Re: [PATCH nf-next v3] netfilter: xtables: lightweight process control group matching

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On 12/28/2013 09:17 AM, Daniel Borkmann wrote:
> On 12/28/2013 02:33 AM, Li Zefan wrote:
>> On 2013/12/27 16:05, Daniel Borkmann wrote:
>>> On 12/27/2013 04:13 AM, Li Zefan wrote:
> ...
>>>> I'd suggest splitting cls_cgroup code into 2 parts. The first part
>>>> is to manage cgroupfs and classid, and should be put into net/core/
>>>> and add a new config like NET_CGROUP_CLASSID for it. The second part
>>>> is specific cls_cgroup code.
>>>
>>> Sure, if this is wished, I'd do this as a follow-up as it doesn't affect
>>> any of this code in netfilter here.
>>
>> We should clean up the code before introducing a new feature, not the
>> other way.
> 
> Hehe, quite honestly, I think this is YOUR opinion of a "cleanup", which
> makes the code actually more complicated, and it's not strictly needed.
> 
> If you are so desperate about this separation, fine, I will do this, but
> again, I don't think it's *strictly* required for this.

Thinking about this further a bit, with this separation into net/core/, you
would need another Kconfig, where people choose between built-in or
module (or none). With built-in you would disallow people to load/unload the
cgroup part during runtime. With the module, you would introduce a module
dependency _for each_, even if you only want to use net_cls, which sort of
is not what we want from a simple "cleanup".
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