linux-kernel - Re: [RFC][PATCH] remove rq->lock from cpuacct cgroup (Was Re: [PATCH] cpuacct: add a branch prediction

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Message-Id: <1236066689.18955.27.camel@twins>
Date:	Tue, 03 Mar 2009 08:51:29 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	paulmck@...ux.vnet.ibm.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: [RFC][PATCH] remove rq->lock from cpuacct cgroup (Was Re:
 [PATCH] cpuacct: add a branch prediction

On Tue, 2009-03-03 at 08:42 +0900, KAMEZAWA Hiroyuki wrote:

> > Furthermore, if you want something like schedule_work_on() for each cpu,
> > there's schedule_on_each_cpu().
> > 
> It can't pass arguments...Maybe I should use rq->lock here to reset
> other cpu's value.

Why bother with serializing the reset code at all?

But there's always smp_call_function() I suppose.

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