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sched: break out early if RT task cannot be migrated

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

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Gregory Haskins 2008-01-25 21:08:13 +01:00 committed by Ingo Molnar
parent e1f47d891c
commit 17b3279b48
1 changed files with 2 additions and 1 deletions
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kernel/sched_rt.c
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@ -176,7 +176,8 @@ static int select_task_rq_rt(struct task_struct *p, int sync)
* that is just being woken and probably will have * that is just being woken and probably will have
* cold cache anyway. * 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); int cpu = find_lowest_rq(p);
return (cpu == -1) ? task_cpu(p) : cpu; return (cpu == -1) ? task_cpu(p) : cpu;