linux-kernel - Re: Hibernation Redesign

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Message-ID: <4691BD6F.8000809@yahoo.com.au>
Date:	Mon, 09 Jul 2007 14:45:35 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Jeremy Maitin-Shepard <jbms@....edu>
CC:	Al Boldi <a1426z@...ab.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Hibernation Redesign

Jeremy Maitin-Shepard wrote:
> Nick Piggin <nickpiggin@...oo.com.au> writes:

>>This is the Morton method, isn't it? :) I remember it sounding like a
>>very good idea when he brought it up, but I can't remember the details
>>of why it was rejected or what the problems were.
> 
> 
> Perhaps he did bring it up before I did.  Please forward me a link to
> the thread or other reference if you can find it, as I'd be interested
> in reading it.

Sent in the next mail.


>>I suspect that freeing memory on the fly for the new kernel
>>would be non-trivial (but possible), however simply having a reserve
>>RAM region for the new kernel would be fine for a first step.
> 
> 
> Freeing memory on the fly should be extremely easy for the kernel (this
> is precisely what it does when it needs to satisfy an allocation).  Note
> that the memory allocated need not be contiguous.

Yes, I have a rough idea about how page reclaim works. But I just
mean it would not be trivial to load the new kernel into physically
discontiguous memory. Possible of course, but I don't think kexec or
the setup code could quite cope ATM.

-- 
SUSE Labs, Novell Inc.
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