linux-kernel - Re: Hibernation Redesign

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Message-ID: <20070709134522.GA3216@elf.ucw.cz>
Date:	Mon, 9 Jul 2007 15:45:22 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jeremy Maitin-Shepard <jbms@....edu>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>, Al Boldi <a1426z@...ab.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Hibernation Redesign

Hi!

> >> This approach eliminates the need for the freezer, as it would make
> >> hibernate look a lot a bit like suspend to ram from the perspective of
> >> the "old" kernel (the kernel being hibernated), as the hibernate
> >> operation itself would be completely atomic from the perspective of the
> >> "old" kernel.  That is not to say, of course, that any code paths would
> >> actually be shared, or that the drivers would do the same things
> >> (because they probably would not).
> 
> > Well it basically is suspend to RAM with the additional step that a
> > new kernel gets booted and writes out the data from RAM to disk then
> > shuts down.
> 
> There is the key difference, though, that the drivers should do rather
> different things.  In particular, rather than place the hardware in a
> low-power mode, it should place it in some state such that the new
> kernel being loaded can handle it.

Actually, when current kernel restores the snapshot... driver
requirements seem to be pretty similar. So that should not be a big
problem.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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