#! /usr/bin/python # -*- 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() as Klauser

path: root/tools/virtio/virtio-trace/trace-agent.h

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