Re: [PATCH v2 1/2] cgroups: allow a cgroup subsystem to reject a fork

Aleksa Sarai
2015-03-10T14:51:06Z

Hello Tejun,

On Tue, Mar 10, 2015 at 11:47 PM, Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
>> of doing a charge that stops if you hit a certain `css` (unless we start
>> passing `css_set`s to the fork/exit callbacks -- and then we can uncharge the
>> old css_set and charge the new one).
>
> We'll have to pass the pointer from can_fork side to post_fork. I'm
> not sure how that should be done either.

Actually, I'm fairly sure we can do it all inside cgroup_post_fork() because
inside cgroup_post_fork() we have access to both the old css_set and the new
one. Then it's just a matter of reverting and re-applying the charge to the
hierarchies.

I'll send a patch in a few days, I need to make sure that this method
*actually* works. :P

--
Aleksa Sarai (cyphar)