linux-kernel - Re: [RFC v13][PATCH 00/14] Kernel based checkpoint/restart

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Message-Id: <1234479924.3152.13.camel@calx>
Date:	Thu, 12 Feb 2009 17:05:24 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	orenl@...columbia.edu, linux-api@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
	hpa@...or.com, Thomas Gleixner <tglx@...utronix.de>,
	Cedric Le Goater <clg@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [RFC v13][PATCH 00/14] Kernel based checkpoint/restart

On Thu, 2009-02-12 at 14:57 -0800, Dave Hansen wrote:
> > Also, what happens if I checkpoint a process in 2.6.30 and restore it in
> > 2.6.31 which has an expanded idea of what should be restored? Do your
> > file formats handle this sort of forward compatibility or am I
> > restricted to one kernel?
> 
> In general, you're restricted to one kernel.  But, people have mentioned
> that, if the formats change, we should be able to write in-userspace
> converters for the checkpoint files.  

I mentioned this because it seems like a key use case is upgrading
kernels out from under long-lived applications.

-- 
http://selenic.com : development and support for Mercurial and Linux


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