linux-kernel - Re: [PATCH 2/2] mm/memcontrol.c: introduce helper mem_cgroup_zoneinfo

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Date:	Mon, 5 May 2014 14:36:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Michal Hocko <mhocko@...e.cz>, Jianyu Zhan <nasa4836@...il.com>,
	bsingharora@...il.com, kamezawa.hiroyu@...fujitsu.com,
	cgroups@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.com
Subject: Re: [PATCH 2/2] mm/memcontrol.c: introduce helper
 mem_cgroup_zoneinfo_zone()

On Fri, 2 May 2014 19:29:08 -0400 Johannes Weiner <hannes@...xchg.org> wrote:

> Memcg zoneinfo lookup sites have either the page, the zone, or the
> node id and zone index, but sites that only have the zone have to look
> up the node id and zone index themselves, whereas sites that already
> have those two integers use a function for a simple pointer chase.
> 
> Provide mem_cgroup_zone_zoneinfo() that takes a zone pointer and let
> sites that already have node id and zone index - all for each node,
> for each zone iterators - use &memcg->nodeinfo[nid]->zoneinfo[zid].
> 
> Rename page_cgroup_zoneinfo() to mem_cgroup_page_zoneinfo() to match.

Patch shrinks my mm/memcontrol.o nicely:

   text    data     bss     dec     hex filename
  55702   15681   24560   95943   176c7 mm/memcontrol.o-before
  55489   15681   24464   95634   17592 mm/memcontrol.o-after

The bss size changes are weird - the patch doesn't touch bss afaict. 
This often happens.  One day I'll get in there and work out why.

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