diff options
| author | Paul Turner <pjt@google.com> | 2010-11-15 15:47:06 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-11-18 13:27:49 +0100 |
| commit | a7a4f8a752ec734b2eab904fc863d5dc873de338 (patch) | |
| tree | 18b69c4cc0fc10cf6f0fe429308b25086942d921 | |
| parent | 67e86250f8ea7b8f7da53ac25ea73c6bd71f5cd9 (diff) | |
sched: Add sysctl_sched_shares_window
Introduce a new sysctl for the shares window and disambiguate it from
sched_time_avg.
A 10ms window appears to be a good compromise between accuracy and performance.
Signed-off-by: Paul Turner <pjt@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20101115234938.112173964@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/linux/sched.h | 1 | ||||
| -rw-r--r-- | kernel/sched_fair.c | 9 | ||||
| -rw-r--r-- | kernel/sysctl.c | 7 |
3 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 8abb8aa5966..840f1277492 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1900,6 +1900,7 @@ extern unsigned int sysctl_sched_migration_cost; extern unsigned int sysctl_sched_nr_migrate; extern unsigned int sysctl_sched_time_avg; extern unsigned int sysctl_timer_migration; +extern unsigned int sysctl_sched_shares_window; int sched_proc_update_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index b320753aa6c..6c84439ce98 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -89,6 +89,13 @@ unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL; const_debug unsigned int sysctl_sched_migration_cost = 500000UL; +/* + * The exponential sliding window over which load is averaged for shares + * distribution. + * (default: 10msec) + */ +unsigned int __read_mostly sysctl_sched_shares_window = 10000000UL; + static const struct sched_class fair_sched_class; /************************************************************** @@ -688,7 +695,7 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se) #if defined CONFIG_SMP && defined CONFIG_FAIR_GROUP_SCHED static void update_cfs_load(struct cfs_rq *cfs_rq) { - u64 period = sched_avg_period(); + u64 period = sysctl_sched_shares_window; u64 now, delta; unsigned long load = cfs_rq->load.weight; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 3132b25193d..9b520d74f05 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -333,6 +333,13 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, { + .procname = "sched_shares_window", + .data = &sysctl_sched_shares_window, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { .procname = "timer_migration", .data = &sysctl_timer_migration, .maxlen = sizeof(unsigned int), |