Messages in this thread | | | Date | Wed, 5 Jul 2017 16:26:40 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: perf script: Question: Python trace processing script contains the tid of the process in the common_pid attribute |
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Em Wed, Jul 05, 2017 at 04:25:45PM -0300, Arnaldo Carvalho de Melo escreveu: > Em Wed, Jul 05, 2017 at 09:22:07AM -0700, Arun Kalyanasundaram escreveu: > > Hi Arnaldo, > > > > Thank you for your reply. > > I actually meant tracepoint event handlers: def > > trace_unhandled(event_name, context, event_fields_dict) > > The dict parameter contains an attribute "common_pid" which is > > actually the "tid" of the thread. There are no other attributes that > > contain the actual pid of the process. So, I was wondering if this is > > something intentional? If not I can share a patch to fix this. > > Yeah there is a problem in: > > tools/perf/util/scripting-engines/trace-event-python.c > > static void python_process_event(union perf_event *event, > struct perf_sample *sample, > struct perf_evsel *evsel, > struct addr_location *al) > { > struct tables *tables = &tables_global; > > switch (evsel->attr.type) { > case PERF_TYPE_TRACEPOINT: > python_process_tracepoint(sample, evsel, al); > break; > /* Reserve for future process_hw/sw/raw APIs */ > default: > if (tables->db_export_mode) > db_export__sample(&tables->dbe, event, sample, evsel, al); > else > python_process_general_event(sample, evsel, al); > } > } > > The python_process_tracepoint() thing predates > python_process_general_event(), and doesn't adds the dict with all the > perf_sample entries that python_process_general_event() passes to the > python method :-\ > > Both the per-tracepoint python hooks _and_ trace_unhandled() should get > that dict, is that what your patch does?
Well, for performance reasons I think perhaps we could take a look at the signature of the python hook and provide the dictionary only if it is in it?
- Arnaldo
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