Re: [PATCH 1/8] PM: Add suspend block api.

Matthew Garrett
2010-05-06T18:44:18Z

On Thu, May 06, 2010 at 11:33:35AM -0700, Tony Lindgren wrote:
> * Matthew Garrett <mjg@redhat.com> [100506 10:39]:
> > On Thu, May 06, 2010 at 10:38:08AM -0700, Tony Lindgren wrote:
> >
> > > If your userspace keeps polling and has runaway timers, then you
> > > could suspend it's parent process to idle the system?
> >
> > If your userspace is suspended, how does it process the events that
> > generated a system wakeup? If we had a good answer to that then suspend
> > blockers would be much less necessary.
>
> Well if your hardware runs off-while-idle or even just
> retention-while-idle, then the basic shell works just fine waking up
> every few seconds or so.

And the untrusted userspace code that's waiting for a network packet?
Adding a few seconds of latency isn't an option here.

--
Matthew Garrett | mjg59@srcf.ucam.org