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authorYao Dongdong <yaodongdong@huawei.com>2014-10-28 04:08:06 +0000
committerIngo Molnar <mingo@kernel.org>2014-11-04 07:17:51 +0100
commit9f96742a13135e6c609cc99a3a458402af3c8f31 (patch)
tree3bd38a1ec1a181848230d690e9736776e932ac65 /kernel/sched
parent67dfa1b756f250972bde31d65e3f8fde6aeddc5b (diff)
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sched: Check if we got a shallowest_idle_cpu before searching for least_loaded_cpu
Idle cpu is idler than non-idle cpu, so we needn't search for least_loaded_cpu after we have found an idle cpu. Signed-off-by: Yao Dongdong <yaodongdong@huawei.com> Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1414469286-6023-1-git-send-email-yaodongdong@huawei.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/fair.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ec32c26d7fb6..d03d76de7aff 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4641,7 +4641,7 @@ 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;