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

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Message-ID: <20140428150426.GB24807@dhcp22.suse.cz>
Date:	Mon, 28 Apr 2014 17:04:26 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Jianyu Zhan <nasa4836@...il.com>
Cc:	hannes@...xchg.org, bsingharora@...il.com,
	kamezawa.hiroyu@...fujitsu.com, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm/memcontrol.c: introduce helper
 mem_cgroup_zoneinfo_zone()

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?

> > Signed-off-by: Jianyu Zhan <nasa4836@...il.com>
> > ---
> >  mm/memcontrol.c | 15 +++++++++++----
> >  1 file changed, 11 insertions(+), 4 deletions(-)
> > 
> > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > index e0ce15c..80d9e38 100644
> > --- a/mm/memcontrol.c
> > +++ b/mm/memcontrol.c
> > @@ -683,6 +683,15 @@ mem_cgroup_zoneinfo(struct mem_cgroup *memcg, int nid, int zid)
> >  	return &memcg->nodeinfo[nid]->zoneinfo[zid];
> >  }
> >  
> > +static struct mem_cgroup_per_zone *
> > +mem_cgroup_zoneinfo_zone(struct mem_cgroup *memcg, struct zone *zone)
> > +{
> > +       int nid = zone_to_nid(zone);
> > +       int zid = zone_idx(zone);
> > +
> > +       return mem_cgroup_zoneinfo(memcg, nid, zid);
> > +}
> > +
> >  struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg)
> >  {
> >  	return &memcg->css;
> > @@ -1232,11 +1241,9 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
> >  
> >  	rcu_read_lock();
> >  	if (reclaim) {
> > -		int nid = zone_to_nid(reclaim->zone);
> > -		int zid = zone_idx(reclaim->zone);
> >  		struct mem_cgroup_per_zone *mz;
> >  
> > -		mz = mem_cgroup_zoneinfo(root, nid, zid);
> > +		mz = mem_cgroup_zoneinfo_zone(root, reclaim->zone);
> >  		iter = &mz->reclaim_iter[reclaim->priority];
> >  		if (prev && reclaim->generation != iter->generation) {
> >  			iter->last_visited = NULL;
> > @@ -1340,7 +1347,7 @@ struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
> >  		goto out;
> >  	}
> >  
> > -	mz = mem_cgroup_zoneinfo(memcg, zone_to_nid(zone), zone_idx(zone));
> > +	mz = mem_cgroup_zoneinfo_zone(memcg, zone);
> >  	lruvec = &mz->lruvec;
> >  out:
> >  	/*
> > -- 
> > 1.9.0.GIT
> > 
> 
> -- 
> Michal Hocko
> SUSE Labs
> --
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-- 
Michal Hocko
SUSE Labs
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