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cfeb1d90a1
We want to be woken up for every PERF_RECORD_ event, attr.wakeup_events is only for PERF_RECORD_SAMPLE, so also use attr.watermark = 1 to fix that. Suggested-by: Peter Zijlstra <peterz@infradead.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-v3lnpwgrr8mllcr3ntduuqvc@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
42 lines
1.3 KiB
Python
Executable File
42 lines
1.3 KiB
Python
Executable File
#! /usr/bin/python
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# -*- python -*-
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# -*- coding: utf-8 -*-
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# twatch - Experimental use of the perf python interface
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# Copyright (C) 2011 Arnaldo Carvalho de Melo <acme@redhat.com>
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#
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# This application is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; version 2.
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#
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# This application is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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import perf
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def main():
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cpus = perf.cpu_map()
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threads = perf.thread_map()
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evsel = perf.evsel(task = 1, comm = 1, mmap = 0,
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wakeup_events = 1, watermark = 1,
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sample_id_all = 1,
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sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_TID)
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evsel.open(cpus = cpus, threads = threads);
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evlist = perf.evlist(cpus, threads)
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evlist.add(evsel)
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evlist.mmap()
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while True:
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evlist.poll(timeout = -1)
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for cpu in cpus:
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event = evlist.read_on_cpu(cpu)
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if not event:
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continue
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print "cpu: %2d, pid: %4d, tid: %4d" % (event.sample_cpu,
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event.sample_pid,
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event.sample_tid),
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print event
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if __name__ == '__main__':
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main()
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