linux-kernel - Re: [suspend/resume] Re: userspace notification from module

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Message-ID: <20100119051537.GA22153@elf.ucw.cz>
Date:	Tue, 19 Jan 2010 06:15:38 +0100
From:	Pavel Machek <pavel@....cz>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Andy Walls <awalls@...ix.net>,
	Eric Miao <eric.y.miao@...il.com>, omegamoon@...il.com,
	dbaryshkov@...il.com, Cyril Hrubis <metan@....cz>,
	arminlitzel@....de, linux-kernel@...r.kernel.org,
	Dirk@...er-online.de, Stanislav Brabec <utx@...guin.cz>,
	lenz@...wisc.edu, rpurdie@...ys.net,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Bart?omiej Zimo? <uzi18@...pl>,
	zaurus-devel@...ts.linuxtogo.org,
	Daniel Borkmann <danborkmann@...glemail.com>,
	thommycheck@...il.com
Subject: Re: [suspend/resume] Re: userspace notification from module

On Sun 2010-01-17 13:26:18, Russell King - ARM Linux wrote:
> On Sun, Jan 17, 2010 at 02:07:39PM +0100, Pavel Machek wrote:
> > AFAICT following message would be nice.
> > 
> > 1) battery is critical, userspace please do something
> > 
> > On zaurus and similar, you could add
> > 
> > 2) oh and btw we had power failure so we suspended (or maybe -- so
> > hardware suspended itself -- rmk's examples and old apm systems); we
> > are now back and running
> > 
> > notification... but... ideally those power failures should never
> > happen anyway, so... having this notification is in no way neccessary.
> 
> There's another consideration here: the more complex the emergency
> procedure, the higher the chance of _something_ causing it to fail,
> and if it does fail, the result is data loss.

That's why I propose to only send notification after we resume from
emergency suspend :-).

> In a properly running system, this isn't something that's going to
> get a lot of testing, so there's a higher chance that there will be
> bugs, so the simpler the solution, the better.

Unfortunately, with old battery in zaurus, I tested it rather a lot. I
have new one now, but I can still use old one for testing.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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