linux-kernel - Re: [MM] Make mm counters per cpu instead of atomic V2

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Date:	Fri, 6 Nov 2009 14:47:52 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Dave Jones <davej@...hat.com>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Tejun Heo <tj@...nel.org>
Subject: Re: [MM] Make mm counters per cpu instead of atomic V2

On Sat, 7 Nov 2009, KAMEZAWA Hiroyuki wrote:

> > If we just have one thread: Do we need atomic access at all?
> >
> Unfortunately, kswapd/vmscan touch this.

Right. And those can also occur from another processor that the process
never has run on before. Argh.

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