linux-kernel - Re: [PATCH v5 3/6] memg: vmscan pass nodemask

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Message-ID: <20110810111958.GB15007@tiehlicka.suse.cz>
Date:	Wed, 10 Aug 2011 13:19:58 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH v5 3/6]  memg: vmscan pass nodemask

On Tue 09-08-11 19:10:18, KAMEZAWA Hiroyuki wrote:
> 
> pass memcg's nodemask to try_to_free_pages().
> 
> try_to_free_pages can take nodemask as its argument but memcg
> doesn't pass it. Considering memcg can be used with cpuset on
> big NUMA, memcg should pass nodemask if available.
> 
> Now, memcg maintain nodemask with periodic updates. pass it.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Changelog:
>  - fixed bugs to pass nodemask.

Yes, looks good now.
Reviewed-by: Michal Hocko <mhocko@...e.cz>

> Index: mmotm-Aug3/mm/vmscan.c
> ===================================================================
> --- mmotm-Aug3.orig/mm/vmscan.c
> +++ mmotm-Aug3/mm/vmscan.c
> @@ -2354,7 +2354,7 @@ unsigned long try_to_free_mem_cgroup_pag
>  		.order = 0,
>  		.mem_cgroup = mem_cont,
>  		.memcg_record = rec,
> -		.nodemask = NULL, /* we don't care the placement */
> +		.nodemask = NULL,
>  		.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
>  				(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK),
>  	};

We can remove the whole nodemask initialization.

> @@ -2368,7 +2368,7 @@ unsigned long try_to_free_mem_cgroup_pag
>  	 * take care of from where we get pages. So the node where we start the
>  	 * scan does not need to be the current node.
>  	 */
> -	nid = mem_cgroup_select_victim_node(mem_cont);
> +	nid = mem_cgroup_select_victim_node(mem_cont, &sc.nodemask);
>  
>  	zonelist = NODE_DATA(nid)->node_zonelists;

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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