sched: break out early if RT task cannot be migrated
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>
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 9becc37..72c8132 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -176,7 +176,8 @@
* 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;
