linux-kernel - Re: [PATCH]: In kernel hibernation, suspend to both

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Message-ID: <1336951080.2190.4.camel@shrek.rexursive.com>
Date:	Mon, 14 May 2012 09:18:00 +1000
From:	Bojan Smojver <bojan@...ursive.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	linux-kernel@...r.kernel.org, bp@...en8.de
Subject: Re: [PATCH]: In kernel hibernation, suspend to both

On Sun, 2012-05-13 at 15:10 +0200, Rafael J. Wysocki wrote:
> > So, a suspend after the image write will be just one long "failure",
> after
> > which hibernation code has to unwind again. No?
> 
> Hmm.  Good question.  It should be like this I think, although there
> may be some corner cases lurking.

AFAICT, the user space suspend to both works this way.

If I understand thing correctly, at the point of suspend to memory, we
are not really running a full system any more. All the processes have
been frozen and they've been told that hibernation is in progress. Ditto
devices, minus the ones we use to write to swap. So, when hibernation
code unwinds post resume from memory, it would be doing the correct
thing.

Srivatsa, does that make sense to you?

-- 
Bojan

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