Commit 9e077b52 authored by Vincent Guittot's avatar Vincent Guittot Committed by Peter Zijlstra
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sched/pelt: Check that *_avg are null when *_sum are 



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

Signed-off-by: default avatarVincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarDietmar Eggemann <dietmar.eggemann@arm.com>
Acked-by: default avatarOdin Ugedal <odin@uged.al>
Link: https://lore.kernel.org/r/20210601155328.19487-1-vincent.guittot@linaro.org
parent 0159bb02

kernel/sched/fair.c

+9 −0
Original line number Diff line number Diff line
@@ -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;

}