Interrupt latency problems on MPC860

[Joel Sherrill]

Eric Norum wrote:
> 
> Another way to get interrupt latencies down a little is to move the
> `tick()' processing to a high-priority task and have the timer interrupt
> handler send an event to this task.  The tradeoff is a little more time
> spent handling the timer/tick(), but now the tick() handling is
> interruptible.

Every so often this has been proposed and could be implemented 
generically as an optional capability.  If someone chooses to implement
this, I would like to see it available to all BSPs as an option.

Since we have a generic clock driver template that can be instantiated,
this would be a natural place to address it.

> --
> Eric Norum                                 eric.norum at usask.ca
> Department of Electrical Engineering       Phone: (306) 966-5394
> University of Saskatchewan                 FAX:   (306) 966-5407
> Saskatoon, Canada.

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