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

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Add the usage of using new feature wildcard support.

Signed-off-by: Du, Changbin <changbin.du@gmail.com>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Du, Changbin 2014-01-23 15:54:15 -08:00 committed by Linus Torvalds
parent 578b1e0701
commit 8f073bd0d0
1 changed files with 9 additions and 0 deletions
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Documentation/dynamic-debug-howto.txt
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@ -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