[Xenomai-core] Scheduler extensions

[Xenomai-core] Scheduler extensions

[Jonas Flodin]

Hi!

I'm a PhD student who is currently doing research on multicore real-time 
scheduling. I'm considering using Xenomai as a base for my research 
experiments, but this would require me to replace or extend the current 
scheduler. So far I have found no documents detailing how the scheduler 
is implemented or how to extend it (if possible). Could you point me to 
information regarding the scheduler?

Thank you in advance.

BR
Jonas Flodin

Re: [Xenomai-core] Scheduler extensions

[Philippe Gerum]

On 05/08/2012 09:23 AM, Jonas Flodin wrote:
>
> Hi!
>
> I'm a PhD student who is currently doing research on multicore real-time
> scheduling. I'm considering using Xenomai as a base for my research
> experiments, but this would require me to replace or extend the current
> scheduler. So far I have found no documents detailing how the scheduler
> is implemented or how to extend it (if possible). Could you point me to
> information regarding the scheduler?
>

There is no documentation on the scheduling core. You should probably 
start with ksrc/nucleus/sched*.c, and include/nucleus/sched*.h, having a 
look at the files implementing the plain FIFO policy in sched-rt*.

Hint: the scheduling core is meant to be extensible, adding a new policy 
entails providing an implementation for a new struct xnsched_class 
object. Make sure to read the comments in the files implementing the 
existing policies (-rt, -sporadic, -tp), they usually mention details on 
the calling context and requirements for the handlers defined by the 
xnsched_class type.

> Thank you in advance.
>
> BR
> Jonas Flodin
>
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-- 
Philippe.