linux-kernel - Re: [PATCH 1/6] cgroup: make CONFIG_NET_CLS_CGROUP and CONFIG_NETPRIO

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Date:	Sat, 18 Jan 2014 09:08:49 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<containers@...ts.linux-foundation.org>, <cgroups@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Neil Horman <nhorman@...driver.com>,
	"Thomas Graf" <tgraf@...g.ch>,
	"David S. Miller" <davem@...emloft.net>,
	"Daniel Borkmann" <dborkman@...hat.com>
Subject: Re: [PATCH 1/6] cgroup: make CONFIG_NET_CLS_CGROUP and CONFIG_NETPRIO_CGROUP
 bool instead of tristate

Cc: Daniel Borkmann <dborkman@...hat.com>

On 2014/1/18 2:11, Tejun Heo wrote:
> net_cls and net_prio are the only cgroups which are allowed to be
> built as modules.  The savings from allowing the two controllers to be
> built as modules are tiny especially given that cgroup module support
> itself adds quite a bit of complexity.
> 
> The following are the sizes of vmlinux with both built as module and
> both built as part of the kernel image with cgroup module support
> removed.
> 
> 	text		data		bss		dec
> 	20292207	2411496		10784768	33488471
> 	20293421	2412568		10784768	33490757
> 
> The total difference is 2286 bytes.  Given that none of other
> controllers has much chance of being made a module and that we're
> unlikely to add new modular controllers, the added complexity is
> simply not justifiable.
> 
> As a first step to drop cgroup module support, this patch changes the
> two config options to bool from tristate and drops module related code
> from the two controllers.
> 

I sugguested Daniel to do this for net_cls, and the change has been in
net-next.

https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=fe1217c4f3f7d7cbf8efdd8dd5fdc7204a1d65a8

I was planning to remove module support after that change goes into
upstream. :)

> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Neil Horman <nhorman@...driver.com>
> Cc: Thomas Graf <tgraf@...g.ch>
> Cc: "David S. Miller" <davem@...emloft.net>
> ---
>  net/Kconfig               |  2 +-
>  net/core/netprio_cgroup.c | 32 ++------------------------------
>  net/sched/Kconfig         |  2 +-
>  net/sched/cls_cgroup.c    | 23 ++---------------------
>  4 files changed, 6 insertions(+), 53 deletions(-)
> 

The modular version of task_netprioidx() in include/net/netprio_cgroup.h
can be removed.

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