linux-kernel - Re: [PATCH v5 3/5] perf script/python: Pass event/thread/dso name and symbol info to event handler in python

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Date:	Thu, 09 Aug 2012 10:06:02 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Feng Tang <feng.tang@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Robert Richter <robert.richter@....com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v5 3/5] perf script/python: Pass event/thread/dso name and symbol info to event handler in python

On Wed,  8 Aug 2012 17:57:53 +0800, Feng Tang wrote:
> Also as suggested by Arnaldo, pack all these parameters to a dictionary,
> which is more expandable for adding new parameters while keeping the
> compatibility for old scripts.
>
Just minor nits.


> Signed-off-by: Feng Tang <feng.tang@...el.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Robert Richter <robert.richter@....com>
> Cc: Andi Kleen <andi@...stfloor.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> ---
>  .../util/scripting-engines/trace-event-python.c    |   35 ++++++++++++++++---
>  1 files changed, 29 insertions(+), 6 deletions(-)
>
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> index 24711b3..7e3f576 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -345,15 +345,23 @@ static void python_process_general_event(union perf_event *perf_event __unused,
>  					 struct machine *machine __unused,
>  					 struct addr_location *al __unused)

@al is used now.


>  {
> -	PyObject *handler, *retval, *t;
> +	PyObject *handler, *retval, *t, *dict;
>  	static char handler_name[64];
>  	unsigned n = 0;
> -	void *data = sample->raw_data;
> +	struct thread *thread = al->thread;
>  
> +	/*
> +	 * Use the MAX_FIELDS to make the function expandable, though
> +	 * currently there is only one itme for the tuple.

s/itme/item/

Thanks,
Namhyung


> +	 */
>  	t = PyTuple_New(MAX_FIELDS);
>  	if (!t)
>  		Py_FatalError("couldn't create Python tuple");
>  
> +	dict = PyDict_New();
> +	if (!dict)
> +		Py_FatalError("couldn't create Python dictionary");
> +
>  	snprintf(handler_name, sizeof(handler_name), "%s", "process_event");
>  
>  	handler = PyDict_GetItemString(main_dict, handler_name);
> @@ -362,11 +370,25 @@ static void python_process_general_event(union perf_event *perf_event __unused,
>  		goto exit;
>  	}
>  
> -	/* Pass 4 parameters: event_attr, perf_sample, raw data, thread name */
> -	PyTuple_SetItem(t, n++, PyString_FromStringAndSize((void *)&evsel->attr, sizeof(evsel->attr)));
> -	PyTuple_SetItem(t, n++, PyString_FromStringAndSize((void *)sample, sizeof(*sample)));
> -	PyTuple_SetItem(t, n++, PyString_FromStringAndSize(data, sample->raw_size));
> +	PyDict_SetItemString(dict, "ev_name", PyString_FromString(perf_evsel__name(evsel)));
> +	PyDict_SetItemString(dict, "attr", PyString_FromStringAndSize(
> +			(const char *)&evsel->attr, sizeof(evsel->attr)));
> +	PyDict_SetItemString(dict, "sample", PyString_FromStringAndSize(
> +			(const char *)sample, sizeof(*sample)));
> +	PyDict_SetItemString(dict, "raw_buf", PyString_FromStringAndSize(
> +			(const char *)sample->raw_data, sample->raw_size));
> +	PyDict_SetItemString(dict, "comm",
> +			PyString_FromString(thread->comm));
> +	if (al->map) {
> +		PyDict_SetItemString(dict, "dso",
> +			PyString_FromString(al->map->dso->name));
> +	}
> +	if (al->sym) {
> +		PyDict_SetItemString(dict, "symbol",
> +			PyString_FromString(al->sym->name));
> +	}
>  
> +	PyTuple_SetItem(t, n++, dict);
>  	if (_PyTuple_Resize(&t, n) == -1)
>  		Py_FatalError("error resizing Python tuple");
>  
> @@ -374,6 +396,7 @@ static void python_process_general_event(union perf_event *perf_event __unused,
>  	if (retval == NULL)
>  		handler_call_die(handler_name);
>  exit:
> +	Py_DECREF(dict);
>  	Py_DECREF(t);
>  }
--
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