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....@intel.com> --- include/linux/sched/sysctl.h | 1 + kernel/sched/fair.c | 1 + kernel/sysctl.c | 7 +++++++ 3 files changed, 9 insertions(+) diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index bf8086b..a3c3d43 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -53,6 +53,7 @@ extern unsigned int sysctl_numa_balancing_settle_count; #ifdef CONFIG_SCHED_DEBUG extern unsigned int sysctl_sched_migration_cost; +extern unsigned int sysctl_sched_burst_threshold; 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 0feeaee..8ac021f 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -91,6 +91,7 @@ unsigned int sysctl_sched_wakeup_granularity = 1000000UL; unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL; const_debug unsigned int sysctl_sched_migration_cost = 500000UL; +const_debug unsigned int sysctl_sched_burst_threshold = 1000000UL; /* * The exponential sliding window over which load is averaged for shares diff --git a/kernel/sysctl.c b/kernel/sysctl.c index afc1dc6..1f23457 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -327,6 +327,13 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, { + .procname = "sched_burst_threshold_ns", + .data = &sysctl_sched_burst_threshold, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { .procname = "sched_nr_migrate", .data = &sysctl_sched_nr_migrate, .maxlen = sizeof(unsigned int), -- 1.7.12 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/