linux-kernel - Re: [PATCH 10/30] cr: core stuff

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Date:	Tue, 14 Apr 2009 09:39:50 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Oren Laadan <orenl@...columbia.edu>, xemul@...allels.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	mingo@...e.hu
Subject: Re: [PATCH 10/30] cr: core stuff

On Tue, 2009-04-14 at 20:00 +0400, Alexey Dobriyan wrote:
> > Are you suggesting that conversion of a checkpoint image from an older
> > version to a newer version be done in the kernel ?
> 
> For mainline kernel it's completely unrealistic to support all backwards
> compatibility code for previous versions. Some mythical userspace
> program will convert images.
> 
> But it's completely realistic and much easier for distro kernel because
> distro kernel doesn't generally include patches with significant in-kernel
> internals changes, so they simply can support
> '2.6.26-1-amd64' => '2.6.26-2-amd64' situation.
> 
> Distros can write conversion program too, but I don't expect they will.

Yeah, I'm with you on this.  If distros ever start to care about c/r
*that* much, they'll start making this part of their testing process.
Personally, I think just giving a kernel version is pretty worthless
these days.  People do tons of stuff to the kernel without bumping it at
all. 

-- Dave

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