удалите одну или несколько записей из трекера ресурсов LTTng (Remove one or more entries from an LTTng resource tracker)
Имя (Name)
lttng-untrack - Remove one or more entries from an LTTng resource
tracker
Синопсис (Synopsis)
lttng [GENERAL OPTIONS] untrack (--kernel | --userspace)
[--session=SESSION] (--pid=PID[,PID]... | --all --pid)
Описание (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] [ ] [ ]
Параметры (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.
Переменные окружения (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.
Файлы (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.
Статус выхода (Exit)
0
Success
1
Command error
2
Undefined command
3
Fatal error
4
Command warning (something went wrong during the command)
Ошибки (баги) (Bugs)
If you encounter any issue or usability problem, please report it
on the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-
tools>.
Ресурсы (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
