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Date: Tue, 11 Aug 2020 19:32:09 +0800 From: Jiang Biao <benbjiang@...il.com> To: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com, vincent.guittot@...aro.org Cc: dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, linux-kernel@...r.kernel.org, Jiang Biao <benbjiang@...cent.com> Subject: [PATCH v3] sched/fair: simplfy the work when reweighting entity From: Jiang Biao <benbjiang@...cent.com> The code in reweight_entity() can be simplified. For a sched entity on the rq, the entity accounting can be replaced by cfs_rq instantaneous load updates currently called from within the entity accounting. Even though an entity on the rq can't represent a task in reweight_entity() (a task is always dequeued before calling this function) and so the numa task accounting and the rq->cfs_tasks list management of the entity accounting are never called, the redundant cfs_rq->nr_running decrement/increment will be avoided. Signed-off-by: Jiang Biao <benbjiang@...cent.com> --- v3<-v2: Amend commit log taking Dietmar's advice. Thx. v2<-v1: Amend the commit log kernel/sched/fair.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 04fa8dbcfa4d..18a8fc7bd0de 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -3086,7 +3086,7 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, /* commit outstanding execution time */ if (cfs_rq->curr == se) update_curr(cfs_rq); - account_entity_dequeue(cfs_rq, se); + update_load_sub(&cfs_rq->load, se->load.weight); } dequeue_load_avg(cfs_rq, se); @@ -3102,7 +3102,7 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, enqueue_load_avg(cfs_rq, se); if (se->on_rq) - account_entity_enqueue(cfs_rq, se); + update_load_add(&cfs_rq->load, se->load.weight); } -- 2.21.0
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