linux-kernel - [tip:sched/core] sched/deadline: Reschedule from switched_from

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Date:	Tue, 4 Nov 2014 08:11:56 -0800
From:	tip-bot for Wanpeng Li <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ktkhai@...allels.com,
	torvalds@...ux-foundation.org, mingo@...nel.org,
	peterz@...radead.org, tglx@...utronix.de, juri.lelli@....com,
	hpa@...or.com, wanpeng.li@...ux.intel.com
Subject: [tip:sched/core] sched/deadline: Reschedule from switched_from_dl
 () after a successful pull

Commit-ID:  cd66091162d34f589631a23bbe0ed214798245b4
Gitweb:     http://git.kernel.org/tip/cd66091162d34f589631a23bbe0ed214798245b4
Author:     Wanpeng Li <wanpeng.li@...ux.intel.com>
AuthorDate: Fri, 31 Oct 2014 06:39:35 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 4 Nov 2014 07:17:55 +0100

sched/deadline: Reschedule from switched_from_dl() after a successful pull

In switched_from_dl() we have to issue a resched if we successfully
pulled some task from other cpus. This patch also aligns the behavior
with -rt.

Suggested-by: Juri Lelli <juri.lelli@....com>
Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Kirill Tkhai <ktkhai@...allels.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1414708776-124078-5-git-send-email-wanpeng.li@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/deadline.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index e7779b3..362ab1f 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1643,8 +1643,11 @@ static void switched_from_dl(struct rq *rq, struct task_struct *p)
 	 * this is the right place to try to pull some other one
 	 * from an overloaded cpu, if any.
 	 */
-	if (!rq->dl.dl_nr_running)
-		pull_dl_task(rq);
+	if (!task_on_rq_queued(p) || rq->dl.dl_nr_running)
+		return;
+
+	if (pull_dl_task(rq))
+		resched_curr(rq);
 #endif
 }
 
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