linux-kernel - [RFC] [PATCH 1/2] cgroups: modular subsystems support for use

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Message-ID: <20100108052907.GB13168@andrew.cmu.edu>
Date:	Fri, 8 Jan 2010 00:29:07 -0500
From:	Ben Blum <bblum@...rew.cmu.edu>
To:	Li Zefan <lizf@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>, menage@...gle.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, bblum@...rew.cmu.edu
Subject: [RFC] [PATCH 1/2] cgroups: modular subsystems support for use_id


On Fri, Jan 08, 2010 at 12:27:34AM -0500, Ben Blum wrote:
> 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@...rew.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@...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.
> > > 
> > > Hmm, do you have your own module in plan ?
> > > 
> > 
> > Maybe the new blkio_cgroup can also be made module-able.
> 
> Ok, the following two patches make this happen (or at least pretend to
> well enough to fool me). The first one adds use_id initialization in
> cgroup_load_subsys, and the second rearranges config options and some
> code as appropriate in block/ and adds EXPORT_SYMBOLs in cgroup.c.
> 
> -- bblum
> 
> ---
>  block/Kconfig             |    2 -
>  block/Kconfig.iosched     |    2 -
>  block/blk-cgroup.c        |   53 +++++++++++++++++++++++++++++++++++-----------
>  block/blk-cgroup.h        |   10 ++++++--
>  include/linux/iocontext.h |    2 -
>  kernel/cgroup.c           |   31 +++++++++++++++++++++-----
>  6 files changed, 77 insertions(+), 23 deletions(-)
> 
> 

View attachment "cgroups-module-use_id-support.patch" of type "text/plain" (2442 bytes)