linux-kernel - Re: [PATCH 2/4] cgroup:add css_is

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Message-ID: <49752E11.20209@cn.fujitsu.com>
Date:	Tue, 20 Jan 2009 09:51:13 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
CC:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/4] cgroup:add css_is_populated

Paul Menage wrote:
> On Thu, Jan 15, 2009 at 7:00 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
>> Li-san, If you don't like this, could you give me an idea for
>> "How to check cgroup is fully ready or not" ?
>>
>> BTW, why "we have a half filled direcotory - oh well" is allowed....
> 
> That's pretty much inherited from the original cpusets code. It
> probably should be cleaned up, but unless the system is totally hosed
> it seems pretty unlikely for creation of a few dentries to fail.
> 

Yes, but I can see a potential problem. If we have subsystem foo and bar,
and both of them have a control file with exactly the same name, like
foo.stat & bar.stat. Now we mount them with -o noprefix, and then one
of the stat file will fail to be created, without any warnning or notification
to the user.

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