netdev - Re: [PATCH v0 5/5] cgroup: Assign subsystem IDs during compile time

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Date:	Fri, 17 Aug 2012 15:25:19 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Daniel Wagner <wagi@...om.org>, <netdev@...r.kernel.org>,
	<cgroups@...r.kernel.org>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Gao feng <gaofeng@...fujitsu.com>,
	Glauber Costa <glommer@...allels.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH v0 5/5] cgroup: Assign subsystem IDs during compile time

On 2012/8/17 7:20, Tejun Heo wrote:
> On Thu, Aug 16, 2012 at 04:12:16PM +0200, Daniel Wagner wrote:
>> From: Daniel Wagner <daniel.wagner@...-carit.de>
>>
>> We are able to safe some space when we assign the subsystem
>> IDs at compile time. Instead of allocating per cgroup
>> cgroup->subsys[CGROUP_SUBSYS_COUNT] where CGROUP_SUBSYS_COUNT is
>> always 64, we allocate 12 + 1 at max (at this point there are 12
>> subsystem).
> 
> So, IIUC, this is effectively removing the capability to implement
> modularized controller which isn't known at kernel compile time.  Am I
> right?
> 

I think so.

> I don't think that's a bad idea but if we're doing that, can't we make
> things even simpler?  Do we need to distinguish in-kernel and module
> at all?
> 
> Li, what do you think about this?
> 

I'm definitely all for simplicity, but I'm not sure if we can do better in
simplifying the code for modularized cgroup subsystem. (I guess you didn't
mean to remove this feature?)

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