Commit 739621f6 authored by Gautam Menghani's avatar Gautam Menghani Committed by Arnaldo Carvalho de Melo
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perf python: Add evsel read method 



Add the evsel read method to enable python to read counter data for the
given evsel.

Signed-off-by: default avatarGautam Menghani <gautam@linux.ibm.com>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/linux-perf-users/20250512055748.479786-1-gautam@linux.ibm.com/
Link: https://lore.kernel.org/r/20250519195148.1708988-6-irogers@google.com


[ make the API take a CPU and thread then compute from these the appropriate indices. ]
Signed-off-by: default avatarIan Rogers <irogers@google.com>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 3b4991dc

tools/perf/util/python.c

+37 −0
Original line number Diff line number Diff line
@@ -888,6 +888,37 @@ static PyObject *pyrf_evsel__threads(struct pyrf_evsel *pevsel) 
	return (PyObject *)pthread_map;

}



static PyObject *pyrf_evsel__read(struct pyrf_evsel *pevsel,

				  PyObject *args, PyObject *kwargs)

{

	struct evsel *evsel = &pevsel->evsel;

	int cpu = 0, cpu_idx, thread = 0, thread_idx;

	struct perf_counts_values counts;

	struct pyrf_counts_values *count_values = PyObject_New(struct pyrf_counts_values,

							       &pyrf_counts_values__type);



	if (!count_values)

		return NULL;



	if (!PyArg_ParseTuple(args, "ii", &cpu, &thread))

		return NULL;



	cpu_idx = perf_cpu_map__idx(evsel->core.cpus, (struct perf_cpu){.cpu = cpu});

	if (cpu_idx < 0) {

		PyErr_Format(PyExc_TypeError, "CPU %d is not part of evsel's CPUs", cpu);

		return NULL;

	}

	thread_idx = perf_thread_map__idx(evsel->core.threads, thread);

	if (cpu_idx < 0) {

		PyErr_Format(PyExc_TypeError, "Thread %d is not part of evsel's threads",

			     thread);

		return NULL;

	}

	perf_evsel__read(&(evsel->core), cpu_idx, thread_idx, &counts);

	count_values->values = counts;

	return (PyObject *)count_values;

}



static PyObject *pyrf_evsel__str(PyObject *self)

{

	struct pyrf_evsel *pevsel = (void *)self;
@@ -918,6 +949,12 @@ static PyMethodDef pyrf_evsel__methods[] = { 
		.ml_flags = METH_NOARGS,

		.ml_doc	  = PyDoc_STR("threads the event is to be used with.")

	},

	{

		.ml_name  = "read",

		.ml_meth  = (PyCFunction)pyrf_evsel__read,

		.ml_flags = METH_VARARGS | METH_KEYWORDS,

		.ml_doc	  = PyDoc_STR("read counters")

	},

	{ .ml_name = NULL, }

};