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sched/pelt: Check that *_avg are null when *_sum are

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Check that we never break the rule that pelt's avg values are null if
pelt's sum are.

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>
Acked-by: Odin Ugedal <odin@uged.al>
Link: https://lore.kernel.org/r/20210601155328.19487-1-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2021-06-01 17:53:28 +02:00 committed by Peter Zijlstra
parent 0159bb020c
commit 9e077b52d8
1 changed files with 9 additions and 0 deletions
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9
kernel/sched/fair.c
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@ -8026,6 +8026,15 @@ static inline bool cfs_rq_is_decayed(struct cfs_rq *cfs_rq)
if (cfs_rq->avg.runnable_sum)
return false;
/*
* _avg must be null when _sum are null because _avg = _sum / divider
* Make sure that rounding and/or propagation of PELT values never
* break this.
*/
SCHED_WARN_ON(cfs_rq->avg.load_avg ||
cfs_rq->avg.util_avg ||
cfs_rq->avg.runnable_avg);
return true;
}