linux-kernel - Re: [RFC] sleepy linux

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Message-ID: <20071226190252.GC8094@elf.ucw.cz>
Date:	Wed, 26 Dec 2007 20:02:52 +0100
From:	Pavel Machek <pavel@....cz>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [RFC] sleepy linux

On Wed 2007-12-26 18:28:04, Oliver Neukum wrote:
> Am Mittwoch, 26. Dezember 2007 00:07:31 schrieb Pavel Machek:
> > Heute 00:07:31
> >    
> > This is RFC. It does not even work for me... it sleeps but it will not
> > wake up, because SATA wakeup code is missing. Code attached for illustration.
> > 
> > I wonder if this is the right approach? What is right interface to the
> > drivers?
> 
> IMHO you are making to many special cases. The system can be "sleepy"
> if all devices can be runtime suspended and all CPUs are idle.

Pretty much, except that "timer device" needs to be runtime suspended,
too... We probably should not sleep if wakeup is scheduled 1 second in
future.

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