linux-kernel - Re: [RFC][PATCH 0/3] cgroups: support for module-loadable subsystems

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Message-ID: <6599ad830911021811n7ccf7a70y6939ac581381c22f@mail.gmail.com>
Date:	Mon, 2 Nov 2009 18:11:33 -0800
From:	Paul Menage <menage@...gle.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	bblum@...rew.cmu.edu, linux-kernel@...r.kernel.org,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 0/3] cgroups: support for module-loadable subsystems

On Mon, Nov 2, 2009 at 6:03 PM, Li Zefan <lizf@...fujitsu.com> wrote:
>
> I doubt the value of module-loadable subsystems. A cgroup subsystem
> is usually a kernel resource controller, and normally it needs to
> add some hooks in some in-kernel structures and functions, which
> makes it impossible to be a module.

Not true - as the classifier example shows, if there's already a
framework that supports hooking loadable modules into some kernel
system, a resource controller can be a module.

>
> In fact, net_cls is the only subsystem that can be a module, and
> make it a module doesn't seem to have real benefit?

Wouldn't it be just as useful as any other module-loadable classifier,
of which there are quite a few?

It's true that net_cls is currently the only subsystem that makes
sense to use as a module, but its existence shows that the concept
isn't too outlandish.

Paul
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