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

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Message-ID: <CAOviyai7yJrbGb+uYpK35tw7R-KM0jWQ-BmhpyTqnRFJsVYdUA@mail.gmail.com>
Date:	Wed, 11 Mar 2015 01:51:06 +1100
From:	Aleksa Sarai <cyphar@...har.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	lizefan@...wei.com, mingo@...hat.com, peterz@...radead.org,
	richard@....at,
	Frédéric Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH v2 1/2] cgroups: allow a cgroup subsystem to reject a fork

Hello Tejun,

On Tue, Mar 10, 2015 at 11:47 PM, Tejun Heo <tj@...nel.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)
www.cyphar.com
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