linux-kernel - Re: [RFD] Automatic suspend

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Message-Id: <200902170020.15509.oliver@neukum.org>
Date:	Tue, 17 Feb 2009 00:20:12 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	mark gross <mgross@...ux.intel.com>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Brian Swetland <swetland@...gle.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

Am Monday 16 February 2009 18:31:08 schrieb Arjan van de Ven:
> On Mon, 16 Feb 2009 17:48:06 +0100
> Oliver Neukum <oliver@...kum.org> wrote:
> 
> > > Userspace should just be the part that says "I'm interested in link
> > > notifications". The driver then just goes to the lowest power state
> > > for its device that still gives those notifications.
> > 
> > Should there be a channel through which drivers can tell user space
> > what the consequences in terms of reaching a sleep state are if a
> > service is requested?
> 
> Personally, I don't think so.
> Think about it: what would userspace do?
> Not ask for the functionality if it means no sleep state?
> Maybe it should just never ask for it then as a required functionality!

1. You may have a human being using the information to make the tradeoff.
2. User space may be able to select among several devices the one cheapest
to use

	Regards
		Oliver
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