Scheduling Polices and soft realtime doubts in RTAI/Fusion

[Rodrigo Rosenfeld Rosas]

Thank you a lot Paolo! This information is enough for the class and it 
is good for understanding how the scheduling (can) works.

Sorry for not noticing the edf example...

Best Regards,

Rodrigo.

Paolo Mantegazza escreveu:

> Rodrigo Rosenfeld Rosas wrote:
>
>> First of all, thank you a lot for your reply. There are still some 
>> minor doubts that I hope you'll be able to elucidate me.
>>
>> When the tasks have the same priority how can I know if the policy 
>> will be FIFO or RR? And how can I choose which of them to use?
>>
>> When you say:
>> [RMS can easily be mapped on prio-based scheduling schemes.]
>>
>> You mean that I should change the code to add RMS or just to define 
>> previously the task priorities accordling to their periods? I think 
>> you meant the last one ("prio-based"), right?
>>
>
> In RTAI call "rt_spv_RMS", whenever needed, and your periodic tasks 
> should be scheduled according to RMS policy automatically.
>
>> [EDF requires a bit more work when doing this without some native 
>> support of the scheduler as it is the case with fusion.]
>>
>> Sorry, my English is not that good. Did you want to mean that fusion 
>> has native support or not? Which is the case in fusion? And if it has 
>> support, how can I enable it?
>>
>
> Instead of callin rt_task_wait_period call 
> rt_task_set_resume_end_times, see "/showroom/v3.x/kern/edf". Notice 
> that all edf tasks automatically assume a priority greater than any 
> existing task.
>
>
> PAolo.


	
	
		
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