linux-kernel - Re: Hibernation Redesign

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Message-Id: <200707091602.27312.oliver@neukum.org>
Date:	Mon, 9 Jul 2007 16:02:26 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Jeremy Maitin-Shepard <jbms@....edu>,
	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

Am Montag, 9. Juli 2007 schrieb Pavel Machek:
> 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.

Hm, once the new kernel is booted, this decision is irrevocable, isn't it?
Is there any way to deal with errors by handing control back?

	Regards
		Oliver

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