linux-kernel - Re: [RFD] Automatic suspend

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Date:	Mon, 16 Feb 2009 21:43:52 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	"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>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	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

On Mon, 16 Feb 2009, Arjan van de Ven wrote:

> > Set the automatic PM parameters (idle timeout, state to go to,
> > etc.). And disabling automatic PM altogether (effectively the same as
> > setting the idle timeout to infinity).
> > 
> 
> shouldn't idle timeout etc be internal to the driver?
> Yes policy preferences / constraints makes sense to communicate,
> actual settings do not. For one they keep changing fast all the time
> anyway.

Sorry, I don't agree.  A single driver may control many different kinds
of device -- it may not even be aware of the distinction!  Consider the
SCSI disk driver: It has to handle both traditional rotating media and
solid-state disks.  Clearly they should have different runtime PM
parameters.  But the driver isn't in a good position to know what those
parameters should be.

Alan Stern

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