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sched/fair: Avoid double search on same cpu

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The prev cpu is checked at the beginning of SIS, and it's unlikely
to be idle before the second check in select_idle_smt(). So we'd
better focus on its SMT siblings.

Signed-off-by: Abel Wu <wuyun.abel@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Josh Don <joshdon@google.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Link: https://lore.kernel.org/r/20220907112000.1854-3-wuyun.abel@bytedance.com
This commit is contained in:
Abel Wu 2022-09-07 19:19:57 +08:00 committed by Peter Zijlstra
parent 3e6efe87cd
commit b9bae70440
1 changed files with 2 additions and 0 deletions
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kernel/sched/fair.c
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@ -6355,6 +6355,8 @@ static int select_idle_smt(struct task_struct *p, int target)
int cpu;
for_each_cpu_and(cpu, cpu_smt_mask(target), p->cpus_ptr) {
if (cpu == target)
continue;
if (available_idle_cpu(cpu) || sched_idle_cpu(cpu))
return cpu;
}