Re: [Linux-hls-devel] HLS errors appearing with cpu reservations

[Luca A. <luc...@em...>]

Hi Paul,

I reproduced the bug, and I think I fixed it.

This was the problem: hourglass does first a sched_setscheduler(p,
SCHED_FIFO, ...), and then does another sched_setscheduler() to schedule
it with the res scheduler. But the first setsched() transformed the task
in a regular linux task, and the second one complained about this fact
without changing the task to HLS...

Now, it should work. Have a look at the patch on the cvs commit mailing
list (it will appear in the anonymous cvs in 1 or 2 days).

This brings up a question: what should we do when a sched_setscheduler()
is performed on an HLS task changing the policy to SCHED_FIFO, SCHED_RR,
or SCHED_OTHER?
Two possibilities:
1) do nothing (the task remains an HLS task)
2) transform the task in a regular linux task. This is a little bit
conterintuive, because regular linux task are scheduled in background
respect to HLS tasks...

Other possibilities would require to know the scheduler hierarchy in
advance...

Ideas and suggestions are welcome.

			Thanks,
				Luca
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