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Mon, 02 Jun 2025 07:37:41 -0700 (PDT) MIME-Version: 1.0 Date: Mon, 2 Jun 2025 15:37:30 +0100 X-Gm-Features: AX0GCFu_5E78sau6pTley7BbpxoRF7i85OuKqvKRJ_NodPDNKphyHa4_h2goS2w Message-ID: Subject: Function tracing not working To: lttng-dev@lists.lttng.org Content-Type: text/plain; charset="UTF-8" X-Mailman-Approved-At: Mon, 02 Jun 2025 10:41:13 -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 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 enable-event --userspace 'lttng_ust_tracef:*' lttng enable-channel --kernel --session app_trace kernel_channel lttng enable-event --kernel --all --channel kernel_channel --session app_trace export LD_PRELOAD=liblttng-ust-cyg-profile.so lttng start sudo -E ./myapp lttng stop I notice that many events get discarded: Warning: 198522 events were discarded, please refer to the documentation on channel configuration. I then import into TraceCompass. I see the traces in the Resources View, but when I expand Experiment > Views, all 3 'LTTng-UST CallStack' entries are striked through so I can't select them. So I can't visualise the function calls. Any idea what I am doing wrong please? Best regards, David