linux-kernel - Re: [PATCH v6 2/3] cgroups: allow a cgroup subsystem to reject a fork

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Message-ID: <20150326221823.GG1953@htj.duckdns.org>
Date:	Thu, 26 Mar 2015 18:18:23 -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 v6 2/3] cgroups: allow a cgroup subsystem to reject a fork

On Fri, Mar 27, 2015 at 08:41:05AM +1100, Aleksa Sarai wrote:
> > You can't pin css_set from inside cgroup callbacks.  It's a construct
> > which in general shouldn't be accessible outside cgroup core.
> 
> Yeah, sorry I meant css (you aren't pinning, but you're still saving under RCU
> and dealing with the association-related stuff inside post_fork).

How would that work without pinning?  What'd keep the css from going
away between pre and post?

Thanks.

-- 
tejun
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