linux-kernel - [tip:sched/core] sched/deadline: Skip in switched_to

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Message-ID: <tip-390f3258cb2d031f1c17aa32e771ebd336e89073@git.kernel.org>
Date:	Mon, 10 Feb 2014 05:29:51 -0800
From:	tip-bot for Kirill Tkhai <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, ktkhai@...allels.com, hpa@...or.com,
	mingo@...nel.org, peterz@...radead.org, tglx@...utronix.de,
	juri.lelli@...il.com
Subject: [tip:sched/core] sched/deadline: Skip in switched_to_dl()
  if task is current

Commit-ID:  390f3258cb2d031f1c17aa32e771ebd336e89073
Gitweb:     http://git.kernel.org/tip/390f3258cb2d031f1c17aa32e771ebd336e89073
Author:     Kirill Tkhai <ktkhai@...allels.com>
AuthorDate: Tue, 28 Jan 2014 11:26:14 +0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 9 Feb 2014 13:31:48 +0100

sched/deadline: Skip in switched_to_dl() if task is current

When p is current and it's not of dl class, then there are no other
dl taks in the rq. If we had had pushable tasks in some other rq,
they would have been pushed earlier. So, skip "p == rq->curr" case.

Signed-off-by: Kirill Tkhai <ktkhai@...allels.com>
Acked-by: Juri Lelli <juri.lelli@...il.com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20140128072421.32315.25300.stgit@tkhai
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/deadline.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 0dd5e09..b5700bc 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1560,7 +1560,7 @@ static void switched_to_dl(struct rq *rq, struct task_struct *p)
 	if (unlikely(p->dl.dl_throttled))
 		return;
 
-	if (p->on_rq || rq->curr != p) {
+	if (p->on_rq && rq->curr != p) {
 #ifdef CONFIG_SMP
 		if (rq->dl.overloaded && push_dl_task(rq) && rq != task_rq(p))
 			/* Only reschedule if pushing failed */
--
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