linux-kernel - [PATCH 4/4] perf python: Add counting.py as example for counting perf events

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Message-ID: <20250501093633.578010-5-gautam@linux.ibm.com>
Date: Thu,  1 May 2025 15:06:30 +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 4/4] perf python: Add counting.py as example for counting perf events

Add counting.py - a python version of counting.c to demonstrate
measuring and reading of counts for given perf events.

Signed-off-by: Gautam Menghani <gautam@...ux.ibm.com>
---
 tools/perf/python/counting.py | 41 +++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100755 tools/perf/python/counting.py

diff --git a/tools/perf/python/counting.py b/tools/perf/python/counting.py
new file mode 100755
index 000000000000..0c58907bd8bf
--- /dev/null
+++ b/tools/perf/python/counting.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+# -*- python -*-
+# -*- coding: utf-8 -*-
+
+import perf
+
+def main():
+        cpus = perf.cpu_map()
+        thread_map = perf.thread_map(-1)
+        evlist = perf.evlist(cpus, thread_map)
+
+        evsel1 = perf.evsel(type = perf.TYPE_SOFTWARE,
+                 config = perf.COUNT_SW_CPU_CLOCK,
+                 read_format = perf.FORMAT_TOTAL_TIME_ENABLED | perf.FORMAT_TOTAL_TIME_RUNNING,
+                 disabled=1)
+        evlist.add(evsel1)
+
+        evsel2 = perf.evsel(type = perf.TYPE_SOFTWARE,
+                 config = perf.COUNT_SW_TASK_CLOCK,
+                 read_format = perf.FORMAT_TOTAL_TIME_ENABLED | perf.FORMAT_TOTAL_TIME_RUNNING,
+                 disabled=1)
+        evlist.add(evsel2)
+
+        evlist.open()
+        evlist.enable()
+
+        count = 100000
+        while count > 0:
+            count -= 1
+
+        evlist.disable()
+        evsel = evlist.next(None)
+        while evsel != None:
+            counts = evsel.read(0, 0)
+            print(counts.val, counts.ena, counts.run)
+            evsel = evlist.next(evsel)
+        evlist.close()
+
+if __name__ == '__main__':
+    main()
-- 
2.49.0