linux-kernel - Re: + cgroups-forbid-noprefix-if-mounting-more-than-just-cpuset-subsystem. patch added to -mm tree

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Message-ID: <4A25C99B.40303@cn.fujitsu.com>
Date:	Wed, 03 Jun 2009 08:53:47 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
CC:	Paul Menage <menage@...gle.com>, akpm@...ux-foundation.org,
	mm-commits@...r.kernel.org, balbir@...ux.vnet.ibm.com,
	kamezawa.hiroyu@...fujitsu.com,
	lkml <linux-kernel@...r.kernel.org>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	libcg-devel <libcg-devel@...ts.sourceforge.net>
Subject: Re: +	cgroups-forbid-noprefix-if-mounting-more-than-just-cpuset-subsystem.
 patch added to -mm tree

Dhaval Giani wrote:
> On Tue, Jun 02, 2009 at 09:08:04AM -0700, Paul Menage wrote:
>> On Tue, Jun 2, 2009 at 2:09 AM, Dhaval Giani <dhaval@...ux.vnet.ibm.com> wrote:
>>> I am not sure if this is a good idea. For libcgroup, we would then be
>>> adding a special case for just cpuset. I would rather that we allow it
>>> either for all the subsystems or none of them.
>>>
>> libcgroup shouldn't be using the noprefix option. Its only intentded
>> use is to allow the legacy "cpuset" filesystem type to be mounted and
>> to see the same fileset as it had before the cgroups transition.
>>
> 
> It does not. But if some user is using that option, we need to be in a
> position to handle it.
> 
> I am quite happy not supporting the noprefix option in the library if it
> is fine.
> 

I don't think we need to support noprefix in libcgroup.

Even if we decide to support noprefix in the lib, it shouldn't be harder
to handle noprefix+cpuset only than handle noprefix+any combination of
subsystems.


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