On Sat, May 13, 2000 at 03:57:09PM +0100, Stuart Hughes wrote:
> Alain Rolle wrote:
> >
> > Hello,
> >
> > could anyone describe to me the effect of a RT task that is made periodic
> > with a period that is in fact smaller then the execution time needed by
> > the task ? What happens then ? If it is not to worry about, OK, but does
> > it make sense to do something like that ?
What will happen is that your task will run to completion, call the
scheduler and then run again.
We used to have a test in the scheduler to complain about this -- if
Linux never ran, and if you need it, I can put it in again in no time.
> >
>
> Hi Alain,
>
> The system will lock-up and eventually reboot. This is because it tries
> to keep up with absolute time, rather than slip deadlines. Depending on
> your point of view, this can be right/wrong. IMHO I would prefer a
> scheduler that allowed slips, but reports the problem. This is
> something we plan to do in the near future (how near depends on
> bandwidth :-)
>
> Regards, Stuart
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