linux-kernel - Re: [patch 4/4] memcg: use native word page statistics counters

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Message-ID: <xr93pqufa0q2.fsf@ninji.mtv.corp.google.com>
Date:	Mon, 08 Nov 2010 14:51:01 -0800
From:	Greg Thelen <gthelen@...gle.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Young <hidave.darkstar@...il.com>,
	Andrea Righi <arighi@...eler.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Wu Fengguang <fengguang.wu@...el.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 4/4] memcg: use native word page statistics counters

Minchan Kim <minchan.kim@...il.com> writes:

> On Mon, Nov 8, 2010 at 7:14 AM, Johannes Weiner <hannes@...xchg.org> wrote:
>> The statistic counters are in units of pages, there is no reason to
>> make them 64-bit wide on 32-bit machines.
>>
>> Make them native words.  Since they are signed, this leaves 31 bit on
>> 32-bit machines, which can represent roughly 8TB assuming a page size
>> of 4k.
>>
>> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> Reviewed-by: Minchan Kim <minchan.kim@...il.com>
Reviewed-by: Greg Thelen <gthelen@...gle.com>
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