et_selector3erl
Define event transforms and trace patterns
Overview
Exports
make_pattern(RawPattern) -> TracePattern
Types:
RawPattern = detail_level()
TracePattern = erlang_trace_pattern_match_spec()
detail_level() = min | max | integer(X) when X >= 0, X =< 100
Makes a trace pattern suitable to feed change_pattern/1
Min detail level deactivates tracing of calls to et:trace_me/4,5
Max detail level activates tracing of all calls to et:trace_me/4,5
integer(X) detail level activates tracing of all calls to et:trace_me/4,5 whose detail level argument is lesser than X.
See also erlang:trace_pattern/2 for more info about its match_spec()
change_pattern(Pattern) -> ok
Types:
Pattern = detail_level() | empty_match_spec() | erlang_trace_pattern_match_spec()
detail_level() = min | max | integer(X) when X >= 0, X =< 100
empty_match_spec() = []
Activates/deactivates tracing by changing the current trace pattern.
min detail level deactivates tracing of calls to et:trace_me/4,5
max detail level activates tracing of all calls to et:trace_me/4,5
integer(X) detail level activates tracing of all calls to et:trace_me/4,5 whose detail level argument is lesser than X.
An empty match spec deactivates tracing of calls to et:trace_me/4,5
Other match specs activates tracing of calls to et:trace_me/4,5 accordingly with erlang:trace_pattern/2.
parse_event(Mod, ValidTraceData) -> false | true | {true, Event}
Types:
Mod = module_name() | undefined
module_name() = atom()
ValidTraceData = erlang_trace_data() | record(event)
erlang_trace_data() = {trace, Pid, Label, Info} | {trace, Pid, Label, Info, Extra} | {trace_ts, Pid, Label, Info, ReportedTS} | {trace_ts, Pid, Label, Info, Extra, ReportedTS} | {seq_trace, Label, Info} | {seq_trace, Label, Info, ReportedTS} | {drop, NumberOfDroppedItems}
Transforms trace data and makes an event record out of it.
See erlang:trace/3 for more info about the semantics of the trace data.
An event record consists of the following fields:
|
Noise has a high level as opposed to essentials. |
|---|---|
|
Time when the trace was generated. Same as event_ts if omitted in trace data. |
|
Time when the event record was created. |
|
From actor, such as sender of a message. |
|
To actor, such as receiver of message. |
|
Label intended to provide a brief event summary. |
|
All nitty gritty details of the event. |
See et:trace_me/4and et:trace_me/5 for details.
Returns:
- {true, Event}:
-
where Event is an #event{} record representing the trace data
true:-
means that the trace data already is an event record and that it is valid as it is. No transformation is needed.
false:-
means that the trace data is uninteresting and should be dropped
Releases
10 releases since Debian 3.1 (Sarge); the text changed 8 times.