Re: [PATCH 4/5] sock, cgroup: add sock->sk_cgroup

From: Tejun Heo
Date: Tue Nov 17 2015 - 16:31:36 EST

Hello, David.

On Tue, Nov 17, 2015 at 04:25:54PM -0500, David Miller wrote:
> > In preparation, this patch adds sock->sk_cgroup which points to the
> > associated cgroup. A sock is associated on creation and stays
> > associated to the same cgroup until freed; unfortunately, this ends up
> > adding another cgroup field to struct sock on top of sk_cgrp_prioidx
> > and sk_classid. I tried to think of a way to somehow overload the
> > existing fields but couldn't come up with a reasonable one.
> sk->sk_cgrp_prioidx is simply sk->sk_cgroup->id, is it not?

Unfortunately, sk->sk_cgrp_prioidx is an arbitrary value which can be
configured through "net_cls.classid". :(

> We really need to consolidate this before we stuff even more members
> into the socket for control group support, sorry.

Yeah, it is messy. I'll see if I can come up with a non-crazy way to
combine the other two fields with ->sk_cgroup.


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