Messages in this thread Patch in this message | | | From | Jiang Biao <> | Subject | [PATCH] sched/fair: reduce preemption with IDLE tasks runable | Date | Sat, 1 Aug 2020 10:32:48 +0800 |
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From: Jiang Biao <benbjiang@tencent.com>
No need to preempt when there are only one runable CFS task with other IDLE tasks on runqueue. The only one CFS task would always be picked in that case.
Signed-off-by: Jiang Biao <benbjiang@tencent.com> --- kernel/sched/fair.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 04fa8dbcfa4d..8fb80636b010 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4527,7 +4527,7 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued) return; #endif - if (cfs_rq->nr_running > 1) + if (cfs_rq->nr_running > cfs_rq.idle_h_nr_running + 1) check_preempt_tick(cfs_rq, curr); } -- 2.21.0
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