linux-kernel - Re: [RFC][PATCH] NOOP cgroup subsystem

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Message-ID: <4966F230.4020905@cn.fujitsu.com>
Date:	Fri, 09 Jan 2009 14:44:00 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
CC:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH] NOOP cgroup subsystem

Paul Menage wrote:
> On Thu, Jan 8, 2009 at 10:29 PM, Li Zefan <lizf@...fujitsu.com> wrote:
>> Agreed, but it can't work by just removing the checking in cgroup mount option,
> 
> Right - it's more complicated than that. There are some places in the
> code that rely on the fact that every hierarchy currently has at least
> one subsystem (anything that uses find_first_subsystem() for example)
> and we'd need to work around that.
> 

And some other problems, like what's the semantic of /proc/<pid>/cgroup when
using none subsys.

I'm afraid even if it's do-able it might require a lot of changes in cgroup.


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