linux-kernel - Re: [RFC][PATCH 01/10] sched: Change rt_task(prev) in pre_schedule

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Date:	Mon, 06 Dec 2010 22:32:49 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [RFC][PATCH 01/10] sched: Change rt_task(prev) in
 pre_schedule_rt to likely

On Tue, 2010-12-07 at 11:25 +0800, Yong Zhang wrote:
> On Tue, Dec 7, 2010 at 9:58 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
> > From: Steven Rostedt <srostedt@...hat.com>
> >
> > As found with the branch annotation profiler, the unlikely(rt_task(prev))
> > in pre_schedule_rt() is always wrong. In fact it should be likely due to
> > the fact that we got to this function because we used prev's scheduling
> > class (which had to be rt).
> >
> > Change the unlikely(rt_task(prev)) to likely(rt_task(prev))
> 
> I have sent a more radical patch before but it get ignored.
> http://marc.info/?l=linux-kernel&m=126572702600950&w=2

I like yours better. I'll add that one to my queue instead.

Thanks,

-- Steve



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