linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <20090222134618.GA1436@ucw.cz>
Date:	Sun, 22 Feb 2009 14:46:18 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	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

Hi!

> > > The recent descussion about the Android PM patches sent by Arve shows that
> > > there is a need to introduce a mechanism allowing us to:
> > > (1) automatically put the system as a whole into a sleep state (eg. suspend to
> > >     RAM) when it is found to be "idle", where the meaning of "idle" has to be
> > >     defined too,
> > 
> > Well; I'd prefer to keep the interface very minimal.
> > 
> > If no devices are being used,
> 
> We'll need some kind of infrastructure to detect such situations.

Yes, I like the latest 'atomic_t + bit in struct device' ideas...
 
> > and next wakeup is far enough in the future,
> 
> What exactly do you mean by "next wakeup"?

Next timer in kernel and next sleep/select timeout in userspace.

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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