48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
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#! /usr/bin/python
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# -*- python -*-
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# -*- coding: utf-8 -*-
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import perf
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class tracepoint(perf.evsel):
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def __init__(self, sys, name):
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config = perf.tracepoint(sys, name)
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perf.evsel.__init__(self,
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type = perf.TYPE_TRACEPOINT,
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config = config,
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freq = 0, sample_period = 1, wakeup_events = 1,
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sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_RAW | perf.SAMPLE_TIME)
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def main():
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tp = tracepoint("sched", "sched_switch")
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cpus = perf.cpu_map()
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threads = perf.thread_map(-1)
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evlist = perf.evlist(cpus, threads)
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evlist.add(tp)
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evlist.open()
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evlist.mmap()
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while True:
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evlist.poll(timeout = -1)
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for cpu in cpus:
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event = evlist.read_on_cpu(cpu)
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if not event:
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continue
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if not isinstance(event, perf.sample_event):
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continue
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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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event.sample_time,
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event.prev_comm,
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event.prev_pid,
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event.prev_prio,
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event.prev_state,
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event.next_comm,
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event.next_pid,
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event.next_prio)
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if __name__ == '__main__':
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main()
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