linux-kernel - Re: A Plumber’s Wish List for Linux

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Message-ID: <20111012181641.GZ15413@moon>
Date:	Wed, 12 Oct 2011 22:16:41 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org, lennart@...ttering.net,
	harald@...hat.com, david@...ar.dk, greg@...ah.com,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul Menage <paul@...lmenage.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: A Plumber’s Wish List for Linux

On Wed, Oct 12, 2011 at 10:40:14AM -0700, Tejun Heo wrote:
...
> 
> In general, I think making freezer work nicely with the rest of the
> system is a good idea and have been working towards that direction.
> Allowing a frozen task to be killed is not only handy for use cases
> like above but also makes solving freezer involved deadlocks much less
> likely and easier to solve.  Another that I have in mind is allowing
> ptrace from unfrozen task to a frozen task.  This can be helpful in
> general debugging (currently attaching to multi-threaded, violently
> cloning process is quite cumbersome) and userland checkpointing.

Yeah, being able to ptrace a frozen cgroup would be great for us.
We stick with signals start/stop cycle at moment but the final target
is the cgroups and freezer of course. (btw while were poking freezer
code I noticed that there is no shortcut to move all tasks in cgroup
into the root cgroup, so I guess say "echo -1 > tasks" might be a good
addition to move all tasks from some particular cgroup to the root
by single action).

> 
> I was working toward these and had some of the patches in Rafael's
> tree but then korg went down and we lost track of the tree and I had a
> pretty long vacation.  I can't say for sure but am aiming to achieve
> the goals during the next devel cycle.
>

This is a wishlist after all, so target is pointed and only time is
needed to implement all this ;)

	Cyrill
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