linux-kernel - Re: [RFC][PATCH 0/3] fork: Add the ability to create tasks with given pids

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Message-ID: <20111122153326.GD322@google.com>
Date:	Tue, 22 Nov 2011 07:33:26 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Pedro Alves <pedro@...esourcery.com>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...ux.intel.com>,
	Roland McGrath <roland@...k.frob.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	James Bottomley <jbottomley@...allels.com>
Subject: Re: [RFC][PATCH 0/3] fork: Add the ability to create tasks with
 given pids

Hello,

On Tue, Nov 22, 2011 at 12:04:38PM +0000, Pedro Alves wrote:
> This whole userspace C/R stuff and being able to set the child's pid has potential
> of being very useful for GDB too, allowing a much better reimplementation of its
> old checkpointing feature [*], and allowing for a faster reverse debugging
> implementation, by being able to do faster rewinding -- restore snapshot and replay
> instructions up to N (by single stepping or running to breakpoint), rather than
> manually undoing the effects of each instruction, one by one.
> 
> IOW, root only would be a shame from GDB's perspective.

Would CAP_CHECKPOINT be a shame too?  I'm reluctant about priviledge
through fd inheritance mostly because of its unusualness.  I don't
think priv management is a good problem space for small creative
solutions.  We're much better off with mundane mechanisms which people
are already familiar with and is easy to account for.

Thank you.

-- 
tejun
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