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sched/fair: Skip idle cfs_rq

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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@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Link: https://lkml.kernel.org/r/20210107103325.30851-2-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2021-01-07 11:33:23 +01:00 committed by Peter Zijlstra
parent 8c1f560c1e
commit fc488ffd42
1 changed files with 4 additions and 1 deletions
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5
kernel/sched/fair.c
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@ -9402,8 +9402,11 @@ 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