linux-kernel - Re: [PATCH 2/7] export memory cgroup's swappines by mem_cgroup

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Message-ID: <20110622152216.GG14343@tiehlicka.suse.cz>
Date:	Wed, 22 Jun 2011 17:22:16 +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>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"bsingharora@...il.com" <bsingharora@...il.com>,
	Ying Han <yinghan@...gle.com>,
	"hannes@...xchg.org" <hannes@...xchg.org>
Subject: Re: [PATCH 2/7] export memory cgroup's swappines by
 mem_cgroup_swappiness()

On Thu 16-06-11 12:52:22, KAMEZAWA Hiroyuki wrote:
> From 6f9c40172947fb92ab0ea6f7d73d577473879636 Mon Sep 17 00:00:00 2001
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Date: Wed, 15 Jun 2011 12:06:31 +0900
> Subject: [PATCH 2/7] export memory cgroup's swappines by mem_cgroup_swappiness()
> 
> Each memory cgroup has 'swappiness' value and it can be accessed by
> get_swappiness(memcg). The major user is try_to_free_mem_cgroup_pages()
> and swappiness is passed by argument.
> 
> It's now static function but some planned updates will need to
> get swappiness from files other than memcontrol.c
> This patch exports get_swappiness() as mem_cgroup_swappiness().
> By this, we can remove the argument of swapiness from try_to_fre...
> 
> I think this makes sense because passed swapiness is always from memory
> cgroup passed as an argument and this duplication of argument is
> not very good.

Yes makes sense and it makes it more looking like a global reclaim.

> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Reviewed-by: Michal Hocko <mhocko@...e.cz>

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