From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Mike Galbraith <efault@gmx.de>,
Yong Zhang <yong.zhang0@gmail.com>,
Hillf Danton <dhillf@gmail.com>
Subject: [RFC][PATCH 5/7] sched: Remove resetting exec_start in put_prev_task_rt()
Date: Thu, 16 Jun 2011 21:55:21 -0400 [thread overview]
Message-ID: <20110617015919.519061866@goodmis.org> (raw)
In-Reply-To: 20110617015516.301117218@goodmis.org
[-- Attachment #1: 0005-sched-Remove-resetting-exec_start-in-put_prev_task_r.patch --]
[-- Type: text/plain, Size: 1031 bytes --]
From: Hillf Danton <dhillf@gmail.com>
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@gmx.de>
Cc: Yong Zhang <yong.zhang0@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Hillf Danton <dhillf@gmail.com>
Link: http://lkml.kernel.org/r/BANLkTimqWD=q6YnSDi-v9y=LMWecgEzEWg@mail.gmail.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
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
next prev parent reply other threads:[~2011-06-17 1:59 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-17 1:55 [RFC][PATCH 0/7] sched: various updates to the scheduler Steven Rostedt
2011-06-17 1:55 ` [RFC][PATCH 1/7] sched: Fix need_resched() when checking peempt Steven Rostedt
2011-06-17 1:55 ` [RFC][PATCH 2/7] sched: Remove noop in next_prio() Steven Rostedt
2011-06-17 1:55 ` [RFC][PATCH 3/7] sched: Remove noop in lowest_flag_domain() Steven Rostedt
2011-06-17 1:55 ` [RFC][PATCH 4/7] sched, rt: Fix rq->rt.pushable_tasks bug in push_rt_task() Steven Rostedt
2011-06-17 2:33 ` Mike Galbraith
2011-06-17 2:41 ` Steven Rostedt
2011-06-17 1:55 ` Steven Rostedt [this message]
2011-06-17 1:55 ` [RFC][PATCH 6/7] sched: Balance RT tasks when forked as well Steven Rostedt
2011-07-26 12:25 ` Peter Zijlstra
2011-07-26 12:35 ` Steven Rostedt
2011-07-26 12:36 ` Peter Zijlstra
2011-07-26 12:50 ` Steven Rostedt
2011-08-14 16:05 ` [tip:sched/core] " tip-bot for Steven Rostedt
2011-06-17 1:55 ` [RFC][PATCH 7/7] sched: Use pushable_tasks to determine next highest prio Steven Rostedt
2011-06-17 2:40 ` [RFC][PATCH 0/7] sched: various updates to the scheduler Steven Rostedt
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