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Code Issues Releases Wiki Activity

sched/pelt: Relax the sync of runnable_sum with runnable_avg

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Similarly to util_avg and util_sum, don't sync runnable_sum with the low
bound of runnable_avg but only ensure that runnable_sum stays in the
correct range.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Link: https://lkml.kernel.org/r/20220111134659.24961-4-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2022-01-11 14:46:58 +01:00 committed by Peter Zijlstra
parent 7ceb771030
commit 95246d1ec8
1 changed files with 19 additions and 14 deletions
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33
kernel/sched/fair.c
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@ -3483,11 +3483,11 @@ update_tg_cfs_util(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq
static inline void
update_tg_cfs_runnable(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
{
long delta = gcfs_rq->avg.runnable_avg - se->avg.runnable_avg;
u32 divider;
long delta_sum, delta_avg = gcfs_rq->avg.runnable_avg - se->avg.runnable_avg;
u32 new_sum, divider;
/* Nothing to update */
if (!delta)
if (!delta_avg)
return;
/*
@ -3498,11 +3498,16 @@ update_tg_cfs_runnable(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cf
/* Set new sched_entity's runnable */
se->avg.runnable_avg = gcfs_rq->avg.runnable_avg;
se->avg.runnable_sum = se->avg.runnable_avg * divider;
new_sum = se->avg.runnable_avg * divider;
delta_sum = (long)new_sum - (long)se->avg.runnable_sum;
se->avg.runnable_sum = new_sum;
/* Update parent cfs_rq runnable */
add_positive(&cfs_rq->avg.runnable_avg, delta);
cfs_rq->avg.runnable_sum = cfs_rq->avg.runnable_avg * divider;
add_positive(&cfs_rq->avg.runnable_avg, delta_avg);
add_positive(&cfs_rq->avg.runnable_sum, delta_sum);
/* See update_cfs_rq_load_avg() */
cfs_rq->avg.runnable_sum = max_t(u32, cfs_rq->avg.runnable_sum,
cfs_rq->avg.runnable_avg * PELT_MIN_DIVIDER);
}
static inline void
@ -3702,7 +3707,10 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
r = removed_runnable;
sub_positive(&sa->runnable_avg, r);
sa->runnable_sum = sa->runnable_avg * divider;
sub_positive(&sa->runnable_sum, r * divider);
/* See sa->util_sum above */
sa->runnable_sum = max_t(u32, sa->runnable_sum,
sa->runnable_avg * PELT_MIN_DIVIDER);
/*
* removed_runnable is the unweighted version of removed_load so we
@ -3789,12 +3797,6 @@ static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
*/
static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
/*
* cfs_rq->avg.period_contrib can be used for both cfs_rq and se.
* See ___update_load_avg() for details.
*/
u32 divider = get_pelt_divider(&cfs_rq->avg);
dequeue_load_avg(cfs_rq, se);
sub_positive(&cfs_rq->avg.util_avg, se->avg.util_avg);
sub_positive(&cfs_rq->avg.util_sum, se->avg.util_sum);
@ -3803,7 +3805,10 @@ static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
cfs_rq->avg.util_avg * PELT_MIN_DIVIDER);
sub_positive(&cfs_rq->avg.runnable_avg, se->avg.runnable_avg);
cfs_rq->avg.runnable_sum = cfs_rq->avg.runnable_avg * divider;
sub_positive(&cfs_rq->avg.runnable_sum, se->avg.runnable_sum);
/* See update_cfs_rq_load_avg() */
cfs_rq->avg.runnable_sum = max_t(u32, cfs_rq->avg.runnable_sum,
cfs_rq->avg.runnable_avg * PELT_MIN_DIVIDER);
add_tg_cfs_propagate(cfs_rq, -se->avg.load_sum);