linux-kernel - Re: [RFC PATCHv2 2/2] PM: compile-time configuration of device suspend/resume watchdogs.

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Message-ID: <20130512000559.GA22567@amd.pavel.ucw.cz>
Date:	Sun, 12 May 2013 02:05:59 +0200
From:	Pavel Machek <pavel@....cz>
To:	Colin Cross <ccross@...roid.com>
Cc:	Zoran Markovic <zoran.markovic@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Todd Poynor <toddpoynor@...gle.com>,
	San Mehat <san@...gle.com>, Benoit Goby <benoit@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [RFC PATCHv2 2/2] PM: compile-time configuration of device
 suspend/resume watchdogs.

Hi!

> >> Power management debug option to configure device suspend/resume watchdogs.
> >> Available options are:
> >>   1. Enable/disable the feature.
> >>   2. Select triggered watchdog action between:
> >>         - system panic (default)
> >>         - dump stacktrace
> >>         - log event
> >>   3. Select timeout value for the watchdog(s).
> >
> > People disliked the previous behaviour, so you add 10 config
> > options... with different behaviours. Also 1 second timeout is not
> > acceptable for endusers (will break the system), so it should not be
> > offered. In fact, remove that option, too. People doing that kind of
> > debugging can modify the sources, right?
> 
> Greg KH asked for more configurable options.  I agree this may be a
> little too far (I would replace the action choice with a simple "panic
> on timeout?"), but its better than it was before.  Also, a 1 second
> timeout is perfectly reasonable, especially if you configure it to
> dump a stack trace but not panic.  Mobile devices normally finish
> suspending within a few hundred ms.

For stack dump, yes that's ok.

Maybe it ends up less ugly if it will be runtime-configurable?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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