linux-kernel - [PATCH] RT: restore the migratable conditional

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Message-ID: <20071119163316.17268.1072.stgit@novell1.haskins.net>
Date:	Mon, 19 Nov 2007 11:34:10 -0500
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	"LKML <linux-kernel"@vger.kernel.org
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Lameter <clameter@....com>,
	Ingo Molnar <mingo@...e.hu>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: [PATCH] RT: restore the migratable conditional

(This applies to the end of Steven's "v3" series
http://lkml.org/lkml/2007/11/17/10)

----------

We don't need to bother searching if the task cannot be migrated

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 kernel/sched_rt.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 9c640c8..0026f11 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -173,7 +173,8 @@ static int select_task_rq_rt(struct task_struct *p, int sync)
 	 * that is just being woken and probably will have
 	 * cold cache anyway.
 	 */
-	if (unlikely(rt_task(rq->curr))) {
+	if (unlikely(rt_task(rq->curr)) &&
+	    (p->nr_cpus_allowed > 1)) {
 		int cpu = find_lowest_rq(p);
 
 		return (cpu == -1) ? task_cpu(p) : cpu;

-
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