linux-kernel - Re: [PATCH 1/8] PM: Opportunistic suspend support.

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Message-ID: <Pine.LNX.4.44L0.1005271008230.3239-100000@iolanthe.rowland.org>
Date:	Thu, 27 May 2010 10:09:06 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arve Hjønnevåg <arve@...roid.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Tejun Heo <tj@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nigel Cunningham <nigel@...onice.net>,
	Ming Lei <tom.leiming@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	<linux-doc@...r.kernel.org>
Subject: Re: [PATCH 1/8] PM: Opportunistic suspend support.

On Wed, 26 May 2010, Arve Hjønnevåg wrote:

> >> > And even if it isn't, so what?  What's wrong with looping behavior?
> >>
> >> It is a significant power drain.
> >
> > Not in the situation I was discussing.
> >
> 
> If you meant it spend most of the time suspended, then I agree. It
> only wastes power when a driver blocks suspend by returning an error
> from its suspend hook and we are forced to loop doing no useful work.

Exactly the same as the in-kernel opportunistic suspend implementation.

Alan Stern

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