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sched/eevdf: Ensure that vprot will never go above a min slice

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ineligible_vruntime() can be after the duration of a min slice but we
want to make sure that current will not run more than a min slice.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260921152238.3804392-2-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2026-09-21 17:22:31 +02:00 committed by Peter Zijlstra
parent c9ce69fc43
commit aae2a33ea6
1 changed files with 1 additions and 2 deletions
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3
kernel/sched/fair.c
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@ -1128,10 +1128,9 @@ static inline void set_protect_slice(struct cfs_rq *cfs_rq, struct sched_entity
/* If there are shorter slices than se's one */
if (slice != se->slice) {
vprot = min_vruntime(vprot, se->vruntime + calc_delta_fair(slice, se));
if (sched_feat(PREEMPT_SHORT))
vprot = min_vruntime(vprot, ineligible_vruntime(cfs_rq));
else
vprot = min_vruntime(vprot, se->vruntime + calc_delta_fair(slice, se));
}
se->vprot = vprot;