linux-kernel - [PATCH v4 1/6] sched/fair: Fix reschedule which is generated on throttled cfs

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Date:	Wed, 6 Aug 2014 12:06:01 +0400
From:	Kirill Tkhai <ktkhai@...allels.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<peterz@...radead.org>, <pjt@...gle.com>, <oleg@...hat.com>,
	<rostedt@...dmis.org>, <umgwanakikbuti@...il.com>,
	<tkhai@...dex.ru>, <tim.c.chen@...ux.intel.com>,
	<mingo@...nel.org>, <nicolas.pitre@...aro.org>
Subject: [PATCH v4 1/6] sched/fair: Fix reschedule which is generated on
 throttled cfs_rq


(sched_entity::on_rq == 1) does not guarantee the task is pickable;
changes on throttled cfs_rq must not lead to reschedule.

Check for task_struct::on_rq instead.

Signed-off-by: Kirill Tkhai <ktkhai@...allels.com>
---
 kernel/sched/fair.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index bfa3c86..6f0ce2b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7465,7 +7465,7 @@ static void task_fork_fair(struct task_struct *p)
 static void
 prio_changed_fair(struct rq *rq, struct task_struct *p, int oldprio)
 {
-	if (!p->se.on_rq)
+	if (!p->on_rq)
 		return;
 
 	/*
@@ -7521,15 +7521,15 @@ static void switched_from_fair(struct rq *rq, struct task_struct *p)
  */
 static void switched_to_fair(struct rq *rq, struct task_struct *p)
 {
-	struct sched_entity *se = &p->se;
 #ifdef CONFIG_FAIR_GROUP_SCHED
+	struct sched_entity *se = &p->se;
 	/*
 	 * Since the real-depth could have been changed (only FAIR
 	 * class maintain depth value), reset depth properly.
 	 */
 	se->depth = se->parent ? se->parent->depth + 1 : 0;
 #endif
-	if (!se->on_rq)
+	if (!p->on_rq)
 		return;
 
 	/*



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