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

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Message-ID: <6599ad830901082237l664fb403y386482a577ed185e@mail.gmail.com>
Date:	Thu, 8 Jan 2009 22:37:10 -0800
From:	Paul Menage <menage@...gle.com>
To:	Li Zefan <lizf@...fujitsu.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

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.

Paul

> I just tried it:
>
> static int parse_cgroupfs_options(char *data,
>                                     struct cgroup_sb_opts *opts)
> {
>        ...
> -       if (!opts->subsys_bits)
> -               return -EINVAL;
>        ...
> }
>
>
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