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57 lines
1.7 KiB
57 lines
1.7 KiB
# futex contention |
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# (c) 2010, Arnaldo Carvalho de Melo <[email protected]> |
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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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from __future__ import print_function |
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import os |
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import sys |
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sys.path.append(os.environ['PERF_EXEC_PATH'] + |
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'/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, callchain, |
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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, callchain, |
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nr, ret): |
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if tid in thread_blocktime: |
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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 [max: %d ns, min %d ns]" % |
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(process_names[tid], tid, lock, count, avg, max, min))
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