X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-linux.git;a=blobdiff_plain;f=Documentation%2Ftrace%2Fevents.txt;h=c010be8c85d7668547459badcc964e822b494e30;hp=75d25a1d6e42e7ba96677a40b336b2091e489b2e;hb=3706492a32d8042e039220dcf7d45d6f54ad28fa;hpb=a486f183daf1e6c56c41740d95815b9ee19fcb47

diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
index 75d25a1d6e42..c010be8c85d7 100644
--- a/Documentation/trace/events.txt
+++ b/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
 =================