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

[Balbir Singh <balbir@linux.vnet.ibm.com>]

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

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.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@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
 
-- 
	Balbir

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