* [lttng-dev] How to use the lttng-untrack command
@ 2020-09-01 9:13 熊毓华
2020-09-01 13:37 ` Mathieu Desnoyers
0 siblings, 1 reply; 4+ messages in thread
From: 熊毓华 @ 2020-09-01 9:13 UTC (permalink / raw)
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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^ permalink raw reply [flat|nested] 4+ messages in thread
* [lttng-dev] How to use the lttng-untrack command
2020-09-01 9:13 [lttng-dev] How to use the lttng-untrack command 熊毓华
@ 2020-09-01 13:37 ` Mathieu Desnoyers
2020-09-03 2:53 ` 熊毓华
0 siblings, 1 reply; 4+ messages in thread
From: Mathieu Desnoyers @ 2020-09-01 13:37 UTC (permalink / raw)
----- On Sep 1, 2020, at 5:13 AM, ??? <xiongyuhua at zju.edu.cn> wrote:
> 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)
> 1. lttng create my-kernel-session --output=/tmp/my-kernel-trace
> 2. lttng add-context -k -t pid
> 3. lttng add-context -k -t tid
> 4. lttng enable-event --kernel --all
> 5. lttng untrack --kernel --pid=72598
> 6. lttng start
> 7. lttng destroy
> 8. 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?
Based on the lttng-track(1) man page:
The lttng track commands adds one or more values to a process attribute
tracker.
A process attribute tracker is an inclusion set of process attributes.
Tracked processes are allowed to emit events, provided those events are
targeted by enabled event rules (see lttng-enable-event(1)).
Tracker values can be removed from an inclusion set with lttng-
untrack(1).
What you are looking for is a an "exclusion set", which does not exist at this point
in LTTng.
Thanks,
Mathieu
> 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
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [lttng-dev] How to use the lttng-untrack command
2020-09-01 13:37 ` Mathieu Desnoyers
@ 2020-09-03 2:53 ` 熊毓华
2020-09-03 14:17 ` Mathieu Desnoyers
0 siblings, 1 reply; 4+ messages in thread
From: 熊毓华 @ 2020-09-03 2:53 UTC (permalink / raw)
Thanks?now I understand the tracking policy of lttng.
And I want to know?do you have any plans for "exclusion set"?
-----????-----
???:"Mathieu Desnoyers" <mathieu.desnoyers at efficios.com>
????:2020-09-01 21:37:40 (???)
???: "???" <xiongyuhua at zju.edu.cn>
??: lttng-dev <lttng-dev at lists.lttng.org>, "Genevi?ve Bastien" <gbastien at versatic.net>
??: Re: How to use the lttng-untrack command
----- On Sep 1, 2020, at 5:13 AM, ??? <xiongyuhua at zju.edu.cn> wrote:
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?
Based on the lttng-track(1) man page:
The lttng track commands adds one or more values to a process attribute
tracker.
A process attribute tracker is an inclusion set of process attributes.
Tracked processes are allowed to emit events, provided those events are
targeted by enabled event rules (see lttng-enable-event(1)).
Tracker values can be removed from an inclusion set with lttng-
untrack(1).
What you are looking for is a an "exclusion set", which does not exist at this point
in LTTng.
Thanks,
Mathieu
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
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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2020-09-01 9:13 [lttng-dev] How to use the lttng-untrack command 熊毓华
2020-09-01 13:37 ` Mathieu Desnoyers
2020-09-03 2:53 ` 熊毓华
2020-09-03 14:17 ` Mathieu Desnoyers
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