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

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Message-ID: <20120816232010.GJ24861@google.com>
Date:	Thu, 16 Aug 2012 16:20:10 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Daniel Wagner <wagi@...om.org>
Cc:	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>,
	Li Zefan <lizefan@...wei.com>,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH v0 5/5] cgroup: Assign subsystem IDs during compile time

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 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?

Thanks.

-- 
tejun
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