linux-kernel - Re: [PATCH] cpuacct: add a branch prediction

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Message-Id: <1235647345.4948.5.camel@laptop>
Date:	Thu, 26 Feb 2009 12:22:25 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Bharata B Rao <bharata.rao@...il.com>,
	Li Zefan <lizf@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpuacct: add a branch prediction

On Thu, 2009-02-26 at 19:55 +0900, KAMEZAWA Hiroyuki wrote:
> Peter Zijlstra wrote：
> > On Thu, 2009-02-26 at 19:28 +0900, KAMEZAWA Hiroyuki wrote:
> >
> >> Taking hierarchy mutex while reading will make read-side stable.
> >
> > We're talking about scheduling here, taking a mutex to stop scheduling
> > won't work, nor will it be acceptible to use anything that will.
> >
> I'm sorry but I thought we are talking about cpuacct subsystem and not
> cpu subsystem....cpuacct subsystem's information is used for schedule ?

Not used for scheduling, but directly generated by it.


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