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
  16 import perf
  17
  18 def 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, watermark = 1,
  23                            sample_id_all = 1,
  24                            sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU)
  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
  40 if __name__ == '__main__':
  41     main()