linux-kernel - [PATCH] sched: fix the calculation of __sched_period in sched

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Date:	Mon, 9 May 2016 10:45:57 +0800
From:	Zhou Chengming <zhouchengming1@...wei.com>
To:	<mingo@...hat.com>, <peterz@...radead.org>
CC:	<linux-kernel@...r.kernel.org>, <guohanjun@...wei.com>,
	<huawei.libin@...wei.com>
Subject: [PATCH] sched: fix the calculation of __sched_period in sched_slice()

When we get the sched_slice of a sched_entity, we use cfs_rq->nr_running
to calculate the whole __sched_period. But cfs_rq->nr_running is the
number of sched_entity in that cfs_rq, rq->nr_running is the number
of all the tasks that are not throttled. So we should use the
rq->nr_running to calculate the whole __sched_period value.

Signed-off-by: Zhou Chengming <zhouchengming1@...wei.com>
---
 kernel/sched/fair.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0fe30e6..59c9378 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -625,7 +625,7 @@ static u64 __sched_period(unsigned long nr_running)
  */
 static u64 sched_slice(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-	u64 slice = __sched_period(cfs_rq->nr_running + !se->on_rq);
+	u64 slice = __sched_period(rq_of(cfs_rq)->nr_running + !se->on_rq);
 
 	for_each_sched_entity(se) {
 		struct load_weight *load;
-- 
1.7.7