linux-kernel - Re: Hibernation considerations

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Message-ID: <Pine.LNX.4.64.0707171337290.2467@asgard.lang.hm>
Date:	Tue, 17 Jul 2007 13:39:10 -0700 (PDT)
From:	david@...g.hm
To:	Jeremy Maitin-Shepard <jbms@....edu>
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

On Tue, 17 Jul 2007, Jeremy Maitin-Shepard wrote:

> 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.

from what Rafael is saying supporting ACPI S4 mode requires a very 
fundamentally different restore approach, and in addition imposes very 
different restrictions on what can be done with the machine while it's 
suspended.

David Lang
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