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SubjectRe: Scheduler problems

On Tue, 19 Jan 1999, Stephen C. Tweedie wrote:

> What it will _not_ do is to preempt a process already running on that
> other CPU. From reschedule_idle():
>
> * [We can try to preempt low-priority processes on other CPUs in
> * 2.3. Also we can try to use the avg_slice value to predict
> * 'likely reschedule' events even on other CPUs.]
>
> Ingo, any thoughts? Seems that if for any reason all wakeup interrupts
> arrive at the same CPU which is running the SCHED_FIFO task, then we
> will _never_ perform any successful wakeups without first exhausting the
> other CPU's current timeslice.

yes i have a patch for this but it's not straightforward enough for 2.2.
(ie. a 50k patch) It has to do things like a full goodness() run for every
CPU in wakeup(), which is less than ideal.

-- mingo


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