linux-kernel - Re: [RFC] sleepy linux

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Message-Id: <200712270015.40165.oliver@neukum.org>
Date:	Thu, 27 Dec 2007 00:15:39 +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 21:32:58 schrieb Pavel Machek:
> On Wed 2007-12-26 21:23:37, Oliver Neukum wrote:
> > Am Mittwoch, 26. Dezember 2007 21:17:22 schrieb Pavel Machek:

> > > 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?
> 
> If they are suspended.
> 
> My plan is: let the drivers autosuspend on their own. If I see all of
> them are autosuspended, then it looks like great time to put whole
> system into s2ram...

Your calculation of cost/benefit will be wrong. A driver will have timeouts
based on the cost of a suspend/resume cycle of that device only.
You'd have to calculate of keeping the whole system awake against that.

	Regards
		Oliver
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