linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

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Date:	Fri, 28 May 2010 08:28:06 -0400
From:	Theodore Tso <tytso@....EDU>
To:	Theodore Tso <tytso@....edu>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>, felipe.balbi@...ia.com,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)


On May 28, 2010, at 8:16 AM, Theodore Tso wrote:
> 
> I've seen very hard to debug situations  with Maemo where users are essentially asked to uninstall all their applications, and then install them back one at a time, waiting several hours between each install for a charge/discharge cycle, to figure out which application was waking up the system so !@#@! much while the screen was turned off.   And, when the periodic wakeups are faster than the refresh time of powertop, no, powertop won't help you find the crapplication.   

Sorry, miswording:   s/faster/less frequent/

I'm not convinced CPU activity LEDs help either, BTW.    It only takes the CPU getting crowbarred out of idle for a tiny amount of time before you start impacting battery life, and if the crapplication is only doing it every 30-60 seconds or so, I doubt you'd see it on the LED's....  that sort of thing might be acceptable if you have a 1-3 pound battery, but maybe much less so if you have a bettery which is cell-phoned sized.

-- Ted


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