linux-kernel - [PATCH] sched: fix how RT task is pulled

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Message-ID: <BANLkTinw9LLiGD788+6AvbE+54jyVRUwBg@mail.gmail.com>
Date:	Sun, 15 May 2011 10:50:48 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>,
	Yong Zhang <yong.zhang0@...il.com>
Subject: [PATCH] sched: fix how RT task is pulled

When pulling RT task for a given runqueue, if it is already overloaded
with RT tasks, the pull operation could be avoided at the moment.

btw, it looks like a typo?

Signed-off-by: Hillf Danton <dhillf@...il.com>
---
 kernel/sched_rt.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 19ecb31..14c764b 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1440,7 +1440,7 @@ static int pull_rt_task(struct rq *this_rq)
 	struct task_struct *p;
 	struct rq *src_rq;

-	if (likely(!rt_overloaded(this_rq)))
+	if (unlikely(rt_overloaded(this_rq)))
 		return 0;

 	for_each_cpu(cpu, this_rq->rd->rto_mask) {
--
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