linux-kernel - [tip:sched/core] sched: Fix pick_next_highest_task

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Message-ID: <tip-3d07467b7aa91623b31d7b5888a123a2c8c8e9cc@git.kernel.org>
Date:	Thu, 11 Mar 2010 14:41:51 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, dhaval.giani@...il.com,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched: Fix pick_next_highest_task_rt() for cgroups

Commit-ID:  3d07467b7aa91623b31d7b5888a123a2c8c8e9cc
Gitweb:     http://git.kernel.org/tip/3d07467b7aa91623b31d7b5888a123a2c8c8e9cc
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 10 Mar 2010 17:07:24 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 11 Mar 2010 15:21:50 +0100

sched: Fix pick_next_highest_task_rt() for cgroups

Since pick_next_highest_task_rt() already iterates all the cgroups and
is really only interested in tasks, skip over the !task entries.

Reported-by: Dhaval Giani <dhaval.giani@...il.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Tested-by: Dhaval Giani <dhaval.giani@...il.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_rt.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index bf3e38f..c4fb42a 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1146,7 +1146,12 @@ static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu)
 		if (next && next->prio < idx)
 			continue;
 		list_for_each_entry(rt_se, array->queue + idx, run_list) {
-			struct task_struct *p = rt_task_of(rt_se);
+			struct task_struct *p;
+
+			if (!rt_entity_is_task(rt_se))
+				continue;
+
+			p = rt_task_of(rt_se);
 			if (pick_rt_task(rq, p, cpu)) {
 				next = p;
 				break;
--
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