linux-kernel - Re: [PATCH v5 2/3] cgroups: add can_attach callback for checking all threads in a group

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Message-ID: <AANLkTind=V+V8vz1PGWiB8bCGVmfPJgC1q_XRmi5t_Eq@mail.gmail.com>
Date:	Mon, 23 Aug 2010 16:31:47 -0700
From:	Paul Menage <menage@...gle.com>
To:	Ben Blum <bblum@...rew.cmu.edu>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, akpm@...ux-foundation.org,
	ebiederm@...ssion.com, lizf@...fujitsu.com, matthltc@...ibm.com,
	oleg@...hat.com
Subject: Re: [PATCH v5 2/3] cgroups: add can_attach callback for checking all
 threads in a group

On Tue, Aug 10, 2010 at 10:48 PM, Ben Blum <bblum@...rew.cmu.edu> wrote:
>
> Add cgroup wrapper for safely calling can_attach on all threads in a threadgroup
>
> From: Ben Blum <bblum@...rew.cmu.edu>
>
> This patch adds a function cgroup_can_attach_per_thread which handles iterating
> over each thread in a threadgroup safely with respect to the invariants that
> will be used in cgroup_attach_proc. Also, subsystems whose can_attach calls
> require per-thread validation are modified to use the per_thread wrapper to
> avoid duplicating cgroup-internal code.
>
> This is a pre-patch for cgroup-procs-writable.patch.
>
> Signed-off-by: Ben Blum <bblum@...rew.cmu.edu>

Acked-by: Paul Menage <menage@...gle.com>

Some of the can_attach() methods could be simplified slightly by
directly returning the result of cgroup_can_attach_per_thread()

Paul
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