1#! /usr/bin/python 2# SPDX-License-Identifier: GPL-2.0 3# -*- python -*- 4# -*- coding: utf-8 -*- 5 6import perf 7 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 continue 33 34 if not isinstance(event, perf.sample_event): 35 continue 36 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