linux-kernel - Re: [RFC] sleepy linux

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Message-Id: <200712262123.37152.oliver@neukum.org>
Date:	Wed, 26 Dec 2007 21:23:37 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Pavel Machek <pavel@....cz>
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

Am Mittwoch, 26. Dezember 2007 21:17:22 schrieb Pavel Machek:
> 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.
> 
> Is there an easy way to tell if all the devices are runtime suspended?

Do you really want to know whether they are suspended or whether they
could be suspended?

> I guess I need to know from atomic context :-(.

Urgh. suspend() must be able to sleep and can fail.

	Regards
		Oliver
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