linux-kernel - Re: [PATCH v4 0/4] cgroups: support for module-loadable subsystems

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Message-ID: <20100107012606.GA25577@andrew.cmu.edu>
Date:	Wed, 6 Jan 2010 20:26:06 -0500
From:	Ben Blum <bblum@...rew.cmu.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, lizf@...fujitsu.com,
	menage@...gle.com
Subject: Re: [PATCH v4 0/4] cgroups: support for module-loadable subsystems

On Wed, Jan 06, 2010 at 04:04:14PM -0800, Andrew Morton wrote:
> On Thu, 31 Dec 2009 00:10:50 -0500
> Ben Blum <bblum@...rew.cmu.edu> wrote:
> 
> > This patch series implements support for building, loading, and
> > unloading subsystems as modules, both within and outside the kernel
> > source tree. It provides an interface cgroup_load_subsys() and
> > cgroup_unload_subsys() which modular subsystems can use to register and
> > depart during runtime. The net_cls classifier subsystem serves as the
> > example for a subsystem which can be converted into a module using these
> > changes.
> 
> What is the value in this?  What are the usage scenarios?  Why does the
> benefit of this change exceed the cost/risk/etc of merging it?

As discussed in the first posting of these patches, this provides the
ability for arbitrary subsystems to be used with cgroups.. cls_cgroup
would have already been a module except for a lack of support from
cgroups, and the change also allows other module-loadable classifiers
to add subsystems of their own.
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