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Commit 6a6daec2 authored by Feng Tang's avatar Feng Tang Committed by Arnaldo Carvalho de Melo
Browse files

perf script: Add general python handler to process non-tracepoint events 



This patch just follows Robert Richter's idea and the commit 37a058ea
	"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_event" in the python script, and pass the event 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: default avatarFeng Tang <feng.tang@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1344419875-21665-2-git-send-email-feng.tang@intel.com


[ committer note: Fixed up wrt da378962, i.e. pevent parm in script event handlers ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 2055fdaf

tools/perf/util/scripting-engines/trace-event-python.c

+58 −1
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include "../event.h"

#include "../thread.h"

#include "../trace-event.h"

#include "../evsel.h"



PyMODINIT_FUNC initperf_trace_context(void);
@@ -220,7 +221,7 @@ static inline struct event_format *find_cache_event(struct perf_evsel *evsel) 
	return event;

}



static void python_process_event(union perf_event *perf_event __unused,

static void python_process_tracepoint(union perf_event *perf_event __unused,

				 struct perf_sample *sample,

				 struct perf_evsel *evsel,

				 struct machine *machine __unused,
@@ -337,6 +338,62 @@ static void python_process_event(union perf_event *perf_event __unused, 
	Py_DECREF(t);

}



static void python_process_general_event(union perf_event *perf_event __unused,

					 struct perf_sample *sample,

					 struct perf_evsel *evsel,

					 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");



	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((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));



	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 *perf_event,

				 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(perf_event, sample, evsel,

					  machine, thread);

		break;

	/* Reserve for future process_hw/sw/raw APIs */

	default:

		python_process_general_event(perf_event, sample, evsel,

					     machine, thread);

	}

}



static int run_start_sub(void)

{

	PyObject *handler, *retval;