LXR linux/tools/perf/python/twatch.py

   1#! /usr/bin/python
   2# -*- python -*-
   3# -*- coding: utf-8 -*-
   4#   twatch - Experimental use of the perf python interface
   5#   Copyright (C) 2011 Arnaldo Carvalho de Melo <acme@redhat.com>
   6#
   7#   This application is free software; you can redistribute it and/or
   8#   modify it under the terms of the GNU General Public License
   9#   as published by the Free Software Foundation; version 2.
  10#
  11#   This application is distributed in the hope that it will be useful,
  12#   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14#   General Public License for more details.
  15
  16import perf
  17
  18def main():
  19        cpus = perf.cpu_map()
  20        threads = perf.thread_map()
  21        evsel = perf.evsel(task = 1, comm = 1, mmap = 0,
  22                           wakeup_events = 1, sample_period = 1,
  23                           sample_id_all = 1,
  24                           sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_TID)
  25        evsel.open(cpus = cpus, threads = threads);
  26        evlist = perf.evlist(cpus, threads)
  27        evlist.add(evsel)
  28        evlist.mmap()
  29        while True:
  30                evlist.poll(timeout = -1)
  31                for cpu in cpus:
  32                        event = evlist.read_on_cpu(cpu)
  33                        if not event:
  34                                continue
  35                        print "cpu: %2d, pid: %4d, tid: %4d" % (event.sample_cpu,
  36                                                                event.sample_pid,
  37                                                                event.sample_tid),
  38                        print event
  39
  40if __name__ == '__main__':
  41    main()
  42