From: Alex Shi alex.shi@intel.com
rq->avg_idle is 'to used to accommodate bursty loads in a dirt simple dirt cheap manner' -- Mike Galbraith.
With this cheap and smart bursty indicator, we can find the wake up burst, and just use nr_running as instant utilization only.
The 'sysctl_sched_burst_threshold' used for wakeup burst, set it as double of sysctl_sched_migration_cost.
Signed-off-by: Alex Shi alex.shi@intel.com [Added CONFIG_SCHED_POWER switch to enable this patch] Signed-off-by: Preeti U Murthy preeti@linux.vnet.ibm.com ---
include/linux/sched/sysctl.h | 3 +++ kernel/sched/fair.c | 4 ++++ kernel/sysctl.c | 9 +++++++++ 3 files changed, 16 insertions(+)
diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index 596a0e0..0a3307b 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -55,6 +55,9 @@ extern unsigned int sysctl_numa_balancing_scan_size;
#ifdef CONFIG_SCHED_DEBUG extern unsigned int sysctl_sched_migration_cost; +#ifdef CONFIG_SCHED_POWER +extern unsigned int sysctl_sched_burst_threshold; +#endif /* CONFIG_SCHED_POWER */ extern unsigned int sysctl_sched_nr_migrate; extern unsigned int sysctl_sched_time_avg; extern unsigned int sysctl_timer_migration; diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 60abaf4..20e2414 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -92,6 +92,10 @@ unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL;
const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
+#ifdef CONFIG_SCHED_POWER +const_debug unsigned int sysctl_sched_burst_threshold = 1000000UL; +#endif + /* * The exponential sliding window over which load is averaged for shares * distribution. diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 75875a7..8175d93 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -329,6 +329,15 @@ static struct ctl_table kern_table[] = { .mode = 0644, .proc_handler = proc_dointvec, }, +#ifdef CONFIG_SCHED_POWER + { + .procname = "sched_burst_threshold_ns", + .data = &sysctl_sched_burst_threshold, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, +#endif /* CONFIG_SCHED_POWER */ { .procname = "sched_nr_migrate", .data = &sysctl_sched_nr_migrate,