From: "Du, Changbin" <changbin...@gmail.com>
Add the usage of using new feature wildcard support.
Signed-off-by: Du, Changbin <changbin...@gmail.com>
---
Documentation/dynamic-debug-howto.txt | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/dynamic-debug-howto.txt
b/Documentation/dynamic-debug-howto.txt
index 1bbdcfc..46325eb 100644
--- a/Documentation/dynamic-debug-howto.txt
+++ b/Documentation/dynamic-debug-howto.txt
@@ -108,6 +108,12 @@ If your query set is big, you can batch them too:
~# cat query-batch-file > <debugfs>/dynamic_debug/control
+A another way is to use wildcard. The match rule support '*' (matches
+zero or more characters) and '?' (matches exactly one character).For
+example, you can match all usb drivers:
+
+ ~# echo "file drivers/usb/* +p" > <debugfs>/dynamic_debug/control
+
At the syntactical level, a command comprises a sequence of match
specifications, followed by a flags change specification.
@@ -315,6 +321,9 @@ nullarbor:~ # echo -n 'func svc_process -p' >
nullarbor:~ # echo -n 'format "nfsd: READ" +p' >
<debugfs>/dynamic_debug/control
+// enable messages in files of which the pathes include string "usb"
+nullarbor:~ # echo -n '*usb* +p' > <debugfs>/dynamic_debug/control
+
// enable all messages
nullarbor:~ # echo -n '+p' > <debugfs>/dynamic_debug/control
--
1.8.1.2
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