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

From: Paul Menage
Date: Mon Nov 02 2009 - 21:11:47 EST

On Mon, Nov 2, 2009 at 6:03 PM, Li Zefan <lizf@xxxxxxxxxxxxxx> 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.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at