linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <20090216145559.5412b909@infradead.org>
Date:	Mon, 16 Feb 2009 14:55:59 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Pavel Machek <pavel@...e.cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	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

On Mon, 16 Feb 2009 23:51:16 +0100
Pavel Machek <pavel@...e.cz> wrote:

> 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.

but spin down happens on non-activity ;)
it's more a slumber than a power down



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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