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

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Message-Id: <201005280001.07364.rjw@sisk.pl>
Date:	Fri, 28 May 2010 00:01:07 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	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>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

On Thursday 27 May 2010, Thomas Gleixner wrote:
> On Thu, 27 May 2010, Alan Stern wrote:
> 
> > On Thu, 27 May 2010, Thomas Gleixner wrote:
> > 
> > > Crap. Stop beating on those lost wakeup events. If we lose them then
> > > the drivers are broken and do not handle the switch over correctly. Or
> > > the suspend mechanism is broken as it does not evaluate the system
> > > state correctly. Blockers are just papering over that w/o tackling the
> > > real problem.
> > 
> > That's the point -- suspend does not evaluate the system state 
> > correctly because it doesn't have the necessary information.  Suspend 
> > blockers are a way of providing it that information.  They don't paper 
> > over the problem; they solve it.
> 
> Nonsense. The system state is well defined when a event is pending and
> we just have to say good bye to the idea that forced suspend is a good
> solution. It's not as it does not guarantee the event processing in
> badly written apps and it does move the power consumption to a later
> point in time for those apps which acquire/drop the blockers.

Well, now you have stated that Android actually doesn't work. :-)

Rafael
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