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

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Message-Id: <20101116124414.98167f7c.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 16 Nov 2010 12:44:14 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Greg Thelen <gthelen@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Young <hidave.darkstar@...il.com>,
	Andrea Righi <arighi@...eler.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

On Sun,  7 Nov 2010 23:14:39 +0100
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>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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