linux-kernel - Re: [RFC] [PATCH 2/2] cgroups: blkio subsystem as module

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Message-ID: <661de9471001140132o23f44a4fjb1849d865f96d19a@mail.gmail.com>
Date:	Thu, 14 Jan 2010 15:02:09 +0530
From:	Balbir Singh <bsingharora@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, Li Zefan <lizf@...fujitsu.com>,
	axboe@...nel.dk, ryov@...inux.co.jp,
	Andrew Morton <akpm@...ux-foundation.org>, menage@...gle.com,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH 2/2] cgroups: blkio subsystem as module

On Tue, Jan 12, 2010 at 5:51 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> On Fri, 8 Jan 2010 10:10:38 -0500
> Vivek Goyal <vgoyal@...hat.com> wrote:
>
>> On Fri, Jan 08, 2010 at 12:30:21AM -0500, Ben Blum wrote:
>> > Convert blk-cgroup to be buildable as a module
>> >
>> > From: Ben Blum <bblum@...rew.cmu.edu>
>> >
>> > This patch modifies the Block I/O cgroup subsystem to be able to be built as a
>> > module. As the CFQ disk scheduler optionally depends on blk-cgroup, config
>> > options in block/Kconfig, block/Kconfig.iosched, and block/blk-cgroup.h are
>> > enhanced to support the new module dependency.
>> >
>>
>> Hi Ben,
>>
>> I will give this patch a try.
>>
>> So from blk-cgroup perspective, the advantage of allowing it as module
>> will be that we can save some memory if we are not using the controller?
>>
> Is "moduled" blkio cgroup safe after page-tracking by page_cgroup is
> introduced ?
>

My guess is it won't be, unless we start exposing page_cgroup API and
then make the module depend on memcg.

Balbir
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