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authorDu, Changbin <changbin.du@gmail.com>2014-01-23 15:54:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:36:55 -0800
commit8f073bd0d0bf7c519854a196215a837abbfbdc62 (patch)
parent578b1e0701af34f9ef69daabda4431f1e8501109 (diff)
dynamic-debug-howto.txt: update since new wildcard support
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>
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/dynamic-debug-howto.txt b/Documentation/dynamic-debug-howto.txt
index 1bbdcfcf1f13..46325eb2ea76 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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