linux-kernel - Re: [RFC] [PATCH 2/2] cgroups: make procs file writable

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Message-ID: <20100531180446.GA16249@redhat.com>
Date:	Mon, 31 May 2010 20:04:46 +0200
From:	Oleg Nesterov <oleg@...hat.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,
	menage@...gle.com
Subject: Re: [RFC] [PATCH 2/2] cgroups: make procs file writable

On 05/31, Oleg Nesterov wrote:
>
> I only glanced into one function, cgroup_attach_proc(), and some things
> look "obviously wrong". Sorry, I can't really read these patches now,
> most probably I misunderstood the code...

And, forgot to mention, I do not understand the PF_EXITING check in
attach_task_by_pid() (and some others).

At first glance, it buys nothing. PF_EXITING can be set right after
the check. And, what if we have the process with the exited group-leader?
In that case we can't use tgid to move this process?

Oleg.

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