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| author | Du, Changbin <changbin.du@gmail.com> | 2014-01-23 15:54:15 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-23 16:36:55 -0800 |
| commit | 8f073bd0d0bf7c519854a196215a837abbfbdc62 (patch) | |
| tree | 1a5df6814fbecee7ce157c754d264010602804d1 /Documentation/dynamic-debug-howto.txt | |
| parent | 578b1e0701af34f9ef69daabda4431f1e8501109 (diff) | |
| download | lwn-8f073bd0d0bf7c519854a196215a837abbfbdc62.tar.gz lwn-8f073bd0d0bf7c519854a196215a837abbfbdc62.zip | |
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>
Diffstat (limited to 'Documentation/dynamic-debug-howto.txt')
| -rw-r--r-- | Documentation/dynamic-debug-howto.txt | 9 |
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' > <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 |