linux-kernel - Re: [PATCH 0/9] OpenVZ kernel based checkpointing/restart

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Message-ID: <20080903134951.GQ14473@hawkmoon.kerlabs.com>
Date:	Wed, 3 Sep 2008 15:49:51 +0200
From:	Louis Rilling <Louis.Rilling@...labs.com>
To:	Andrey Mirkin <major@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, containers@...ts.linux-foundation.org
Subject: Re: [PATCH 0/9] OpenVZ kernel based checkpointing/restart

On Wed, Sep 03, 2008 at 02:57:47PM +0400, Andrey Mirkin wrote:
> This patchset introduces kernel based checkpointing/restart as it is
> implemented in OpenVZ project. This patchset has limited functionality and
> are able to checkpoint/restart only single process. Recently Oren Laaden
> sent another kernel based implementation of checkpoint/restart. The main
> differences between this patchset and Oren's patchset are:
> 
> * In this patchset checkpointing initiated not from the process
> (right now we do not have a container, only namespaces), Oren's patchset
> performs checkpointing from the process context.
> 
> * Restart in this patchset is initiated from process, which restarts a new
> process (in new namespaces) with saved state. Oren's patchset uses the same
> process from which restart was initiated and restore saved state over it.
> 
> * Checkpoint/restart functionality in this patchset is implemented as a kernel
> module
> 
> 
> As checkpointing is initiated not from the process which state should be saved
> we should freeze a process before saving its state. Right now Container Freezer
> from Matt Helsley can be used for this.
> 
> This patchset introduce only a concept how kernel based checkpointing/restart
> can be implemented and are able to checkpoint/restart only a single process
> with simple VMAs. 
> 
> I've tried to split my patchset in small patches to make review more easier.

Thank you Andrey for having highlighted the differences with Oren's approach,
and for having split this patchset. Few remarks in reply to the patches.

Louis

-- 
Dr Louis Rilling			Kerlabs
Skype: louis.rilling			Batiment Germanium
Phone: (+33|0) 6 80 89 08 23		80 avenue des Buttes de Coesmes
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