linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <20090227204615.GC1387@ucw.cz>
Date:	Fri, 27 Feb 2009 21:46:15 +0100
From:	Pavel Machek <pavel@....cz>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Alan Stern <stern@...land.harvard.edu>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Arve Hj?nnev?g <arve@...roid.com>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Arjan van de Ven <arjan@...radead.org>,
	Kyle Moffett <kyle@...fetthome.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	mark gross <mgross@...ux.intel.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 Fri 2009-02-27 11:09:45, Chris Friesen wrote:
> Pavel Machek wrote:
>> On Mon 2009-02-23 15:04:22, Oliver Neukum wrote:
>
>>> We can just as well have a class of tasks less important than power
>>> saving. They'd just run when power saving is not active for some other
>>> reason. Just like other such schemes we end up with the problem
>>> of priority inversion with locking.
>>
>> Ok, I guess this could be interesting in some cases... maybe. What are
>> real examples of such tasks?
>
> Some people might put casual system monitoring tools into this  
> category--top, xload, gkrellm, xclock, etc.

I guess system monitoring should stop itself when screen is
blanked... no need to compute list of processes if user can't see the
output.

But I see that may be slightly hard for command-line tool like
top. .... but it still seems like right solution. Why waste power/cycles
displaying xclock at tty9 when user is looking at tty10?

> It'd be nice if the animated banner ad in my web browser could be  
> treated this way. :)

Well, my web browser already has an option 'animate once'. No need to
waste power with that at all :-).
							Pavel 
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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