linux-kernel - Re: [RFC PATCH 1/4] cgroups: Allow a cgroup subsys to reject a fork

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Message-ID: <BANLkTikVLnMqtaTqjw94qughBvWPcu4yog@mail.gmail.com>
Date:	Tue, 21 Jun 2011 10:39:04 -0700
From:	Paul Menage <menage@...gle.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH 1/4] cgroups: Allow a cgroup subsys to reject a fork

On Sun, Jun 19, 2011 at 4:51 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> Make the cgroup subsystem fork callback return a value
> so that subsystems are able to accept or reject a fork
> completion with a custom error value.

This is unnecessary complexity in the cgroup subsystem (and seems to
miss cleanup for subsystems that have previously had their fork()
method return success).

If you want a subsystem to be able to reject a fork, I think it's
better to have that subsystem be called explicitly from do_fork(), and
keep that logic out of cgroups.

Paul
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