linux-kernel - Re: [RFD] Automatic suspend

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Message-Id: <200902181001.36927.jbarnes@virtuousgeek.org>
Date:	Wed, 18 Feb 2009 10:01:35 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Brian Swetland <swetland@...gle.com>,
	Arjan van de Ven <arjan@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Alan Stern <stern@...land.harvard.edu>,
	Kyle Moffett <kyle@...fetthome.net>,
	Oliver Neukum <oliver@...kum.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	mark gross <mgross@...ux.intel.com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

On Wednesday, February 18, 2009 9:52 am Matthew Garrett wrote:
> On Wed, Feb 18, 2009 at 09:48:04AM -0800, Jesse Barnes wrote:
> > I think "powernag" would be a better name, and it would probably work
> > pretty well.  Users would be notified that certain apps should probably
> > be shut down while they're on battery, and nag the authors to fix it.
>
> How do you usefully tell the difference between an application that's
> waking up a lot because it's dumb and an application that's waking up a
> lot because it's doing something useful? One downside of powertop is
> that it's resulted in a lot of "How do I reduce the number of wakeups
> caused by i8042 whenever I use the mouse"-type questions. We don't want
> innocent app writers to be hit by this kind of thing.

Well Ben did mention that it would be hard to figure out a good set of 
heuristics, but a userspace app could be pretty flexible, allowing the user 
to whitelist apps they know are fine, average the data over a period of time, 
etc.  Challenging, sure, but it should be possible to come up with something 
that's useful in many cases.

-- 
Jesse Barnes, Intel Open Source Technology Center
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