linux-kernel - [PATCH] sched: remove resetting exec_start in put_prev_task

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Date:	Wed, 1 Jun 2011 22:03:47 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <efault@....de>,
	Yong Zhang <yong.zhang0@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] sched: remove resetting exec_start in put_prev_task_rt()

Resetting exec_start, after updated in update_curr_rt(), could open window for
messing up the subsequent computations of delta_exec of the given task.

Signed-off-by: Hillf Danton <dhillf@...il.com>
---
 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 88725c9..0f0cfce 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1166,7 +1166,6 @@ 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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