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Date:	Tue, 16 Nov 2010 12:41:51 +0900
From:	KAMEZAWA Hiroyuki <>
To:	Johannes Weiner <>
Cc:	Greg Thelen <>,
	Minchan Kim <>,
	Andrew Morton <>,
	Dave Young <>,
	Andrea Righi <>,
	Daisuke Nishimura <>,
	Balbir Singh <>,
	Wu Fengguang <>,,
Subject: Re: [patch 3/4] memcg: break out event counters from other stats

On Sun,  7 Nov 2010 23:14:38 +0100
Johannes Weiner <> 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 <>

Acked-by: KAMEZAWA Hiroyuki <>

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