`N`::
A hexadecimal event descriptor which is the same format as used
- by perf-record(1): a concatenation of the event number and umask
+ by man:perf-record(1): a concatenation of the event number and umask
value provided by the processor's manufacturer. The possible values
for this field are processor-specific.
Use the option:--list option without other arguments to list the
available context field names.
+See the <<limitations,LIMITATIONS>> section below for a list of
+limitations to consider.
include::common-cmd-options-head.txt[]
include::common-cmd-help-options.txt[]
+[[limitations]]
+LIMITATIONS
+-----------
+As of this version of LTTng, it is not possible to add context fields to
+a channel once its tracing session has been started (see man:lttng-start(1))
+at least once.
include::common-cmd-footer.txt[]