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

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Message-ID: <934198669efa83e838a52284e2c4f8b5.squirrel@webmail-b.css.fujitsu.com>
Date:	Thu, 26 Feb 2009 20:17:56 +0900 (JST)
From:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"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

Peter Zijlstra さんは書きました：
> 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.
>
No mutex is necessary, anyway.
hierarchy-walker function completely works well under rcu read lock,
if small jitter is allowed.

Thanks,
-Kame

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