lttng-untrack(1) — Linux manual page

LTTNG-UNTRACK(1)              LTTng Manual              LTTNG-UNTRACK(1)

NAME

       lttng-untrack - Remove one or more entries from an LTTng resource
       tracker

SYNOPSIS

       lttng [GENERAL OPTIONS] untrack (--kernel | --userspace)
             [--session=SESSION] (--pid=PID[,PID]... | --all --pid)

DESCRIPTION

       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] [ ] [ ]

OPTIONS

       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.

ENVIRONMENT VARIABLES

       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.

FILES

       $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.

EXIT STATUS

       0
           Success

       1
           Command error

       2
           Undefined command

       3
           Fatal error

       4
           Command warning (something went wrong during the command)

BUGS

       If you encounter any issue or usability problem, please report it
       on the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-
       tools>.

RESOURCES

       •   LTTng project website <https://lttng.org>

       •   LTTng documentation <https://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

COPYRIGHTS

       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.

THANKS

       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.

AUTHORS

       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>.

SEE ALSO

       lttng-track(1), lttng(1)

COLOPHON

       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 2019-11-19.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2019-11-14.)  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 2.12.0-pre               10/29/2018               LTTNG-UNTRACK(1)

Pages that refer to this page: lttng(1), lttng-track(1)

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