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sched: Implement demand based update_cfs_load()

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When the system is busy, dilation of rq->next_balance makes lb->update_shares()
insufficiently frequent for threads which don't sleep (no dequeue/enqueue
updates).  Adjust for this by making demand based updates based on the
accumulation of execution time sufficient to wrap our averaging window.

Signed-off-by: Paul Turner <pjt@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20101115234938.291159744@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Turner 2010-11-15 15:47:08 -08:00 committed by Ingo Molnar
parent c66eaf619c
commit 3b3d190ec3
2 changed files with 20 additions and 1 deletions
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9
kernel/sched.c
View File

@ -353,9 +353,16 @@ struct cfs_rq {
*/
unsigned long h_load;
/*
* Maintaining per-cpu shares distribution for group scheduling
*
* load_stamp is the last time we updated the load average
* load_last is the last time we updated the load average and saw load
* load_unacc_exec_time is currently unaccounted execution time
*/
u64 load_avg;
u64 load_period;
u64 load_stamp, load_last;
u64 load_stamp, load_last, load_unacc_exec_time;
unsigned long load_contribution;
#endif

12
kernel/sched_fair.c
View File

@ -539,6 +539,9 @@ static u64 sched_vslice(struct cfs_rq *cfs_rq, struct sched_entity *se)
return calc_delta_fair(sched_slice(cfs_rq, se), se);
}
static void update_cfs_load(struct cfs_rq *cfs_rq);
static void update_cfs_shares(struct cfs_rq *cfs_rq, long weight_delta);
/*
* Update the current task's runtime statistics. Skip current tasks that
* are not in our scheduling class.
@ -558,6 +561,14 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
curr->vruntime += delta_exec_weighted;
update_min_vruntime(cfs_rq);
#ifdef CONFIG_FAIR_GROUP_SCHED
cfs_rq->load_unacc_exec_time += delta_exec;
if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window) {
update_cfs_load(cfs_rq);
update_cfs_shares(cfs_rq, 0);
}
#endif
}
static void update_curr(struct cfs_rq *cfs_rq)
@ -713,6 +724,7 @@ static void update_cfs_load(struct cfs_rq *cfs_rq)
}
cfs_rq->load_stamp = now;
cfs_rq->load_unacc_exec_time = 0;
cfs_rq->load_period += delta;
if (load) {
cfs_rq->load_last = now;