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tracing: Update documentation on tracepoint glob matching

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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>
This commit is contained in:
Steven Rostedt (Red Hat) 2013-06-17 10:59:17 -04:00 committed by Steven Rostedt
parent 1a891cf19c
commit c3e13c7c06
1 changed files with 11 additions and 2 deletions
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13
Documentation/trace/events.txt
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@ -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
-------------------