forked from Minki/linux
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>
51 lines
1.5 KiB
Python
51 lines
1.5 KiB
Python
# futex contention
|
|
# (c) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
# Licensed under the terms of the GNU GPL License version 2
|
|
#
|
|
# Translation of:
|
|
#
|
|
# http://sourceware.org/systemtap/wiki/WSFutexContention
|
|
#
|
|
# to perf python scripting.
|
|
#
|
|
# Measures futex contention
|
|
|
|
import os, sys
|
|
sys.path.append(os.environ['PERF_EXEC_PATH'] + '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
|
|
from Util import *
|
|
|
|
process_names = {}
|
|
thread_thislock = {}
|
|
thread_blocktime = {}
|
|
|
|
lock_waits = {} # long-lived stats on (tid,lock) blockage elapsed time
|
|
process_names = {} # long-lived pid-to-execname mapping
|
|
|
|
def syscalls__sys_enter_futex(event, ctxt, cpu, s, ns, tid, comm,
|
|
nr, uaddr, op, val, utime, uaddr2, val3):
|
|
cmd = op & FUTEX_CMD_MASK
|
|
if cmd != FUTEX_WAIT:
|
|
return # we don't care about originators of WAKE events
|
|
|
|
process_names[tid] = comm
|
|
thread_thislock[tid] = uaddr
|
|
thread_blocktime[tid] = nsecs(s, ns)
|
|
|
|
def syscalls__sys_exit_futex(event, ctxt, cpu, s, ns, tid, comm,
|
|
nr, ret):
|
|
if thread_blocktime.has_key(tid):
|
|
elapsed = nsecs(s, ns) - thread_blocktime[tid]
|
|
add_stats(lock_waits, (tid, thread_thislock[tid]), elapsed)
|
|
del thread_blocktime[tid]
|
|
del thread_thislock[tid]
|
|
|
|
def trace_begin():
|
|
print "Press control+C to stop and show the summary"
|
|
|
|
def trace_end():
|
|
for (tid, lock) in lock_waits:
|
|
min, max, avg, count = lock_waits[tid, lock]
|
|
print "%s[%d] lock %x contended %d times, %d avg ns" % \
|
|
(process_names[tid], tid, lock, count, avg)
|
|
|