From: Yao Dongdong <yaodongdong@huawei.com>
To: Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>
Cc: LKML <linux-kernel@vger.kernel.org>, <yaodongdong@huawei.com>
Subject: [PATCH] sched:skip loop non-idle cpus after find an idle cpu while find_idlest_cpu
Date: Mon, 27 Oct 2014 11:13:17 +0800 [thread overview]
Message-ID: <544DB84D.1030504@huawei.com> (raw)
Idle cpu is idler than non-idle cpu, so we needn't loop non-idle cpus after find an idle cpu.
Signed-off-by:yaodongdong@huawei.com
---
kernel/sched/fair.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0b069bf..2445a23 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4446,7 +4446,7 @@ find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
latest_idle_timestamp = rq->idle_stamp;
shallowest_idle_cpu = i;
}
- } else {
+ } else if (shallowest_idle_cpu == -1) {
load = weighted_cpuload(i);
if (load < min_load || (load == min_load && i == this_cpu)) {
min_load = load;
--
1.8.0.1
next reply other threads:[~2014-10-27 3:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-27 3:13 Yao Dongdong [this message]
2014-10-27 8:04 ` [PATCH] sched:skip loop non-idle cpus after find an idle cpu while find_idlest_cpu Srikar Dronamraju
2014-10-27 8:58 ` Yao Dongdong
2014-10-27 9:23 ` Srikar Dronamraju
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