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 Cha
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 sy
On 2025-06-05 06:49, David Aldrich wrote:
Hi Mathieu
I'd like to add some more detail. I now run our app using this pattern:
LD_PRELOAD=liblttng-ust-cyg-profile.so ./app
On importing the trace into TraceCompass I see:
"null analysis for LTTng-UST CallStack"
Could the reason be the lttng com
Hi Mathieu
I'd like to add some more detail. I now run our app using this pattern:
LD_PRELOAD=liblttng-ust-cyg-profile.so ./app
On importing the trace into TraceCompass I see:
"null analysis for LTTng-UST CallStack"
Could the reason be the lttng commands I am using to capture UST and
Kernel e
Hi Mathieu
> > Any idea what I am doing wrong please?
>
> AFAIK, the "LD_PRELOAD" environment variable is cleared by
> sudo when running its child process for security purposes.
Thanks for your answer, that does help. However, I have now adjusted
the code so that sudo is not required, but when I
On 2025-06-02 10:37, David Aldrich via lttng-dev wrote:
Hi,
I am trying to use lttng-ust-cyg-profile.
Our application is large so, so far, I only compile main.cpp with
compiler option '-finstrument-functions' (I don't specify option
'-pg').
Our app must be run as root so I run it, and capture
Hi,
I am trying to use lttng-ust-cyg-profile.
Our application is large so, so far, I only compile main.cpp with
compiler option '-finstrument-functions' (I don't specify option
'-pg').
Our app must be run as root so I run it, and capture with lttng, like this:
lttng create app_trace
lttng enabl
