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| #! /usr/bin/env python3
| # SPDX-License-Identifier: GPL-2.0
| # -*- python -*-
| # -*- coding: utf-8 -*-
|
| import perf
|
| class tracepoint(perf.evsel):
| def __init__(self, sys, name):
| config = perf.tracepoint(sys, name)
| perf.evsel.__init__(self,
| type = perf.TYPE_TRACEPOINT,
| config = config,
| freq = 0, sample_period = 1, wakeup_events = 1,
| sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_RAW | perf.SAMPLE_TIME)
|
| def main():
| tp = tracepoint("sched", "sched_switch")
| cpus = perf.cpu_map()
| threads = perf.thread_map(-1)
|
| evlist = perf.evlist(cpus, threads)
| evlist.add(tp)
| evlist.open()
| evlist.mmap()
|
| while True:
| evlist.poll(timeout = -1)
| for cpu in cpus:
| event = evlist.read_on_cpu(cpu)
| if not event:
| continue
|
| if not isinstance(event, perf.sample_event):
| continue
|
| 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" % (
| event.sample_time,
| event.prev_comm,
| event.prev_pid,
| event.prev_prio,
| event.prev_state,
| event.next_comm,
| event.next_pid,
| event.next_prio)
|
| if __name__ == '__main__':
| main()
|
|
