00204c3396
The equivalent to this SystemTAP script: http://sourceware.org/systemtap/wiki/WSFutexContention [root@doppio ~]# perf trace futex-contention Press control+C to stop and show the summary ^Cnpviewer.bin[15242] lock 7f0a8be19104 contended 29 times, 72806 avg ns npviewer.bin[15242] lock 7f0a8be19130 contended 2 times, 1355 avg ns synergyc[17245] lock f127f4 contended 1 times, 1830569 avg ns firefox[15116] lock 7f2b7238af0c contended 168 times, 1230390 avg ns synergyc[17245] lock f2fc20 contended 1 times, 33149 avg ns npviewer.bin[15255] lock 7f0a8be19074 contended 155 times, 73047 avg ns npviewer.bin[15255] lock 7f0a8be190a0 contended 127 times, 7088 avg ns synergyc[17247] lock f12854 contended 1 times, 46741 avg ns synergyc[17245] lock f12610 contended 1 times, 7358 avg ns [root@doppio ~]# Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
# futex contention
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# (c) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
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# Licensed under the terms of the GNU GPL License version 2
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#
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# Translation of:
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#
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# http://sourceware.org/systemtap/wiki/WSFutexContention
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#
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# to perf python scripting.
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#
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# Measures futex contention
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import os, sys
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sys.path.append(os.environ['PERF_EXEC_PATH'] + '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
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from Util import *
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process_names = {}
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thread_thislock = {}
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thread_blocktime = {}
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lock_waits = {} # long-lived stats on (tid,lock) blockage elapsed time
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process_names = {} # long-lived pid-to-execname mapping
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def syscalls__sys_enter_futex(event, ctxt, cpu, s, ns, tid, comm,
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nr, uaddr, op, val, utime, uaddr2, val3):
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cmd = op & FUTEX_CMD_MASK
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if cmd != FUTEX_WAIT:
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return # we don't care about originators of WAKE events
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process_names[tid] = comm
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thread_thislock[tid] = uaddr
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thread_blocktime[tid] = nsecs(s, ns)
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def syscalls__sys_exit_futex(event, ctxt, cpu, s, ns, tid, comm,
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nr, ret):
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if thread_blocktime.has_key(tid):
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elapsed = nsecs(s, ns) - thread_blocktime[tid]
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add_stats(lock_waits, (tid, thread_thislock[tid]), elapsed)
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del thread_blocktime[tid]
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del thread_thislock[tid]
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def trace_begin():
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print "Press control+C to stop and show the summary"
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def trace_end():
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for (tid, lock) in lock_waits:
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min, max, avg, count = lock_waits[tid, lock]
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print "%s[%d] lock %x contended %d times, %d avg ns" % \
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(process_names[tid], tid, lock, count, avg)
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