[PATCH v4 17/20] RT: restore the migratable conditional
- From: Steven Rostedt <rostedt@xxxxxxxxxxx>
- Date: Tue, 20 Nov 2007 20:01:11 -0500
From: Gregory Haskins <ghaskins@xxxxxxxxxx>
We don't need to bother searching if the task cannot be migrated
Signed-off-by: Gregory Haskins <ghaskins@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <srostedt@xxxxxxxxxx>
---
kernel/sched_rt.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
Index: linux-compile.git/kernel/sched_rt.c
===================================================================
--- linux-compile.git.orig/kernel/sched_rt.c 2007-11-20 19:53:11.000000000 -0500
+++ linux-compile.git/kernel/sched_rt.c 2007-11-20 19:53:13.000000000 -0500
@@ -173,7 +173,8 @@ static int select_task_rq_rt(struct task
* 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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- References:
- [PATCH v4 00/20] New RT Balancing version 4
- From: Steven Rostedt
- [PATCH v4 00/20] New RT Balancing version 4
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