Re: [PATCH 2/2] mm/memcontrol.c: introduce helper mem_cgroup_zoneinfo_zone()

[Andrew Morton <akpm@linux-foundation.org>]

On Fri, 2 May 2014 19:29:08 -0400 Johannes Weiner <hannes@cmpxchg.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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