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-rw-r--r--Documentation/trace/ftrace.txt17
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index ef621d34ba5b..db18362c14f3 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -2437,6 +2437,23 @@ 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
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