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<p class="MsoNormal">It might be related to the static linking of lttng-ust<br>
<a href="https://lists.lttng.org/pipermail/lttng-dev/2018-January/027705.html">https://lists.lttng.org/pipermail/lttng-dev/2018-January/027705.html</a><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">I also went down that path just to figure it’s not supported.<o:p></o:p></p>
<p class="MsoNormal">Perhaps lttng documentation should be updated to make a clear note static linking is not supported (or maybe I missed it)<br>
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<o:p></o:p></p>
<p class="MsoNormal">Yehuda <br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm on an embedded platform, i.MX8 using Lttng 2.11 with 5.6.69 kernel.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Tracing kernel events with lttng works fine but userspace (tracef and trace provider type tracing) appears to have an issue I can't figure out.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">systemd is starting up my application ( a bunch of processes and threads on multiple cpu's) on boot.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm statically compiling and linking in lttng-ust. If I use just tracef type tracing, when I do lttng list --userspace I get nothing. If I add in a trace provider and a tracepoint, then I see my trace provider tracepoint and:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New";color:black;background:white"> lttng_ust_tracelog:TRACE_DEBUG (loglevel: TRACE_DEBUG (14)) (type: tracepoint)
</span><span style="font-family:"Courier New""><br>
lttng_ust_tracelog:TRACE_DEBUG_LINE (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_DEBUG_FUNCTION (loglevel: TRACE_DEBUG_FUNCTION (12)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_DEBUG_UNIT (loglevel: TRACE_DEBUG_UNIT (11)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_DEBUG_MODULE (loglevel: TRACE_DEBUG_MODULE (10)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_DEBUG_PROCESS (loglevel: TRACE_DEBUG_PROCESS (9)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_DEBUG_PROGRAM (loglevel: TRACE_DEBUG_PROGRAM (8)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_DEBUG_SYSTEM (loglevel: TRACE_DEBUG_SYSTEM (7)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_INFO (loglevel: TRACE_INFO (6)) (type: tracepoint) <br>
lttng_ust_tracelog:TRACE_NOTICE (loglevel: TRACE_NOTICE (5)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_WARNING (loglevel: TRACE_WARNING (4)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_ERR (loglevel: TRACE_ERR (3)) (type: tracepoint) <br>
lttng_ust_tracelog:TRACE_CRIT (loglevel: TRACE_CRIT (2)) (type: tracepoint) <br>
lttng_ust_tracelog:TRACE_ALERT (loglevel: TRACE_ALERT (1)) (type: tracepoint)
<br>
lttng_ust_tracelog:TRACE_EMERG (loglevel: TRACE_EMERG (0)) (type: tracepoint)
<br>
lttng_ust_tracef:event (loglevel: TRACE_DEBUG (14)) (type: tracepoint) <br>
lttng_ust_lib:unload (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint) <br>
lttng_ust_lib:debug_link (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)
<br>
lttng_ust_lib:build_id (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint) <br>
lttng_ust_lib:load (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint) <br>
lttng_ust_statedump:end (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)
<br>
lttng_ust_statedump:debug_link (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)
<br>
lttng_ust_statedump:build_id (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)
<br>
lttng_ust_statedump:bin_info (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)
<br>
lttng_ust_statedump:start (loglevel: TRACE_DEBUG_LINE (13)) (type: tracepoint)</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">When I do lttng start, I get a directory structure in the trace directory but the file sizes do not ever increase. It's just a directory structure with files created and then that's it, no events
being written to the files. At first I thought things just weren't linked in right and not working but then discovered how to run lttng-sessiond in -vvv mode and then could see lots of things are going on, tracing appears to be trying to work as there is
tons of activity being output by lttng-sessiond, but like I said the trace files aren't being added to.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">I looked at the lttng-sessiond log I captured and can't quite make out the problem so attaching it.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">I'm probably not doing something right but can't figure out what that is so any pointers appreciated.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Regards,</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Brian</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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