linux-kernel - Re: [PATCH v4] sched: fix wrong rq's runnable

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Message-ID: <1365513368.25498.47.camel@gandalf.local.home>
Date:	Tue, 09 Apr 2013 09:16:08 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Ingo Molnar <mingo@...nel.org>, Paul Turner <pjt@...gle.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH v4] sched: fix wrong rq's runnable_avg update with rt
 tasks

On Tue, 2013-04-09 at 14:18 +0200, Vincent Guittot wrote:
> On 9 April 2013 10:55, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Thu, 2013-04-04 at 16:15 +0200, Vincent Guittot wrote:
> >> Changes since V2:
> >> - remove useless definition for UP platform
> >> - rebased on top of Steven Rostedt's patches :
> >> https://lkml.org/lkml/2013/2/12/558
> >
> > So what's the status of those patches? I still worry about the extra
> > context switch overhead for the high-frequency idle scenario.
> 
> I don't know. I have seen a pulled answer from Ingo but can't find the
> commits in the tip tree.
> 
> Steve, have you got more info about the status of your patches ?
> 

Yeah, I asked Ingo to revert it due to Peter's concerns. I was able to
get the latencies I needed without that patch set. That made it not so
urgent.

Can you rebase your patches doing something similar? That is, still use
the pre/post_schedule_idle() calls, but don't base it off of my patch
set.

Thanks,

-- Steve


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