[LITMUS^RT] Question about how to set task's release time in the base_task.c

[Meng Xu]

Hi Glenn,

Thank you very much for your reply. Yes, I used your feather trace  and
could record the release time and deadline of the job. But now I want to do
experiment that release all tasks at the same time. Because I want to
control the release time of each task, I think it's better to register the
release time in the base_task.c .

When I only do one experiment, that's fine, I can change the code in the
job.c and make it possible to release all task at the same time. But when I
want to do many experiments,  that's impossible to change the code in the
job.c each time. That's the reason why I think it's necessary to assign
release time in base_task.c.

Hi Giovani,

Yes, you are right. I can do it in the linux. In fact, we did that as you
said in linux. We register a timer for each task and release a job when the
timer expires. But in LITMUS, it forbids us to do that. So we have to use
the base_task.c as the task's implementation.


Meng

2012/10/8 Glenn Elliott <gelliott at cs.unc.edu>

> > Hi all,
> >
> > I want to run a task set in LITMUS. For each task in the task set, I
> want to assign an absolute time for it to release its 1st job. By doing
> that, I can record each job's response time and determine if the task
> misses its deadline or not.
> >
> > I looked around in the liblitmus folder, but didn't find any function
> that can assign a release time for the task.
> >
> > I found the release time of a task is assigned in release_at() in the
> litmus-rt/litmus/job.c file.
> > But I still don't know how to assign the task's release time inside the
> base_task.c file?
> >
> > Can anyone help me?
> >
> > Thank you very much for your time in this question!
> >
> > Best Regards,
> >
> > Meng XU
>
>
> Hi Meng,
>
> Depending upon how you are doing your processing, you may not need to use
> specific release times.  Litmus can be configured to log job release and
> completion times.  There is no need to make these measurements from the
> user-space.
>
> To get logging support, make sure "CONFIG_SCHED_TASK_TRACE=y" in your
> kernel's .config file.  See "Recording Scheduling Traces" here:
> https://wiki.litmus-rt.org/litmus/Tracing
>
> -Glenn
>
>
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