linux-kernel - Re: [PATCH 1/2] add mem cgroup is activated check

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Message-ID: <20090508144625.GB4630@balbir.in.ibm.com>
Date:	Fri, 8 May 2009 20:16:25 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"hugh@...itas.com" <hugh@...itas.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] add mem cgroup is activated check

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-05-08 14:07:13]:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> There is a function "mem_cgroup_disabled()" which returns
>   - memcg is configured ?
>   - disabled by boot option ?
> This is check is useful to confirm whether we have to call memcg's hook or not.
> 
> But, even when memcg is configured (and not disabled), it's not really used
> until mounted. This patch adds mem_cgroup_activated() to check memcg is
> mounted or not at least once.
> (Will be used in later patch.)
> 
> IIUC, only very careful users set boot option of memcg to be disabled and
> most of people will not be aware of that memcg is enabled at default.
> So, if memcg wants to affect to global VM behavior or to add some overheads,
> there are cases that this check is better than mem_cgroup_disabled().
>

Agreed
 
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
 
-- 
	Balbir
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