Re: Function tracing not working

On 2025-06-06 10:37, David Aldrich wrote:
> Hi Mathieu
> 
>> Indeed, You will also need to enable something like this:
>>
>> lttng enable-event --userspace 'lttng_ust_cyg_profile:*'
>>
>> See "man 3 lttng-ust-cyg-profile" for details.
> 
> Thanks for this. I used your suggested command and can now see the
> Flame Chart (Incubator). However, I only see symbol addresses, not the
> actual symbolic names.
> 
> I compile with:
> 
> -O3 -pg -finstrument-functions
> 
> Do I need any other compiler/linker options to resolve the symbol names?

Yes. Resolving addresses to symbol names requires to know the
base addresses where the executable mappings are loaded.

See:

man 7 babeltrace2-filter.lttng-utils.debug-info

for a detailed explanation about what needs to be enabled.

Thanks,

Mathieu


> 
> Best regards
> David


-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com