Re: [Xenomai-help] New scheduler class

[Jan Kiszka <jan.kiszka@domain.hid>]

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Gilles Chanteperdrix wrote:
> Henri Roosen wrote:
>> Ok, I might give Jan's proposal a try and could be sufficient for us:a
>> Xenomai thread with non-RT scheduling class (didn't know that was
>> possible).
>>
>> We just need the thread in the Xenomai domain for being able to access
>> Xenomai resources, but want it to be scheduled together with the Linux
>> nice levels. A near IDLE nice level should be ok. We just don't want
>> that our Xenomai 'idle' thread with a while(1) would prevent Linux to
>> run.
> 
> That will happen with SCHED_OTHER if while(1) occurs while running in
> primary mode.
> 

Indeed. But that's in fact a deficit of our mapping of non-RT sched
policies on the Xenomai scheduler. We should not leave, e.g., a
SCHED_OTHER thread migrated in primary as long as it does not hold any
resources. We can't perform SCHED_OTHER scheduling in Xenomai, we have
to push this to Linux.

Jan


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