linux-kernel - Re: [PATCH v2 1/2] memcg: break out event counters from other stats

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Message-ID: <20110217063106.GI3415@balbir.in.ibm.com>
Date:	Thu, 17 Feb 2011 12:01:06 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] memcg: break out event counters from other stats

* Greg Thelen <gthelen@...gle.com> [2011-02-16 21:34:01]:

> From: Johannes Weiner <hannes@...xchg.org>
> 
> 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>
> Signed-off-by: Greg Thelen <gthelen@...gle.com>
> ---

Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
 
-- 
	Three Cheers,
	Balbir
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