49 lines · python
1#! /usr/bin/env python2# SPDX-License-Identifier: GPL-2.03# -*- python -*-4# -*- coding: utf-8 -*-5 6import perf7 8class tracepoint(perf.evsel):9 def __init__(self, sys, name):10 config = perf.tracepoint(sys, name)11 perf.evsel.__init__(self,12 type = perf.TYPE_TRACEPOINT,13 config = config,14 freq = 0, sample_period = 1, wakeup_events = 1,15 sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_RAW | perf.SAMPLE_TIME)16 17def main():18 tp = tracepoint("sched", "sched_switch")19 cpus = perf.cpu_map()20 threads = perf.thread_map(-1)21 22 evlist = perf.evlist(cpus, threads)23 evlist.add(tp)24 evlist.open()25 evlist.mmap()26 27 while True:28 evlist.poll(timeout = -1)29 for cpu in cpus:30 event = evlist.read_on_cpu(cpu)31 if not event:32 continue33 34 if not isinstance(event, perf.sample_event):35 continue36 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" % (38 event.sample_time,39 event.prev_comm,40 event.prev_pid,41 event.prev_prio,42 event.prev_state,43 event.next_comm,44 event.next_pid,45 event.next_prio))46 47if __name__ == '__main__':48 main()49