Re: [PATCH 0/8] Suspend block api (version 8)

Matthew Garrett
2010-05-27T17:16:44Z

On Thu, May 27, 2010 at 07:13:11PM +0200, Peter Zijlstra wrote:
> On Thu, 2010-05-27 at 18:07 +0100, Matthew Garrett wrote:
> > No. The useful property of opportunistic suspend is that nothing gets
> > scheduled. That's fundamentally different to a deep idle state.
>
> I think Alan and Thomas but certainly I am saying is that you can get to
> the same state without suspend.
>
> Either you suspend (forcefully don't schedule stuff), or you end up
> blocking all tasks on QoS/resource limits and end up with an idle system
> that goes into a deep idle state (aka suspend).
>
> So why isn't blocking every task on a QoS/resource good enough for you?

Because you may then block them in such a way that they never handle an
event that should wake them.

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