Re: RT task scheduling

[Bill Huey (hui) <billh@gnuppy.monkey.org>]

On Sat, Apr 08, 2006 at 09:25:30AM +0200, Ingo Molnar wrote:
> > to the contrary, the "RT overload" code in the -rt tree does strict, 
> > system-wide RT priority scheduling. That's the whole point of it.
> 
> so after this "clarification of terminology" i hope you are in picture 
> now, so could you please explain to me what you meant by:

> > > You should consider for a moment to allow for the binding of a 
> > > thread to a CPU to determine the behavior of a SCHED_FIFO class task 
> > > instead of creating a new run category. [...]
> 
> to me it still makes no sense, and much of the followups were based on 
> this. Or were you simply confused about what the scheduling code in -rt 
> does precisely? Did that get clarified now?

The last time I looked at it I thought it did something pretty simplistic
in that it just dumped any RT thread to another CPU but didn't do it in
a strict manner with regard to priority. Maybe that's changed or else I
didn't pay attention to it that as carefully as I thought.

As far as CPU binding goes, I'm wanting a method of getting around the
latency of the rt overload logic in certain cases at the expense of
rebalancing. That's what I ment by it.

bill