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sched/pelt: Relax the sync of load_sum with load_avg

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Similarly to util_avg and util_sum, don't sync load_sum with the low
bound of load_avg but only ensure that load_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/20220111134659.24961-5-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2022-01-11 14:46:59 +01:00 committed by Peter Zijlstra
parent 95246d1ec8
commit 2d02fa8cc2
1 changed files with 22 additions and 14 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

36
kernel/sched/fair.c
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@ -3028,9 +3028,11 @@ enqueue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
static inline void static inline void
dequeue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) dequeue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
{ {
u32 divider = get_pelt_divider(&se->avg);
sub_positive(&cfs_rq->avg.load_avg, se->avg.load_avg); sub_positive(&cfs_rq->avg.load_avg, se->avg.load_avg);
cfs_rq->avg.load_sum = cfs_rq->avg.load_avg * divider; sub_positive(&cfs_rq->avg.load_sum, se_weight(se) * se->avg.load_sum);
/* See update_cfs_rq_load_avg() */
cfs_rq->avg.load_sum = max_t(u32, cfs_rq->avg.load_sum,
cfs_rq->avg.load_avg * PELT_MIN_DIVIDER);
} }
#else #else
static inline void static inline void
@ -3513,9 +3515,10 @@ update_tg_cfs_runnable(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cf
static inline void static inline void
update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq) update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
{ {
long delta, running_sum, runnable_sum = gcfs_rq->prop_runnable_sum; long delta_avg, running_sum, runnable_sum = gcfs_rq->prop_runnable_sum;
unsigned long load_avg; unsigned long load_avg;
u64 load_sum = 0; u64 load_sum = 0;
s64 delta_sum;
u32 divider; u32 divider;
if (!runnable_sum) if (!runnable_sum)
@ -3542,7 +3545,7 @@ update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq
* assuming all tasks are equally runnable. * assuming all tasks are equally runnable.
*/ */
if (scale_load_down(gcfs_rq->load.weight)) { if (scale_load_down(gcfs_rq->load.weight)) {
load_sum = div_s64(gcfs_rq->avg.load_sum, load_sum = div_u64(gcfs_rq->avg.load_sum,
scale_load_down(gcfs_rq->load.weight)); scale_load_down(gcfs_rq->load.weight));
} }
@ -3559,19 +3562,22 @@ update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq
running_sum = se->avg.util_sum >> SCHED_CAPACITY_SHIFT; running_sum = se->avg.util_sum >> SCHED_CAPACITY_SHIFT;
runnable_sum = max(runnable_sum, running_sum); runnable_sum = max(runnable_sum, running_sum);
load_sum = (s64)se_weight(se) * runnable_sum; load_sum = se_weight(se) * runnable_sum;
load_avg = div_s64(load_sum, divider); load_avg = div_u64(load_sum, divider);
se->avg.load_sum = runnable_sum; delta_avg = load_avg - se->avg.load_avg;
if (!delta_avg)
delta = load_avg - se->avg.load_avg;
if (!delta)
return; return;
se->avg.load_avg = load_avg; delta_sum = load_sum - (s64)se_weight(se) * se->avg.load_sum;
add_positive(&cfs_rq->avg.load_avg, delta); se->avg.load_sum = runnable_sum;
cfs_rq->avg.load_sum = cfs_rq->avg.load_avg * divider; se->avg.load_avg = load_avg;
add_positive(&cfs_rq->avg.load_avg, delta_avg);
add_positive(&cfs_rq->avg.load_sum, delta_sum);
/* See update_cfs_rq_load_avg() */
cfs_rq->avg.load_sum = max_t(u32, cfs_rq->avg.load_sum,
cfs_rq->avg.load_avg * PELT_MIN_DIVIDER);
} }
static inline void add_tg_cfs_propagate(struct cfs_rq *cfs_rq, long runnable_sum) static inline void add_tg_cfs_propagate(struct cfs_rq *cfs_rq, long runnable_sum)
@ -3687,7 +3693,9 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
r = removed_load; r = removed_load;
sub_positive(&sa->load_avg, r); sub_positive(&sa->load_avg, r);
sa->load_sum = sa->load_avg * divider; sub_positive(&sa->load_sum, r * divider);
/* See sa->util_sum below */
sa->load_sum = max_t(u32, sa->load_sum, sa->load_avg * PELT_MIN_DIVIDER);
r = removed_util; r = removed_util;
sub_positive(&sa->util_avg, r); sub_positive(&sa->util_avg, r);