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Date:	Sun, 3 Jul 2011 19:46:16 +0200
From:	Pavel Machek <pavel@....cz>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>,
	Len Brown <lenb@...nel.org>
Subject: Re: [patch 1/1] [PATCH] include storage keys in hibernation image.

Hi!

> > I think, however, that we really should try to merge them.  The only
> > difference seems to be how the additionally allocated pages will be populated
> > and what's going to happen to their contents during restore.
> > 
> > ACPI will simply copy the NVS memory to those pages, while S390 will save
> > the relevant storage key bits in there.
> 
> One complication to keep in mind is that we need to know which storage key
> goes to which page frame. We need something like the orig_bm/copy_bm or
> we'd have to store the pfn with the key. Simply storing the key for every
> page will make the array unnecessarily big.

How big is the overhead? In percent / in megabytes?
									Pavel
-- 
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