+ }
-+ }
-+ }
-+ }
-+
-+ new_snode = new_stable_node(tree_node, *kpage, hash_max);
-+ if (!new_snode)
-+ goto failed;
-+
-+ rb_link_node(&new_snode->node, parent, new);
-+ rb_insert_color(&new_snode->node, &tree_node->sub_root);
-+ tree_node->count++;
-+ *success1 = *success2 = 1;
-+
-+ return new_snode;
-+
-+failed:
-+ return NULL;
-+}
-+
-+
-+/**
-+ * stable_tree_insert() - try to insert a merged page in unstable tree to
-+ * the stable tree
-+ *
-+ * @kpage: the page need to be inserted
-+ * @hash: the current hash of this page
-+ * @rmap_item: the rmap_item being scanned
-+ * @tree_rmap_item: the rmap_item found on unstable tree
-+ * @success1: return if rmap_item is merged
-+ * @success2: return if tree_rmap_item is merged
-+ *
-+ * @return the stable_node on stable tree if at least one
-+ * rmap_item is inserted into stable tree, NULL
-+ * otherwise.
-+ */
-+static struct stable_node *
-+stable_tree_insert(struct page **kpage, u32 hash,
-+ struct rmap_item *rmap_item,
-+ struct rmap_item *tree_rmap_item,
-+ int *success1, int *success2)
-+{
-+ struct rb_node **new = &root_stable_treep->rb_node;
-+ struct rb_node *parent = NULL;
-+ struct stable_node *stable_node;
-+ struct tree_node *tree_node;
-+ u32 hash_max = 0;
-+
-+ *success1 = *success2 = 0;
-+
-+ while (*new) {
-+ int cmp;
-+
-+ tree_node = rb_entry(*new, struct tree_node, node);
-+
-+ cmp = hash_cmp(hash, tree_node->hash);
-+
-+ if (cmp < 0) {
-+ parent = *new;
-+ new = &parent->rb_left;
-+ } else if (cmp > 0) {
-+ parent = *new;
-+ new = &parent->rb_right;
-+ } else
-+ break;
-+ }
-+
-+ if (*new) {
-+ if (tree_node->count == 1) {
-+ stable_node = first_level_insert(tree_node, rmap_item,
-+ tree_rmap_item, kpage,
-+ hash, success1, success2);
-+ } else {
-+ stable_node = stable_subtree_insert(tree_node,
-+ rmap_item, tree_rmap_item, kpage,
-+ hash, success1, success2);
-+ }
-+ } else {
-+
-+ /* no tree node found */
-+ tree_node = alloc_tree_node(stable_tree_node_listp);
-+ if (!tree_node) {
-+ stable_node = NULL;
-+ goto out;
-+ }
-+
-+ stable_node = new_stable_node(tree_node, *kpage, hash_max);
-+ if (!stable_node) {
-+ free_tree_node(tree_node);
-+ goto out;
-+ }
-+
-+ tree_node->hash = hash;
-+ rb_link_node(&tree_node->node, parent, new);
-+ rb_insert_color(&tree_node->node, root_stable_treep);
-+ parent = NULL;
-+ new = &tree_node->sub_root.rb_node;
-+
-+ rb_link_node(&stable_node->node, parent, new);
-+ rb_insert_color(&stable_node->node, &tree_node->sub_root);
-+ tree_node->count++;
-+ *success1 = *success2 = 1;
-+ }
-+
-+out:
-+ return stable_node;
-+}
-+
-+
-+/**
-+ * get_tree_rmap_item_page() - try to get the page and lock the mmap_sem
-+ *
-+ * @return 0 on success, -EBUSY if unable to lock the mmap_sem,
-+ * -EINVAL if the page mapping has been changed.
-+ */
-+static inline int get_tree_rmap_item_page(struct rmap_item *tree_rmap_item)
-+{
-+ int err;
-+
-+ err = get_mergeable_page_lock_mmap(tree_rmap_item);
-+
-+ if (err == -EINVAL) {
-+ /* its page map has been changed, remove it */
-+ remove_rmap_item_from_tree(tree_rmap_item);
-+ }
-+
-+ /* The page is gotten and mmap_sem is locked now. */
-+ return err;
-+}
-+
-+
-+/**
-+ * unstable_tree_search_insert() - search an unstable tree rmap_item with the
-+ * same hash value. Get its page and trylock the mmap_sem
-+ */
-+static inline
-+struct rmap_item *unstable_tree_search_insert(struct rmap_item *rmap_item,
-+ u32 hash)
-+
-+{
-+ struct rb_node **new = &root_unstable_tree.rb_node;
-+ struct rb_node *parent = NULL;
-+ struct tree_node *tree_node;
-+ u32 hash_max;
-+ struct rmap_item *tree_rmap_item;
-+
-+ while (*new) {
-+ int cmp;
-+
-+ tree_node = rb_entry(*new, struct tree_node, node);
-+
-+ cmp = hash_cmp(hash, tree_node->hash);
-+
-+ if (cmp < 0) {
-+ parent = *new;
-+ new = &parent->rb_left;
-+ } else if (cmp > 0) {
-+ parent = *new;
-+ new = &parent->rb_right;
-+ } else
-+ break;
-+ }
-+
-+ if (*new) {
-+ /* got the tree_node */
-+ if (tree_node->count == 1) {
-+ tree_rmap_item = rb_entry(tree_node->sub_root.rb_node,
-+ struct rmap_item, node);
-+ BUG_ON(!tree_rmap_item);
-+
-+ goto get_page_out;
-+ }
-+
-+ /* well, search the collision subtree */
-+ new = &tree_node->sub_root.rb_node;
-+ BUG_ON(!*new);
-+ hash_max = rmap_item_hash_max(rmap_item, hash);
-+
-+ while (*new) {
-+ int cmp;
-+
-+ tree_rmap_item = rb_entry(*new, struct rmap_item,
-+ node);
-+
-+ cmp = hash_cmp(hash_max, tree_rmap_item->hash_max);
-+ parent = *new;
-+ if (cmp < 0)
-+ new = &parent->rb_left;
-+ else if (cmp > 0)
-+ new = &parent->rb_right;
-+ else
-+ goto get_page_out;
-+ }
-+ } else {
-+ /* alloc a new tree_node */
-+ tree_node = alloc_tree_node(&unstable_tree_node_list);
-+ if (!tree_node)
-+ return NULL;
-+
-+ tree_node->hash = hash;
-+ rb_link_node(&tree_node->node, parent, new);
-+ rb_insert_color(&tree_node->node, &root_unstable_tree);
-+ parent = NULL;
-+ new = &tree_node->sub_root.rb_node;
-+ }
-+
-+ /* did not found even in sub-tree */
-+ rmap_item->tree_node = tree_node;
-+ rmap_item->address |= UNSTABLE_FLAG;
-+ rmap_item->hash_round = uksm_hash_round;
-+ rb_link_node(&rmap_item->node, parent, new);
-+ rb_insert_color(&rmap_item->node, &tree_node->sub_root);
-+
-+ uksm_pages_unshared++;
-+ return NULL;
-+
-+get_page_out:
-+ if (tree_rmap_item->page == rmap_item->page)
-+ return NULL;
-+
-+ if (get_tree_rmap_item_page(tree_rmap_item))
-+ return NULL;
-+
-+ return tree_rmap_item;
-+}
-+
-+static void hold_anon_vma(struct rmap_item *rmap_item,
-+ struct anon_vma *anon_vma)
-+{
-+ rmap_item->anon_vma = anon_vma;
-+ get_anon_vma(anon_vma);
-+}
-+
-+
-+/**
-+ * stable_tree_append() - append a rmap_item to a stable node. Deduplication
-+ * ratio statistics is done in this function.
-+ *
-+ */
-+static void stable_tree_append(struct rmap_item *rmap_item,
-+ struct stable_node *stable_node, int logdedup)
-+{
-+ struct node_vma *node_vma = NULL, *new_node_vma, *node_vma_cont = NULL;
-+ unsigned long key = (unsigned long)rmap_item->slot;
-+ unsigned long factor = rmap_item->slot->rung->step;
-+
-+ BUG_ON(!stable_node);
-+ rmap_item->address |= STABLE_FLAG;
-+
-+ if (hlist_empty(&stable_node->hlist)) {
-+ uksm_pages_shared++;
-+ goto node_vma_new;
-+ } else {
-+ uksm_pages_sharing++;
-+ }
-+
-+ hlist_for_each_entry(node_vma, &stable_node->hlist, hlist) {
-+ if (node_vma->key >= key)
-+ break;
-+
-+ if (logdedup) {
-+ node_vma->slot->pages_bemerged += factor;
-+ if (list_empty(&node_vma->slot->dedup_list))
-+ list_add(&node_vma->slot->dedup_list,
-+ &vma_slot_dedup);
-+ }
-+ }
-+
-+ if (node_vma) {
-+ if (node_vma->key == key) {
-+ node_vma_cont = hlist_entry_safe(node_vma->hlist.next, struct node_vma, hlist);
-+ goto node_vma_ok;
-+ } else if (node_vma->key > key) {
-+ node_vma_cont = node_vma;
-+ }
-+ }
-+
-+node_vma_new:
-+ /* no same vma already in node, alloc a new node_vma */
-+ new_node_vma = alloc_node_vma();
-+ BUG_ON(!new_node_vma);
-+ new_node_vma->head = stable_node;
-+ new_node_vma->slot = rmap_item->slot;
-+
-+ if (!node_vma) {
-+ hlist_add_head(&new_node_vma->hlist, &stable_node->hlist);
-+ } else if (node_vma->key != key) {
-+ if (node_vma->key < key)
-+ hlist_add_after(&node_vma->hlist, &new_node_vma->hlist);
-+ else {
-+ hlist_add_before(&new_node_vma->hlist,
-+ &node_vma->hlist);
-+ }
-+
-+ }
-+ node_vma = new_node_vma;
-+
-+node_vma_ok: /* ok, ready to add to the list */
-+ rmap_item->head = node_vma;
-+ hlist_add_head(&rmap_item->hlist, &node_vma->rmap_hlist);
-+ hold_anon_vma(rmap_item, rmap_item->slot->vma->anon_vma);
-+ if (logdedup) {
-+ rmap_item->slot->pages_merged++;
-+ if (node_vma_cont) {
-+ node_vma = node_vma_cont;
-+ hlist_for_each_entry_continue(node_vma, hlist) {
-+ node_vma->slot->pages_bemerged += factor;
-+ if (list_empty(&node_vma->slot->dedup_list))
-+ list_add(&node_vma->slot->dedup_list,
-+ &vma_slot_dedup);
-+ }
-+ }
-+ }
-+}
-+
-+/*
-+ * We use break_ksm to break COW on a ksm page: it's a stripped down
-+ *
-+ * if (get_user_pages(current, mm, addr, 1, 1, 1, &page, NULL) == 1)
-+ * put_page(page);
-+ *
-+ * but taking great care only to touch a ksm page, in a VM_MERGEABLE vma,
-+ * in case the application has unmapped and remapped mm,addr meanwhile.
-+ * Could a ksm page appear anywhere else? Actually yes, in a VM_PFNMAP
-+ * mmap of /dev/mem or /dev/kmem, where we would not want to touch it.
-+ */
-+static int break_ksm(struct vm_area_struct *vma, unsigned long addr)
-+{
-+ struct page *page;
-+ int ret = 0;
-+
-+ do {
-+ cond_resched();
-+ page = follow_page(vma, addr, FOLL_GET);
-+ if (IS_ERR_OR_NULL(page))
-+ break;
-+ if (PageKsm(page)) {
-+ ret = handle_mm_fault(vma->vm_mm, vma, addr,
-+ FAULT_FLAG_WRITE);
-+ } else
-+ ret = VM_FAULT_WRITE;
-+ put_page(page);
-+ } while (!(ret & (VM_FAULT_WRITE | VM_FAULT_SIGBUS | VM_FAULT_OOM)));
-+ /*
-+ * We must loop because handle_mm_fault() may back out if there's
-+ * any difficulty e.g. if pte accessed bit gets updated concurrently.
-+ *
-+ * VM_FAULT_WRITE is what we have been hoping for: it indicates that
-+ * COW has been broken, even if the vma does not permit VM_WRITE;
-+ * but note that a concurrent fault might break PageKsm for us.
-+ *
-+ * VM_FAULT_SIGBUS could occur if we race with truncation of the
-+ * backing file, which also invalidates anonymous pages: that's
-+ * okay, that truncation will have unmapped the PageKsm for us.
-+ *
-+ * VM_FAULT_OOM: at the time of writing (late July 2009), setting
-+ * aside mem_cgroup limits, VM_FAULT_OOM would only be set if the
-+ * current task has TIF_MEMDIE set, and will be OOM killed on return
-+ * to user; and ksmd, having no mm, would never be chosen for that.
-+ *
-+ * But if the mm is in a limited mem_cgroup, then the fault may fail
-+ * with VM_FAULT_OOM even if the current task is not TIF_MEMDIE; and
-+ * even ksmd can fail in this way - though it's usually breaking ksm
-+ * just to undo a merge it made a moment before, so unlikely to oom.
-+ *
-+ * That's a pity: we might therefore have more kernel pages allocated
-+ * than we're counting as nodes in the stable tree; but uksm_do_scan
-+ * will retry to break_cow on each pass, so should recover the page
-+ * in due course. The important thing is to not let VM_MERGEABLE
-+ * be cleared while any such pages might remain in the area.
-+ */
-+ return (ret & VM_FAULT_OOM) ? -ENOMEM : 0;
-+}
-+
-+static void break_cow(struct rmap_item *rmap_item)
-+{
-+ struct vm_area_struct *vma = rmap_item->slot->vma;
-+ struct mm_struct *mm = vma->vm_mm;
-+ unsigned long addr = get_rmap_addr(rmap_item);
-+
-+ if (uksm_test_exit(mm))
-+ goto out;
-+
-+ break_ksm(vma, addr);
-+out:
-+ return;
-+}
-+
-+/*
-+ * Though it's very tempting to unmerge in_stable_tree(rmap_item)s rather
-+ * than check every pte of a given vma, the locking doesn't quite work for
-+ * that - an rmap_item is assigned to the stable tree after inserting ksm
-+ * page and upping mmap_sem. Nor does it fit with the way we skip dup'ing
-+ * rmap_items from parent to child at fork time (so as not to waste time
-+ * if exit comes before the next scan reaches it).
-+ *
-+ * Similarly, although we'd like to remove rmap_items (so updating counts
-+ * and freeing memory) when unmerging an area, it's easier to leave that
-+ * to the next pass of ksmd - consider, for example, how ksmd might be
-+ * in cmp_and_merge_page on one of the rmap_items we would be removing.
-+ */
-+inline int unmerge_uksm_pages(struct vm_area_struct *vma,
-+ unsigned long start, unsigned long end)
-+{
-+ unsigned long addr;
-+ int err = 0;
-+
-+ for (addr = start; addr < end && !err; addr += PAGE_SIZE) {
-+ if (uksm_test_exit(vma->vm_mm))
-+ break;
-+ if (signal_pending(current))
-+ err = -ERESTARTSYS;
-+ else
-+ err = break_ksm(vma, addr);
-+ }
-+ return err;
-+}
-+
-+static inline void inc_uksm_pages_scanned(void)
-+{
-+ u64 delta;
-+
-+
-+ if (uksm_pages_scanned == U64_MAX) {
-+ encode_benefit();
-+
-+ delta = uksm_pages_scanned >> pages_scanned_base;
-+
-+ if (CAN_OVERFLOW_U64(pages_scanned_stored, delta)) {
-+ pages_scanned_stored >>= 1;
-+ delta >>= 1;
-+ pages_scanned_base++;
-+ }
-+
-+ pages_scanned_stored += delta;
-+
-+ uksm_pages_scanned = uksm_pages_scanned_last = 0;
-+ }
-+
-+ uksm_pages_scanned++;
-+}
-+
-+static inline int find_zero_page_hash(int strength, u32 hash)
-+{
-+ return (zero_hash_table[strength] == hash);
-+}
-+
-+static
-+int cmp_and_merge_zero_page(struct vm_area_struct *vma, struct page *page)
-+{
-+ struct page *zero_page = empty_uksm_zero_page;
-+ struct mm_struct *mm = vma->vm_mm;
-+ pte_t orig_pte = __pte(0);
-+ int err = -EFAULT;
-+
-+ if (uksm_test_exit(mm))
-+ goto out;
-+
-+ if (PageTransCompound(page) && page_trans_compound_anon_split(page))
-+ goto out;
-+ BUG_ON(PageTransCompound(page));
-+
-+ if (!PageAnon(page))
-+ goto out;
-+
-+ if (!trylock_page(page))
-+ goto out;
-+
-+ if (write_protect_page(vma, page, &orig_pte, 0) == 0) {
-+ if (is_page_full_zero(page))
-+ err = replace_page(vma, page, zero_page, orig_pte);
-+ }
-+
-+ unlock_page(page);
-+out:
-+ return err;
-+}
-+
-+/*
-+ * cmp_and_merge_page() - first see if page can be merged into the stable
-+ * tree; if not, compare hash to previous and if it's the same, see if page
-+ * can be inserted into the unstable tree, or merged with a page already there
-+ * and both transferred to the stable tree.
-+ *
-+ * @page: the page that we are searching identical page to.
-+ * @rmap_item: the reverse mapping into the virtual address of this page
-+ */
-+static void cmp_and_merge_page(struct rmap_item *rmap_item, u32 hash)
-+{
-+ struct rmap_item *tree_rmap_item;
-+ struct page *page;
-+ struct page *kpage = NULL;
-+ u32 hash_max;
-+ int err;
-+ unsigned int success1, success2;
-+ struct stable_node *snode;
-+ int cmp;
-+ struct rb_node *parent = NULL, **new;
-+
-+ remove_rmap_item_from_tree(rmap_item);
-+ page = rmap_item->page;
-+
-+ /* We first start with searching the page inside the stable tree */
-+ kpage = stable_tree_search(rmap_item, hash);
-+ if (kpage) {
-+ err = try_to_merge_with_uksm_page(rmap_item, kpage,
-+ hash);
-+ if (!err) {
-+ /*
-+ * The page was successfully merged, add
-+ * its rmap_item to the stable tree.
-+ * page lock is needed because it's
-+ * racing with try_to_unmap_ksm(), etc.
-+ */
-+ lock_page(kpage);
-+ snode = page_stable_node(kpage);
-+ stable_tree_append(rmap_item, snode, 1);
-+ unlock_page(kpage);
-+ put_page(kpage);
-+ return; /* success */
-+ }
-+ put_page(kpage);
-+
-+ /*
-+ * if it's a collision and it has been search in sub-rbtree
-+ * (hash_max != 0), we want to abort, because if it is
-+ * successfully merged in unstable tree, the collision trends to
-+ * happen again.
-+ */
-+ if (err == MERGE_ERR_COLLI && rmap_item->hash_max)
-+ return;
-+ }
-+
-+ tree_rmap_item =
-+ unstable_tree_search_insert(rmap_item, hash);
-+ if (tree_rmap_item) {
-+ err = try_to_merge_two_pages(rmap_item, tree_rmap_item, hash);
-+ /*
-+ * As soon as we merge this page, we want to remove the
-+ * rmap_item of the page we have merged with from the unstable
-+ * tree, and insert it instead as new node in the stable tree.
-+ */
-+ if (!err) {
-+ kpage = page;
-+ remove_rmap_item_from_tree(tree_rmap_item);
-+ lock_page(kpage);
-+ snode = stable_tree_insert(&kpage, hash,
-+ rmap_item, tree_rmap_item,
-+ &success1, &success2);
-+
-+ /*
-+ * Do not log dedup for tree item, it's not counted as
-+ * scanned in this round.
-+ */
-+ if (success2)
-+ stable_tree_append(tree_rmap_item, snode, 0);
-+
-+ /*
-+ * The order of these two stable append is important:
-+ * we are scanning rmap_item.
-+ */
-+ if (success1)
-+ stable_tree_append(rmap_item, snode, 1);
-+
-+ /*
-+ * The original kpage may be unlocked inside
-+ * stable_tree_insert() already. This page
-+ * should be unlocked before doing
-+ * break_cow().
-+ */
-+ unlock_page(kpage);
-+
-+ if (!success1)
-+ break_cow(rmap_item);
-+
-+ if (!success2)
-+ break_cow(tree_rmap_item);
-+
-+ } else if (err == MERGE_ERR_COLLI) {
-+ BUG_ON(tree_rmap_item->tree_node->count > 1);
-+
-+ rmap_item_hash_max(tree_rmap_item,
-+ tree_rmap_item->tree_node->hash);
-+
-+ hash_max = rmap_item_hash_max(rmap_item, hash);
-+ cmp = hash_cmp(hash_max, tree_rmap_item->hash_max);
-+ parent = &tree_rmap_item->node;
-+ if (cmp < 0)
-+ new = &parent->rb_left;
-+ else if (cmp > 0)
-+ new = &parent->rb_right;
-+ else
-+ goto put_up_out;
-+
-+ rmap_item->tree_node = tree_rmap_item->tree_node;
-+ rmap_item->address |= UNSTABLE_FLAG;
-+ rmap_item->hash_round = uksm_hash_round;
-+ rb_link_node(&rmap_item->node, parent, new);
-+ rb_insert_color(&rmap_item->node,
-+ &tree_rmap_item->tree_node->sub_root);
-+ rmap_item->tree_node->count++;
-+ } else {
-+ /*
-+ * either one of the page has changed or they collide
-+ * at the max hash, we consider them as ill items.
-+ */
-+ remove_rmap_item_from_tree(tree_rmap_item);
-+ }
-+put_up_out:
-+ put_page(tree_rmap_item->page);
-+ up_read(&tree_rmap_item->slot->vma->vm_mm->mmap_sem);
-+ }
-+}
-+
-+
-+
-+
-+static inline unsigned long get_pool_index(struct vma_slot *slot,
-+ unsigned long index)
-+{
-+ unsigned long pool_index;
-+
-+ pool_index = (sizeof(struct rmap_list_entry *) * index) >> PAGE_SHIFT;
-+ if (pool_index >= slot->pool_size)
-+ BUG();
-+ return pool_index;
-+}
-+
-+static inline unsigned long index_page_offset(unsigned long index)
-+{
-+ return offset_in_page(sizeof(struct rmap_list_entry *) * index);
-+}
-+
-+static inline
-+struct rmap_list_entry *get_rmap_list_entry(struct vma_slot *slot,
-+ unsigned long index, int need_alloc)
-+{
-+ unsigned long pool_index;
-+ struct page *page;
-+ void *addr;
-+
-+
-+ pool_index = get_pool_index(slot, index);
-+ if (!slot->rmap_list_pool[pool_index]) {
-+ if (!need_alloc)
-+ return NULL;
-+
-+ page = alloc_page(GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN);
-+ if (!page)
-+ return NULL;
-+
-+ slot->rmap_list_pool[pool_index] = page;
-+ }
-+
-+ addr = kmap(slot->rmap_list_pool[pool_index]);
-+ addr += index_page_offset(index);
-+
-+ return addr;
-+}
-+
-+static inline void put_rmap_list_entry(struct vma_slot *slot,
-+ unsigned long index)
-+{
-+ unsigned long pool_index;
-+
-+ pool_index = get_pool_index(slot, index);
-+ BUG_ON(!slot->rmap_list_pool[pool_index]);
-+ kunmap(slot->rmap_list_pool[pool_index]);
-+}
-+
-+static inline int entry_is_new(struct rmap_list_entry *entry)
-+{
-+ return !entry->item;
-+}
-+
-+static inline unsigned long get_index_orig_addr(struct vma_slot *slot,
-+ unsigned long index)
-+{
-+ return slot->vma->vm_start + (index << PAGE_SHIFT);
-+}
-+
-+static inline unsigned long get_entry_address(struct rmap_list_entry *entry)
-+{
-+ unsigned long addr;
-+
-+ if (is_addr(entry->addr))
-+ addr = get_clean_addr(entry->addr);
-+ else if (entry->item)
-+ addr = get_rmap_addr(entry->item);
-+ else
-+ BUG();
-+
-+ return addr;
-+}
-+
-+static inline struct rmap_item *get_entry_item(struct rmap_list_entry *entry)
-+{
-+ if (is_addr(entry->addr))
-+ return NULL;
-+
-+ return entry->item;
-+}
-+
-+static inline void inc_rmap_list_pool_count(struct vma_slot *slot,
-+ unsigned long index)
-+{
-+ unsigned long pool_index;
-+
-+ pool_index = get_pool_index(slot, index);
-+ BUG_ON(!slot->rmap_list_pool[pool_index]);
-+ slot->pool_counts[pool_index]++;
-+}
-+
-+static inline void dec_rmap_list_pool_count(struct vma_slot *slot,
-+ unsigned long index)
-+{
-+ unsigned long pool_index;
-+
-+ pool_index = get_pool_index(slot, index);
-+ BUG_ON(!slot->rmap_list_pool[pool_index]);
-+ BUG_ON(!slot->pool_counts[pool_index]);
-+ slot->pool_counts[pool_index]--;
-+}
-+
-+static inline int entry_has_rmap(struct rmap_list_entry *entry)
-+{
-+ return !is_addr(entry->addr) && entry->item;
-+}
-+
-+static inline void swap_entries(struct rmap_list_entry *entry1,
-+ unsigned long index1,
-+ struct rmap_list_entry *entry2,
-+ unsigned long index2)
-+{
-+ struct rmap_list_entry tmp;
-+
-+ /* swapping two new entries is meaningless */
-+ BUG_ON(entry_is_new(entry1) && entry_is_new(entry2));
-+
-+ tmp = *entry1;
-+ *entry1 = *entry2;
-+ *entry2 = tmp;
-+
-+ if (entry_has_rmap(entry1))
-+ entry1->item->entry_index = index1;
-+
-+ if (entry_has_rmap(entry2))
-+ entry2->item->entry_index = index2;
-+
-+ if (entry_has_rmap(entry1) && !entry_has_rmap(entry2)) {
-+ inc_rmap_list_pool_count(entry1->item->slot, index1);
-+ dec_rmap_list_pool_count(entry1->item->slot, index2);
-+ } else if (!entry_has_rmap(entry1) && entry_has_rmap(entry2)) {
-+ inc_rmap_list_pool_count(entry2->item->slot, index2);
-+ dec_rmap_list_pool_count(entry2->item->slot, index1);
-+ }
-+}
-+
-+static inline void free_entry_item(struct rmap_list_entry *entry)
-+{
-+ unsigned long index;
-+ struct rmap_item *item;
-+
-+ if (!is_addr(entry->addr)) {
-+ BUG_ON(!entry->item);
-+ item = entry->item;
-+ entry->addr = get_rmap_addr(item);
-+ set_is_addr(entry->addr);
-+ index = item->entry_index;
-+ remove_rmap_item_from_tree(item);
-+ dec_rmap_list_pool_count(item->slot, index);
-+ free_rmap_item(item);
-+ }
-+}
-+
-+static inline int pool_entry_boundary(unsigned long index)
-+{
-+ unsigned long linear_addr;
-+
-+ linear_addr = sizeof(struct rmap_list_entry *) * index;
-+ return index && !offset_in_page(linear_addr);
-+}
-+
-+static inline void try_free_last_pool(struct vma_slot *slot,
-+ unsigned long index)
-+{
-+ unsigned long pool_index;
-+
-+ pool_index = get_pool_index(slot, index);
-+ if (slot->rmap_list_pool[pool_index] &&
-+ !slot->pool_counts[pool_index]) {
-+ __free_page(slot->rmap_list_pool[pool_index]);
-+ slot->rmap_list_pool[pool_index] = NULL;
-+ slot->flags |= UKSM_SLOT_NEED_SORT;
-+ }
-+
-+}
-+
-+static inline unsigned long vma_item_index(struct vm_area_struct *vma,
-+ struct rmap_item *item)
-+{
-+ return (get_rmap_addr(item) - vma->vm_start) >> PAGE_SHIFT;
-+}
-+
-+static int within_same_pool(struct vma_slot *slot,
-+ unsigned long i, unsigned long j)
-+{
-+ unsigned long pool_i, pool_j;
-+
-+ pool_i = get_pool_index(slot, i);
-+ pool_j = get_pool_index(slot, j);
-+
-+ return (pool_i == pool_j);
-+}
-+
-+static void sort_rmap_entry_list(struct vma_slot *slot)
-+{
-+ unsigned long i, j;
-+ struct rmap_list_entry *entry, *swap_entry;
-+
-+ entry = get_rmap_list_entry(slot, 0, 0);
-+ for (i = 0; i < slot->pages; ) {
-+
-+ if (!entry)
-+ goto skip_whole_pool;
-+
-+ if (entry_is_new(entry))
-+ goto next_entry;
-+
-+ if (is_addr(entry->addr)) {
-+ entry->addr = 0;
-+ goto next_entry;
-+ }
-+
-+ j = vma_item_index(slot->vma, entry->item);
-+ if (j == i)
-+ goto next_entry;
-+
-+ if (within_same_pool(slot, i, j))
-+ swap_entry = entry + j - i;
-+ else
-+ swap_entry = get_rmap_list_entry(slot, j, 1);
-+
-+ swap_entries(entry, i, swap_entry, j);
-+ if (!within_same_pool(slot, i, j))
-+ put_rmap_list_entry(slot, j);
-+ continue;
-+
-+skip_whole_pool:
-+ i += PAGE_SIZE / sizeof(*entry);
-+ if (i < slot->pages)
-+ entry = get_rmap_list_entry(slot, i, 0);
-+ continue;
-+
-+next_entry:
-+ if (i >= slot->pages - 1 ||
-+ !within_same_pool(slot, i, i + 1)) {
-+ put_rmap_list_entry(slot, i);
-+ if (i + 1 < slot->pages)
-+ entry = get_rmap_list_entry(slot, i + 1, 0);
-+ } else
-+ entry++;
-+ i++;
-+ continue;
-+ }
-+
-+ /* free empty pool entries which contain no rmap_item */
-+ /* CAN be simplied to based on only pool_counts when bug freed !!!!! */
-+ for (i = 0; i < slot->pool_size; i++) {
-+ unsigned char has_rmap;
-+ void *addr;
-+
-+ if (!slot->rmap_list_pool[i])
-+ continue;
-+
-+ has_rmap = 0;
-+ addr = kmap(slot->rmap_list_pool[i]);
-+ BUG_ON(!addr);
-+ for (j = 0; j < PAGE_SIZE / sizeof(*entry); j++) {
-+ entry = (struct rmap_list_entry *)addr + j;
-+ if (is_addr(entry->addr))
-+ continue;
-+ if (!entry->item)
-+ continue;
-+ has_rmap = 1;
-+ }
-+ kunmap(slot->rmap_list_pool[i]);
-+ if (!has_rmap) {
-+ BUG_ON(slot->pool_counts[i]);
-+ __free_page(slot->rmap_list_pool[i]);
-+ slot->rmap_list_pool[i] = NULL;
-+ }
-+ }
-+
-+ slot->flags &= ~UKSM_SLOT_NEED_SORT;
-+}
-+
-+/*
-+ * vma_fully_scanned() - if all the pages in this slot have been scanned.
-+ */
-+static inline int vma_fully_scanned(struct vma_slot *slot)
-+{
-+ return slot->pages_scanned == slot->pages;
-+}
-+
-+/**
-+ * get_next_rmap_item() - Get the next rmap_item in a vma_slot according to
-+ * its random permutation. This function is embedded with the random
-+ * permutation index management code.
-+ */
-+static struct rmap_item *get_next_rmap_item(struct vma_slot *slot, u32 *hash)
-+{
-+ unsigned long rand_range, addr, swap_index, scan_index;
-+ struct rmap_item *item = NULL;
-+ struct rmap_list_entry *scan_entry, *swap_entry = NULL;
-+ struct page *page;
-+
-+ scan_index = swap_index = slot->pages_scanned % slot->pages;
-+
-+ if (pool_entry_boundary(scan_index))
-+ try_free_last_pool(slot, scan_index - 1);
-+
-+ if (vma_fully_scanned(slot)) {
-+ if (slot->flags & UKSM_SLOT_NEED_SORT)
-+ slot->flags |= UKSM_SLOT_NEED_RERAND;
-+ else
-+ slot->flags &= ~UKSM_SLOT_NEED_RERAND;
-+ if (slot->flags & UKSM_SLOT_NEED_SORT)
-+ sort_rmap_entry_list(slot);
-+ }
-+
-+ scan_entry = get_rmap_list_entry(slot, scan_index, 1);
-+ if (!scan_entry)
-+ return NULL;
-+
-+ if (entry_is_new(scan_entry)) {
-+ scan_entry->addr = get_index_orig_addr(slot, scan_index);
-+ set_is_addr(scan_entry->addr);
-+ }
-+
-+ if (slot->flags & UKSM_SLOT_NEED_RERAND) {
-+ rand_range = slot->pages - scan_index;
-+ BUG_ON(!rand_range);
-+ swap_index = scan_index + (prandom_u32() % rand_range);
-+ }
-+
-+ if (swap_index != scan_index) {
-+ swap_entry = get_rmap_list_entry(slot, swap_index, 1);
-+ if (entry_is_new(swap_entry)) {
-+ swap_entry->addr = get_index_orig_addr(slot,
-+ swap_index);
-+ set_is_addr(swap_entry->addr);
-+ }
-+ swap_entries(scan_entry, scan_index, swap_entry, swap_index);
-+ }
-+
-+ addr = get_entry_address(scan_entry);
-+ item = get_entry_item(scan_entry);
-+ BUG_ON(addr > slot->vma->vm_end || addr < slot->vma->vm_start);
-+
-+ page = follow_page(slot->vma, addr, FOLL_GET);
-+ if (IS_ERR_OR_NULL(page))
-+ goto nopage;
-+
-+ if (!PageAnon(page) && !page_trans_compound_anon(page))
-+ goto putpage;
-+
-+ /*check is zero_page pfn or uksm_zero_page*/
-+ if ((page_to_pfn(page) == zero_pfn)
-+ || (page_to_pfn(page) == uksm_zero_pfn))
-+ goto putpage;
-+
-+ flush_anon_page(slot->vma, page, addr);
-+ flush_dcache_page(page);
-+
-+
-+ *hash = page_hash(page, hash_strength, 1);
-+ inc_uksm_pages_scanned();
-+ /*if the page content all zero, re-map to zero-page*/
-+ if (find_zero_page_hash(hash_strength, *hash)) {
-+ if (!cmp_and_merge_zero_page(slot->vma, page)) {
-+ slot->pages_merged++;
-+ __inc_zone_page_state(page, NR_UKSM_ZERO_PAGES);
-+ dec_mm_counter(slot->mm, MM_ANONPAGES);
-+
-+ /* For full-zero pages, no need to create rmap item */
-+ goto putpage;
-+ } else {
-+ inc_rshash_neg(memcmp_cost / 2);
-+ }
-+ }
-+
-+ if (!item) {
-+ item = alloc_rmap_item();
-+ if (item) {
-+ /* It has already been zeroed */
-+ item->slot = slot;
-+ item->address = addr;
-+ item->entry_index = scan_index;
-+ scan_entry->item = item;
-+ inc_rmap_list_pool_count(slot, scan_index);
-+ } else
-+ goto putpage;
-+ }
-+
-+ BUG_ON(item->slot != slot);
-+ /* the page may have changed */
-+ item->page = page;
-+ put_rmap_list_entry(slot, scan_index);
-+ if (swap_entry)
-+ put_rmap_list_entry(slot, swap_index);
-+ return item;
-+
-+putpage:
-+ put_page(page);
-+ page = NULL;
-+nopage:
-+ /* no page, store addr back and free rmap_item if possible */
-+ free_entry_item(scan_entry);
-+ put_rmap_list_entry(slot, scan_index);
-+ if (swap_entry)
-+ put_rmap_list_entry(slot, swap_index);
-+ return NULL;
-+}
-+
-+static inline int in_stable_tree(struct rmap_item *rmap_item)
-+{
-+ return rmap_item->address & STABLE_FLAG;
-+}
-+
-+/**
-+ * scan_vma_one_page() - scan the next page in a vma_slot. Called with
-+ * mmap_sem locked.
-+ */
-+static noinline void scan_vma_one_page(struct vma_slot *slot)
-+{
-+ u32 hash;
-+ struct mm_struct *mm;
-+ struct rmap_item *rmap_item = NULL;
-+ struct vm_area_struct *vma = slot->vma;
-+
-+ mm = vma->vm_mm;
-+ BUG_ON(!mm);
-+ BUG_ON(!slot);
-+
-+ rmap_item = get_next_rmap_item(slot, &hash);
-+ if (!rmap_item)
-+ goto out1;
-+
-+ if (PageKsm(rmap_item->page) && in_stable_tree(rmap_item))
-+ goto out2;
-+
-+ cmp_and_merge_page(rmap_item, hash);
-+out2:
-+ put_page(rmap_item->page);
-+out1:
-+ slot->pages_scanned++;
-+ if (slot->fully_scanned_round != fully_scanned_round)
-+ scanned_virtual_pages++;
-+
-+ if (vma_fully_scanned(slot))
-+ slot->fully_scanned_round = fully_scanned_round;
-+}
-+
-+static inline unsigned long rung_get_pages(struct scan_rung *rung)
-+{
-+ struct slot_tree_node *node;
-+
-+ if (!rung->vma_root.rnode)
-+ return 0;
-+
-+ node = container_of(rung->vma_root.rnode, struct slot_tree_node, snode);
-+
-+ return node->size;
-+}
-+
-+#define RUNG_SAMPLED_MIN 3
-+
-+static inline
-+void uksm_calc_rung_step(struct scan_rung *rung,
-+ unsigned long page_time, unsigned long ratio)
-+{
-+ unsigned long sampled, pages;
-+
-+ /* will be fully scanned ? */
-+ if (!rung->cover_msecs) {
-+ rung->step = 1;
-+ return;
-+ }
-+
-+ sampled = rung->cover_msecs * (NSEC_PER_MSEC / TIME_RATIO_SCALE)
-+ * ratio / page_time;
-+
-+ /*
-+ * Before we finsish a scan round and expensive per-round jobs,
-+ * we need to have a chance to estimate the per page time. So
-+ * the sampled number can not be too small.
-+ */
-+ if (sampled < RUNG_SAMPLED_MIN)
-+ sampled = RUNG_SAMPLED_MIN;
-+
-+ pages = rung_get_pages(rung);
-+ if (likely(pages > sampled))
-+ rung->step = pages / sampled;
-+ else
-+ rung->step = 1;
-+}
-+
-+static inline int step_need_recalc(struct scan_rung *rung)
-+{
-+ unsigned long pages, stepmax;
-+
-+ pages = rung_get_pages(rung);
-+ stepmax = pages / RUNG_SAMPLED_MIN;
-+
-+ return pages && (rung->step > pages ||
-+ (stepmax && rung->step > stepmax));
-+}
-+
-+static inline
-+void reset_current_scan(struct scan_rung *rung, int finished, int step_recalc)
-+{
-+ struct vma_slot *slot;
-+
-+ if (finished)
-+ rung->flags |= UKSM_RUNG_ROUND_FINISHED;
-+
-+ if (step_recalc || step_need_recalc(rung)) {
-+ uksm_calc_rung_step(rung, uksm_ema_page_time, rung->cpu_ratio);
-+ BUG_ON(step_need_recalc(rung));
-+ }
-+
-+ slot_iter_index = prandom_u32() % rung->step;
-+ BUG_ON(!rung->vma_root.rnode);
-+ slot = sradix_tree_next(&rung->vma_root, NULL, 0, slot_iter);
-+ BUG_ON(!slot);
-+
-+ rung->current_scan = slot;
-+ rung->current_offset = slot_iter_index;
-+}
-+
-+static inline struct sradix_tree_root *slot_get_root(struct vma_slot *slot)
-+{
-+ return &slot->rung->vma_root;
-+}
-+
-+/*
-+ * return if resetted.
-+ */
-+static int advance_current_scan(struct scan_rung *rung)
-+{
-+ unsigned short n;
-+ struct vma_slot *slot, *next = NULL;
-+
-+ BUG_ON(!rung->vma_root.num);
-+
-+ slot = rung->current_scan;
-+ n = (slot->pages - rung->current_offset) % rung->step;
-+ slot_iter_index = rung->step - n;
-+ next = sradix_tree_next(&rung->vma_root, slot->snode,
-+ slot->sindex, slot_iter);
-+
-+ if (next) {
-+ rung->current_offset = slot_iter_index;
-+ rung->current_scan = next;
-+ return 0;
-+ } else {
-+ reset_current_scan(rung, 1, 0);
-+ return 1;
-+ }
-+}
-+
-+static inline void rung_rm_slot(struct vma_slot *slot)
-+{
-+ struct scan_rung *rung = slot->rung;
-+ struct sradix_tree_root *root;
-+
-+ if (rung->current_scan == slot)
-+ advance_current_scan(rung);
-+
-+ root = slot_get_root(slot);
-+ sradix_tree_delete_from_leaf(root, slot->snode, slot->sindex);
-+ slot->snode = NULL;
-+ if (step_need_recalc(rung)) {
-+ uksm_calc_rung_step(rung, uksm_ema_page_time, rung->cpu_ratio);
-+ BUG_ON(step_need_recalc(rung));
-+ }
-+
-+ /* In case advance_current_scan loop back to this slot again */
-+ if (rung->vma_root.num && rung->current_scan == slot)
-+ reset_current_scan(slot->rung, 1, 0);
-+}
-+
-+static inline void rung_add_new_slots(struct scan_rung *rung,
-+ struct vma_slot **slots, unsigned long num)
-+{
-+ int err;
-+ struct vma_slot *slot;
-+ unsigned long i;
-+ struct sradix_tree_root *root = &rung->vma_root;
-+
-+ err = sradix_tree_enter(root, (void **)slots, num);
-+ BUG_ON(err);
-+
-+ for (i = 0; i < num; i++) {
-+ slot = slots[i];
-+ slot->rung = rung;
-+ BUG_ON(vma_fully_scanned(slot));
-+ }
-+
-+ if (rung->vma_root.num == num)
-+ reset_current_scan(rung, 0, 1);
-+}
-+
-+static inline int rung_add_one_slot(struct scan_rung *rung,
-+ struct vma_slot *slot)
-+{
-+ int err;
-+
-+ err = sradix_tree_enter(&rung->vma_root, (void **)&slot, 1);
-+ if (err)
-+ return err;
-+
-+ slot->rung = rung;
-+ if (rung->vma_root.num == 1)
-+ reset_current_scan(rung, 0, 1);
-+
-+ return 0;
-+}
-+
-+/*
-+ * Return true if the slot is deleted from its rung.
-+ */
-+static inline int vma_rung_enter(struct vma_slot *slot, struct scan_rung *rung)
-+{
-+ struct scan_rung *old_rung = slot->rung;
-+ int err;
-+
-+ if (old_rung == rung)
-+ return 0;
-+
-+ rung_rm_slot(slot);
-+ err = rung_add_one_slot(rung, slot);
-+ if (err) {
-+ err = rung_add_one_slot(old_rung, slot);
-+ WARN_ON(err); /* OOPS, badly OOM, we lost this slot */
-+ }
-+
-+ return 1;
-+}
-+
-+static inline int vma_rung_up(struct vma_slot *slot)
-+{
-+ struct scan_rung *rung;
-+
-+ rung = slot->rung;
-+ if (slot->rung != &uksm_scan_ladder[SCAN_LADDER_SIZE-1])
-+ rung++;
-+
-+ return vma_rung_enter(slot, rung);
-+}
-+
-+static inline int vma_rung_down(struct vma_slot *slot)
-+{
-+ struct scan_rung *rung;
-+
-+ rung = slot->rung;
-+ if (slot->rung != &uksm_scan_ladder[0])
-+ rung--;
-+
-+ return vma_rung_enter(slot, rung);
-+}
-+
-+/**
-+ * cal_dedup_ratio() - Calculate the deduplication ratio for this slot.
-+ */
-+static unsigned long cal_dedup_ratio(struct vma_slot *slot)
-+{
-+ unsigned long ret;
-+
-+ BUG_ON(slot->pages_scanned == slot->last_scanned);
-+
-+ ret = slot->pages_merged;
-+
-+ /* Thrashing area filtering */
-+ if (ret && uksm_thrash_threshold) {
-+ if (slot->pages_cowed * 100 / slot->pages_merged
-+ > uksm_thrash_threshold) {
-+ ret = 0;
-+ } else {
-+ ret = slot->pages_merged - slot->pages_cowed;
-+ }
-+ }
-+
-+ return ret;
-+}
-+
-+/**
-+ * cal_dedup_ratio() - Calculate the deduplication ratio for this slot.
-+ */
-+static unsigned long cal_dedup_ratio_old(struct vma_slot *slot)
-+{
-+ unsigned long ret;
-+ unsigned long pages_scanned;
-+
-+ pages_scanned = slot->pages_scanned;
-+ if (!pages_scanned) {
-+ if (uksm_thrash_threshold)
-+ return 0;
-+ else
-+ pages_scanned = slot->pages_scanned;
-+ }
-+
-+ ret = slot->pages_bemerged * 100 / pages_scanned;
-+
-+ /* Thrashing area filtering */
-+ if (ret && uksm_thrash_threshold) {
-+ if (slot->pages_cowed * 100 / slot->pages_bemerged
-+ > uksm_thrash_threshold) {
-+ ret = 0;
-+ } else {
-+ ret = slot->pages_bemerged - slot->pages_cowed;
-+ }
-+ }
-+
-+ return ret;
-+}
-+
-+/**
-+ * stable_node_reinsert() - When the hash_strength has been adjusted, the
-+ * stable tree need to be restructured, this is the function re-inserting the
-+ * stable node.
-+ */
-+static inline void stable_node_reinsert(struct stable_node *new_node,
-+ struct page *page,
-+ struct rb_root *root_treep,
-+ struct list_head *tree_node_listp,
-+ u32 hash)
-+{
-+ struct rb_node **new = &root_treep->rb_node;
-+ struct rb_node *parent = NULL;
-+ struct stable_node *stable_node;
-+ struct tree_node *tree_node;
-+ struct page *tree_page;
-+ int cmp;
-+
-+ while (*new) {
-+ int cmp;
-+
-+ tree_node = rb_entry(*new, struct tree_node, node);
-+
-+ cmp = hash_cmp(hash, tree_node->hash);
-+
-+ if (cmp < 0) {
-+ parent = *new;
-+ new = &parent->rb_left;
-+ } else if (cmp > 0) {
-+ parent = *new;
-+ new = &parent->rb_right;
-+ } else
-+ break;
-+ }
-+
-+ if (*new) {
-+ /* find a stable tree node with same first level hash value */
-+ stable_node_hash_max(new_node, page, hash);
-+ if (tree_node->count == 1) {
-+ stable_node = rb_entry(tree_node->sub_root.rb_node,
-+ struct stable_node, node);
-+ tree_page = get_uksm_page(stable_node, 1, 0);
-+ if (tree_page) {
-+ stable_node_hash_max(stable_node,
-+ tree_page, hash);
-+ put_page(tree_page);
-+
-+ /* prepare for stable node insertion */
-+
-+ cmp = hash_cmp(new_node->hash_max,
-+ stable_node->hash_max);
-+ parent = &stable_node->node;
-+ if (cmp < 0)
-+ new = &parent->rb_left;
-+ else if (cmp > 0)
-+ new = &parent->rb_right;
-+ else
-+ goto failed;
-+
-+ goto add_node;
-+ } else {
-+ /* the only stable_node deleted, the tree node
-+ * was not deleted.
-+ */
-+ goto tree_node_reuse;
-+ }
-+ }
-+
-+ /* well, search the collision subtree */
-+ new = &tree_node->sub_root.rb_node;
-+ parent = NULL;
-+ BUG_ON(!*new);
-+ while (*new) {
-+ int cmp;
-+
-+ stable_node = rb_entry(*new, struct stable_node, node);
-+
-+ cmp = hash_cmp(new_node->hash_max,
-+ stable_node->hash_max);
-+
-+ if (cmp < 0) {
-+ parent = *new;
-+ new = &parent->rb_left;
-+ } else if (cmp > 0) {
-+ parent = *new;
-+ new = &parent->rb_right;
-+ } else {
-+ /* oh, no, still a collision */
-+ goto failed;
-+ }
-+ }
-+
-+ goto add_node;
-+ }
-+
-+ /* no tree node found */
-+ tree_node = alloc_tree_node(tree_node_listp);
-+ if (!tree_node) {
-+ printk(KERN_ERR "UKSM: memory allocation error!\n");
-+ goto failed;
-+ } else {
-+ tree_node->hash = hash;
-+ rb_link_node(&tree_node->node, parent, new);
-+ rb_insert_color(&tree_node->node, root_treep);
-+
-+tree_node_reuse:
-+ /* prepare for stable node insertion */
-+ parent = NULL;
-+ new = &tree_node->sub_root.rb_node;
-+ }
-+
-+add_node:
-+ rb_link_node(&new_node->node, parent, new);
-+ rb_insert_color(&new_node->node, &tree_node->sub_root);
-+ new_node->tree_node = tree_node;
-+ tree_node->count++;
-+ return;
-+
-+failed:
-+ /* This can only happen when two nodes have collided
-+ * in two levels.
-+ */
-+ new_node->tree_node = NULL;
-+ return;
-+}
-+
-+static inline void free_all_tree_nodes(struct list_head *list)
-+{
-+ struct tree_node *node, *tmp;
-+
-+ list_for_each_entry_safe(node, tmp, list, all_list) {
-+ free_tree_node(node);
-+ }
-+}
-+
-+/**
-+ * stable_tree_delta_hash() - Delta hash the stable tree from previous hash
-+ * strength to the current hash_strength. It re-structures the hole tree.
-+ */
-+static inline void stable_tree_delta_hash(u32 prev_hash_strength)
-+{
-+ struct stable_node *node, *tmp;
-+ struct rb_root *root_new_treep;
-+ struct list_head *new_tree_node_listp;
-+
-+ stable_tree_index = (stable_tree_index + 1) % 2;
-+ root_new_treep = &root_stable_tree[stable_tree_index];
-+ new_tree_node_listp = &stable_tree_node_list[stable_tree_index];
-+ *root_new_treep = RB_ROOT;
-+ BUG_ON(!list_empty(new_tree_node_listp));
-+
-+ /*
-+ * we need to be safe, the node could be removed by get_uksm_page()
-+ */
-+ list_for_each_entry_safe(node, tmp, &stable_node_list, all_list) {
-+ void *addr;
-+ struct page *node_page;
-+ u32 hash;
-+
-+ /*
-+ * We are completely re-structuring the stable nodes to a new
-+ * stable tree. We don't want to touch the old tree unlinks and
-+ * old tree_nodes. The old tree_nodes will be freed at once.
-+ */
-+ node_page = get_uksm_page(node, 0, 0);
-+ if (!node_page)
-+ continue;
-+
-+ if (node->tree_node) {
-+ hash = node->tree_node->hash;
-+
-+ addr = kmap_atomic(node_page);
-+
-+ hash = delta_hash(addr, prev_hash_strength,
-+ hash_strength, hash);
-+ kunmap_atomic(addr);
-+ } else {
-+ /*
-+ *it was not inserted to rbtree due to collision in last
-+ *round scan.
-+ */
-+ hash = page_hash(node_page, hash_strength, 0);
-+ }
-+
-+ stable_node_reinsert(node, node_page, root_new_treep,
-+ new_tree_node_listp, hash);
-+ put_page(node_page);
-+ }
-+
-+ root_stable_treep = root_new_treep;
-+ free_all_tree_nodes(stable_tree_node_listp);
-+ BUG_ON(!list_empty(stable_tree_node_listp));
-+ stable_tree_node_listp = new_tree_node_listp;
-+}
-+
-+static inline void inc_hash_strength(unsigned long delta)
-+{
-+ hash_strength += 1 << delta;
-+ if (hash_strength > HASH_STRENGTH_MAX)
-+ hash_strength = HASH_STRENGTH_MAX;
-+}
-+
-+static inline void dec_hash_strength(unsigned long delta)
-+{
-+ unsigned long change = 1 << delta;
-+
-+ if (hash_strength <= change + 1)
-+ hash_strength = 1;
-+ else
-+ hash_strength -= change;
-+}
-+
-+static inline void inc_hash_strength_delta(void)
-+{
-+ hash_strength_delta++;
-+ if (hash_strength_delta > HASH_STRENGTH_DELTA_MAX)
-+ hash_strength_delta = HASH_STRENGTH_DELTA_MAX;
-+}
-+
-+/*
-+static inline unsigned long get_current_neg_ratio(void)
-+{
-+ if (!rshash_pos || rshash_neg > rshash_pos)
-+ return 100;
-+
-+ return div64_u64(100 * rshash_neg , rshash_pos);
-+}
-+*/
-+
-+static inline unsigned long get_current_neg_ratio(void)
-+{
-+ u64 pos = benefit.pos;
-+ u64 neg = benefit.neg;
-+
-+ if (!neg)
-+ return 0;
-+
-+ if (!pos || neg > pos)
-+ return 100;
-+
-+ if (neg > div64_u64(U64_MAX, 100))
-+ pos = div64_u64(pos, 100);
-+ else
-+ neg *= 100;
-+
-+ return div64_u64(neg, pos);
-+}
-+
-+static inline unsigned long get_current_benefit(void)
-+{
-+ u64 pos = benefit.pos;
-+ u64 neg = benefit.neg;
-+ u64 scanned = benefit.scanned;
-+
-+ if (neg > pos)
-+ return 0;
-+
-+ return div64_u64((pos - neg), scanned);
-+}
-+
-+static inline int judge_rshash_direction(void)
-+{
-+ u64 current_neg_ratio, stable_benefit;
-+ u64 current_benefit, delta = 0;
-+ int ret = STILL;
-+
-+ /* Try to probe a value after the boot, and in case the system
-+ are still for a long time. */
-+ if ((fully_scanned_round & 0xFFULL) == 10) {
-+ ret = OBSCURE;
-+ goto out;
-+ }
-+
-+ current_neg_ratio = get_current_neg_ratio();
-+
-+ if (current_neg_ratio == 0) {
-+ rshash_neg_cont_zero++;
-+ if (rshash_neg_cont_zero > 2)
-+ return GO_DOWN;
-+ else
-+ return STILL;
-+ }
-+ rshash_neg_cont_zero = 0;
-+
-+ if (current_neg_ratio > 90) {
-+ ret = GO_UP;
-+ goto out;
-+ }
-+
-+ current_benefit = get_current_benefit();
-+ stable_benefit = rshash_state.stable_benefit;
-+
-+ if (!stable_benefit) {
-+ ret = OBSCURE;
-+ goto out;
-+ }
-+
-+ if (current_benefit > stable_benefit)
-+ delta = current_benefit - stable_benefit;
-+ else if (current_benefit < stable_benefit)
-+ delta = stable_benefit - current_benefit;
-+
-+ delta = div64_u64(100 * delta , stable_benefit);
-+
-+ if (delta > 50) {
-+ rshash_cont_obscure++;
-+ if (rshash_cont_obscure > 2)
-+ return OBSCURE;
-+ else
-+ return STILL;
-+ }
-+
-+out:
-+ rshash_cont_obscure = 0;
-+ return ret;
-+}
-+
-+/**
-+ * rshash_adjust() - The main function to control the random sampling state
-+ * machine for hash strength adapting.
-+ *
-+ * return true if hash_strength has changed.
-+ */
-+static inline int rshash_adjust(void)
-+{
-+ unsigned long prev_hash_strength = hash_strength;
-+
-+ if (!encode_benefit())
-+ return 0;
-+
-+ switch (rshash_state.state) {
-+ case RSHASH_STILL:
-+ switch (judge_rshash_direction()) {
-+ case GO_UP:
-+ if (rshash_state.pre_direct == GO_DOWN)
-+ hash_strength_delta = 0;
-+
-+ inc_hash_strength(hash_strength_delta);
-+ inc_hash_strength_delta();
-+ rshash_state.stable_benefit = get_current_benefit();
-+ rshash_state.pre_direct = GO_UP;
-+ break;
-+
-+ case GO_DOWN:
-+ if (rshash_state.pre_direct == GO_UP)
-+ hash_strength_delta = 0;
-+
-+ dec_hash_strength(hash_strength_delta);
-+ inc_hash_strength_delta();
-+ rshash_state.stable_benefit = get_current_benefit();
-+ rshash_state.pre_direct = GO_DOWN;
-+ break;
-+
-+ case OBSCURE:
-+ rshash_state.stable_point = hash_strength;
-+ rshash_state.turn_point_down = hash_strength;
-+ rshash_state.turn_point_up = hash_strength;
-+ rshash_state.turn_benefit_down = get_current_benefit();
-+ rshash_state.turn_benefit_up = get_current_benefit();
-+ rshash_state.lookup_window_index = 0;
-+ rshash_state.state = RSHASH_TRYDOWN;
-+ dec_hash_strength(hash_strength_delta);
-+ inc_hash_strength_delta();
-+ break;
-+
-+ case STILL:
-+ break;
-+ default:
-+ BUG();
-+ }
-+ break;
-+
-+ case RSHASH_TRYDOWN:
-+ if (rshash_state.lookup_window_index++ % 5 == 0)
-+ rshash_state.below_count = 0;
-+
-+ if (get_current_benefit() < rshash_state.stable_benefit)
-+ rshash_state.below_count++;
-+ else if (get_current_benefit() >
-+ rshash_state.turn_benefit_down) {
-+ rshash_state.turn_point_down = hash_strength;
-+ rshash_state.turn_benefit_down = get_current_benefit();
-+ }
-+
-+ if (rshash_state.below_count >= 3 ||
-+ judge_rshash_direction() == GO_UP ||
-+ hash_strength == 1) {
-+ hash_strength = rshash_state.stable_point;
-+ hash_strength_delta = 0;
-+ inc_hash_strength(hash_strength_delta);
-+ inc_hash_strength_delta();
-+ rshash_state.lookup_window_index = 0;
-+ rshash_state.state = RSHASH_TRYUP;
-+ hash_strength_delta = 0;
-+ } else {
-+ dec_hash_strength(hash_strength_delta);
-+ inc_hash_strength_delta();
-+ }
-+ break;
-+
-+ case RSHASH_TRYUP:
-+ if (rshash_state.lookup_window_index++ % 5 == 0)
-+ rshash_state.below_count = 0;
-+
-+ if (get_current_benefit() < rshash_state.turn_benefit_down)
-+ rshash_state.below_count++;
-+ else if (get_current_benefit() > rshash_state.turn_benefit_up) {
-+ rshash_state.turn_point_up = hash_strength;
-+ rshash_state.turn_benefit_up = get_current_benefit();
-+ }
-+
-+ if (rshash_state.below_count >= 3 ||
-+ judge_rshash_direction() == GO_DOWN ||
-+ hash_strength == HASH_STRENGTH_MAX) {
-+ hash_strength = rshash_state.turn_benefit_up >
-+ rshash_state.turn_benefit_down ?
-+ rshash_state.turn_point_up :
-+ rshash_state.turn_point_down;
-+
-+ rshash_state.state = RSHASH_PRE_STILL;
-+ } else {
-+ inc_hash_strength(hash_strength_delta);
-+ inc_hash_strength_delta();
-+ }
-+
-+ break;
-+
-+ case RSHASH_NEW:
-+ case RSHASH_PRE_STILL:
-+ rshash_state.stable_benefit = get_current_benefit();
-+ rshash_state.state = RSHASH_STILL;
-+ hash_strength_delta = 0;
-+ break;
-+ default:
-+ BUG();
-+ }
-+
-+ /* rshash_neg = rshash_pos = 0; */
-+ reset_benefit();
-+
-+ if (prev_hash_strength != hash_strength)
-+ stable_tree_delta_hash(prev_hash_strength);
-+
-+ return prev_hash_strength != hash_strength;
-+}
-+
-+/**
-+ * round_update_ladder() - The main function to do update of all the
-+ * adjustments whenever a scan round is finished.
-+ */
-+static noinline void round_update_ladder(void)
-+{
-+ int i;
-+ unsigned long dedup;
-+ struct vma_slot *slot, *tmp_slot;
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ uksm_scan_ladder[i].flags &= ~UKSM_RUNG_ROUND_FINISHED;
-+ }
-+
-+ list_for_each_entry_safe(slot, tmp_slot, &vma_slot_dedup, dedup_list) {
-+
-+ /* slot may be rung_rm_slot() when mm exits */
-+ if (slot->snode) {
-+ dedup = cal_dedup_ratio_old(slot);
-+ if (dedup && dedup >= uksm_abundant_threshold)
-+ vma_rung_up(slot);
-+ }
-+
-+ slot->pages_bemerged = 0;
-+ slot->pages_cowed = 0;
-+
-+ list_del_init(&slot->dedup_list);
-+ }
-+}
-+
-+static void uksm_del_vma_slot(struct vma_slot *slot)
-+{
-+ int i, j;
-+ struct rmap_list_entry *entry;
-+
-+ if (slot->snode) {
-+ /*
-+ * In case it just failed when entering the rung, it's not
-+ * necessary.
-+ */
-+ rung_rm_slot(slot);
-+ }
-+
-+ if (!list_empty(&slot->dedup_list))
-+ list_del(&slot->dedup_list);
-+
-+ if (!slot->rmap_list_pool || !slot->pool_counts) {
-+ /* In case it OOMed in uksm_vma_enter() */
-+ goto out;
-+ }
-+
-+ for (i = 0; i < slot->pool_size; i++) {
-+ void *addr;
-+
-+ if (!slot->rmap_list_pool[i])
-+ continue;
-+
-+ addr = kmap(slot->rmap_list_pool[i]);
-+ for (j = 0; j < PAGE_SIZE / sizeof(*entry); j++) {
-+ entry = (struct rmap_list_entry *)addr + j;
-+ if (is_addr(entry->addr))
-+ continue;
-+ if (!entry->item)
-+ continue;
-+
-+ remove_rmap_item_from_tree(entry->item);
-+ free_rmap_item(entry->item);
-+ slot->pool_counts[i]--;
-+ }
-+ BUG_ON(slot->pool_counts[i]);
-+ kunmap(slot->rmap_list_pool[i]);
-+ __free_page(slot->rmap_list_pool[i]);
-+ }
-+ kfree(slot->rmap_list_pool);
-+ kfree(slot->pool_counts);
-+
-+out:
-+ slot->rung = NULL;
-+ BUG_ON(uksm_pages_total < slot->pages);
-+ if (slot->flags & UKSM_SLOT_IN_UKSM)
-+ uksm_pages_total -= slot->pages;
-+
-+ if (slot->fully_scanned_round == fully_scanned_round)
-+ scanned_virtual_pages -= slot->pages;
-+ else
-+ scanned_virtual_pages -= slot->pages_scanned;
-+ free_vma_slot(slot);
-+}
-+
-+
-+#define SPIN_LOCK_PERIOD 32
-+static struct vma_slot *cleanup_slots[SPIN_LOCK_PERIOD];
-+static inline void cleanup_vma_slots(void)
-+{
-+ struct vma_slot *slot;
-+ int i;
-+
-+ i = 0;
-+ spin_lock(&vma_slot_list_lock);
-+ while (!list_empty(&vma_slot_del)) {
-+ slot = list_entry(vma_slot_del.next,
-+ struct vma_slot, slot_list);
-+ list_del(&slot->slot_list);
-+ cleanup_slots[i++] = slot;
-+ if (i == SPIN_LOCK_PERIOD) {
-+ spin_unlock(&vma_slot_list_lock);
-+ while (--i >= 0)
-+ uksm_del_vma_slot(cleanup_slots[i]);
-+ i = 0;
-+ spin_lock(&vma_slot_list_lock);
-+ }
-+ }
-+ spin_unlock(&vma_slot_list_lock);
-+
-+ while (--i >= 0)
-+ uksm_del_vma_slot(cleanup_slots[i]);
-+}
-+
-+/*
-+*expotional moving average formula
-+*/
-+static inline unsigned long ema(unsigned long curr, unsigned long last_ema)
-+{
-+ /*
-+ * For a very high burst, even the ema cannot work well, a false very
-+ * high per-page time estimation can result in feedback in very high
-+ * overhead of context swith and rung update -- this will then lead
-+ * to higher per-paper time, this may not converge.
-+ *
-+ * Instead, we try to approach this value in a binary manner.
-+ */
-+ if (curr > last_ema * 10)
-+ return last_ema * 2;
-+
-+ return (EMA_ALPHA * curr + (100 - EMA_ALPHA) * last_ema) / 100;
-+}
-+
-+/*
-+ * convert cpu ratio in 1/TIME_RATIO_SCALE configured by user to
-+ * nanoseconds based on current uksm_sleep_jiffies.
-+ */
-+static inline unsigned long cpu_ratio_to_nsec(unsigned int ratio)
-+{
-+ return NSEC_PER_USEC * jiffies_to_usecs(uksm_sleep_jiffies) /
-+ (TIME_RATIO_SCALE - ratio) * ratio;
-+}
-+
-+
-+static inline unsigned long rung_real_ratio(int cpu_time_ratio)
-+{
-+ unsigned long ret;
-+
-+ BUG_ON(!cpu_time_ratio);
-+
-+ if (cpu_time_ratio > 0)
-+ ret = cpu_time_ratio;
-+ else
-+ ret = (unsigned long)(-cpu_time_ratio) *
-+ uksm_max_cpu_percentage / 100UL;
-+
-+ return ret ? ret : 1;
-+}
-+
-+static noinline void uksm_calc_scan_pages(void)
-+{
-+ struct scan_rung *ladder = uksm_scan_ladder;
-+ unsigned long sleep_usecs, nsecs;
-+ unsigned long ratio;
-+ int i;
-+ unsigned long per_page;
-+
-+ if (uksm_ema_page_time > 100000 ||
-+ (((unsigned long) uksm_eval_round & (256UL - 1)) == 0UL))
-+ uksm_ema_page_time = UKSM_PAGE_TIME_DEFAULT;
-+
-+ per_page = uksm_ema_page_time;
-+ BUG_ON(!per_page);
-+
-+ /*
-+ * For every 8 eval round, we try to probe a uksm_sleep_jiffies value
-+ * based on saved user input.
-+ */
-+ if (((unsigned long) uksm_eval_round & (8UL - 1)) == 0UL)
-+ uksm_sleep_jiffies = uksm_sleep_saved;
-+
-+ /* We require a rung scan at least 1 page in a period. */
-+ nsecs = per_page;
-+ ratio = rung_real_ratio(ladder[0].cpu_ratio);
-+ if (cpu_ratio_to_nsec(ratio) < nsecs) {
-+ sleep_usecs = nsecs * (TIME_RATIO_SCALE - ratio) / ratio
-+ / NSEC_PER_USEC;
-+ uksm_sleep_jiffies = usecs_to_jiffies(sleep_usecs) + 1;
-+ }
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ ratio = rung_real_ratio(ladder[i].cpu_ratio);
-+ ladder[i].pages_to_scan = cpu_ratio_to_nsec(ratio) /
-+ per_page;
-+ BUG_ON(!ladder[i].pages_to_scan);
-+ uksm_calc_rung_step(&ladder[i], per_page, ratio);
-+ }
-+}
-+
-+/*
-+ * From the scan time of this round (ns) to next expected min sleep time
-+ * (ms), be careful of the possible overflows. ratio is taken from
-+ * rung_real_ratio()
-+ */
-+static inline
-+unsigned int scan_time_to_sleep(unsigned long long scan_time, unsigned long ratio)
-+{
-+ scan_time >>= 20; /* to msec level now */
-+ BUG_ON(scan_time > (ULONG_MAX / TIME_RATIO_SCALE));
-+
-+ return (unsigned int) ((unsigned long) scan_time *
-+ (TIME_RATIO_SCALE - ratio) / ratio);
-+}
-+
-+#define __round_mask(x, y) ((__typeof__(x))((y)-1))
-+#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
-+
-+static inline unsigned long vma_pool_size(struct vma_slot *slot)
-+{
-+ return round_up(sizeof(struct rmap_list_entry) * slot->pages,
-+ PAGE_SIZE) >> PAGE_SHIFT;
-+}
-+
-+static void uksm_vma_enter(struct vma_slot **slots, unsigned long num)
-+{
-+ struct scan_rung *rung;
-+ unsigned long pool_size, i;
-+ struct vma_slot *slot;
-+ int failed;
-+
-+ rung = &uksm_scan_ladder[0];
-+
-+ failed = 0;
-+ for (i = 0; i < num; i++) {
-+ slot = slots[i];
-+
-+ pool_size = vma_pool_size(slot);
-+ slot->rmap_list_pool = kzalloc(sizeof(struct page *) *
-+ pool_size, GFP_KERNEL);
-+ if (!slot->rmap_list_pool)
-+ break;
-+
-+ slot->pool_counts = kzalloc(sizeof(unsigned int) * pool_size,
-+ GFP_KERNEL);
-+ if (!slot->pool_counts) {
-+ kfree(slot->rmap_list_pool);
-+ break;
-+ }
-+
-+ slot->pool_size = pool_size;
-+ BUG_ON(CAN_OVERFLOW_U64(uksm_pages_total, slot->pages));
-+ slot->flags |= UKSM_SLOT_IN_UKSM;
-+ uksm_pages_total += slot->pages;
-+ }
-+
-+ if (i)
-+ rung_add_new_slots(rung, slots, i);
-+
-+ return;
-+}
-+
-+static struct vma_slot *batch_slots[SLOT_TREE_NODE_STORE_SIZE];
-+
-+static void uksm_enter_all_slots(void)
-+{
-+ struct vma_slot *slot;
-+ unsigned long index;
-+ struct list_head empty_vma_list;
-+ int i;
-+
-+ i = 0;
-+ index = 0;
-+ INIT_LIST_HEAD(&empty_vma_list);
-+
-+ spin_lock(&vma_slot_list_lock);
-+ while (!list_empty(&vma_slot_new)) {
-+ slot = list_entry(vma_slot_new.next,
-+ struct vma_slot, slot_list);
-+
-+ if (!slot->vma->anon_vma) {
-+ list_move(&slot->slot_list, &empty_vma_list);
-+ } else if (vma_can_enter(slot->vma)) {
-+ batch_slots[index++] = slot;
-+ list_del_init(&slot->slot_list);
-+ } else {
-+ list_move(&slot->slot_list, &vma_slot_noadd);
-+ }
-+
-+ if (++i == SPIN_LOCK_PERIOD ||
-+ (index && !(index % SLOT_TREE_NODE_STORE_SIZE))) {
-+ spin_unlock(&vma_slot_list_lock);
-+
-+ if (index && !(index % SLOT_TREE_NODE_STORE_SIZE)) {
-+ uksm_vma_enter(batch_slots, index);
-+ index = 0;
-+ }
-+ i = 0;
-+ cond_resched();
-+ spin_lock(&vma_slot_list_lock);
-+ }
-+ }
-+
-+ list_splice(&empty_vma_list, &vma_slot_new);
-+
-+ spin_unlock(&vma_slot_list_lock);
-+
-+ if (index)
-+ uksm_vma_enter(batch_slots, index);
-+
-+}
-+
-+static inline int rung_round_finished(struct scan_rung *rung)
-+{
-+ return rung->flags & UKSM_RUNG_ROUND_FINISHED;
-+}
-+
-+static inline void judge_slot(struct vma_slot *slot)
-+{
-+ struct scan_rung *rung = slot->rung;
-+ unsigned long dedup;
-+ int deleted;
-+
-+ dedup = cal_dedup_ratio(slot);
-+ if (vma_fully_scanned(slot) && uksm_thrash_threshold)
-+ deleted = vma_rung_enter(slot, &uksm_scan_ladder[0]);
-+ else if (dedup && dedup >= uksm_abundant_threshold)
-+ deleted = vma_rung_up(slot);
-+ else
-+ deleted = vma_rung_down(slot);
-+
-+ slot->pages_merged = 0;
-+ slot->pages_cowed = 0;
-+
-+ if (vma_fully_scanned(slot))
-+ slot->pages_scanned = 0;
-+
-+ slot->last_scanned = slot->pages_scanned;
-+
-+ /* If its deleted in above, then rung was already advanced. */
-+ if (!deleted)
-+ advance_current_scan(rung);
-+}
-+
-+
-+static inline int hash_round_finished(void)
-+{
-+ if (scanned_virtual_pages > (uksm_pages_total >> 2)) {
-+ scanned_virtual_pages = 0;
-+ if (uksm_pages_scanned)
-+ fully_scanned_round++;
-+
-+ return 1;
-+ } else {
-+ return 0;
-+ }
-+}
-+
-+#define UKSM_MMSEM_BATCH 5
-+#define BUSY_RETRY 100
-+
-+/**
-+ * uksm_do_scan() - the main worker function.
-+ */
-+static noinline void uksm_do_scan(void)
-+{
-+ struct vma_slot *slot, *iter;
-+ struct mm_struct *busy_mm;
-+ unsigned char round_finished, all_rungs_emtpy;
-+ int i, err, mmsem_batch;
-+ unsigned long pcost;
-+ long long delta_exec;
-+ unsigned long vpages, max_cpu_ratio;
-+ unsigned long long start_time, end_time, scan_time;
-+ unsigned int expected_jiffies;
-+
-+ might_sleep();
-+
-+ vpages = 0;
-+
-+ start_time = task_sched_runtime(current);
-+ max_cpu_ratio = 0;
-+ mmsem_batch = 0;
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE;) {
-+ struct scan_rung *rung = &uksm_scan_ladder[i];
-+ unsigned long ratio;
-+ int busy_retry;
-+
-+ if (!rung->pages_to_scan) {
-+ i++;
-+ continue;
-+ }
-+
-+ if (!rung->vma_root.num) {
-+ rung->pages_to_scan = 0;
-+ i++;
-+ continue;
-+ }
-+
-+ ratio = rung_real_ratio(rung->cpu_ratio);
-+ if (ratio > max_cpu_ratio)
-+ max_cpu_ratio = ratio;
-+
-+ busy_retry = BUSY_RETRY;
-+ /*
-+ * Do not consider rung_round_finished() here, just used up the
-+ * rung->pages_to_scan quota.
-+ */
-+ while (rung->pages_to_scan && rung->vma_root.num &&
-+ likely(!freezing(current))) {
-+ int reset = 0;
-+
-+ slot = rung->current_scan;
-+
-+ BUG_ON(vma_fully_scanned(slot));
-+
-+ if (mmsem_batch) {
-+ err = 0;
-+ } else {
-+ err = try_down_read_slot_mmap_sem(slot);
-+ }
-+
-+ if (err == -ENOENT) {
-+rm_slot:
-+ rung_rm_slot(slot);
-+ continue;
-+ }
-+
-+ busy_mm = slot->mm;
-+
-+ if (err == -EBUSY) {
-+ /* skip other vmas on the same mm */
-+ do {
-+ reset = advance_current_scan(rung);
-+ iter = rung->current_scan;
-+ busy_retry--;
-+ if (iter->vma->vm_mm != busy_mm ||
-+ !busy_retry || reset)
-+ break;
-+ } while (1);
-+
-+ if (iter->vma->vm_mm != busy_mm) {
-+ continue;
-+ } else {
-+ /* scan round finsished */
-+ break;
-+ }
-+ }
-+
-+ BUG_ON(!vma_can_enter(slot->vma));
-+ if (uksm_test_exit(slot->vma->vm_mm)) {
-+ mmsem_batch = 0;
-+ up_read(&slot->vma->vm_mm->mmap_sem);
-+ goto rm_slot;
-+ }
-+
-+ if (mmsem_batch)
-+ mmsem_batch--;
-+ else
-+ mmsem_batch = UKSM_MMSEM_BATCH;
-+
-+ /* Ok, we have take the mmap_sem, ready to scan */
-+ scan_vma_one_page(slot);
-+ rung->pages_to_scan--;
-+ vpages++;
-+
-+ if (rung->current_offset + rung->step > slot->pages - 1
-+ || vma_fully_scanned(slot)) {
-+ up_read(&slot->vma->vm_mm->mmap_sem);
-+ judge_slot(slot);
-+ mmsem_batch = 0;
-+ } else {
-+ rung->current_offset += rung->step;
-+ if (!mmsem_batch)
-+ up_read(&slot->vma->vm_mm->mmap_sem);
-+ }
-+
-+ busy_retry = BUSY_RETRY;
-+ cond_resched();
-+ }
-+
-+ if (mmsem_batch) {
-+ up_read(&slot->vma->vm_mm->mmap_sem);
-+ mmsem_batch = 0;
-+ }
-+
-+ if (freezing(current))
-+ break;
-+
-+ cond_resched();
-+ }
-+ end_time = task_sched_runtime(current);
-+ delta_exec = end_time - start_time;
-+
-+ if (freezing(current))
-+ return;
-+
-+ cleanup_vma_slots();
-+ uksm_enter_all_slots();
-+
-+ round_finished = 1;
-+ all_rungs_emtpy = 1;
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ struct scan_rung *rung = &uksm_scan_ladder[i];
-+
-+ if (rung->vma_root.num) {
-+ all_rungs_emtpy = 0;
-+ if (!rung_round_finished(rung))
-+ round_finished = 0;
-+ }
-+ }
-+
-+ if (all_rungs_emtpy)
-+ round_finished = 0;
-+
-+ if (round_finished) {
-+ round_update_ladder();
-+ uksm_eval_round++;
-+
-+ if (hash_round_finished() && rshash_adjust()) {
-+ /* Reset the unstable root iff hash strength changed */
-+ uksm_hash_round++;
-+ root_unstable_tree = RB_ROOT;
-+ free_all_tree_nodes(&unstable_tree_node_list);
-+ }
-+
-+ /*
-+ * A number of pages can hang around indefinitely on per-cpu
-+ * pagevecs, raised page count preventing write_protect_page
-+ * from merging them. Though it doesn't really matter much,
-+ * it is puzzling to see some stuck in pages_volatile until
-+ * other activity jostles them out, and they also prevented
-+ * LTP's KSM test from succeeding deterministically; so drain
-+ * them here (here rather than on entry to uksm_do_scan(),
-+ * so we don't IPI too often when pages_to_scan is set low).
-+ */
-+ lru_add_drain_all();
-+ }
-+
-+
-+ if (vpages && delta_exec > 0) {
-+ pcost = (unsigned long) delta_exec / vpages;
-+ if (likely(uksm_ema_page_time))
-+ uksm_ema_page_time = ema(pcost, uksm_ema_page_time);
-+ else
-+ uksm_ema_page_time = pcost;
-+ }
-+
-+ uksm_calc_scan_pages();
-+ uksm_sleep_real = uksm_sleep_jiffies;
-+ /* in case of radical cpu bursts, apply the upper bound */
-+ end_time = task_sched_runtime(current);
-+ if (max_cpu_ratio && end_time > start_time) {
-+ scan_time = end_time - start_time;
-+ expected_jiffies = msecs_to_jiffies(
-+ scan_time_to_sleep(scan_time, max_cpu_ratio));
-+
-+ if (expected_jiffies > uksm_sleep_real)
-+ uksm_sleep_real = expected_jiffies;
-+
-+ /* We have a 1 second up bound for responsiveness. */
-+ if (jiffies_to_msecs(uksm_sleep_real) > MSEC_PER_SEC)
-+ uksm_sleep_real = msecs_to_jiffies(1000);
-+ }
-+
-+ return;
-+}
-+
-+static int ksmd_should_run(void)
-+{
-+ return uksm_run & UKSM_RUN_MERGE;
-+}
-+
-+static int uksm_scan_thread(void *nothing)
-+{
-+ set_freezable();
-+ set_user_nice(current, 5);
-+
-+ while (!kthread_should_stop()) {
-+ mutex_lock(&uksm_thread_mutex);
-+ if (ksmd_should_run()) {
-+ uksm_do_scan();
-+ }
-+ mutex_unlock(&uksm_thread_mutex);
-+
-+ try_to_freeze();
-+
-+ if (ksmd_should_run()) {
-+ schedule_timeout_interruptible(uksm_sleep_real);
-+ uksm_sleep_times++;
-+ } else {
-+ wait_event_freezable(uksm_thread_wait,
-+ ksmd_should_run() || kthread_should_stop());
-+ }
-+ }
-+ return 0;
-+}
-+
-+int page_referenced_ksm(struct page *page, struct mem_cgroup *memcg,
-+ unsigned long *vm_flags)
-+{
-+ struct stable_node *stable_node;
-+ struct node_vma *node_vma;
-+ struct rmap_item *rmap_item;
-+ unsigned int mapcount = page_mapcount(page);
-+ int referenced = 0;
-+ int search_new_forks = 0;
-+ unsigned long address;
-+
-+ VM_BUG_ON(!PageKsm(page));
-+ VM_BUG_ON(!PageLocked(page));
-+
-+ stable_node = page_stable_node(page);
-+ if (!stable_node)
-+ return 0;
-+
-+
-+again:
-+ hlist_for_each_entry(node_vma, &stable_node->hlist, hlist) {
-+ hlist_for_each_entry(rmap_item, &node_vma->rmap_hlist, hlist) {
-+ struct anon_vma *anon_vma = rmap_item->anon_vma;
-+ struct anon_vma_chain *vmac;
-+ struct vm_area_struct *vma;
-+
-+ anon_vma_lock_read(anon_vma);
-+ anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
-+ 0, ULONG_MAX) {
-+
-+ vma = vmac->vma;
-+ address = get_rmap_addr(rmap_item);
-+
-+ if (address < vma->vm_start ||
-+ address >= vma->vm_end)
-+ continue;
-+ /*
-+ * Initially we examine only the vma which
-+ * covers this rmap_item; but later, if there
-+ * is still work to do, we examine covering
-+ * vmas in other mms: in case they were forked
-+ * from the original since ksmd passed.
-+ */
-+ if ((rmap_item->slot->vma == vma) ==
-+ search_new_forks)
-+ continue;
-+
-+ if (memcg &&
-+ !mm_match_cgroup(vma->vm_mm, memcg))
-+ continue;
-+
-+ referenced +=
-+ page_referenced_one(page, vma,
-+ address, &mapcount, vm_flags);
-+ if (!search_new_forks || !mapcount)
-+ break;
-+ }
-+
-+ anon_vma_unlock_read(anon_vma);
-+ if (!mapcount)
-+ goto out;
-+ }
-+ }
-+ if (!search_new_forks++)
-+ goto again;
-+out:
-+ return referenced;
-+}
-+
-+int try_to_unmap_ksm(struct page *page, enum ttu_flags flags)
-+{
-+ struct stable_node *stable_node;
-+ struct node_vma *node_vma;
-+ struct rmap_item *rmap_item;
-+ int ret = SWAP_AGAIN;
-+ int search_new_forks = 0;
-+ unsigned long address;
-+
-+ VM_BUG_ON(!PageKsm(page));
-+ VM_BUG_ON(!PageLocked(page));
-+
-+ stable_node = page_stable_node(page);
-+ if (!stable_node)
-+ return SWAP_FAIL;
-+again:
-+ hlist_for_each_entry(node_vma, &stable_node->hlist, hlist) {
-+ hlist_for_each_entry(rmap_item, &node_vma->rmap_hlist, hlist) {
-+ struct anon_vma *anon_vma = rmap_item->anon_vma;
-+ struct anon_vma_chain *vmac;
-+ struct vm_area_struct *vma;
-+
-+ anon_vma_lock_read(anon_vma);
-+ anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
-+ 0, ULONG_MAX) {
-+ vma = vmac->vma;
-+ address = get_rmap_addr(rmap_item);
-+
-+ if (address < vma->vm_start ||
-+ address >= vma->vm_end)
-+ continue;
-+ /*
-+ * Initially we examine only the vma which
-+ * covers this rmap_item; but later, if there
-+ * is still work to do, we examine covering
-+ * vmas in other mms: in case they were forked
-+ * from the original since ksmd passed.
-+ */
-+ if ((rmap_item->slot->vma == vma) ==
-+ search_new_forks)
-+ continue;
-+
-+ ret = try_to_unmap_one(page, vma,
-+ address, flags);
-+ if (ret != SWAP_AGAIN || !page_mapped(page)) {
-+ anon_vma_unlock_read(anon_vma);
-+ goto out;
-+ }
-+ }
-+ anon_vma_unlock_read(anon_vma);
-+ }
-+ }
-+ if (!search_new_forks++)
-+ goto again;
-+out:
-+ return ret;
-+}
-+
-+#ifdef CONFIG_MIGRATION
-+int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
-+ struct vm_area_struct *, unsigned long, void *), void *arg)
-+{
-+ struct stable_node *stable_node;
-+ struct node_vma *node_vma;
-+ struct rmap_item *rmap_item;
-+ int ret = SWAP_AGAIN;
-+ int search_new_forks = 0;
-+ unsigned long address;
-+
-+ VM_BUG_ON(!PageKsm(page));
-+ VM_BUG_ON(!PageLocked(page));
-+
-+ stable_node = page_stable_node(page);
-+ if (!stable_node)
-+ return ret;
-+again:
-+ hlist_for_each_entry(node_vma, &stable_node->hlist, hlist) {
-+ hlist_for_each_entry(rmap_item, &node_vma->rmap_hlist, hlist) {
-+ struct anon_vma *anon_vma = rmap_item->anon_vma;
-+ struct anon_vma_chain *vmac;
-+ struct vm_area_struct *vma;
-+
-+ anon_vma_lock_read(anon_vma);
-+ anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
-+ 0, ULONG_MAX) {
-+ vma = vmac->vma;
-+ address = get_rmap_addr(rmap_item);
-+
-+ if (address < vma->vm_start ||
-+ address >= vma->vm_end)
-+ continue;
-+
-+ if ((rmap_item->slot->vma == vma) ==
-+ search_new_forks)
-+ continue;
-+
-+ ret = rmap_one(page, vma, address, arg);
-+ if (ret != SWAP_AGAIN) {
-+ anon_vma_unlock_read(anon_vma);
-+ goto out;
-+ }
-+ }
-+ anon_vma_unlock_read(anon_vma);
-+ }
-+ }
-+ if (!search_new_forks++)
-+ goto again;
-+out:
-+ return ret;
-+}
-+
-+/* Common ksm interface but may be specific to uksm */
-+void ksm_migrate_page(struct page *newpage, struct page *oldpage)
-+{
-+ struct stable_node *stable_node;
-+
-+ VM_BUG_ON(!PageLocked(oldpage));
-+ VM_BUG_ON(!PageLocked(newpage));
-+ VM_BUG_ON(newpage->mapping != oldpage->mapping);
-+
-+ stable_node = page_stable_node(newpage);
-+ if (stable_node) {
-+ VM_BUG_ON(stable_node->kpfn != page_to_pfn(oldpage));
-+ stable_node->kpfn = page_to_pfn(newpage);
-+ }
-+}
-+#endif /* CONFIG_MIGRATION */
-+
-+#ifdef CONFIG_MEMORY_HOTREMOVE
-+static struct stable_node *uksm_check_stable_tree(unsigned long start_pfn,
-+ unsigned long end_pfn)
-+{
-+ struct rb_node *node;
-+
-+ for (node = rb_first(root_stable_treep); node; node = rb_next(node)) {
-+ struct stable_node *stable_node;
-+
-+ stable_node = rb_entry(node, struct stable_node, node);
-+ if (stable_node->kpfn >= start_pfn &&
-+ stable_node->kpfn < end_pfn)
-+ return stable_node;
-+ }
-+ return NULL;
-+}
-+
-+static int uksm_memory_callback(struct notifier_block *self,
-+ unsigned long action, void *arg)
-+{
-+ struct memory_notify *mn = arg;
-+ struct stable_node *stable_node;
-+
-+ switch (action) {
-+ case MEM_GOING_OFFLINE:
-+ /*
-+ * Keep it very simple for now: just lock out ksmd and
-+ * MADV_UNMERGEABLE while any memory is going offline.
-+ * mutex_lock_nested() is necessary because lockdep was alarmed
-+ * that here we take uksm_thread_mutex inside notifier chain
-+ * mutex, and later take notifier chain mutex inside
-+ * uksm_thread_mutex to unlock it. But that's safe because both
-+ * are inside mem_hotplug_mutex.
-+ */
-+ mutex_lock_nested(&uksm_thread_mutex, SINGLE_DEPTH_NESTING);
-+ break;
-+
-+ case MEM_OFFLINE:
-+ /*
-+ * Most of the work is done by page migration; but there might
-+ * be a few stable_nodes left over, still pointing to struct
-+ * pages which have been offlined: prune those from the tree.
-+ */
-+ while ((stable_node = uksm_check_stable_tree(mn->start_pfn,
-+ mn->start_pfn + mn->nr_pages)) != NULL)
-+ remove_node_from_stable_tree(stable_node, 1, 1);
-+ /* fallthrough */
-+
-+ case MEM_CANCEL_OFFLINE:
-+ mutex_unlock(&uksm_thread_mutex);
-+ break;
-+ }
-+ return NOTIFY_OK;
-+}
-+#endif /* CONFIG_MEMORY_HOTREMOVE */
-+
-+#ifdef CONFIG_SYSFS
-+/*
-+ * This all compiles without CONFIG_SYSFS, but is a waste of space.
-+ */
-+
-+#define UKSM_ATTR_RO(_name) \
-+ static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
-+#define UKSM_ATTR(_name) \
-+ static struct kobj_attribute _name##_attr = \
-+ __ATTR(_name, 0644, _name##_show, _name##_store)
-+
-+static ssize_t max_cpu_percentage_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%u\n", uksm_max_cpu_percentage);
-+}
-+
-+static ssize_t max_cpu_percentage_store(struct kobject *kobj,
-+ struct kobj_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ unsigned long max_cpu_percentage;
-+ int err;
-+
-+ err = strict_strtoul(buf, 10, &max_cpu_percentage);
-+ if (err || max_cpu_percentage > 100)
-+ return -EINVAL;
-+
-+ if (max_cpu_percentage == 100)
-+ max_cpu_percentage = 99;
-+ else if (max_cpu_percentage < 10)
-+ max_cpu_percentage = 10;
-+
-+ uksm_max_cpu_percentage = max_cpu_percentage;
-+
-+ return count;
-+}
-+UKSM_ATTR(max_cpu_percentage);
-+
-+static ssize_t sleep_millisecs_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%u\n", jiffies_to_msecs(uksm_sleep_jiffies));
-+}
-+
-+static ssize_t sleep_millisecs_store(struct kobject *kobj,
-+ struct kobj_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ unsigned long msecs;
-+ int err;
-+
-+ err = strict_strtoul(buf, 10, &msecs);
-+ if (err || msecs > MSEC_PER_SEC)
-+ return -EINVAL;
-+
-+ uksm_sleep_jiffies = msecs_to_jiffies(msecs);
-+ uksm_sleep_saved = uksm_sleep_jiffies;
-+
-+ return count;
-+}
-+UKSM_ATTR(sleep_millisecs);
-+
-+
-+static ssize_t cpu_governor_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ int n = sizeof(uksm_cpu_governor_str) / sizeof(char *);
-+ int i;
-+
-+ buf[0] = '\0';
-+ for (i = 0; i < n ; i++) {
-+ if (uksm_cpu_governor == i)
-+ strcat(buf, "[");
-+
-+ strcat(buf, uksm_cpu_governor_str[i]);
-+
-+ if (uksm_cpu_governor == i)
-+ strcat(buf, "]");
-+
-+ strcat(buf, " ");
-+ }
-+ strcat(buf, "\n");
-+
-+ return strlen(buf);
-+}
-+
-+static inline void init_performance_values(void)
-+{
-+ int i;
-+ struct scan_rung *rung;
-+ struct uksm_cpu_preset_s *preset = uksm_cpu_preset + uksm_cpu_governor;
-+
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ rung = uksm_scan_ladder + i;
-+ rung->cpu_ratio = preset->cpu_ratio[i];
-+ rung->cover_msecs = preset->cover_msecs[i];
-+ }
-+
-+ uksm_max_cpu_percentage = preset->max_cpu;
-+}
-+
-+static ssize_t cpu_governor_store(struct kobject *kobj,
-+ struct kobj_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ int n = sizeof(uksm_cpu_governor_str) / sizeof(char *);
-+
-+ for (n--; n >=0 ; n--) {
-+ if (!strncmp(buf, uksm_cpu_governor_str[n],
-+ strlen(uksm_cpu_governor_str[n])))
-+ break;
-+ }
-+
-+ if (n < 0)
-+ return -EINVAL;
-+ else
-+ uksm_cpu_governor = n;
-+
-+ init_performance_values();
-+
-+ return count;
-+}
-+UKSM_ATTR(cpu_governor);
-+
-+static ssize_t run_show(struct kobject *kobj, struct kobj_attribute *attr,
-+ char *buf)
-+{
-+ return sprintf(buf, "%u\n", uksm_run);
-+}
-+
-+static ssize_t run_store(struct kobject *kobj, struct kobj_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ int err;
-+ unsigned long flags;
-+
-+ err = strict_strtoul(buf, 10, &flags);
-+ if (err || flags > UINT_MAX)
-+ return -EINVAL;
-+ if (flags > UKSM_RUN_MERGE)
-+ return -EINVAL;
-+
-+ mutex_lock(&uksm_thread_mutex);
-+ if (uksm_run != flags) {
-+ uksm_run = flags;
-+ }
-+ mutex_unlock(&uksm_thread_mutex);
-+
-+ if (flags & UKSM_RUN_MERGE)
-+ wake_up_interruptible(&uksm_thread_wait);
-+
-+ return count;
-+}
-+UKSM_ATTR(run);
-+
-+static ssize_t abundant_threshold_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%u\n", uksm_abundant_threshold);
-+}
-+
-+static ssize_t abundant_threshold_store(struct kobject *kobj,
-+ struct kobj_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ int err;
-+ unsigned long flags;
-+
-+ err = strict_strtoul(buf, 10, &flags);
-+ if (err || flags > 99)
-+ return -EINVAL;
-+
-+ uksm_abundant_threshold = flags;
-+
-+ return count;
-+}
-+UKSM_ATTR(abundant_threshold);
-+
-+static ssize_t thrash_threshold_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%u\n", uksm_thrash_threshold);
-+}
-+
-+static ssize_t thrash_threshold_store(struct kobject *kobj,
-+ struct kobj_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ int err;
-+ unsigned long flags;
-+
-+ err = strict_strtoul(buf, 10, &flags);
-+ if (err || flags > 99)
-+ return -EINVAL;
-+
-+ uksm_thrash_threshold = flags;
-+
-+ return count;
-+}
-+UKSM_ATTR(thrash_threshold);
-+
-+static ssize_t cpu_ratios_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ int i, size;
-+ struct scan_rung *rung;
-+ char *p = buf;
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ rung = &uksm_scan_ladder[i];
-+
-+ if (rung->cpu_ratio > 0)
-+ size = sprintf(p, "%d ", rung->cpu_ratio);
-+ else
-+ size = sprintf(p, "MAX/%d ",
-+ TIME_RATIO_SCALE / -rung->cpu_ratio);
-+
-+ p += size;
-+ }
-+
-+ *p++ = '\n';
-+ *p = '\0';
-+
-+ return p - buf;
-+}
-+
-+static ssize_t cpu_ratios_store(struct kobject *kobj,
-+ struct kobj_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ int i, cpuratios[SCAN_LADDER_SIZE], err;
-+ unsigned long value;
-+ struct scan_rung *rung;
-+ char *p, *end = NULL;
-+
-+ p = kzalloc(count, GFP_KERNEL);
-+ if (!p)
-+ return -ENOMEM;
-+
-+ memcpy(p, buf, count);
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ if (i != SCAN_LADDER_SIZE -1) {
-+ end = strchr(p, ' ');
-+ if (!end)
-+ return -EINVAL;
-+
-+ *end = '\0';
-+ }
-+
-+ if (strstr(p, "MAX/")) {
-+ p = strchr(p, '/') + 1;
-+ err = strict_strtoul(p, 10, &value);
-+ if (err || value > TIME_RATIO_SCALE || !value)
-+ return -EINVAL;
-+
-+ cpuratios[i] = - (int) (TIME_RATIO_SCALE / value);
-+ } else {
-+ err = strict_strtoul(p, 10, &value);
-+ if (err || value > TIME_RATIO_SCALE || !value)
-+ return -EINVAL;
-+
-+ cpuratios[i] = value;
-+ }
-+
-+ p = end + 1;
-+ }
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ rung = &uksm_scan_ladder[i];
-+
-+ rung->cpu_ratio = cpuratios[i];
-+ }
-+
-+ return count;
-+}
-+UKSM_ATTR(cpu_ratios);
-+
-+static ssize_t eval_intervals_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ int i, size;
-+ struct scan_rung *rung;
-+ char *p = buf;
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ rung = &uksm_scan_ladder[i];
-+ size = sprintf(p, "%u ", rung->cover_msecs);
-+ p += size;
-+ }
-+
-+ *p++ = '\n';
-+ *p = '\0';
-+
-+ return p - buf;
-+}
-+
-+static ssize_t eval_intervals_store(struct kobject *kobj,
-+ struct kobj_attribute *attr,
-+ const char *buf, size_t count)
-+{
-+ int i, err;
-+ unsigned long values[SCAN_LADDER_SIZE];
-+ struct scan_rung *rung;
-+ char *p, *end = NULL;
-+
-+ p = kzalloc(count, GFP_KERNEL);
-+ if (!p)
-+ return -ENOMEM;
-+
-+ memcpy(p, buf, count);
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ if (i != SCAN_LADDER_SIZE -1) {
-+ end = strchr(p, ' ');
-+ if (!end)
-+ return -EINVAL;
-+
-+ *end = '\0';
-+ }
-+
-+ err = strict_strtoul(p, 10, &values[i]);
-+ if (err)
-+ return -EINVAL;
-+
-+ p = end + 1;
-+ }
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ rung = &uksm_scan_ladder[i];
-+
-+ rung->cover_msecs = values[i];
-+ }
-+
-+ return count;
-+}
-+UKSM_ATTR(eval_intervals);
-+
-+static ssize_t ema_per_page_time_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%lu\n", uksm_ema_page_time);
-+}
-+UKSM_ATTR_RO(ema_per_page_time);
-+
-+static ssize_t pages_shared_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%lu\n", uksm_pages_shared);
-+}
-+UKSM_ATTR_RO(pages_shared);
-+
-+static ssize_t pages_sharing_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%lu\n", uksm_pages_sharing);
-+}
-+UKSM_ATTR_RO(pages_sharing);
-+
-+static ssize_t pages_unshared_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%lu\n", uksm_pages_unshared);
-+}
-+UKSM_ATTR_RO(pages_unshared);
-+
-+static ssize_t full_scans_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%llu\n", fully_scanned_round);
-+}
-+UKSM_ATTR_RO(full_scans);
-+
-+static ssize_t pages_scanned_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ unsigned long base = 0;
-+ u64 delta, ret;
-+
-+ if (pages_scanned_stored) {
-+ base = pages_scanned_base;
-+ ret = pages_scanned_stored;
-+ delta = uksm_pages_scanned >> base;
-+ if (CAN_OVERFLOW_U64(ret, delta)) {
-+ ret >>= 1;
-+ delta >>= 1;
-+ base++;
-+ ret += delta;
-+ }
-+ } else {
-+ ret = uksm_pages_scanned;
-+ }
-+
-+ while (ret > ULONG_MAX) {
-+ ret >>= 1;
-+ base++;
-+ }
-+
-+ if (base)
-+ return sprintf(buf, "%lu * 2^%lu\n", (unsigned long)ret, base);
-+ else
-+ return sprintf(buf, "%lu\n", (unsigned long)ret);
-+}
-+UKSM_ATTR_RO(pages_scanned);
-+
-+static ssize_t hash_strength_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%lu\n", hash_strength);
-+}
-+UKSM_ATTR_RO(hash_strength);
-+
-+static ssize_t sleep_times_show(struct kobject *kobj,
-+ struct kobj_attribute *attr, char *buf)
-+{
-+ return sprintf(buf, "%llu\n", uksm_sleep_times);
-+}
-+UKSM_ATTR_RO(sleep_times);
-+
-+
-+static struct attribute *uksm_attrs[] = {
-+ &max_cpu_percentage_attr.attr,
-+ &sleep_millisecs_attr.attr,
-+ &cpu_governor_attr.attr,
-+ &run_attr.attr,
-+ &ema_per_page_time_attr.attr,
-+ &pages_shared_attr.attr,
-+ &pages_sharing_attr.attr,
-+ &pages_unshared_attr.attr,
-+ &full_scans_attr.attr,
-+ &pages_scanned_attr.attr,
-+ &hash_strength_attr.attr,
-+ &sleep_times_attr.attr,
-+ &thrash_threshold_attr.attr,
-+ &abundant_threshold_attr.attr,
-+ &cpu_ratios_attr.attr,
-+ &eval_intervals_attr.attr,
-+ NULL,
-+};
-+
-+static struct attribute_group uksm_attr_group = {
-+ .attrs = uksm_attrs,
-+ .name = "uksm",
-+};
-+#endif /* CONFIG_SYSFS */
-+
-+static inline void init_scan_ladder(void)
-+{
-+ int i;
-+ struct scan_rung *rung;
-+
-+ for (i = 0; i < SCAN_LADDER_SIZE; i++) {
-+ rung = uksm_scan_ladder + i;
-+ slot_tree_init_root(&rung->vma_root);
-+ }
-+
-+ init_performance_values();
-+ uksm_calc_scan_pages();
-+}
-+
-+static inline int cal_positive_negative_costs(void)
-+{
-+ struct page *p1, *p2;
-+ unsigned char *addr1, *addr2;
-+ unsigned long i, time_start, hash_cost;
-+ unsigned long loopnum = 0;
-+
-+ /*IMPORTANT: volatile is needed to prevent over-optimization by gcc. */
-+ volatile u32 hash;
-+ volatile int ret;
-+
-+ p1 = alloc_page(GFP_KERNEL);
-+ if (!p1)
-+ return -ENOMEM;
-+
-+ p2 = alloc_page(GFP_KERNEL);
-+ if (!p2)
-+ return -ENOMEM;
-+
-+ addr1 = kmap_atomic(p1);
-+ addr2 = kmap_atomic(p2);
-+ memset(addr1, prandom_u32(), PAGE_SIZE);
-+ memcpy(addr2, addr1, PAGE_SIZE);
-+
-+ /* make sure that the two pages differ in last byte */
-+ addr2[PAGE_SIZE-1] = ~addr2[PAGE_SIZE-1];
-+ kunmap_atomic(addr2);
-+ kunmap_atomic(addr1);
-+
-+ time_start = jiffies;
-+ while (jiffies - time_start < 100) {
-+ for (i = 0; i < 100; i++)
-+ hash = page_hash(p1, HASH_STRENGTH_FULL, 0);
-+ loopnum += 100;
-+ }
-+ hash_cost = (jiffies - time_start);
-+
-+ time_start = jiffies;
-+ for (i = 0; i < loopnum; i++)
-+ ret = pages_identical(p1, p2);
-+ memcmp_cost = HASH_STRENGTH_FULL * (jiffies - time_start);
-+ memcmp_cost /= hash_cost;
-+ printk(KERN_INFO "UKSM: relative memcmp_cost = %lu "
-+ "hash=%u cmp_ret=%d.\n",
-+ memcmp_cost, hash, ret);
-+
-+ __free_page(p1);
-+ __free_page(p2);
-+ return 0;
-+}
-+
-+static int init_zeropage_hash_table(void)
-+{
-+ struct page *page;
-+ char *addr;
-+ int i;
-+
-+ page = alloc_page(GFP_KERNEL);
-+ if (!page)
-+ return -ENOMEM;
-+
-+ addr = kmap_atomic(page);
-+ memset(addr, 0, PAGE_SIZE);
-+ kunmap_atomic(addr);
-+
-+ zero_hash_table = kmalloc(HASH_STRENGTH_MAX * sizeof(u32),
-+ GFP_KERNEL);
-+ if (!zero_hash_table)
-+ return -ENOMEM;
-+
-+ for (i = 0; i < HASH_STRENGTH_MAX; i++)
-+ zero_hash_table[i] = page_hash(page, i, 0);
-+
-+ __free_page(page);
-+
-+ return 0;
-+}
-+
-+static inline int init_random_sampling(void)
-+{
-+ unsigned long i;
-+ random_nums = kmalloc(PAGE_SIZE, GFP_KERNEL);
-+ if (!random_nums)
-+ return -ENOMEM;
-+
-+ for (i = 0; i < HASH_STRENGTH_FULL; i++)
-+ random_nums[i] = i;
-+
-+ for (i = 0; i < HASH_STRENGTH_FULL; i++) {
-+ unsigned long rand_range, swap_index, tmp;
-+
-+ rand_range = HASH_STRENGTH_FULL - i;
-+ swap_index = i + prandom_u32() % rand_range;
-+ tmp = random_nums[i];
-+ random_nums[i] = random_nums[swap_index];
-+ random_nums[swap_index] = tmp;
-+ }
-+
-+ rshash_state.state = RSHASH_NEW;
-+ rshash_state.below_count = 0;
-+ rshash_state.lookup_window_index = 0;
-+
-+ return cal_positive_negative_costs();
-+}
-+
-+static int __init uksm_slab_init(void)
-+{
-+ rmap_item_cache = UKSM_KMEM_CACHE(rmap_item, 0);
-+ if (!rmap_item_cache)
-+ goto out;
-+
-+ stable_node_cache = UKSM_KMEM_CACHE(stable_node, 0);
-+ if (!stable_node_cache)
-+ goto out_free1;
-+
-+ node_vma_cache = UKSM_KMEM_CACHE(node_vma, 0);
-+ if (!node_vma_cache)
-+ goto out_free2;
-+
-+ vma_slot_cache = UKSM_KMEM_CACHE(vma_slot, 0);
-+ if (!vma_slot_cache)
-+ goto out_free3;
-+
-+ tree_node_cache = UKSM_KMEM_CACHE(tree_node, 0);
-+ if (!tree_node_cache)
-+ goto out_free4;
-+
-+ return 0;
-+
-+out_free4:
-+ kmem_cache_destroy(vma_slot_cache);
-+out_free3:
-+ kmem_cache_destroy(node_vma_cache);
-+out_free2:
-+ kmem_cache_destroy(stable_node_cache);
-+out_free1:
-+ kmem_cache_destroy(rmap_item_cache);
-+out:
-+ return -ENOMEM;
-+}
-+
-+static void __init uksm_slab_free(void)
-+{
-+ kmem_cache_destroy(stable_node_cache);
-+ kmem_cache_destroy(rmap_item_cache);
-+ kmem_cache_destroy(node_vma_cache);
-+ kmem_cache_destroy(vma_slot_cache);
-+ kmem_cache_destroy(tree_node_cache);
-+}
-+
-+/* Common interface to ksm, different to it. */
-+int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
-+ unsigned long end, int advice, unsigned long *vm_flags)
-+{
-+ int err;
-+
-+ switch (advice) {
-+ case MADV_MERGEABLE:
-+ return 0; /* just ignore the advice */
-+
-+ case MADV_UNMERGEABLE:
-+ if (!(*vm_flags & VM_MERGEABLE))
-+ return 0; /* just ignore the advice */
-+
-+ if (vma->anon_vma) {
-+ err = unmerge_uksm_pages(vma, start, end);
-+ if (err)
-+ return err;
-+ }
-+
-+ uksm_remove_vma(vma);
-+ *vm_flags &= ~VM_MERGEABLE;
-+ break;
-+ }
-+
-+ return 0;
-+}
-+
-+/* Common interface to ksm, actually the same. */
-+struct page *ksm_might_need_to_copy(struct page *page,
-+ struct vm_area_struct *vma, unsigned long address)
-+{
-+ struct anon_vma *anon_vma = page_anon_vma(page);
-+ struct page *new_page;
-+
-+ if (PageKsm(page)) {
-+ if (page_stable_node(page))
-+ return page; /* no need to copy it */
-+ } else if (!anon_vma) {
-+ return page; /* no need to copy it */
-+ } else if (anon_vma->root == vma->anon_vma->root &&
-+ page->index == linear_page_index(vma, address)) {
-+ return page; /* still no need to copy it */
-+ }
-+ if (!PageUptodate(page))
-+ return page; /* let do_swap_page report the error */
-+
-+ new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
-+ if (new_page) {
-+ copy_user_highpage(new_page, page, address, vma);
-+
-+ SetPageDirty(new_page);
-+ __SetPageUptodate(new_page);
-+ __set_page_locked(new_page);
-+ }
-+
-+ return new_page;
-+}
-+
-+static int __init uksm_init(void)
-+{
-+ struct task_struct *uksm_thread;
-+ int err;
-+
-+ uksm_sleep_jiffies = msecs_to_jiffies(100);
-+ uksm_sleep_saved = uksm_sleep_jiffies;
-+
-+ slot_tree_init();
-+ init_scan_ladder();
-+
-+
-+ err = init_random_sampling();
-+ if (err)
-+ goto out_free2;
-+
-+ err = uksm_slab_init();
-+ if (err)
-+ goto out_free1;
-+
-+ err = init_zeropage_hash_table();
-+ if (err)
-+ goto out_free0;
-+
-+ uksm_thread = kthread_run(uksm_scan_thread, NULL, "uksmd");
-+ if (IS_ERR(uksm_thread)) {
-+ printk(KERN_ERR "uksm: creating kthread failed\n");
-+ err = PTR_ERR(uksm_thread);
-+ goto out_free;
-+ }
-+
-+#ifdef CONFIG_SYSFS
-+ err = sysfs_create_group(mm_kobj, &uksm_attr_group);
-+ if (err) {
-+ printk(KERN_ERR "uksm: register sysfs failed\n");
-+ kthread_stop(uksm_thread);
-+ goto out_free;
-+ }
-+#else
-+ uksm_run = UKSM_RUN_MERGE; /* no way for user to start it */
-+
-+#endif /* CONFIG_SYSFS */
-+
-+#ifdef CONFIG_MEMORY_HOTREMOVE
-+ /*
-+ * Choose a high priority since the callback takes uksm_thread_mutex:
-+ * later callbacks could only be taking locks which nest within that.
-+ */
-+ hotplug_memory_notifier(uksm_memory_callback, 100);
-+#endif
-+ return 0;
-+
-+out_free:
-+ kfree(zero_hash_table);
-+out_free0:
-+ uksm_slab_free();
-+out_free1:
-+ kfree(random_nums);
-+out_free2:
-+ kfree(uksm_scan_ladder);
-+ return err;
-+}
-+
-+#ifdef MODULE
-+module_init(uksm_init)
-+#else
-+late_initcall(uksm_init);
-+#endif
-+
-diff --git a/mm/vmstat.c b/mm/vmstat.c
-index f42745e..1796e0c 100644
---- a/mm/vmstat.c
-+++ b/mm/vmstat.c
-@@ -739,6 +739,9 @@ const char * const vmstat_text[] = {
- #endif
- "nr_anon_transparent_hugepages",
- "nr_free_cma",
-+#ifdef CONFIG_UKSM
-+ "nr_uksm_zero_pages",
-+#endif
- "nr_dirty_threshold",
- "nr_dirty_background_threshold",
-
diff --git a/sys-kernel/kogaion-sources/files/security/0001-x86-x32-Correct-invalid-use-of-user-timespec-in-the-.patch b/sys-kernel/kogaion-sources/files/security/0001-x86-x32-Correct-invalid-use-of-user-timespec-in-the-.patch
deleted file mode 100644
index 3f1bccc8..00000000
--- a/sys-kernel/kogaion-sources/files/security/0001-x86-x32-Correct-invalid-use-of-user-timespec-in-the-.patch
+++ /dev/null
@@ -1,80 +0,0 @@
-From 2def2ef2ae5f3990aabdbe8a755911902707d268 Mon Sep 17 00:00:00 2001
-From: PaX Team <pageexec@freemail.hu>
-Date: Thu, 30 Jan 2014 16:59:25 -0800
-Subject: [PATCH] x86, x32: Correct invalid use of user timespec in the kernel
-
-The x32 case for the recvmsg() timout handling is broken:
-
- asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
- unsigned int vlen, unsigned int flags,
- struct compat_timespec __user *timeout)
- {
- int datagrams;
- struct timespec ktspec;
-
- if (flags & MSG_CMSG_COMPAT)
- return -EINVAL;
-
- if (COMPAT_USE_64BIT_TIME)
- return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
- flags | MSG_CMSG_COMPAT,
- (struct timespec *) timeout);
- ...
-
-The timeout pointer parameter is provided by userland (hence the __user
-annotation) but for x32 syscalls it's simply cast to a kernel pointer
-and is passed to __sys_recvmmsg which will eventually directly
-dereference it for both reading and writing. Other callers to
-__sys_recvmmsg properly copy from userland to the kernel first.
-
-The bug was introduced by commit ee4fa23c4bfc ("compat: Use
-COMPAT_USE_64BIT_TIME in net/compat.c") and should affect all kernels
-since 3.4 (and perhaps vendor kernels if they backported x32 support
-along with this code).
-
-Note that CONFIG_X86_X32_ABI gets enabled at build time and only if
-CONFIG_X86_X32 is enabled and ld can build x32 executables.
-
-Other uses of COMPAT_USE_64BIT_TIME seem fine.
-
-This addresses CVE-2014-0038.
-
-Signed-off-by: PaX Team <pageexec@freemail.hu>
-Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
-Cc: <stable@vger.kernel.org> # v3.4+
-Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
----
- net/compat.c | 9 ++-------
- 1 file changed, 2 insertions(+), 7 deletions(-)
-
-diff --git a/net/compat.c b/net/compat.c
-index dd32e34..f50161f 100644
---- a/net/compat.c
-+++ b/net/compat.c
-@@ -780,21 +780,16 @@ asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
- if (flags & MSG_CMSG_COMPAT)
- return -EINVAL;
-
-- if (COMPAT_USE_64BIT_TIME)
-- return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
-- flags | MSG_CMSG_COMPAT,
-- (struct timespec *) timeout);
--
- if (timeout == NULL)
- return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
- flags | MSG_CMSG_COMPAT, NULL);
-
-- if (get_compat_timespec(&ktspec, timeout))
-+ if (compat_get_timespec(&ktspec, timeout))
- return -EFAULT;
-
- datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
- flags | MSG_CMSG_COMPAT, &ktspec);
-- if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
-+ if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
- datagrams = -EFAULT;
-
- return datagrams;
---
-1.8.5.3
-
diff --git a/sys-kernel/kogaion-sources/kogaion-sources-3.10.25.ebuild b/sys-kernel/kogaion-sources/kogaion-sources-3.10.25.ebuild
deleted file mode 100644
index dedc361b..00000000
--- a/sys-kernel/kogaion-sources/kogaion-sources-3.10.25.ebuild
+++ /dev/null
@@ -1,55 +0,0 @@
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-inherit eutils
-
-SLOT=$PVR
-CKV=3.10.25
-KV_FULL=${PN}-${PVR}
-EXTRAVERSION=kogaion
-KERNEL_ARCHIVE="linux-${PV}.tar.xz"
-PATCH_ARCHIVE="linux-${PV}-kogaion.tar.gz"
-RESTRICT="binchecks strip mirror"
-LICENSE="GPL-2"
-KEYWORDS="amd64 x86"
-
-IUSE=""
-DEPEND=""
-RDEPEND=""
-DESCRIPTION="Kogaion Linux Kernel Sources"
-HOMEPAGE="http://www.debian.org"
-SRC_URI="https://www.kernel.org/pub/linux/kernel/v3.x/${KERNEL_ARCHIVE}"
-
-S="$WORKDIR/linux-${CKV}"
-
-pkg_setup() {
- export REAL_ARCH="$ARCH"
- unset ARCH ; unset LDFLAGS #will interfere with Makefile if set
-}
-
-src_prepare() {
-
- for p in $(ls ${FILESDIR}/security); do
- epatch -p1 "${FILESDIR}/security/$p" || die
- done
-
- for p in $(ls ${FILESDIR}/desktop) ; do
- epatch -p1 "${FILESDIR}/desktop/$p" || die
- done
-
- rm -f .config || die
-}
-
-src_compile() {
- einfo "Preparing kernel sources for real-world use" || die
- make -s mrproper || die "make mrproper failed"
-}
-
-src_install() {
- dodir /usr/src/linux-${PV}-kogaion || die
- insinto /usr/src/linux-${PV}-kogaion || die
- doins -r "${S}"/* || die
- cd ${D}/usr/src/linux-${PV}-kogaion || die
- make mrproper || die
-}
diff --git a/sys-kernel/kogaion-sources/kogaion-sources-3.12.10.ebuild b/sys-kernel/kogaion-sources/kogaion-sources-3.14.20.ebuild
index 8c29647b..8c29647b 100644
--- a/sys-kernel/kogaion-sources/kogaion-sources-3.12.10.ebuild
+++ b/sys-kernel/kogaion-sources/kogaion-sources-3.14.20.ebuild
diff --git a/sys-kernel/rogentos-sources/Manifest b/sys-kernel/rogentos-sources/Manifest
deleted file mode 100644
index 2eb9bb5f..00000000
--- a/sys-kernel/rogentos-sources/Manifest
+++ /dev/null
@@ -1,2 +0,0 @@
-DIST linux-3.12.10+rogentos.tar.xz 78869944 SHA256 30bf41c01666e250817c286bf069b7a6a93d62d3404ec13c9032304201f3d856 SHA512 9206e5887f7bc24ab4d03e4397499fcda3680bf331de84c9c269ef9ebe0dfbe283449ad1080846dc119fa6d9f502866297288e475ac2e9b3bd059c1ca2e1a125 WHIRLPOOL d0a970d949b65047eb5b46b15df2de88e577806e9f47b6841fed97d646b354b4fa500715eab5bb8f4c81b21ce6e99bd23c8b878eea6d0cec61dde988b8bcf1c1
-DIST linux-3.12.8+rogentos.tar.xz 78802920 SHA256 5a037be36e2d0cf50136e5e5b515642f48d33e9cae47db7d2714585a1e4769f3 SHA512 b48c9e7380f15386f41fb6889547a483e14167ee2923a47f2aff6a124d895207bd8eff25c99bf50f7b988b16270ae1df2bee5cfca5620974c00332bfe360314f WHIRLPOOL 5526d2098dc6a978fa23ffc33ea7cf92bb3691ff077a444570d02e877f0a9a46ad15729570dfb13f4564e70156d4fc1aec6c82442829a45b1ea1b55410de7bd4
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.10.26.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.10.26.ebuild
deleted file mode 100644
index 2cec6130..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.10.26.ebuild
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.10.27.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.10.27.ebuild
deleted file mode 100644
index 2cec6130..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.10.27.ebuild
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.11.10.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.11.10.ebuild
deleted file mode 100644
index 2cec6130..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.11.10.ebuild
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.12.10.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.12.10.ebuild
deleted file mode 100644
index 2cec6130..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.12.10.ebuild
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.12.7.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.12.7.ebuild
deleted file mode 100644
index 2cec6130..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.12.7.ebuild
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.12.8.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.12.8.ebuild
deleted file mode 100644
index 2cec6130..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.12.8.ebuild
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.2-r2.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.2-r2.ebuild
deleted file mode 100644
index 2dc070d1..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.2-r2.ebuild
+++ /dev/null
@@ -1,19 +0,0 @@
-# Copyright 2004-2010 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-ETYPE="sources"
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-inherit rogentos-kernel
-KEYWORDS="~amd64 ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
-
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.4.76.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.4.76.ebuild
deleted file mode 100644
index 2cec6130..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.4.76.ebuild
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.4.77.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.4.77.ebuild
deleted file mode 100644
index 2cec6130..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.4.77.ebuild
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.8.13.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.8.13.ebuild
deleted file mode 100644
index 98efbe4f..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.8.13.ebuild
+++ /dev/null
@@ -1,21 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-K_KERNEL_PATCH_HOTFIXES="${FILESDIR}/0001-rogentos-fix-rogentos-x86-kernel-config.patch"
-inherit rogentos-kernel
-KEYWORDS="~amd64 ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources-3.9.11.ebuild b/sys-kernel/rogentos-sources/rogentos-sources-3.9.11.ebuild
deleted file mode 100644
index 2cec6130..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources-3.9.11.ebuild
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 Kogaion, Argent and ArgOS Linux
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS Linux Standard kernel sources"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"
diff --git a/sys-kernel/rogentos-sources/rogentos-sources.skel b/sys-kernel/rogentos-sources/rogentos-sources.skel
deleted file mode 100644
index 257a14ab..00000000
--- a/sys-kernel/rogentos-sources/rogentos-sources.skel
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2004-2014 RogentOS Team
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=5
-
-K_ROGKERNEL_NAME="rogentos"
-K_ROGKERNEL_URI_CONFIG="yes"
-K_ROGKERNEL_SELF_TARBALL_NAME="rogentos"
-K_ONLY_SOURCES="1"
-K_ROGKERNEL_FORCE_SUBLEVEL="0"
-K_KERNEL_NEW_VERSIONING="1"
-
-inherit rogentos-kernel
-
-KEYWORDS="~amd64 ~arm ~x86"
-DESCRIPTION="Official Kogaion, Argent and ArgOS source ebuild"
-RESTRICT="mirror"
-IUSE="sources_standalone"
-
-DEPEND="${DEPEND}
- sources_standalone? ( !=sys-kernel/linux-rogentos-${PVR} )
- !sources_standalone? ( =sys-kernel/linux-rogentos-${PVR} )"