Re: periods and deadlines in SCHED_DEADLINE

[Bjoern Brandenburg]

On Jul 10, 2010, at 9:08 AM, Raistlin wrote:

>> 
>> As a side note, almost all global EDF hard real-time admission tests can handle tasks with constrained deadlines transparently. However, as far as I can tell, they do not apply to SCHED_DEADLINE.
>> 
> This is the only part I am not sure I got... Can you explain me what do
> you mena by "they do not apply" ?

I was under the impression that the kernel implementation is a P-EDF implementation. Now it seems to me that it is in fact a "P-EDF with frequent migrations" implementation. I'd be hesitant to just assume that it "approximates G-EDF" sufficiently well to apply any of the published G-EDF tests.

- Björn

---
Björn B. Brandenburg
Ph.D. Student 
Dept. of Computer Science
University of North Carolina at Chapel Hill
http://www.cs.unc.edu/~bbb




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