linux-kernel - Re: [rfc v2 0/7] procfs fdinfo extension v2

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Message-ID: <20120524180121.GK798@count0.beaverton.ibm.com>
Date:	Thu, 24 May 2012 11:01:21 -0700
From:	Matt Helsley <matthltc@...ibm.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	ebiederm@...ssion.com, tj@...nel.org, skinsbursky@...nvz.org
Subject: Re: [rfc v2 0/7] procfs fdinfo extension v2

On Wed, May 23, 2012 at 02:25:41PM +0400, Cyrill Gorcunov wrote:

<snip>

>  - finally it would be great to have ability to attach tasks to
>    frozen tasks cgroup to thaw them at one moment (the preliminary
>    patch I've proposed pretty long ago, but Tejun was modifying cgroups
>    code and asked to wait until 3.4 is release, so I didn't check
>    the current status of task cgroups at moment, I've it in my todo list)

This still strikes me as the wrong way to go about freezing for c/r.
You never explained why you had to do it this way. Why can't you inject
the parasite thread, move that thread out of the cgroup-to-be-frozen,
then freeze?

As best I can tell your reply last time only fleshed out the details
of *how* you would like it to work, not *why it needs to* work that way:

	http://lkml.org/lkml/2011/11/30/27

Cheers,
	-Matt Helsley

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