linux-kernel - Re: [PATCH 1/3] perf script: Add general python handler to process non-tracepoint events

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Date:	Thu, 17 May 2012 12:43:15 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Feng Tang <feng.tang@...el.com>
Cc:	mingo@...e.hu, a.p.zijlstra@...llo.nl, robert.richter@....com,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] perf script: Add general python handler to process
 non-tracepoint events

Em Wed, May 16, 2012 at 08:59:13PM +0800, Feng Tang escreveu:
> This patch just follows Robert Richter's idea and the commit 37a058ea0
> 	"perf script: Add generic perl handler to process events"
> to similarly add a python handler for general events other than tracepoints.
> 
> For non-tracepoint events, this patch will try to find a function named
> "process_general_event" in the python script, and pass the event

But in perl isn't it named "process_event"? Can't we use the same
convention in the python case?

> header, attribute, perf_sample, raw_data in format of raw string. And
> the python script can use "struct" module's unpack function to disasemble
> the needed info and process.
> 
> Signed-off-by: Feng Tang <feng.tang@...el.com>
> ---
>  .../util/scripting-engines/trace-event-python.c    |   60 +++++++++++++++++++-
>  1 files changed, 59 insertions(+), 1 deletions(-)
> 
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> index c2623c6..aaf2679 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -324,6 +325,63 @@ static void python_process_event(union perf_event *pevent __unused,
>  	Py_DECREF(t);
>  }
>  
> +static void python_process_general_event(union perf_event *pevent __unused,
> +				 struct perf_sample *sample,
> +				 struct perf_evsel *evsel __unused,
> +				 struct machine *machine __unused,
> +				 struct thread *thread __unused)
> +{
> +	PyObject *handler, *retval, *t;
> +	static char handler_name[64];
> +	unsigned n = 0;
> +	void *data = sample->raw_data;
> +
> +	t = PyTuple_New(MAX_FIELDS);
> +	if (!t)
> +		Py_FatalError("couldn't create Python tuple");
> +
> +	sprintf(handler_name, "process_general_event");

Strange use of sprintf, if you think it is safe to not bounds check, use
strcpy(), if you still want to use sprintf, please instead use:

	snprintf(handler_name, sizeof(handler_name), "%s", "process_event");

> +	handler = PyDict_GetItemString(main_dict, handler_name);
> +	if (handler && !PyCallable_Check(handler)) {
> +		handler = NULL;
> +		goto exit;
> +	}
> +
> +	/* Pass 3 parameters: event_attr, perf_sample, raw data */
> +	PyTuple_SetItem(t, n++, PyString_FromStringAndSize(
> +			(const char *)&evsel->attr, sizeof(evsel->attr)));
> +	PyTuple_SetItem(t, n++, PyString_FromStringAndSize(
> +			(const char *)sample, sizeof(*sample)));
> +	PyTuple_SetItem(t, n++, PyString_FromStringAndSize(
> +			data, sample->raw_size));
> +
> +	if (_PyTuple_Resize(&t, n) == -1)
> +		Py_FatalError("error resizing Python tuple");
> +
> +	retval = PyObject_CallObject(handler, t);
> +	if (retval == NULL)
> +		handler_call_die(handler_name);
> +exit:
> +	Py_DECREF(t);
> +}
> +
> +static void python_process_event(union perf_event *pevent,
> +				 struct perf_sample *sample,
> +				 struct perf_evsel *evsel,
> +				 struct machine *machine,
> +				 struct thread *thread)
> +{
> +	switch (evsel->attr.type) {
> +	case PERF_TYPE_TRACEPOINT:
> +		python_process_tracepoint(pevent, sample, evsel, machine, thread);
> +		break;
> +	/* Reserve for future process_hw/sw/raw APIs */
> +	default:
> +		python_process_general_event(pevent, sample, evsel, machine, thread);
> +	}
> +}
> +
>  static int run_start_sub(void)
>  {
>  	PyObject *handler, *retval;
> -- 
> 1.7.1
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