Commit 8f073bd0 authored by Du, Changbin's avatar Du, Changbin Committed by Linus Torvalds
Browse files

dynamic-debug-howto.txt: update since new wildcard support

Add the usage of using new feature wildcard support.

Signed-off-by: default avatarDu, Changbin <>
Cc: Jason Baron <>
Cc: Joe Perches <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 578b1e07
......@@ -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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