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

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Date:	Tue, 22 Apr 2014 11:59:23 +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 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.
 
> 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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