linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <20090218004547.GB26292@linux.intel.com>
Date:	Tue, 17 Feb 2009 16:45:47 -0800
From:	mark gross <mgross@...ux.intel.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...radead.org>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Alan Stern <stern@...land.harvard.edu>,
	Kyle Moffett <kyle@...fetthome.net>,
	Oliver Neukum <oliver@...kum.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.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>,
	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, Feb 16, 2009 at 11:23:30PM +0000, Matthew Garrett wrote:
> On Tue, Feb 17, 2009 at 12:19:38AM +0100, Rafael J. Wysocki wrote:
> 
> > This, again, seems to be a bit x86-centric. :-)  The Android people are telling
> > us that on the hardware they deal with it does make sense to put the entire
> > system to sleep even for relatively short periods of time, since the latencies
> > involved are not too bad.
> 
> Arve said that the power state was equivalent in idle and suspend, but 
> that they preferred suspend because it stopped any periodic timers. I'd 
> be more interested in making sure that unnecessary timers aren't running 
> than focusing on automatically entering system-wide suspend - Nokia have 
> been managing this since 2005 with good results.
>

I think they where talking timers as hardware devices pulling electrons,
not SW timers triggering wake ups.  I guess the timer hardware could be
running, and pulling power, even when not programmed to trigger any
event or IRQ.

--mgross
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