linux-kernel - Re: [PATCH 3/7] memcg: nid and zid can be calculated from zone

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Date:	Thu, 22 Jul 2010 11:06:24 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>, LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nishimura Daisuke <d-nishimura@....biglobe.ne.jp>
Subject: Re: [PATCH 3/7] memcg: nid and zid can be calculated from zone

* KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> [2010-07-21 22:33:56]:

> > > +static inline int zone_nid(struct zone *zone)
> > > +{
> > > +	return zone->zone_pgdat->node_id;
> > > +}
> > > +
> > 
> > hmm, adding a helper and not converting the existing users of
> > zone->zone_pgdat may be a little confusing particularly as both types of
> > usage would exist in the same file e.g. in mem_cgroup_zone_nr_pages.
> 
> I see. here is incrementa patch.
> 
> Thanks
> 
> From 62cf765251af257c98fc92a58215d101d200e7ef Mon Sep 17 00:00:00 2001
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Date: Tue, 20 Jul 2010 11:30:14 +0900
> Subject: [PATCH] memcg: convert to zone_nid() from bare zone->zone_pgdat->node_id
> 
> Now, we have zone_nid(). this patch convert all existing users of
> zone->zone_pgdat.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> ---
>  mm/memcontrol.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 82e191f..3d5b645 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -951,7 +951,7 @@ unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
>  				       struct zone *zone,
>  				       enum lru_list lru)
>  {
> -	int nid = zone->zone_pgdat->node_id;
> +	int nid = zone_nid(zone);
>  	int zid = zone_idx(zone);
>  	struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
>  
> @@ -961,7 +961,7 @@ unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
>  struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
>  						      struct zone *zone)
>  {
> -	int nid = zone->zone_pgdat->node_id;
> +	int nid = zone_nid(zone);
>  	int zid = zone_idx(zone);
>  	struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
>  
> @@ -1006,7 +1006,7 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
>  	LIST_HEAD(pc_list);
>  	struct list_head *src;
>  	struct page_cgroup *pc, *tmp;
> -	int nid = z->zone_pgdat->node_id;
> +	int nid = zone_nid(z);
>  	int zid = zone_idx(z);
>  	struct mem_cgroup_per_zone *mz;
>  	int lru = LRU_FILE * file + active;

Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
 
-- 
	Three Cheers,
	Balbir
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