[LITMUS^RT] DEMO plugin problems

[Matteo Locatelli]

>You said your setup works without problem for PSN-EDF but not for the DEMO
scheduler? It’s difficult to imagine a possible root cause. >Anything else
that seems to be broken?

Yes, everything works fine with the other plugins, I have problems only
with the DEMO scheduler.

>Are you using rtspin -w and release_ts?

I cannot use rtspin -w and release_ts with the DEMO plugin because, when I
try to use the release_ts function an error appears saying that
"wait_for_ts_release(): function not implemented".

>Could it be that your trace buffer is too small or that the tracing
process is being starved?

I don't think it is starved, because I only run the tracing task and the
rtspin task. How can I make the trace buffer bigger?

Thanks for the reply.
Matteo

2017-07-20 15:30 GMT+02:00 Björn Brandenburg <bbb at mpi-sws.org>:

>
> > On 18. Jul 2017, at 10:10, Matteo Locatelli <matteo.locatelli1993 at gmail.
> com> wrote:
> >
> >
> > >The plotting script still is pretty much beta, so it doesn’t handle
> unexpected data very gracefully. If you send me your traces I can take a
> >look.
> >
> > Ok, I send you the trace as an attachment.
>
> I had a look at the file. The file appears to miss almost all events after
> creation of the real-time task until a (final?) completion record.
>
> [         0] NAME            1984/0     on CPU  0 rtspin
> [         0] PARAM           1984/0     on CPU  0 T=(cost: 10.00ms,
> period:100.00ms, phase:  0.00ms), part=0
> [     80453] COMPLETION      1984/1     on CPU  0
>
>
> Have a look at where sched_trace_task_switch_to() and
> sched_trace_task_switch_away() are being called. These call sites are
> completely independent of whatever plugin happens to be active — a plugin
> cannot prevent these events from being recorded. So if you cannot see any
> scheduling events (look with st-dump), then something is else is happening
> to the trace.
>
> Could it be that your trace buffer is too small or that the tracing
> process is being starved?
>
> You said your setup works without problem for PSN-EDF but not for the DEMO
> scheduler? It’s difficult to imagine a possible root cause. Anything else
> that seems to be broken?
>
> Are you using rtspin -w and release_ts?
>
> - Björn
>
>
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>
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