diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 7911a402c931..c8a98e0d82d5 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5474,9 +5474,9 @@ static struct sched_entity * pick_next_entity(struct cfs_rq *cfs_rq) { /* - * Enabling NEXT_BUDDY will affect latency but not fairness. + * Picking the ->next buddy will affect latency but not fairness. */ - if (sched_feat(NEXT_BUDDY) && + if (sched_feat(PICK_BUDDY) && cfs_rq->next && entity_eligible(cfs_rq, cfs_rq->next)) return cfs_rq->next; diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 143f55df890b..f2a13a01dd7b 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -15,6 +15,15 @@ SCHED_FEAT(RUN_TO_PARITY, true) */ SCHED_FEAT(NEXT_BUDDY, false) +/* + * Allow completely ignoring cfs_rq->next; which can be set from various + * places: + * - NEXT_BUDDY (wakeup preemption) + * - yield_to_task() + * - cgroup dequeue / pick + */ +SCHED_FEAT(PICK_BUDDY, true) + /* * Consider buddies to be cache hot, decreases the likeliness of a * cache buddy being migrated away, increases cache locality.