lttng-enable-channel(1)
=======================
-:revdate: 3 May 2021
+:revdate: 17 May 2021
NAME
NOTE: The man:lttng-enable-event(1) command can automatically create a
default channel when no channel exists for the provided tracing domain.
+See the ``<<examples,EXAMPLES>>'' section below for usage examples.
+
List the channels of a given tracing session with the
man:lttng-list(1) and man:lttng-status(1) commands.
====
-include::common-cmd-options-head.txt[]
+include::common-lttng-cmd-options-head.txt[]
Tracing domain
+{default_metadata_switch_timer}+
-include::common-cmd-help-options.txt[]
+include::common-lttng-cmd-help-options.txt[]
+
+
+include::common-lttng-cmd-after-options.txt[]
+
+
+[[examples]]
+EXAMPLES
+--------
+.Create a Linux kernel channel with default attributes in the current tracing session.
+====
+The following command line only creates a new channel if `my-channel`
+doesn't name an existing Linux kernel channel in the current tracing
+session.
+
+[role="term"]
+----
+$ lttng enable-channel --kernel my-channel
+----
+====
+
+.Create a user space channel with a per-process buffering scheme in a specific tracing session.
+====
+See the option:--session and option:--buffers-pid options.
+
+[role="term"]
+----
+$ lttng enable-channel --session=my-session --userspace \
+ --buffers-pid my-channel
+----
+====
+
+.Create a Linux kernel channel in the current tracing session with four 32-MiB sub-buffers per ring buffer.
+====
+See the option:--num-subbuf and option:--subbuf-size options.
+
+[role="term"]
+----
+$ lttng enable-channel --kernel my-channel \
+ --num-subbuf=4 --subbuf-size=32M
+----
+====
+
+.Create a user space channel in the current tracing session with trace file rotation.
+====
+See the option:--tracefile-count and option:--tracefile-size options.
+
+[role="term"]
+----
+$ lttng enable-channel --userspace my-channel \
+ --tracefile-count=16 --tracefile-size=8M
+----
+====
+
+.Enable two user space channels of a specific tracing session.
+====
+[role="term"]
+----
+$ lttng enable-channel --session=my-session --userspace \
+ canal-d,rds
+----
+====
-include::common-cmd-footer.txt[]
+include::common-footer.txt[]
SEE ALSO
--------
man:lttng(1),
-man:lttng-concepts(7),
man:lttng-disable-channel(1),
-man:lttng-list(1)
+man:lttng-list(1),
+man:lttng-concepts(7)