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# 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)

actions: Rename Trap / Discard Action to Trap ActionJiri Pirko 2020-02-23mlxsw: spectrum_trap: Move functions to avoid their forward declarationsJiri Pirko 2020-02-23mlxsw: spectrum_trap: Use err variable instead of directly checking func retu...Jiri Pirko 2020-02-22mlxsw: spectrum: Remove RTNL where possibleIdo Schimmel 2020-02-22mlxsw: spectrum_router: Take router lock from exported helpersIdo Schimmel 2020-02-22mlxsw: spectrum_router: Take router lock from inetaddr listenersIdo Schimmel 2020-02-22mlxsw: spectrum_router: Take router lock from netdev listenerIdo Schimmel 2020-02-22mlxsw: spectrum_dpipe: Take router lock from dpipe codeIdo Schimmel 2020-02-22mlxsw: spectrum_router: Take router lock from inside routing codeIdo Schimmel 2020-02-22mlxsw: spectrum_router: Introduce router lockIdo Schimmel 2020-02-22mlxsw: spectrum_router: Store NVE decapsulation configuration in routerIdo Schimmel 2020-02-22mlxsw: spectrum_router: Expose router struct to internal usersIdo Schimmel 2020-02-22mlxsw: spectrum_mr: Protect multicast route list with a lockIdo Schimmel 2020-02-22mlxsw: spectrum_mr: Protect multicast table list with a lockIdo Schimmel 2020-02-22mlxsw: spectrum_mr: Publish multicast route after writing it to the deviceIdo Schimmel 2020-02-21net/mlx5: Add fsm_reactivate callback supportEran Ben Elisha 2020-02-21net/mlxfw: Add reactivate flow support to FSM burn flowEran Ben Elisha 2020-02-21net/mlxfw: Use MLXFW_ERR_MSG macro for error reportingSaeed Mahameed 2020-02-21net/mlxfw: Convert pr_* to dev_* in mlxfw_fsm.cSaeed Mahameed 2020-02-21net/mlxfw: More error messages coverageSaeed Mahameed 2020-02-21net/mlxfw: Improve FSM err message reporting and return codesSaeed Mahameed 2020-02-21net/mlxfw: Generic mlx FW flash status notifySaeed Mahameed