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-rw-r--r--kernel/Documentation/trace/events.txt18
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/Documentation/trace/events.txt b/kernel/Documentation/trace/events.txt
index 75d25a1d6..c010be8c8 100644
--- a/kernel/Documentation/trace/events.txt
+++ b/kernel/Documentation/trace/events.txt
@@ -288,6 +288,24 @@ prev_pid == 0
# cat sched_wakeup/filter
common_pid == 0
+5.4 PID filtering
+-----------------
+
+The set_event_pid file in the same directory as the top events directory
+exists, will filter all events from tracing any task that does not have the
+PID listed in the set_event_pid file.
+
+# cd /sys/kernel/debug/tracing
+# echo $$ > set_event_pid
+# echo 1 > events/enabled
+
+Will only trace events for the current task.
+
+To add more PIDs without losing the PIDs already included, use '>>'.
+
+# echo 123 244 1 >> set_event_pid
+
+
6. Event triggers
=================