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

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Message-ID: <20150310124701.GB28730@htj.duckdns.org>
Date:	Tue, 10 Mar 2015 08:47:01 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Aleksa Sarai <cyphar@...har.com>
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, Aleksa.

On Tue, Mar 10, 2015 at 07:19:06PM +1100, Aleksa Sarai wrote:
> I'm not sure how to check for equality between two `css_set`s (or just two
> `css`s). Is there a function to do so? Also, I'm not sure if there's a nice way

You can compare the css pointers for equality.

> 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.

Thanks.

-- 
tejun
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