linux-kernel - Re: Hibernation Redesign

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Message-ID: <46939E5E.6010305@goop.org>
Date:	Tue, 10 Jul 2007 07:57:34 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jeremy Maitin-Shepard <jbms@....edu>
CC:	Al Boldi <a1426z@...ab.com>, Pavel Machek <pavel@....cz>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Hibernation Redesign

Jeremy Maitin-Shepard wrote:
> I don't know a whole lot about xen, but it seems that one issue with
> this approach is that it requires you run your system under a hypervisor
> at all times, which may introduce some overhead.
>   

No, I don't think that's what Al is proposing.  The kernel-internal 
interfaces we've put in place to make Xen work could be reused to do 
some of the things you're talking about.  In particular, a kernel 
running under Xen has to be able to deal with non-contiguous physical 
pages, and reusing the same pagetable hooks would allow a kexeced kernel 
to run happily out of any random assortment of pages you manage to 
allocate for it.

    J
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