How to show method entry/exit in Trace Compass?

How to show method entry/exit in Trace Compass?

[David Aldrich via lttng-dev]

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Hi

I'm using LTTng 2.13.11 on Ubuntu 24.04 with Trace Compass 11.3.0
on Windows, to analyse a C++ app.

I have used LTTng and Trace Compass a little to instrument our user space
app using  lttng_ust_tracef(). I now want to show actual method entry/exit
points in a Gantt type view.

With help from AI I instrumented entry/exit for one method. Babeltrace
shows that the trace files contain those points:

<time> sr1  myapp:method_entry: { cpu_id = 4 }, { class = "ThreadPool",
method = "mainLoop" }
<time> sr1 myapp:method_exit: { cpu_id = 6 }, { class = "ThreadPool",
method = "mainLoop" }

But when I import the trace into Trace Compass I see the events but the
trace shows only the app name, not the method name.

What am I missing? Is there a user guide article that would help me?

Best regards
David

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Re: How to show method entry/exit in Trace Compass?

[Matthew Khouzam via lttng-dev]

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Hi David,

I would love to look into the "lost event". Can you share the trace? maybe it's an easy win.
________________________________
From: lttng-dev <lttng-dev-bounces@lists.lttng.org> on behalf of David Aldrich via lttng-dev <lttng-dev@lists.lttng.org>
Sent: Thursday, April 30, 2026 7:01 PM
To: lttng-dev@lists.lttng.org <lttng-dev@lists.lttng.org>
Subject: How to show method entry/exit in Trace Compass?

Hi

I'm using LTTng 2.13.11 on Ubuntu 24.04 with Trace Compass 11.3.0 on Windows, to analyse a C++ app.

I have used LTTng and Trace Compass a little to instrument our user space app using  lttng_ust_tracef(). I now want to show actual method entry/exit points in a Gantt type view.

With help from AI I instrumented entry/exit for one method. Babeltrace shows that the trace files contain those points:

<time> sr1  myapp:method_entry: { cpu_id = 4 }, { class = "ThreadPool", method = "mainLoop" }
<time> sr1 myapp:method_exit: { cpu_id = 6 }, { class = "ThreadPool", method = "mainLoop" }

But when I import the trace into Trace Compass I see the events but the trace shows only the app name, not the method name.

What am I missing? Is there a user guide article that would help me?

Best regards
David

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