twatch.py

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#! /usr/bin/python
# -*- python -*-
# -*- coding: utf-8 -*-
#   twatch - Experimental use of the perf python interface
#   Copyright (C) 2011 Arnaldo Carvalho de Melo <[email protected]>
#
#   This application is free software; you can redistribute it and/or
#   modify it under the terms of the GNU General Public License
#   as published by the Free Software Foundation; version 2.
#
#   This application is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#   General Public License for more details.

import perf

def main():
    cpus = perf.cpu_map()
    threads = perf.thread_map()
    evsel = perf.evsel(task = 1, comm = 1, mmap = 0,
               wakeup_events = 1, watermark = 1,
               sample_id_all = 1,
               sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_TID)
    evsel.open(cpus = cpus, threads = threads);
    evlist = perf.evlist(cpus, threads)
    evlist.add(evsel)
    evlist.mmap()
    while True:
        evlist.poll(timeout = -1)
        for cpu in cpus:
            event = evlist.read_on_cpu(cpu)
            if not event:
                continue
            print "cpu: %2d, pid: %4d, tid: %4d" % (event.sample_cpu,
                                event.sample_pid,
                                event.sample_tid),
            print event

if __name__ == '__main__':
    main()