From: "熊毓华 via lttng-dev" <lttng-dev@lists.lttng.org>
To: "Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>
Cc: lttng-dev <lttng-dev@lists.lttng.org>
Subject: Re: [lttng-dev] How to use the lttng-untrack command
Date: Thu, 3 Sep 2020 10:53:32 +0800 (GMT+08:00) [thread overview]
Message-ID: <5ceed60f.1d021.17451e23278.Coremail.xiongyuhua@zju.edu.cn> (raw)
In-Reply-To: <1835947492.25584.1598967460978.JavaMail.zimbra@efficios.com>
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Thanks,now I understand the tracking policy of lttng.
And I want to know,do you have any plans for "exclusion set"?
-----原始邮件-----
发件人:"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>
发送时间:2020-09-01 21:37:40 (星期二)
收件人: "熊毓华" <xiongyuhua@zju.edu.cn>
抄送: lttng-dev <lttng-dev@lists.lttng.org>, "Geneviève Bastien" <gbastien@versatic.net>
主题: Re: How to use the lttng-untrack command
----- On Sep 1, 2020, at 5:13 AM, 熊毓华 <xiongyuhua@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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next prev parent reply other threads:[~2020-09-03 12:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-01 9:13 [lttng-dev] How to use the lttng-untrack command 熊毓华 via lttng-dev
2020-09-01 13:37 ` Mathieu Desnoyers via lttng-dev
2020-09-03 2:53 ` 熊毓华 via lttng-dev [this message]
2020-09-03 14:17 ` Mathieu Desnoyers via lttng-dev
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