forked from mirrors/linux
0f5f5bcd11
This provides valuable information for tracing performance problems. Since this change alters the interface for the python scripts, also adjust the script generation and the provided scripts. Signed-off-by: Joseph Schuchart <joseph.schuchart@tu-dresden.de> Acked-by: Thomas Ilsche <thomas.ilsche@tu-dresden.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Ilsche <thomas.ilsche@tu-dresden.de> Link: http://lkml.kernel.org/r/53BE7E1B.10503@tu-dresden.de Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
50 lines
1.5 KiB
Python
50 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, callchain,
|
|
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, callchain,
|
|
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)
|
|
|