linux-kernel - [tip:sched/core] sched: Remove resetting exec_start in put_prev_task

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Message-ID: <tip-1812a643ccbfeb61a00a7f0d7219606e63d8815b@git.kernel.org>
Date:	Sun, 14 Aug 2011 16:03:58 GMT
From:	tip-bot for Hillf Danton <dhillf@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, dhillf@...il.com,
	rostedt@...dmis.org, tglx@...utronix.de, yong.zhang0@...il.com,
	mingo@...e.hu
Subject: [tip:sched/core] sched: Remove resetting exec_start in put_prev_task_rt()

Commit-ID:  1812a643ccbfeb61a00a7f0d7219606e63d8815b
Gitweb:     http://git.kernel.org/tip/1812a643ccbfeb61a00a7f0d7219606e63d8815b
Author:     Hillf Danton <dhillf@...il.com>
AuthorDate: Thu, 16 Jun 2011 21:55:21 -0400
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 14 Aug 2011 12:00:50 +0200

sched: Remove resetting exec_start in put_prev_task_rt()

There's no reason to clean the exec_start in put_prev_task_rt() as it is reset
when the task gets back to the run queue. This saves us doing a store() in the
fast path.

Signed-off-by: Hillf Danton <dhillf@...il.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Yong Zhang <yong.zhang0@...il.com>
Link: http://lkml.kernel.org/r/BANLkTimqWD=q6YnSDi-v9y=LMWecgEzEWg@mail.gmail.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_rt.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 8e18945..70107a3 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1178,7 +1178,6 @@ static struct task_struct *pick_next_task_rt(struct rq *rq)
 static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 {
 	update_curr_rt(rq);
-	p->se.exec_start = 0;
 
 	/*
 	 * The previous task needs to be made eligible for pushing
--
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