From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Roland McGrath <roland@redhat.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Steven Rostedt <srostedt@redhat.com>
Subject: [PATCH 3/5] sched: remove unlikely in pre_schedule_rt
Date: Wed, 25 Mar 2009 01:19:23 -0400 [thread overview]
Message-ID: <20090325052023.387662292@goodmis.org> (raw)
In-Reply-To: 20090325051920.406564281@goodmis.org
[-- Attachment #1: 0003-sched-remove-unlikely-in-pre_schedule_rt.patch --]
[-- Type: text/plain, Size: 1027 bytes --]
From: Steven Rostedt <rostedt@goodmis.org>
Impact: clean up
The annotated branch profiler shows that the unlikely used by
pre_schedule_rt is always incorrect. This makes sense because in
sched.c we have:
if (prev->sched_class->pre_schedule)
prev->sched_class->pre_schedule(rq, prev);
And we are saying that prev is unlikely to be an rt task. This looks
more like a likely candidate to me.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---
kernel/sched_rt.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index bac1061..537af77 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1260,7 +1260,7 @@ static int pull_rt_task(struct rq *this_rq)
static void pre_schedule_rt(struct rq *rq, struct task_struct *prev)
{
/* Try to pull RT tasks here if we lower this rq's prio */
- if (unlikely(rt_task(prev)) && rq->rt.highest_prio > prev->prio)
+ if (rt_task(prev) && rq->rt.highest_prio > prev->prio)
pull_rt_task(rq);
}
--
1.6.2
--
next prev parent reply other threads:[~2009-03-25 5:21 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-25 5:19 [PATCH 0/5] [PATCH][GIT PULL] remove unnecessary (un)likelys Steven Rostedt
2009-03-25 5:19 ` [PATCH 1/5] ptrace: remove incorrect unlikelys Steven Rostedt
2009-03-25 7:21 ` Ingo Molnar
2009-03-25 13:31 ` Christian Borntraeger
2009-03-25 13:42 ` Steven Rostedt
2009-03-25 9:28 ` Roland McGrath
2009-03-25 5:19 ` [PATCH 2/5] mm: remove unlikly NULL from kfree Steven Rostedt
2009-03-25 7:34 ` Pekka Enberg
2009-03-25 7:50 ` Thomas Gleixner
2009-03-25 8:01 ` Pekka Enberg
2009-03-25 21:20 ` Andrew Morton
2009-03-25 8:02 ` Hua Zhong
2009-03-25 8:06 ` Pekka Enberg
2009-03-25 13:51 ` Pekka Enberg
2009-03-25 14:47 ` Steven Rostedt
2009-03-25 14:59 ` Pekka Enberg
2009-03-25 15:04 ` Steven Rostedt
2009-03-25 15:08 ` Steven Rostedt
2009-03-25 16:14 ` Matt Mackall
2009-03-25 16:34 ` Steven Rostedt
2009-03-25 20:26 ` Jeremy Fitzhardinge
2009-03-25 21:09 ` Matt Mackall
2009-03-25 21:01 ` Matt Mackall
2009-03-25 21:24 ` Steven Rostedt
2009-03-25 15:27 ` Steven Rostedt
2009-03-26 16:10 ` Al Viro
2009-03-26 16:15 ` Andrew Morton
2009-03-25 5:19 ` Steven Rostedt [this message]
2009-03-25 5:24 ` [PATCH 3/5] sched: remove unlikely in pre_schedule_rt Steven Rostedt
2009-03-25 5:19 ` [PATCH 4/5] sched: remove unlikelys from sched_move_task Steven Rostedt
2009-03-25 5:19 ` [PATCH 5/5] mm: remove unlikelys for unlock in rmap.c Steven Rostedt
2009-04-24 11:12 ` KOSAKI Motohiro
2009-04-24 12:15 ` Lee Schermerhorn
2009-03-25 7:19 ` [PATCH 0/5] [PATCH][GIT PULL] remove unnecessary (un)likelys Ingo Molnar
2009-03-25 7:25 ` Ingo Molnar
2009-03-25 13:43 ` Steven Rostedt
2009-04-27 16:30 ` Daniel Walker
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