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

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Date:	Sat, 7 Nov 2009 04:20:51 +0900 (JST)
From:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
To:	"Christoph Lameter" <cl@...ux-foundation.org>
Cc:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"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

Christoph Lameter wrote:
> On Sat, 7 Nov 2009, KAMEZAWA Hiroyuki wrote:
>
>> And allocate mm->usage only when the first CLONE_THREAD is specified.
>
> Ok.
>
>> if (mm->usage)
>>     access per cpu
>> else
>>     atomic_long_xxx
>
> If we just have one thread: Do we need atomic access at all?
>
Unfortunately, kswapd/vmscan touch this.

Thanks,
-Kame


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