[RFC][PATCH 5/7] sched: Remove resetting exec_start in put_prev_task_rt()

[Steven Rostedt]

From: Hillf Danton <dhillf@xxxxxxxxx>

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.

Cc: Mike Galbraith <efault@xxxxxx>
Cc: Yong Zhang <yong.zhang0@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
Link: http://lkml.kernel.org/r/BANLkTimqWD=q6YnSDi-v9y=LMWecgEzEWg@xxxxxxxxxxxxxx
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 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 7737d41..1546c1c 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
-- 
1.7.4.4


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