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Diffstat (limited to 'bcc/misc/android-futex-contention.py')
| -rw-r--r-- | bcc/misc/android-futex-contention.py | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/bcc/misc/android-futex-contention.py b/bcc/misc/android-futex-contention.py deleted file mode 100644 index 5ef3841..0000000 --- a/bcc/misc/android-futex-contention.py +++ /dev/null @@ -1,115 +0,0 @@ -# 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 -waker_wakee = {} # maps the futex waker to wakee -max_waits = {} # Details about a maximum contention like owner, owner chain -process_names = {} # long-lived pid-to-execname mapping - -def android_lock(callchain): - for c in callchain: - if 'sym' in c and 'name' in c['sym']: - name = c['sym']['name'] - else: - continue - - if 'art::Monitor::Lock' in name: - return True - return False - -def print_callchain(callchain): - for c in callchain: - if 'sym' in c and 'name' in c['sym']: - name = c['sym']['name'] - else: - continue - - print(" %s" % (name)) - -def sched__sched_waking(event_name, context, common_cpu, - common_secs, common_nsecs, common_pid, common_comm, - common_callchain, comm, pid, prio, success, - target_cpu): - waker_wakee[pid] = [common_pid, common_callchain] - -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 or android_lock(callchain) == False: - return # we don't care about originators of WAKE events - # or futex uses that aren't android locks. - - 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): - - waker_pid = -1 - waker_chain = "[no call chain]" - - if thread_blocktime.has_key(tid): - # Gather stats about the contention (sum, min, max) - elapsed = nsecs(s, ns) - thread_blocktime[tid] - add_stats(lock_waits, (tid, thread_thislock[tid]), elapsed) - - # Track details about the maximum contention seen - # including owner and its callchain - if (tid, thread_thislock[tid]) in max_waits: - prev_wait = max_waits[(tid, thread_thislock[tid])][0] - else: - prev_wait = 0 - - if elapsed > prev_wait: - if tid in waker_wakee: - waker_pid = waker_wakee[tid][0] - waker_chain = waker_wakee[tid][1] - - max_waits[(tid, thread_thislock[tid])] = [elapsed, waker_pid, waker_chain, callchain] - - 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: - print("\n==============================================================\n") - min, max, avg, count = lock_waits[tid, lock] - print "%s[%d] lock %x contended %d times, %d avg ns, %d max ns" % \ - (process_names[tid], tid, lock, count, avg, max) - print "" - - if not (tid, lock) in max_waits: - print"Max contention info not available" - continue - - print "Callstack of suffering task:" - print_callchain(max_waits[tid, lock][3]) - print "" - - waker_pid = max_waits[tid, lock][1] - waker_name = process_names[waker_pid] if waker_pid in process_names else "nameless-owner" - print "Owner %s caused this contention of %d ns. Owner's Call stack below:" % (waker_name, max_waits[tid, lock][0]) - print_callchain(max_waits[tid, lock][2]) - |