linux-kernel - Re: [PATCH 1/2] memcg: fix memcg

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Message-ID: <CAA6-i6rX7-F9UO2DO3gwC2SHNuSv2Fn48eLb1BZmc3HjCkbuvQ@mail.gmail.com>
Date:	Tue, 17 Dec 2013 11:48:20 +0400
From:	Glauber Costa <glommer@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Vladimir Davydov <vdavydov@...allels.com>,
	LKML <linux-kernel@...r.kernel.org>, cgroups@...r.kernel.org,
	linux-mm@...ck.org, devel@...nvz.org,
	Glauber Costa <glommer@...nvz.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 1/2] memcg: fix memcg_size() calculation

On Mon, Dec 16, 2013 at 8:47 PM, Michal Hocko <mhocko@...e.cz> wrote:
> On Sat 14-12-13 12:15:33, Vladimir Davydov wrote:
>> The mem_cgroup structure contains nr_node_ids pointers to
>> mem_cgroup_per_node objects, not the objects themselves.
>
> Ouch! This is 2k per node which is wasted. What a shame I haven't
> noticed this back then when reviewing 45cf7ebd5a033 (memcg: reduce the
> size of struct memcg 244-fold)
>
IIRC, they weren't pointers back then. I think they were embedded in
the structure, and I let
them embedded.
My mind may be tricking me, but I think I recall that Johannes changed
them to pointers
in a later time. No ?

In any case, this is correct.
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