lttng-enable-rotation(1)
========================
-:revdate: 21 April 2021
+:revdate: 17 May 2021
NAME
----
-lttng-enable-rotation - Set a tracing session rotation schedule
+lttng-enable-rotation - Set an LTTng tracing session rotation schedule
SYNOPSIS
The tracing session named 'SESSION'.
Without the option:--session option::
- The current tracing session (see man:lttng-create(1) and
- man:lttng-set-session(1) to learn more about the current tracing
- session).
+ The current tracing session (see man:lttng-concepts(7) to learn more
+ about the current tracing session).
-See man:lttng-rotate(1) for more information about the concepts of a
-tracing session _rotation_ and a _trace chunk_.
+See man:lttng-concepts(7) to learn more about the tracing session
+rotation and trace chunk concepts.
With the option:--timer='PERIODUS' option, the `enable-rotation` command
sets a rotation schedule so that LTTng performs an automatic rotation at
For both the option:--timer and option:--size options, LTTng checks the
schedule condition periodically using the monitor timers of the channels
of the selected tracing session (see the nloption:--monitor-timer option
-of man:lttng-enable-channel(1)). This means that:
+of the man:lttng-enable-channel(1) command). This means that:
* With the option:--timer='PERIODUS' option, LTTng can perform an
automatic rotation when the elapsed time since the last automatic
You may combine the option:--timer and option:--size options.
-The naming convention of a trace chunk archive which an automatic
-rotation operation creates is the same as with the immediate rotation
-command, man:lttng-rotate(1).
+See the man:lttng-concepts(7) to learn how LTTng names a trace chunk
+archive directory.
+
+See the <<examples,EXAMPLES>> section below for usage examples.
Unset a tracing session rotation schedule with the
man:lttng-disable-rotation(1) command.
[IMPORTANT]
====
-The `enable-rotation` command only works when:
+You may only use the `enable-rotation` command when:
* The selected tracing session was created in normal mode or in network
streaming mode (see man:lttng-create(1)).
* No channel was created with a configured trace file count or size
limit (see the nloption:--tracefile-size and
- nloption:--tracefile-count options of man:lttng-enable-channel(1)).
+ nloption:--tracefile-count options of the man:lttng-enable-channel(1)
+ command).
For a given tracing session, LTTng only performs an automatic rotation
-when no other rotation is currently happening.
+when it's not currently performing a rotation.
====
-include::common-cmd-options-head.txt[]
+include::common-lttng-cmd-options-head.txt[]
Rotation schedule condition
supported.
option:--timer='PERIODUS'::
- Set a rotation schedule so that LTTng performs an automatic rotation at
- least every 'PERIODUS' microseconds.
+ Set a rotation schedule so that LTTng performs an automatic rotation
+ approximately every 'PERIODUS' microseconds.
+
The `ms`{nbsp}(milliseconds), `s`{nbsp}(seconds), `m`{nbsp}(minutes),
and `h`{nbsp}(hours) suffixes are supported.
instead of the current tracing session.
-include::common-cmd-help-options.txt[]
+include::common-lttng-cmd-help-options.txt[]
+
+
+include::common-lttng-cmd-after-options.txt[]
+
+
+[[examples]]
+EXAMPLES
+--------
+.Set the size-based rotation schedule of the current tracing session.
+====
+See the option:--size option.
+
+[role="term"]
+----
+$ lttng disable-rotation --size=256M
+----
+====
+
+.Set the periodic rotation schedule of a specific tracing session.
+====
+See the option:--timer and option:--session options.
+
+[role="term"]
+----
+$ lttng disable-rotation --session=my-session --timer=5m
+----
+====
-include::common-cmd-footer.txt[]
+include::common-footer.txt[]
SEE ALSO
man:lttng(1),
man:lttng-create(1),
man:lttng-disable-rotation(1),
-man:lttng-rotate(1)
+man:lttng-rotate(1),
+man:lttng-concepts(7)