linux-kernel - [PATCH] sched: let __sched_period() use rq cfs's nr

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Date:	Tue,  7 Jul 2015 13:40:30 +0900
From:	byungchul.park@....com
To:	mingo@...nel.org, peterz@...radead.org
Cc:	linux-kernel@...r.kernel.org,
	Byungchul Park <byungchul.park@....com>
Subject: [PATCH] sched: let __sched_period() use rq cfs's nr_running

From: Byungchul Park <byungchul.park@....com>

__sched_period() returns a period which a rq can have. the period has to be
stretched by the number of task *the rq has*, when nr_running > nr_latency.
otherwise, task slice can be very smaller than sysctl_sched_min_granularity
depending on the position of tg hierarchy when CONFIG_FAIR_GROUP_SCHED.

Signed-off-by: Byungchul Park <byungchul.park@....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 09456fc..1adacb8 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -635,7 +635,7 @@ 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)->cfs.nr_running + !se->on_rq);
 
 	for_each_sched_entity(se) {
 		struct load_weight *load;
-- 
1.7.9.5

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