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4b15226c14
Add module docstrings to counting.py, tracepoint.py, and twatch.py. This
satisfies pylint's missing-module-docstring check and prepares these
existing standalone scripts in tools/perf/python/ for the later commit
in this series ("perf script: Support standalone scripts and remove
embedded scripting"), which updates 'perf script -l' to scan
tools/perf/python/ and display each script's module docstring:
```
$ perf script -l
List of available scripts:
...
counting
Example for counting perf events.
...
tracepoint
Example showing how to enable a tracepoint and access its fields.
twatch
Example to show how to enable a software event and track
context switches.
...
```
Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
38 lines
937 B
Python
Executable File
38 lines
937 B
Python
Executable File
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0
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"""Example for counting perf events."""
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# -*- python -*-
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# -*- coding: utf-8 -*-
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import argparse
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import perf
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def main(event: str):
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evlist = perf.parse_events(event)
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for evsel in evlist:
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evsel.read_format = perf.FORMAT_TOTAL_TIME_ENABLED | perf.FORMAT_TOTAL_TIME_RUNNING
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evlist.open()
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evlist.enable()
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count = 100000
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while count > 0:
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count -= 1
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evlist.disable()
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for evsel in evlist:
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for cpu in evsel.cpus():
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for thread in evsel.threads():
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counts = evsel.read(cpu, thread)
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print(f"For {evsel} val: {counts.val} enable: {counts.ena} run: {counts.run}")
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evlist.close()
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if __name__ == '__main__':
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ap = argparse.ArgumentParser()
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ap.add_argument('-e', '--event', help="Events to open", default="cpu-clock,task-clock")
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args = ap.parse_args()
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main(args.event)
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