linux-kernel - Re: Hibernation considerations

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Message-ID: <87k5syg3yi.fsf@jbms.ath.cx>
Date:	Tue, 17 Jul 2007 16:39:17 -0400
From:	Jeremy Maitin-Shepard <jbms@....edu>
To:	david@...g.hm
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Huang\, Ying" <ying.huang@...el.com>,
	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Al Boldi <a1426z@...ab.com>
Subject: Re: Hibernation considerations

david@...g.hm writes:

[snip]

> the non-ACPI hibernate behaves very differently, and for some people (and I
> think I am one of them) it will meet their needs better then _any_ of the ACPI
> suspends.

It may have certain differences from the user point of view, but from
the implementation view, it seems that it is nearly exactly the same.
The only differences seem to be: 

 - rather than shutting down, do whatever is necessary to stick the
   system in S4 state.

 - make sure ACPI isn't initialized by the "load image" kernel

 - rather than "resume from hibernate" ACPI by initializing it normally,
   issue the special hibernate-related methods.

Thus, it seems that supporting ACPI S4 will have a very minimal affect
on the hibernate implementation.

-- 
Jeremy Maitin-Shepard
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