linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <d6200be20902172111y16debabaq85b8f58520f4079a@mail.gmail.com>
Date:	Tue, 17 Feb 2009 21:11:31 -0800
From:	Arve Hjønnevåg <arve@...roid.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	"Woodruff, Richard" <r-woodruff2@...com>,
	Brian Swetland <swetland@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Kyle Moffett <kyle@...fetthome.net>,
	Oliver Neukum <oliver@...kum.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	mark gross <mgross@...ux.intel.com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Len Brown <lenb@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [RFD] Automatic suspend

On Tue, Feb 17, 2009 at 4:04 PM, Arjan van de Ven <arjan@...radead.org> wrote:
> On Tue, 17 Feb 2009 09:32:46 -0600
> "Woodruff, Richard" <r-woodruff2@...com> wrote:
>
>> > so use range timers / timer slack for those apps that you do not
>> > trust. That is not a big deal, and solves the issue of timer
>> > wakeups...
>>
>> I not so sure it is that straight forward in practice.  End systems
>> integrate a lot of 3rd party software who view performance 1st and
>> have no thought of power.
>
> you know that with the range timers/slack, you can control the
> "rounding" of the timer of the application, right?
> You can *directly* throttle the number of wakeups an application causes
> that way to a value you set.

I thought the point of range timers was to align multiple timers so
they wakeup at the same time, not to throttle individual timers.

-- 
Arve Hjønnevåg
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