linux-kernel - Re: [patch 3/4] memcg: break out event counters from other stats

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Message-Id: <20101116124151.4830f685.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 16 Nov 2010 12:41:51 +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 3/4] memcg: break out event counters from other stats

On Sun,  7 Nov 2010 23:14:38 +0100
Johannes Weiner <hannes@...xchg.org> wrote:

> For increasing and decreasing per-cpu cgroup usage counters it makes
> sense to use signed types, as single per-cpu values might go negative
> during updates.  But this is not the case for only-ever-increasing
> event counters.
> 
> All the counters have been signed 64-bit so far, which was enough to
> count events even with the sign bit wasted.
> 
> The next patch narrows the usage counters type (on 32-bit CPUs, that
> is), though, so break out the event counters and make them unsigned
> words as they should have been from the start.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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

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