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

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Message-Id: <201001162321.53616.rjw@sisk.pl>
Date:	Sat, 16 Jan 2010 23:21:53 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>, omegamoon@...il.com
Cc:	"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, eric.y.miao@...il.com, utx@...guin.cz,
	zaurus-devel@...ts.linuxtogo.org
Subject: Re: [suspend/resume] Re: userspace notification from module

On Saturday 16 January 2010, Pavel Machek wrote:
> Hi!
> 
> > > Agreed, but so what? On PC, machine would power off at that
> > > point. That would surprise the apps, too.
> > > 
> > > Basically new enough userland should not make battery run low enough
> > > for either emergency power off or emergency suspend.
> > 
> > I wonder how it is supposed to achieve that without knowing the current battery
> > status.  Do you mean it should poll the battery driver?
> 
> That's besides point, is it?

Well, mentioned that first. :-)

> Usual kernel<->user interfaces should apply here.

And we're talking about the design of these, aren't we?  The notification about
the critical battery status sent to the user space is a part of the kernel-user
space interface too, after all.

Rafael
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