From 8f073bd0d0bf7c519854a196215a837abbfbdc62 Mon Sep 17 00:00:00 2001 From: "Du, Changbin" Date: Thu, 23 Jan 2014 15:54:15 -0800 Subject: [PATCH] dynamic-debug-howto.txt: update since new wildcard support Add the usage of using new feature wildcard support. Signed-off-by: Du, Changbin Cc: Jason Baron Cc: Joe Perches Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 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 > /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" > /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' > /dynamic_debug/control +// enable messages in files of which the pathes include string "usb" +nullarbor:~ # echo -n '*usb* +p' > /dynamic_debug/control + // enable all messages nullarbor:~ # echo -n '+p' > /dynamic_debug/control