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

[Ben Blum <bblum@andrew.cmu.edu>]

On Thu, Jan 07, 2010 at 02:42:19PM +0800, Li Zefan wrote:
> KAMEZAWA Hiroyuki wrote:
> > On Wed, 6 Jan 2010 20:26:06 -0500
> > Ben Blum <bblum@andrew.cmu.edu> wrote:
> > 
> >> 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@andrew.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.
> > 
> > Hmm, do you have your own module in plan ?
> > 
> 
> Maybe the new blkio_cgroup can also be made module-able.

certainly looks promising. one thing I note while looking over it is
that it wants .use_id = 1, and the load_subsys interface neglects to
make a call to init_idr. adding calls to cgroup_init_idr has a few
possible complications... what use does blkio have for use_id?