[lttng-dev] lttng-dev Digest, Vol 156, Issue 3

Ramesh Errabolu ramesh.errabolu at gmail.com
Tue Apr 6 19:56:39 EDT 2021

Will try the dummy app to check if the basic setup is good. Wondering if
being able to trace shared libraries is something not supported.


On Tue, Apr 6, 2021 at 6:46 PM Jonathan Rajotte-Julien <
jonathan.rajotte-julien at efficios.com> wrote:

> > I followed your command sequence and noticed a bunch of files being
> > created. However when I tried to run babeltrace on these outputs I don't
> > see any of the functions that should have been called.  Including below
> the
> > search for symbols.
> At least userspace tracing seems to work.
> I would recommended, again, that you first try tracing on a dummy
> application, a
> really simple one. Then move to the usage of cyg_profile on that dummy app
> then
> to your application.
> The cyg profile events are the following:
>   lttng_ust_cyg_profile_fast:func_entry
>   lttng_ust_cyg_profile_fast:func_exit
> and, when using liblttng-ust-cyg-profile.so:
>   lttng_ust_cyg_profile:func_entry
>   lttng_ust_cyg_profile:func_exit
> I would recommend that you first start grep-ing (lttng_ust_cyg) for this
> in the
> trace to see if any is getting hit and recorded. If it is not the case,
> take a
> step back try with a dummy app and if nothing works with the dummy app we
> can at
> least try to help you from there and remove all other variable since you
> will be
> able to share the dummy app with us.
> Cheers
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