<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div><br data-mce-bogus="1"></div><div><span id="zwchr" data-marker="__DIVIDER__">----- On Sep 1, 2020, at 5:13 AM, 熊毓华 <xiongyuhua@zju.edu.cn> wrote:<br></span></div><div data-marker="__QUOTED_TEXT__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><p>
Hi，dear
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Hello, I have encountered some problems in using LTTNG, which is briefly described as follows. I am eager to get your help.
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About the use of the untrack command.It is reproduced as follows:
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I type the following commands in turn to start LTTNG, and set up not to monitor a particular process.(For example, I input the "top" command in the terminal, the PID of the "top" process is 72598, now I want LTTNG not to monitor the "top" process)
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<ol><li>
lttng create my-kernel-session --output=/tmp/my-kernel-trace
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lttng add-context -k -t pid
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<span style="white-space:normal">lttng add-context -k -t tid</span>
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lttng enable-event --kernel --all
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lttng untrack --kernel --pid=72598
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lttng start
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lttng destroy
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babeltrace2 /tmp/my-kernel-trace > babeltrace.txt
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Unfortunately, the output still contains the data for PID72598.<br>
Even after I changed "lttng untrack --kernel -- PID =72598" to "LTTNG untrack-u -- PID =72598", this phenomenon still occurred.<br>
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How do I use the lttng-untrack command to achieve my goal?
</p></blockquote><div><br></div><div>Based on the lttng-track(1) man page:<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div> The lttng track commands adds one or more values to a process attribute<br> tracker.<br><br> A process attribute tracker is an inclusion set of process attributes.<br> Tracked processes are allowed to emit events, provided those events are<br> targeted by enabled event rules (see lttng-enable-event(1)).<br><br> Tracker values can be removed from an inclusion set with lttng-<br> untrack(1).<br><br data-mce-bogus="1"></div><div>What you are looking for is a an "exclusion set", which does not exist at this point<br data-mce-bogus="1"></div><div>in LTTng.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Thanks,<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Mathieu<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;">
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Looking forward to your reply.<br>
thanks,<br>
yuhua
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------------------<br>
Yuhua Xiong<br>
Lab for Internet and Security Technology<br>
School of Computer Science and Technology<br>
Zhejiang University<br>
Hangzhou, 310007, P.R. China<br>
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</p><br></blockquote></div><div><br></div><div data-marker="__SIG_POST__">-- <br></div><div>Mathieu Desnoyers<br>EfficiOS Inc.<br>http://www.efficios.com</div></div></body></html>