| 1 | |
| 2 | |
| 3 | |
| 4 | |
| 5 |
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| 6 | import perf
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| 7 |
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| 8 | class tracepoint(perf.evsel):
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| 9 | def __init__(self, sys, name):
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| 10 | config = perf.tracepoint(sys, name)
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| 11 | perf.evsel.__init__(self,
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| 12 | type = perf.TYPE_TRACEPOINT,
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| 13 | config = config,
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| 14 | freq = 0, sample_period = 1, wakeup_events = 1,
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| 15 | sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_RAW | perf.SAMPLE_TIME)
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| 16 |
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| 17 | def main():
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| 18 | tp = tracepoint("sched", "sched_switch")
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| 19 | cpus = perf.cpu_map()
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| 20 | threads = perf.thread_map(-1)
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| 21 |
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| 22 | evlist = perf.evlist(cpus, threads)
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| 23 | evlist.add(tp)
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| 24 | evlist.open()
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| 25 | evlist.mmap()
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| 26 |
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| 27 | while True:
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| 28 | evlist.poll(timeout = -1)
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| 29 | for cpu in cpus:
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| 30 | event = evlist.read_on_cpu(cpu)
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| 31 | if not event:
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| 32 | continue
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| 33 |
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| 34 | if not isinstance(event, perf.sample_event):
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| 35 | continue
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| 36 |
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| 37 | print "time %u prev_comm=%s prev_pid=%d prev_prio=%d prev_state=0x%x ==> next_comm=%s next_pid=%d next_prio=%d" % (
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| 38 | event.sample_time,
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| 39 | event.prev_comm,
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| 40 | event.prev_pid,
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| 41 | event.prev_prio,
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| 42 | event.prev_state,
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| 43 | event.next_comm,
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| 44 | event.next_pid,
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| 45 | event.next_prio)
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| 46 |
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| 47 | if __name__ == '__main__':
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| 48 | main()
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