Re: [PATCH] s390 (9/9): no timer interrupts in idle.

From: Arjan van de Ven
Date: Thu Apr 22 2004 - 03:56:28 EST

On Thu, Apr 22, 2004 at 10:48:11AM +0200, Martin Schwidefsky wrote:
> > is this generally useful, eg can all architectures use the
> > infrastructure you propose ? I seriously hope so; s390 isn't the only
> > one who would benefit, I'd love to see a generic thing for this.
> It is. All you have to do is to rework the timer functions for the
> architecture you want to support. This can be quite complicated
> though. There are some subtle races if you want to switch of the
> 100 HZ timer for a cpu. We had some problem with cpus that didn't
> want to wake up anymore ...

well my worry is the API; should it be "turn the timer off" or should it be
"the next tick is THIS many from now". The later allows one to use the hw in
one-shot mode (PC's can do this) where the scheduler timeslice expiry ends
up being a timer as well.

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