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

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_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: Feng 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 da37896, i.e. pevent parm in script event handlers ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Feng Tang 2012-08-08 17:57:51 +08:00 committed by Arnaldo Carvalho de Melo
parent 2055fdaf87
commit 6a6daec2ae
1 changed files with 58 additions and 1 deletions
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59
tools/perf/util/scripting-engines/trace-event-python.c
View File

@ -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;