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

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Message-Id: <201001162331.15405.rjw@sisk.pl>
Date:	Sat, 16 Jan 2010 23:31:15 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	Stanislav Brabec <utx@...guin.cz>,
	Eric Miao <eric.y.miao@...il.com>,
	"Bart?omiej Zimo?" <uzi18@...pl>, Andy Walls <awalls@...ix.net>,
	Daniel Borkmann <danborkmann@...glemail.com>,
	linux-kernel@...r.kernel.org, rpurdie@...ys.net, lenz@...wisc.edu,
	Dirk@...er-online.de, arminlitzel@....de,
	Cyril Hrubis <metan@....cz>, thommycheck@...il.com,
	"linux-arm-kernel" <linux-arm-kernel@...ts.infradead.org>,
	dbaryshkov@...il.com, omegamoon@...il.com,
	zaurus-devel@...ts.linuxtogo.org
Subject: Re: [suspend/resume] Re: userspace notification from module

On Saturday 16 January 2010, Pavel Machek wrote:
> > > IMHO it should just plain shutdown in that case.  Suspending doesn't really
> > > solve the problem, because the battery is going to drain still.  Unless you
> > > mean suspend=hibernate, but I guess you don't.
> 
> BTW I was talking spitz before, but there's collie, too. It was
> shipped in configuration where all user data was in RAM and RAMdisk --
> no writable flash. On such machine, shutdown is never option. (And
> yes, such design was very common in windowsCE days).
> 
> Spitz got disk, but inherited that powermanagement design; and it
> works very well.
> 
> And now, if you want collie for a year (or two), you can have
> mine... it still works and battery still lasted for 5 hours 2 years
> ago -- not bad for 10 year old battery. You'll note that it is very
> different design from PC.

Well, I guess I wouldn't have the time to study it anyway, so thanks. :-)

All in all, it looks like these particular platforms are just specific design
having special requirements.  And even on these platforms sending a battery
critical notification to the user space before the kernel emergency suspends
(or shuts down or whatever) the system seems to be a good idea in general.

Rafael
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