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-rw-r--r--Documentation/admin-guide/kernel-parameters.txt19
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diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index fb388c6c8c60..5a0eff3231c6 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -6266,6 +6266,25 @@
See also Documentation/trace/ftrace.rst "trace options"
section.
+ trace_trigger=[trigger-list]
+ [FTRACE] Add a event trigger on specific events.
+ Set a trigger on top of a specific event, with an optional
+ filter.
+
+ The format is is "trace_trigger=<event>.<trigger>[ if <filter>],..."
+ Where more than one trigger may be specified that are comma deliminated.
+
+ For example:
+
+ trace_trigger="sched_switch.stacktrace if prev_state == 2"
+
+ The above will enable the "stacktrace" trigger on the "sched_switch"
+ event but only trigger it if the "prev_state" of the "sched_switch"
+ event is "2" (TASK_UNINTERUPTIBLE).
+
+ See also "Event triggers" in Documentation/trace/events.rst
+
+
traceoff_on_warning
[FTRACE] enable this option to disable tracing when a
warning is hit. This turns off "tracing_on". Tracing can