linux-kernel - Re: Attempted summary of suspend-blockers LKML thread

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Message-ID: <20100807143620.GB19600@linux.vnet.ibm.com>
Date:	Sat, 7 Aug 2010 07:36:20 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	david@...g.hm, Brian Swetland <swetland@...gle.com>,
	kevin granade <kevin.granade@...il.com>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	pavel@....cz, florian@...kler.org, stern@...land.harvard.edu,
	peterz@...radead.org, tglx@...utronix.de, alan@...rguk.ukuu.org.uk
Subject: Re: Attempted summary of suspend-blockers LKML thread

On Sat, Aug 07, 2010 at 02:07:18PM +0100, Mark Brown wrote:
> On Fri, Aug 06, 2010 at 05:36:42PM -0700, Paul E. McKenney wrote:
> > On Sat, Aug 07, 2010 at 01:14:32AM +0100, Mark Brown wrote:
> 
> > > services in themselves (like system monitoring).  It's really just
> > > semantics to treat them differently to something like a cellular modem -
> > > at a high level they're both just independant processors ticking away
> > > without the application processor.
> 
> > I agree that a smartphone's cellular modem can be argued to be very
> > similar to wake-on-LAN.  The smartphone applications that seem to me
> > to be very different from wake-on-LAN are things like audio playback,
> > where the system is providing service to the user during the time that
> > it is suspended.
> 
> The cellular modem case includes not just hanging off the network but
> also being on a call - the voice path for a phone call doesn't need the
> CPU to do anything.  It's probably best to view a phone as a bunch of
> interconnected systems that happen to sit in the same box, and there's
> various design decisions that can be taken about which systems own the
> shared components.

OK, apologies, I thought you were talking about the wait-for-a-call case.
If there actually is a call ongoing, then the user perceives the system as
doing something, so this is similar to audio playback and quite different
from wake-on-LAN or system monitoring.

							Thanx, Paul
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