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From 250ba4a23f392dd37c673fd3879c6281a3a62291 Mon Sep 17 00:00:00 2001
From: Masahito S <firelzrd@gmail.com>
Date: Mon, 15 May 2023 06:00:52 +0900
Subject: [PATCH] constgran vanilla-max sched: Make latency / granularity
constant tunable_scaling = 1 (logarithmic) -> 0 (constant) latency_ns =
variable 6-24ms -> constant 24ms min_granularity_ns = variable 0.75-3ms ->
constant 3ms wakeup_granularity_ns = variable 1-4ms -> constant 4ms
---
kernel/sched/fair.c | 31 +++++++++++++++++++++++++++----
1 file changed, 27 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 8b5bf7280..340f8dd14 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -36,10 +36,16 @@
* (to see the precise effective timeslice length of your workload,
* run vmstat and monitor the context-switches (cs) field)
*
- * (default: 6ms * (1 + ilog(ncpus)), units: nanoseconds)
+ * (BORE default: 24ms constant, units: nanoseconds)
+ * (CFS default: 6ms * (1 + ilog(ncpus)), units: nanoseconds)
*/
+#ifdef CONFIG_SCHED_BORE
+unsigned int sysctl_sched_latency = 24000000ULL;
+static unsigned int normalized_sysctl_sched_latency = 24000000ULL;
+#else // CONFIG_SCHED_BORE
unsigned int sysctl_sched_latency = 6000000ULL;
static unsigned int normalized_sysctl_sched_latency = 6000000ULL;
+#endif // CONFIG_SCHED_BORE
/*
* The initial- and re-scaling of tunables is configurable
@@ -50,17 +56,28 @@ static unsigned int normalized_sysctl_sched_latency = 6000000ULL;
* SCHED_TUNABLESCALING_LOG - scaled logarithmical, *1+ilog(ncpus)
* SCHED_TUNABLESCALING_LINEAR - scaled linear, *ncpus
*
- * (default SCHED_TUNABLESCALING_LOG = *(1+ilog(ncpus))
+ * (BORE default SCHED_TUNABLESCALING_NONE = *1 constant)
+ * (CFS default SCHED_TUNABLESCALING_LOG = *(1+ilog(ncpus))
*/
+#ifdef CONFIG_SCHED_BORE
+unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
+#else // CONFIG_SCHED_BORE
unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_LOG;
+#endif // CONFIG_SCHED_BORE
/*
* Minimal preemption granularity for CPU-bound tasks:
*
- * (default: 0.75 msec * (1 + ilog(ncpus)), units: nanoseconds)
+ * (BORE default: 3 msec constant, units: nanoseconds)
+ * (CFS default: 0.75 msec * (1 + ilog(ncpus)), units: nanoseconds)
*/
+#ifdef CONFIG_SCHED_BORE
+unsigned int sysctl_sched_min_granularity = 3000000ULL;
+static unsigned int normalized_sysctl_sched_min_granularity = 3000000ULL;
+#else // CONFIG_SCHED_BORE
unsigned int sysctl_sched_min_granularity = 750000ULL;
static unsigned int normalized_sysctl_sched_min_granularity = 750000ULL;
+#endif // CONFIG_SCHED_BORE
/*
* This value is kept at sysctl_sched_latency/sysctl_sched_min_granularity
@@ -80,10 +97,16 @@ unsigned int sysctl_sched_child_runs_first __read_mostly;
* and reduces their over-scheduling. Synchronous workloads will still
* have immediate wakeup/sleep latencies.
*
- * (default: 1 msec * (1 + ilog(ncpus)), units: nanoseconds)
+ * (BORE default: 4 msec constant, units: nanoseconds)
+ * (CFS default: 1 msec * (1 + ilog(ncpus)), units: nanoseconds)
*/
+#ifdef CONFIG_SCHED_BORE
+unsigned int sysctl_sched_wakeup_granularity = 4000000UL;
+static unsigned int normalized_sysctl_sched_wakeup_granularity = 4000000UL;
+#else // CONFIG_SCHED_BORE
unsigned int sysctl_sched_wakeup_granularity = 1000000UL;
static unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL;
+#endif // CONFIG_SCHED_BORE
const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
--
2.25.1
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