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Wed, 07 May 2025 09:50:43 -0700 (PDT) MIME-Version: 1.0 Date: Wed, 7 May 2025 17:50:33 +0100 X-Gm-Features: ATxdqUFiuKZQeTWJpeMTRUCGfQYXSr_kFSrw3qBdVQdGJDbfQ17gTd2Iamp9BzA Message-ID: Subject: Not capturing ust events To: lttng-dev@lists.lttng.org Content-Type: text/plain; charset="UTF-8" X-Mailman-Approved-At: Wed, 07 May 2025 17:09:10 -0400 X-BeenThere: lttng-dev@lists.lttng.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: LTTng development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: David Aldrich via lttng-dev Reply-To: David Aldrich Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" Hi I am just getting started with LTTng. I am trying to use lttng_ust_tracef() initially. I am running LTTng version 2.13 on Ubuntu 24.04 LTS, and viewing using TraceCompass 10.3.0 on Windows 11. I use lttng_ust_tracef() in just one source file: #include { int my_integer = 0; string my_string = "Normal"; lttng_ust_tracef("TaskManager: %d (%s)", my_integer, my_string.c_str()); } I build with CMake and link to the lttng-ust library: target_link_libraries(${_lib_name} lttng-ust) On the target I created a session and enabled the event: $ lttng create my_proj $ lttng enable-event --userspace 'lttng_ust_tracef:*' I have to run the application as root: sudo -E lttng-record-trace -a ./my_app When I import the trace directory into TraceCompass I tick both the kernel and ust event boxes, and create an experiment, but then only 'kernel' shows under the experiments and Traces in the tree view, no ust branch is shown. I guess this isn't much to go on, but if anyone has any ideas why it's not capturing ust events, I would be grateful. Finally, which 'event_type' should I search for in the event viewer for lttng_ust_tracef events? Best regards David