[PATCH v4 2/2] dynamic-debug-howto.txt: update since new wildcard support

From: Du, Changbin
Date: Wed Oct 30 2013 - 10:24:13 EST

From: "Du, Changbin" <changbin.du@xxxxxxxxx>

Add the usage of using new feature wildcard support.

Signed-off-by: Du, Changbin <changbin.du@xxxxxxxxx>
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' >

+// 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


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