[lttng-dev] How to use the lttng-untrack command

[熊毓华]

Hi，dear




Hello, I have encountered some problems in using LTTNG, which is briefly described as follows. I am eager to get your help.


About the use of the untrack command.It is reproduced as follows:

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)




lttng create my-kernel-session --output=/tmp/my-kernel-trace
lttng add-context -k -t pid
lttng add-context -k -t tid
lttng enable-event --kernel --all
lttng untrack --kernel --pid=72598
lttng start
lttng destroy
babeltrace2 /tmp/my-kernel-trace > babeltrace.txt




Unfortunately, the output still contains the data for PID72598.
Even after I changed "lttng untrack --kernel -- PID =72598" to "LTTNG untrack-u -- PID =72598", this phenomenon still occurred.

How do I use the lttng-untrack command to achieve my goal?




Looking forward to your reply.
thanks,
yuhua

------------------
Yuhua Xiong
Lab for Internet and Security Technology
School of Computer Science and Technology
Zhejiang University
Hangzhou, 310007, P.R. China

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