linux-kernelorg-stable/tools/perf/python/counting.py

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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. Committer testing: Build perf and make the generated python binding somewhere you can point to to avoid using the one in the distro python3-perf (fedora, may be different in other distros): $ make -k O=/tmp/build/$(basename $PWD)/ -C tools/perf install-bin Copy /tmp/build/perf-tools-next/python/perf.cpython-313-x86_64-linux-gnu.so to somewhere outside this toolbox container and then use it with root: # export PYTHONPATH=/root/python/ # ls -la /root/python/ total 10640 drwxr-xr-x. 1 root root 72 May 21 11:40 . dr-xr-x---. 1 root root 574 May 21 11:40 .. -rwxr-xr-x. 1 acme acme 10894360 May 21 11:40 perf.cpython-313-x86_64-linux-gnu.so # tools/perf/python/counting.py | head -5 For evsel(software/cpu-clock/) val: 2930946 enable: 2932479 run: 2932479 For evsel(software/cpu-clock/) val: 2924975 enable: 2926267 run: 2926267 For evsel(software/cpu-clock/) val: 2921017 enable: 2922430 run: 2922430 For evsel(software/cpu-clock/) val: 2914966 enable: 2916549 run: 2916549 For evsel(software/cpu-clock/) val: 2910027 enable: 2911589 run: 2911589 # Signed-off-by: Gautam Menghani <gautam@linux.ibm.com> Tested-by: Arnaldo 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> [ make the API take a CPU and thread then compute from these the appropriate indices. ] Signed-off-by: Ian Rogers <irogers@google.com> Link: https://lore.kernel.org/linux-perf-users/CAP-5=fWb-=hCYmpg7U5N9C94EucQGTOS7YwR2-fo4ptOexzxyg@mail.gmail.com/ Link: https://lore.kernel.org/r/20250519195148.1708988-8-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2025-05-19 19:51:44 +00:00
#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
# -*- python -*-
# -*- coding: utf-8 -*-
import argparse
import perf
def main(event: str):
evlist = perf.parse_events(event)
for evsel in evlist:
evsel.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 evsel.cpus():
for thread in evsel.threads():
counts = evsel.read(cpu, thread)
print(f"For {evsel} val: {counts.val} enable: {counts.ena} run: {counts.run}")
evlist.close()
if __name__ == '__main__':
ap = argparse.ArgumentParser()
ap.add_argument('-e', '--event', help="Events to open", default="cpu-clock,task-clock")
args = ap.parse_args()
main(args.event)