linux-kernel - [PATCH 2/4] perf python: Add evsel read method

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Message-ID: <20250501093633.578010-3-gautam@linux.ibm.com>
Date: Thu,  1 May 2025 15:06:28 +0530
From: Gautam Menghani <gautam@...ux.ibm.com>
To: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        namhyung@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        irogers@...gle.com, adrian.hunter@...el.com, kan.liang@...ux.intel.com
Cc: Gautam Menghani <gautam@...ux.ibm.com>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, maddy@...ux.ibm.com
Subject: [PATCH 2/4] perf python: Add evsel read method

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

Signed-off-by: Gautam Menghani <gautam@...ux.ibm.com>
---
 tools/perf/util/python.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 011ee2e27797..5a4d2c9aaabd 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -867,6 +867,23 @@ static PyObject *pyrf_evsel__open(struct pyrf_evsel *pevsel,
 	return Py_None;
 }
 
+static PyObject *pyrf_evsel__read(struct pyrf_evsel *pevsel,
+				  PyObject *args, PyObject *kwargs)
+{
+	struct evsel *evsel = &pevsel->evsel;
+	int cpu_map_idx = 0, thread = 0;
+	struct perf_counts_values counts;
+	struct pyrf_counts_values *count_values = PyObject_New(struct pyrf_counts_values,
+							       &pyrf_counts_values__type);
+
+	if (!PyArg_ParseTuple(args, "ii", &cpu_map_idx, &thread))
+		return NULL;
+
+	perf_evsel__read(&(evsel->core), cpu_map_idx, thread, &counts);
+	count_values->values = counts;
+	return (PyObject *)count_values;
+}
+
 static PyObject *pyrf_evsel__str(PyObject *self)
 {
 	struct pyrf_evsel *pevsel = (void *)self;
@@ -885,6 +902,12 @@ static PyMethodDef pyrf_evsel__methods[] = {
 		.ml_flags = METH_VARARGS | METH_KEYWORDS,
 		.ml_doc	  = PyDoc_STR("open the event selector file descriptor table.")
 	},
+	{
+		.ml_name  = "read",
+		.ml_meth  = (PyCFunction)pyrf_evsel__read,
+		.ml_flags = METH_VARARGS | METH_KEYWORDS,
+		.ml_doc	  = PyDoc_STR("read counters")
+	},
 	{ .ml_name = NULL, }
 };
 
-- 
2.49.0