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Date: Wed, 6 Jan 2021 14:34:17 +0100 From: Vincent Guittot <vincent.guittot@...aro.org> To: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com, dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, linux-kernel@...r.kernel.org Cc: Vincent Guittot <vincent.guittot@...aro.org> Subject: [PATCH 1/3] sched/fair: skip idle cfs_rq Don't waste time checking whether an idle cfs_rq could be the busiest queue. Furthermore, this can end up selecting a cfs_rq with a high load but being idle in case of migrate_load. Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org> --- kernel/sched/fair.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 04a3ce20da67..5428b8723e61 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -9389,8 +9389,11 @@ static struct rq *find_busiest_queue(struct lb_env *env, if (rt > env->fbq_type) continue; - capacity = capacity_of(i); nr_running = rq->cfs.h_nr_running; + if (!nr_running) + continue; + + capacity = capacity_of(i); /* * For ASYM_CPUCAPACITY domains, don't pick a CPU that could -- 2.17.1
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