linux-kernel - [PATCH v2 4/4] perf python: Add counting.py as example for counting perf events

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Message-ID: <20250512055748.479786-5-gautam@linux.ibm.com>
Date: Mon, 12 May 2025 11:27:45 +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 v2 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>
---
v1 -> v2:
1. Use existing iteration support instead of next
2. Read the counters on all cpus
3. Use existing helper functions

 tools/perf/python/counting.py | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 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..e535e3ae8bdf
--- /dev/null
+++ b/tools/perf/python/counting.py
@@ -0,0 +1,34 @@
+#!/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.parse_events("cpu-clock,task-clock", cpus, thread_map)
+
+        for ev in evlist:
+            ev.read_format = perf.FORMAT_TOTAL_TIME_ENABLED | perf.FORMAT_TOTAL_TIME_RUNNING
+
+        evlist.open()
+        evlist.enable()
+
+        count = 100000
+        while count > 0:
+            count -= 1
+
+        evlist.disable()
+
+        for evsel in evlist:
+            for cpu in cpus:
+                for thread in range(len(thread_map)):
+                    counts = evsel.read(cpu, thread)
+                    print(f"For {evsel} val: {counts.val} enable: {counts.ena} run: {counts.run}")
+
+        evlist.close()
+
+if __name__ == '__main__':
+    main()
-- 
2.49.0