linux-kernel - Re: [RFC][PATCH -mm 1/3] PM: Hibernation and suspend notifiers

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Date:	Mon, 28 May 2007 15:12:43 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>
Subject: Re: [RFC][PATCH -mm 1/3] PM: Hibernation and suspend notifiers

Hi!

> Make it possible to register hibernation and suspend notifiers, so that
> subsystems can perform hibernation-related or suspend-related operations that
> should not be carried out by device drivers' .suspend() and
> .resume() routines.

I believe it adds _way_ too many notifiers.

> +PM_PRE_FREEZE		The system is going to hibernate or suspend, tasks will
> +			be frozen immediately

80 columns. Anyway yes, this one is needed.

> +PM_POST_THAW		Tasks have just been thawed after a resume or restore
> +			from a hibernation image

Symetrical with the previous one, useful for freeing firmware images, ok.

> +PM_HIBERNATION_PREPARE	The system is preparing for hibernation.  Tasks have
> +			been frozen, memory is going to be freed and devices
> +			are going to be suspended.

What is this one good for?

> +PM_SNAPSHOT_FAILED	The creation of hibernation image has failed.  Tasks
> +			will be thawed immediately.

Does this one need to be different from POST_THAW?

I do not see the need for the other chains. Notice that we do not
_want_ to have too many of them, because changing anything in the
hibernation will become impossible with 10 chains having intimate
details of suspend sequence.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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