linux-kernel - [tip:sched/core] sched/rt: Add reschedule check to switched_from

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Date:	Thu, 24 Jan 2013 12:36:40 -0800
From:	tip-bot for Kirill Tkhai <tkhai@...dex.ru>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	rostedt@...dmis.org, peterz@...radead.org, tkhai@...dex.ru,
	tglx@...utronix.de
Subject: [tip:sched/core] sched/rt:
  Add reschedule check to switched_from_rt()

Commit-ID:  1158ddb55416855fd17abe3214298f736f00426a
Gitweb:     http://git.kernel.org/tip/1158ddb55416855fd17abe3214298f736f00426a
Author:     Kirill Tkhai <tkhai@...dex.ru>
AuthorDate: Fri, 23 Nov 2012 00:02:15 +0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 24 Jan 2013 17:14:30 +0100

sched/rt: Add reschedule check to switched_from_rt()

Reschedule rq->curr if the first RT task has just been
pulled to the rq.

Signed-off-by: Kirill V Tkhai <tkhai@...dex.ru>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Tkhai Kirill <tkhai@...dex.ru>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/118761353614535@web28f.yandex.ru
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/rt.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 418feb0..29bda5b 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1889,8 +1889,11 @@ static void switched_from_rt(struct rq *rq, struct task_struct *p)
 	 * we may need to handle the pulling of RT tasks
 	 * now.
 	 */
-	if (p->on_rq && !rq->rt.rt_nr_running)
-		pull_rt_task(rq);
+	if (!p->on_rq || rq->rt.rt_nr_running)
+		return;
+
+	if (pull_rt_task(rq))
+		resched_task(rq->curr);
 }
 
 void init_sched_rt_class(void)
--
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