| From: |
| Ben Blum <bblum@andrew.cmu.edu> |
| To: |
| linux-kernel@vger.kernel.org,
containers@lists.linux-foundation.org, lizf@cn.fujistu.com,
akpm@linux-foundation.org, menage@google.com, bblum@andrew.cmu.edu |
| Subject: |
| [RFC][PATCH 0/3] cgroups: support for module-loadable subsystems |
| Date: |
| Mon, 2 Nov 2009 16:28:26 -0500 |
| Message-ID: |
| <20091102212825.GA13692@andrew.cmu.edu> |
| Archive‑link: | |
Article |
This patch series implements simple support for building and loading
subsystems as modules, both within and outside the kernel source tree.
Module unloading is as yet unimplemented - it will require more advanced
reference counting in the mount/unmount code, and I plan to work on this
soon.
Patch #1 sets up the subsys[] array so its contents can be dynamic as
modules appear and (eventually) disappear. I introduce an rwsem called
subsys_mutex to protect against concurrent loads/unloads/reads, and
modify iterations over the array to handle when subsystems are absent.
Patch #2 implements an interface for modules to load subsystems, called
cgroup_load_subsys, similar to cgroup_init_subsys, and adds a module
pointer in struct cgroup_subsys.
Patch #3 modifies the net_cls subsystem, which already had some module
declarations, to be configurable as a module, which also serves as a
simple proof-of-concept.
-- bblum
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