linux-kernel - Re: [PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 8)

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Message-ID: <Pine.LNX.4.44L0.0804141049370.2236-100000@iolanthe.rowland.org>
Date:	Mon, 14 Apr 2008 10:51:34 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	David Brownell <david-b@...bell.net>
cc:	benh@...nel.crashing.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Greg KH <greg@...ah.com>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Pavel Machek <pavel@....cz>, Oliver Neukum <oliver@...kum.org>,
	Nigel Cunningham <ncunningham@...a.org.au>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] PM: Introduce new top level suspend and hibernation
 callbacks (rev. 8)

On Sun, 13 Apr 2008, David Brownell wrote:

> I sort of agree.  Looking at it from a whole-system perspective,
> suspending needs to be able to chitchat with userspace ... and I
> don't think that can be done *before* writing to /sys/power/state
> in an acceptably generic/portable way.  (Briefly, applications
> need to have clean stopping points and be able to arrange system
> wakeup.  They may well have more work to do than most drivers.)

Pavel's recent work aside, the only way to initiate a system sleep is 
from userspace.  So it seems natural for all application notifications 
to be made by the initiating program, perhaps via dbus.

Alan Stern

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