[LITMUS^RT] Feather Trace Tool in LITMUS-RT

[Felipe Cerqueira]

Hi John,

st_trace only traces task events such as releases, deadlines and
context-switches of real-time jobs.
For it to work with the bash script, you need to launch your program with
rt_launch, found in liblitmus folder.
Otherwise the process will be considered a best-effort task and will not
show up in the scheduling trace.

Thanks,
Felipe


2013/11/13 Litmus ForLinux <litmustiger at gmail.com>

> Hi,
>
> I am a novice in Linux Kernel coding and I have found LITMUS to be
> interesting. I compiled and installed LITMUS-RT in my Linux (Ubuntu 12.04)
> as per the instructions given in the LITMUS website. Also I compiled
> feather trace tool in my LITMUS system.(including LIBLITMUS dependencies).
>
> How to use feather tool and trace the process (by its release and
> execution time) using the litmus logs. I execute a background process and
> tried to trace the process using feather tool. Following are the steps :
>
> 1. I wrote following shell script  (task.sh)-
>     ls
>     sleep 20
>     ls
>     sleep 20
>
> Then I executed the script in the background  - sh  task.sh &
> 2. Once the process starts to run in the background, I executed st_trace
> immediately.
> 3. Trace tool starts executing and it gives a message -
> "Press Enter to end tracing"
> I pressed enter after some time and got following -
> "Disabling 10 events .... /dev/litmus_sched_trace1: 0 bytes read."
>
> Because of this, are no contents inside the log file. If I try to execute
> some other task as mentioned in the feather trace tool documentation,
> "./st_trace global-exp" I encounter same "0 bytes read" message.
>
> Please help me to resolve this issue. I want to have to log file generated.
>
> Thanks
> John
>
>
> _______________________________________________
> litmus-dev mailing list
> litmus-dev at lists.litmus-rt.org
> https://lists.litmus-rt.org/listinfo/litmus-dev
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.litmus-rt.org/pipermail/litmus-dev/attachments/20131113/4f76d5bb/attachment.html>