[GSOC - Tracing] Status Update

[Vidushi Vashishth]

>which use case does this address? What is the connection to an RTEMS
application?
This converts the trace buffering of the fileio sample testcase output to
CTF. This pertains to the function tracing testcase. The CTF stream
generated records the entry and exit of the calloc, malloc, realloc and
free functions and also the values of the arguments and return values.

>Why do I need sudo to run the commands?
The command needs permission to create a directory for the traces. The
command did not work without this.

>Why do I need your babeltrace? Not being able to use a tool from a
standard distribution makes it harder to do RTEMS tracing.
I wanted to work on integrating barectf with RTEMS trace linker instead. I
documented the approach in: https://vidushivashishth.github.io/sixthpost/.
I was stuck on deciding the yaml configuration input for the process and
sent out an email for this discussion on the mailing list as well. I have
however finally created one. I can continue work on the barectf approach if
that is okay with you? I will start a new thread on this with the
configuration file I have chosen?

>What can I do with a metadata stream and the CTF trace stream?
These can be transported to the host and then viewed using Trace Compass.

I lost some time trying to figure things out on my own. I will be more
frequent in communicating places where I am stuck. Apologies for the same.


On Thu, Jun 28, 2018 at 10:42 AM, Vidushi Vashishth <reachvidu at gmail.com>
wrote:

> >Run on what? RTEMS?
> yes.
>
> >Are there any RTEMS repos with your work?
> I havent pushed my code since it is throwing errors. Should I push it
> nonetheless for you to see? Or create another repo?
>
> >RTEMS does not support `system()`.
> Does RTEMS support fdopen or popen? I am trying to execute the babeltrace
> command on the shell, from within the c program. I could use babeltrace C
> API instead but Gedare suggested during a meeting that it might not be
> integrable with RTEMS.
>
> >Could please explain how you are integrating `program.c`?
> I have created a new shell utility function in the
> *rtems/cpukit/libmisc/shell/main_rtrace.c*. It saves the raw trace buffer
> to a file and then uses the logic of `program.c`
> to convert it into CTF traces.
>
>
> On Thu, Jun 28, 2018 at 10:07 AM, Chris Johns <chrisj at rtems.org> wrote:
>
>> On 28/06/2018 13:48, Vidushi Vashishth wrote:
>> >
>> > Sorry for the delay. I had been trying to make the code run.
>>
>> Run on what? RTEMS?
>>
>> > https://github.com/VidushiVashishth/babeltrace/tree/master/Demo
>>
>> Are there any RTEMS repos with your work?
>>
>> > This is a demonstration of the how to use babeltrace to convert rtems
>> traces. I
>> > have integrated the program.c code in the rtems main_rtrace.c file.
>> This is
>> > throwing some errors that I am working on.
>>
>> RTEMS does not support `system()`.
>>
>> Could please explain how you are integrating `program.c`?
>>
>> Thanks
>> Chris
>>
>
>
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