The mod command went in as commit
64e7c440618998fd69eee6ab490b042d12248021
The traceon/traceoff commands when in as commit
23b4ff3aa479c9e3bb23cb6b2d0a97878399784a
Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
---
Documentation/trace/ftrace.txt | 35 +++++++++++++++++++++++++++++++++++
1 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index 03485bf..64e08d5 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -155,6 +155,9 @@ of ftrace. Here is a list of some of the key files:
to be traced. Echoing names of functions into this file
will limit the trace to only those functions.
+ This interface also allows for commands to be used. See the
+ "Filter commands" section for more details.
+
set_ftrace_notrace:
This has an effect opposite to that of
@@ -1822,6 +1825,38 @@ this special filter via:
echo > set_graph_function
+Filter commands
+---------------
+
+A few commands are supported by the set_ftrace_filter interface.
+Trace commands have the following format:
+
+<function>:<command>:<parameter>
+
+The following commands are supported:
+
+- mod
+ This command enables function filtering per module. The
+ parameter defines the module. For example, if only the write*
+ functions in the ext3 module are useful in a trace, echo
+ 'write*:mod:ext3' > set_ftrace_filter. This command interacts
+ with the filter in the same way as filtering based on function
+ names. Thus, adding more functions in a different module is
+ accomplished by appending (>>) to the filter file. Remove
+ specific module functions by prepending '!'
+ (!writeback*:mod:ext3).
+
+- traceon/traceoff
+ These commands turn tracing on and off when the specified
+ functions are hit. The parameter determines how many times the
+ tracing system is turned on and off. If unspecified, there is
+ no limit. For example, to disable tracing when a schedule bug
+ is hit the first 5 times, use '__schedule_bug:traceoff:5'.
+ These commands are cumulative whether or not they are appended
+ to set_ftrace_filter. To remove a command, prepend it by '!'
+ and drop the parameter (!__schedule_bug:traceoff).
+
+
trace_pipe
----------
--
1.7.0
--
