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

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Date:	Fri, 2 May 2014 15:05:16 -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 Thu, 1 May 2014 08:54:50 -0400 Johannes Weiner <hannes@...xchg.org> wrote:

> On Mon, Apr 28, 2014 at 05:04:26PM +0200, Michal Hocko wrote:
> > On Tue 22-04-14 11:59:23, Michal Hocko wrote:
> > > On Sat 19-04-14 07:01:43, Jianyu Zhan wrote:
> > > > introduce helper mem_cgroup_zoneinfo_zone(). This will make
> > > > mem_cgroup_iter() code more compact.
> > > 
> > > I dunno. Helpers are usually nice but this one adds more code then it
> > > removes. It also doesn't help the generated code.
> > > 
> > > So I don't see any reason to merge it.
> > 
> > So should we drop it from mmotm?
> 
> Yes, please.
> 
> > > > Signed-off-by: Jianyu Zhan <nasa4836@...il.com>
> > > > ---
> > > >  mm/memcontrol.c | 15 +++++++++++----
> > > >  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> This helper adds no value, but more code and indirection.
> 
> Cc'd Andrew - this is about
> mm-memcontrolc-introduce-helper-mem_cgroup_zoneinfo_zone.patch
> mm-memcontrolc-introduce-helper-mem_cgroup_zoneinfo_zone-checkpatch-fixes.patch

The patch seemed rather nice to me.  mem_cgroup_zoneinfo_zone()
encapsulates a particular concept and gives it a name.  That's better
than splattering the logic into callsites.

The patch makes no change to code size but that's because gcc is silly.
Mark mem_cgroup_zoneinfo_zone() as noinline and the patch shrinks
.text by 40 bytes.

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