Re: Attempted summary of suspend-blockers LKML thread

Mark Brown
2010-08-07T13:07:18Z

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.