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)
|
||
|
|
|