linux-kernel - Re: Hibernation Redesign

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Message-Id: <E1I8Ze4-0008OM-00@dorka.pomaz.szeredi.hu>
Date:	Wed, 11 Jul 2007 12:42:08 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	rjw@...k.pl
CC:	a1426z@...ab.com, jeremy@...p.org, jbms@....edu, pavel@....cz,
	nickpiggin@...oo.com.au, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: Hibernation Redesign

> > > Yes, I suppose.  You're certain the old kernel's devices are completely
> > > quiescent at that point?
> > 
> > That's exactly the problem; trying to save a state from within the
> > kernel would probably necessitate a freezer hack, which we are
> > trying so dearly to avoid.
> 
> Well, I don't think that avoiding the freezer whatever it takes
> would be a good idea.  There needs to be some balance. ;-)

Well, it takes some extra locking in the drivers.  Which is needed
_anyway_ if we want to have a working s2ram without the freezer.

With the kexec approach, I don't see any extra requirements from the
kernel to be able to drop the freezer.

Miklos
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