Messages in this thread Patch in this message | | | Date | Fri, 15 Oct 2010 21:43:56 -0700 | From | pjt@google ... | Subject | [RFC tg_shares_up improvements - v1 07/12] 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 | 8 +++++++- kernel/sysctl.c | 7 +++++++ 3 files changed, 15 insertions(+), 1 deletion(-)
Index: kernel/sched_fair.c =================================================================== --- kernel/sched_fair.c.orig +++ kernel/sched_fair.c @@ -89,6 +89,12 @@ unsigned int normalized_sysctl_sched_wak const_debug unsigned int sysctl_sched_migration_cost = 500000UL; +/* + * The usage window over which average use is computed for shares + * distribution. + */ +unsigned int __read_mostly sysctl_sched_shares_window = 10000000UL; + static const struct sched_class fair_sched_class; /************************************************************** @@ -688,7 +694,7 @@ 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: include/linux/sched.h =================================================================== --- include/linux/sched.h.orig +++ include/linux/sched.h @@ -1883,6 +1883,7 @@ 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: kernel/sysctl.c =================================================================== --- kernel/sysctl.c.orig +++ kernel/sysctl.c @@ -337,6 +337,13 @@ 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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