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Message-ID: <20090216225116.GG1370@ucw.cz>
Date: Mon, 16 Feb 2009 23:51:16 +0100
From: Pavel Machek <pavel@...e.cz>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Arjan van de Ven <arjan@...radead.org>,
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!
> > Userland should never ever control the state of a device like this
> > directly. It should do so by a) closing the device and b) setting
> > latency / functional requirements.
>
> The user, however, may want to forcibly put a device into a low power state
> without stopping all of the applications that depend on it (eg. have it open).
> Do you think that we shouldn't allow users to do such things?
I don't think we should do this... of you want device to be powered
down, just don't keep it open. revoke should be enough :-).
...one execption here is the disk driver; unmounting filesystems to
let the disk spin down is probably too heavy.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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