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 (at] 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() 42
