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[PATCH 17/23] Subject: SCHED - restore the migratable conditional

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From: Gregory Haskins <ghaskins@...>
To: <mingo@...>
Cc: <rostedt@...>, <ghaskins@...>, <linux-rt-users@...>, <linux-kernel@...>
Subject: [PATCH 17/23] Subject: SCHED - restore the migratable conditional
Date: Tuesday, December 4, 2007 - 4:45 pm

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>
---

 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 e007d2b..fe0b43f 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -174,7 +174,8 @@ 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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Messages in current thread:
[PATCH 00/23] RT balance v7, Gregory Haskins, (Tue Dec 4, 4:44 pm)
Re: [PATCH 00/23] RT balance v7, Ingo Molnar, (Tue Dec 4, 5:27 pm)
[PATCH 0/3] RT balance v7a, Gregory Haskins, (Tue Dec 4, 10:55 pm)
[PATCH 3/3] Subject: SCHED - Use a 2-d bitmap for searching ..., Gregory Haskins, (Tue Dec 4, 10:55 pm)
Re: [PATCH 3/3] Subject: SCHED - Use a 2-d bitmap for search..., Ingo Molnar, (Wed Dec 5, 5:34 am)
Re: [PATCH 3/3] Subject: SCHED - Use a 2-d bitmap for search..., Gregory Haskins, (Wed Dec 5, 6:19 am)
Re: [PATCH 3/3] Subject: SCHED - Use a 2-d bitmap for search..., Ingo Molnar, (Wed Dec 5, 7:44 am)
Re: [PATCH 3/3] Subject: SCHED - Use a 2-d bitmap for search..., Gregory Haskins, (Wed Dec 5, 9:41 am)
[PATCH 2/3] Subject: SCHED - Only balance our RT tasks withi..., Gregory Haskins, (Tue Dec 4, 10:55 pm)
[PATCH 1/3] Subject: SCHED - Add sched-domain roots, Gregory Haskins, (Tue Dec 4, 10:55 pm)
Re: [PATCH 00/23] RT balance v7, Gregory Haskins, (Tue Dec 4, 5:35 pm)
[PATCH 23/23] Subject: SCHED - Use a 2-d bitmap for searchin..., Gregory Haskins, (Tue Dec 4, 4:46 pm)
[PATCH 22/23] Subject: SCHED - Only balance our RT tasks wit..., Gregory Haskins, (Tue Dec 4, 4:46 pm)
[PATCH 21/23] Subject: SCHED - Add sched-domain roots, Gregory Haskins, (Tue Dec 4, 4:46 pm)
[PATCH 20/23] Subject: SCHED - balance RT tasks no new wake up, Gregory Haskins, (Tue Dec 4, 4:46 pm)
[PATCH 16/23] Subject: SCHED - Avoid overload, Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 14/23] Subject: SCHED - Optimize our cpu selection ba..., Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 19/23] Subject: SCHED - Optimize out cpu_clears, Gregory Haskins, (Tue Dec 4, 4:46 pm)
[PATCH 18/23] Subject: SCHED - Optimize cpu search with hamm..., Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 15/23] Subject: SCHED - Optimize rebalancing, Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 17/23] Subject: SCHED - restore the migratable condit..., Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 13/23] Subject: SCHED - Pre-route RT tasks on wakeup, Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 10/23] Subject: SCHED - Remove some CFS specific code..., Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 12/23] Subject: SCHED - Allow current_cpu to be inclu..., Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 11/23] Subject: SCHED - Break out the search function, Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 09/23] Subject: SCHED - Consistency cleanup for this_..., Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 08/23] Subject: SCHED - Cache cpus_allowed weight for..., Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 03/23] Subject: SCHED - push RT tasks, Gregory Haskins, (Tue Dec 4, 4:44 pm)
[PATCH 06/23] Subject: SCHED - wake up balance RT, Gregory Haskins, (Tue Dec 4, 4:44 pm)
[PATCH 07/23] Subject: SCHED - disable CFS RT load balancing., Gregory Haskins, (Tue Dec 4, 4:45 pm)
[PATCH 05/23] Subject: SCHED - pull RT tasks, Gregory Haskins, (Tue Dec 4, 4:44 pm)
[PATCH 04/23] Subject: SCHED - RT overloaded runqueues accou..., Gregory Haskins, (Tue Dec 4, 4:44 pm)
[PATCH 02/23] Subject: SCHED - track highest prio queued on ..., Gregory Haskins, (Tue Dec 4, 4:44 pm)
[PATCH 01/23] Subject: SCHED - Add rt_nr_running accounting, Gregory Haskins, (Tue Dec 4, 4:44 pm)