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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2013-06-17 10:59:17 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-06-19 23:32:06 -0400 |
| commit | c3e13c7c0605677a2c94957b39157f4501cea9a8 (patch) | |
| tree | cff1b8e71ea263b161e296a08598cc34d831b80a /Documentation/trace | |
| parent | 1a891cf19cdfb645827969cc6aeaeebdefeb87b2 (diff) | |
| download | lwn-c3e13c7c0605677a2c94957b39157f4501cea9a8.tar.gz lwn-c3e13c7c0605677a2c94957b39157f4501cea9a8.zip | |
tracing: Update documentation on tracepoint glob matching
b0f1a59a "tracing/filters: Use a different op for glob match" added
glob matching to tracepoint filter strings. It uses the ftrace function
tracing glob matching facility that allows for the wild card character (*)
to be used at the start and/or end of the matching string.
But the documentation still states that the filtering only allows for
exact string matches.
Cc: Li Zefan <lizefan@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/events.txt | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt index 41911240c65c..37732a220d33 100644 --- a/Documentation/trace/events.txt +++ b/Documentation/trace/events.txt @@ -187,9 +187,18 @@ The operators available for numeric fields are: And for string fields they are: -==, != +==, !=, ~ -Currently, only exact string matches are supported. +The glob (~) only accepts a wild card character (*) at the start and or +end of the string. For example: + + prev_comm ~ "*sh" + prev_comm ~ "sh*" + prev_comm ~ "*sh*" + +But does not allow for it to be within the string: + + prev_comm ~ "ba*sh" <-- is invalid 5.2 Setting filters ------------------- |