tracepoint.py 1.5 KB

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  1. #! /usr/bin/env python
  2. # SPDX-License-Identifier: GPL-2.0
  3. # -*- python -*-
  4. # -*- coding: utf-8 -*-
  5. import perf
  6. class tracepoint(perf.evsel):
  7. def __init__(self, sys, name):
  8. config = perf.tracepoint(sys, name)
  9. perf.evsel.__init__(self,
  10. type = perf.TYPE_TRACEPOINT,
  11. config = config,
  12. freq = 0, sample_period = 1, wakeup_events = 1,
  13. sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_RAW | perf.SAMPLE_TIME)
  14. def main():
  15. tp = tracepoint("sched", "sched_switch")
  16. cpus = perf.cpu_map()
  17. threads = perf.thread_map(-1)
  18. evlist = perf.evlist(cpus, threads)
  19. evlist.add(tp)
  20. evlist.open()
  21. evlist.mmap()
  22. while True:
  23. evlist.poll(timeout = -1)
  24. for cpu in cpus:
  25. event = evlist.read_on_cpu(cpu)
  26. if not event:
  27. continue
  28. if not isinstance(event, perf.sample_event):
  29. continue
  30. 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" % (
  31. event.sample_time,
  32. event.prev_comm,
  33. event.prev_pid,
  34. event.prev_prio,
  35. event.prev_state,
  36. event.next_comm,
  37. event.next_pid,
  38. event.next_prio)
  39. if __name__ == '__main__':
  40. main()