Messages in this thread Patch in this message | | | Date | Mon, 15 Nov 2010 15:47:06 -0800 | From | Paul Turner <> | Subject | [tg_shares_up rewrite v4 07/11] sched: add sysctl_sched_shares_window |
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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>
--- include/linux/sched.h | 1 + kernel/sched_fair.c | 9 ++++++++- kernel/sysctl.c | 7 +++++++ 3 files changed, 16 insertions(+), 1 deletion(-)
Index: tip/kernel/sched_fair.c =================================================================== --- tip.orig/kernel/sched_fair.c +++ tip/kernel/sched_fair.c @@ -89,6 +89,13 @@ unsigned int normalized_sysctl_sched_wak 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 *cf #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; Index: tip/include/linux/sched.h =================================================================== --- tip.orig/include/linux/sched.h +++ tip/include/linux/sched.h @@ -1904,6 +1904,7 @@ extern unsigned int sysctl_sched_migrati 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, Index: tip/kernel/sysctl.c =================================================================== --- tip.orig/kernel/sysctl.c +++ tip/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),
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