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| author |   Abel Wu <wuyun.abel@bytedance.com> | 2022-09-07 19:19:57 +0800 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-09-07 21:53:46 +0200 |
| commit | b9bae70440d21e106fbc098803b5a190df65f2e0 (patch) | |
| tree | c2b6a828a631d00a7adb80b24b19256396cc44b5 /kernel/sched/fair.c | |
| parent | sched/fair: Remove redundant check in select_idle_smt() (diff) | |
| download | linux-dev-b9bae70440d21e106fbc098803b5a190df65f2e0.tar.xz linux-dev-b9bae70440d21e106fbc098803b5a190df65f2e0.zip | |
sched/fair: Avoid double search on same cpu
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
Diffstat (limited to '')
| -rw-r--r-- | kernel/sched/fair.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 9657c7de5f57..1ad79aaaaf93 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -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; } |