Messages in this thread Patch in this message | | | From | Abel Wu <> | Subject | [PATCH 4/5] sched/fair: avoid double search on same cpu | Date | Tue, 12 Jul 2022 16:20:35 +0800 |
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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> Reviewed-by: Josh Don <joshdon@google.com> --- kernel/sched/fair.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 0d7e8555bcf9..e4cf000604fc 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6344,6 +6344,8 @@ 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; } -- 2.31.1
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