linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <20090220182609.GA3289@srcf.ucam.org>
Date:	Fri, 20 Feb 2009 18:26:09 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Pavel Machek <pavel@....cz>
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 Hj?nnev?g <arve@...roid.com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	mark gross <mgross@...ux.intel.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 Fri, Feb 20, 2009 at 07:22:15PM +0100, Pavel Machek wrote:
>  On Mon 2009-02-16 23:23:30, 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 
> 
> ...for Arve's hardware. Not all embedded systems are like that, and
> OLPC / PCs are definitely not like that.

And PCs have enough latency over suspend/resume that we can't do it 
automatically in a non-intrusive manner anyway, so runtime pm is more 
interesting there as well.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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