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-rw-r--r--Documentation/trace/ftrace.txt23
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index ef621d34b..f52f297cb 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -204,6 +204,12 @@ of ftrace. Here is a list of some of the key files:
Have the function tracer only trace a single thread.
+ set_event_pid:
+
+ Have the events only trace a task with a PID listed in this file.
+ Note, sched_switch and sched_wake_up will also trace events
+ listed in this file.
+
set_graph_function:
Set a "trigger" function where tracing should start
@@ -2437,6 +2443,23 @@ The following commands are supported:
echo '!writeback*:mod:ext3' >> set_ftrace_filter
+ Mod command supports module globbing. Disable tracing for all
+ functions except a specific module:
+
+ echo '!*:mod:!ext3' >> set_ftrace_filter
+
+ Disable tracing for all modules, but still trace kernel:
+
+ echo '!*:mod:*' >> set_ftrace_filter
+
+ Enable filter only for kernel:
+
+ echo '*write*:mod:!*' >> set_ftrace_filter
+
+ Enable filter for module globbing:
+
+ echo '*write*:mod:*snd*' >> set_ftrace_filter
+
- traceon/traceoff
These commands turn tracing on and off when the specified
functions are hit. The parameter determines how many times the