linux-kernel - Re: Back to the future.

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Message-ID: <Pine.LNX.4.64.0704270750320.13539@sbz-30.cs.Helsinki.FI>
Date:	Fri, 27 Apr 2007 07:52:11 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	Nigel Cunningham <nigel@...el.suspend2.net>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Back to the future.

On Thu, 2007-04-26 at 09:56 -0700, Linus Torvalds wrote:
> >    which will map in the snapshot, return the mapped address and the size 
> >    (and if you want to support snapshots > 4GB, be my guest, but I suspect 
> >    you're actually *better* off just admitting that if you cannot shrink 
> >    the snapshot to less than 32 bits, it's not worth doing)
 
On Fri, 27 Apr 2007, Nigel Cunningham wrote:
> That inherently limits the image to half of available ram (you need
> somewhere to store the snapshot), so you won't get the full image you
> express interest in below.

It doesn't. We can make the userspace mapped pages copy-on-write. As long 
as the userspace makes sure there's not much activity during 
snapshot/shutdown, we will be fine. What we probably do need to copy is 
kernel pages.

			Pekka
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