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LTTNG-UNTRACK(1) LTTng Manual LTTNG-UNTRACK(1)
lttng-untrack - Remove one or more entries from an LTTng resource
tracker
lttng [GENERAL OPTIONS] untrack (--kernel | --userspace)
[--session=SESSION] (--pid=PID[,PID]... | --all --pid)
The lttng untrack commands removes one or more entries from a
resource tracker.
See lttng-track(1) to learn more about LTTng trackers.
The untrack command removes specific resources from a tracker. The
resources to remove must have been precedently added by
lttng-track(1). It is also possible to remove all the resources from
the whitelist using the --all option.
As of this version, the only available tracker is the PID tracker.
Example
One common operation is to create a tracing session (see
lttng-create(1)), remove all the entries from the PID tracker
whitelist, start tracing, and then manually track PIDs while tracing
is active.
Assume the maximum system PID is 7 for this example.
Command:
$ lttng create
Initial whitelist:
[0] [1] [2] [3] [4] [5] [6] [7]
Command:
$ lttng untrack --userspace --pid --all
Whitelist:
[ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ]
Commands:
$ lttng enable-event --userspace ...
$ lttng start
$ # ...
$ lttng track --userspace --pid=3,5
Whitelist:
[ ] [ ] [ ] [3] [ ] [5] [ ] [ ]
Command:
$ lttng track --userspace --pid=2
Whitelist:
[ ] [ ] [2] [3] [ ] [5] [ ] [ ]
General options are described in lttng(1).
Domain
One of:
-k, --kernel
Untrack resources tracked in the Linux kernel domain.
-u, --userspace
Untrack resources tracked in the user space domain.
Target
-s, --session=SESSION
Untrack resources in the tracing session named SESSION instead of
the current tracing session.
Untracking
-a, --all
Used in conjunction with an empty --pid option: untrack all
process IDs (clear the whitelist).
-p [PID[,PID]...], --pid[=PID[,PID]...]
Untrack process IDs PID (remove them from the current whitelist).
The PID argument must be omitted when also using the --all
option.
Program information
-h, --help
Show command help.
This option, like lttng-help(1), attempts to launch /usr/bin/man
to view the command’s man page. The path to the man pager can be
overridden by the LTTNG_MAN_BIN_PATH environment variable.
--list-options
List available command options.
LTTNG_ABORT_ON_ERROR
Set to 1 to abort the process after the first error is
encountered.
LTTNG_HOME
Overrides the $HOME environment variable. Useful when the user
running the commands has a non-writable home directory.
LTTNG_MAN_BIN_PATH
Absolute path to the man pager to use for viewing help
information about LTTng commands (using lttng-help(1) or lttng
COMMAND --help).
LTTNG_SESSION_CONFIG_XSD_PATH
Path in which the session.xsd session configuration XML schema
may be found.
LTTNG_SESSIOND_PATH
Full session daemon binary path.
The --sessiond-path option has precedence over this environment
variable.
Note that the lttng-create(1) command can spawn an LTTng session
daemon automatically if none is running. See lttng-sessiond(8) for
the environment variables influencing the execution of the session
daemon.
$LTTNG_HOME/.lttngrc
User LTTng runtime configuration.
This is where the per-user current tracing session is stored
between executions of lttng(1). The current tracing session can
be set with lttng-set-session(1). See lttng-create(1) for more
information about tracing sessions.
$LTTNG_HOME/lttng-traces
Default output directory of LTTng traces. This can be overridden
with the --output option of the lttng-create(1) command.
$LTTNG_HOME/.lttng
User LTTng runtime and configuration directory.
$LTTNG_HOME/.lttng/sessions
Default location of saved user tracing sessions (see
lttng-save(1) and lttng-load(1)).
/usr/local/etc/lttng/sessions
System-wide location of saved tracing sessions (see lttng-save(1)
and lttng-load(1)).
Note
$LTTNG_HOME defaults to $HOME when not explicitly set.
0
Success
1
Command error
2
Undefined command
3
Fatal error
4
Command warning (something went wrong during the command)
If you encounter any issue or usability problem, please report it on
the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-tools>.
· LTTng project website <http://lttng.org>
· LTTng documentation <http://lttng.org/docs>
· Git repositories <http://git.lttng.org>
· GitHub organization <http://github.com/lttng>
· Continuous integration <http://ci.lttng.org/>
· Mailing list <http://lists.lttng.org> for support and
development: lttng-dev@lists.lttng.org
· IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net
This program is part of the LTTng-tools project.
LTTng-tools is distributed under the GNU General Public License
version 2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html>.
See the LICENSE <https://github.com/lttng/lttng-
tools/blob/master/LICENSE> file for details.
Special thanks to Michel Dagenais and the DORSAL laboratory
<http://www.dorsal.polymtl.ca/> at École Polytechnique de Montréal
for the LTTng journey.
Also thanks to the Ericsson teams working on tracing which helped us
greatly with detailed bug reports and unusual test cases.
LTTng-tools was originally written by Mathieu Desnoyers, Julien
Desfossez, and David Goulet. More people have since contributed to
it.
LTTng-tools is currently maintained by Jérémie Galarneau
<mailto:jeremie.galarneau@efficios.com>.
lttng-track(1), lttng(1)
This page is part of the LTTng-Tools ( LTTng tools) project.
Information about the project can be found at ⟨http://lttng.org/⟩.
It is not known how to report bugs for this man page; if you know,
please send a mail to man-pages@man7.org. This page was obtained
from the project's upstream Git repository
⟨git://git.lttng.org/lttng-tools.git⟩ on 2018-02-02. (At that time,
the date of the most recent commit that was found in the repository
was 2018-02-01.) If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-to-
date source for the page, or you have corrections or improvements to
the information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
LTTng 2.11.0-pre 02/02/2018 LTTNG-UNTRACK(1)
Pages that refer to this page: lttng(1), lttng-track(1)
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