diff options
| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2015-11-03 22:37:15 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2015-11-03 22:37:15 +0100 |
| commit | 627645fdb657dfae5fcf26bbf6a6e1b63751dbc8 (patch) | |
| tree | 7c8d356aa5ba5d77def07dd5859d848c94172131 /Documentation/trace/events.txt | |
| parent | ring_buffer: Remove unneeded smp_wmb() before wakeup of reader benchmark (diff) | |
| download | linux-627645fdb657dfae5fcf26bbf6a6e1b63751dbc8.tar.xz linux-627645fdb657dfae5fcf26bbf6a6e1b63751dbc8.zip | |
tracing: Add some documentation about set_event_pid
Update Documentation to include some comments about how to use
set_event_pid.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/trace/events.txt')
| -rw-r--r-- | Documentation/trace/events.txt | 18 |
1 files changed, 18 insertions, 0 deletions
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 ================= |