Messages in this thread Patch in this message | | | Date | Wed, 03 Apr 2013 16:12:02 +0800 | From | Alex Shi <> | Subject | Re: [patch v6 11/21] sched: detect wakeup burst with rq->avg_idle |
| |
On 03/30/2013 10:34 PM, Alex Shi wrote:
The 'sysctl_sched_burst_threshold' used for wakeup burst, since we will check every cpu's avg_idle, the value get be more precise, set 0.1ms.
patch updated. ========
From 67192d87f9656c3e72bc108ef4648de55d470f4a Mon Sep 17 00:00:00 2001 From: Alex Shi <alex.shi@intel.com> Date: Thu, 21 Mar 2013 14:23:00 +0800 Subject: [PATCH 11/21] sched: add sched_burst_threshold_ns as wakeup burst indicator
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, since we will check every cpu's avg_idle, the value get be more precise, set 0.1ms.
Signed-off-by: Alex Shi <alex.shi@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 0c08773..f610313 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 = 100000UL; /* * 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 -- Thanks Alex
| |