no patches:
# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.233
Time: 4.117
Time: 4.144
Time: 4.190
Time: 4.228
Time: 4.178
Time: 4.204
Time: 4.214
Time: 4.158
Time: 4.287
Avg: 4.1953


patches: config
CONFIG_TRACER_MAX_TRACE=y
CONFIG_TRACING=y
CONFIG_EVENT_TRACER=y
CONFIG_WAKEUP_TRACER=y
CONFIG_CONTEXT_SWITCH_TRACER=y
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.318
Time: 4.253
Time: 4.137
Time: 4.322
Time: 4.249
Time: 4.260
Time: 4.279
Time: 4.276
Time: 4.247
Time: 4.308
Avg: 4.2649
  (1.658999)

event - not enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.214
Time: 4.372
Time: 4.246
Time: 4.297
Time: 4.292
Time: 4.209
Time: 4.227
Time: 4.215
Time: 4.362
Time: 4.283
Avg: 4.2717
  (1.821086)

event - enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.210
Time: 4.394
Time: 4.380
Time: 4.442
Time: 4.457
Time: 4.215
Time: 4.204
Time: 4.308
Time: 4.286
Time: 4.353
Avg: 4.3249
  (3.089171)

wakeup - not enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.263
Time: 4.285
Time: 4.282
Time: 4.303
Time: 4.241
Time: 4.267
Time: 4.301
Time: 4.288
Time: 4.473
Time: 4.239
Avg: 4.2942
  (2.357400)

wakeup - enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.293
Time: 4.272
Time: 4.301
Time: 4.303
Time: 4.467
Time: 4.236
Time: 4.206
Time: 4.396
Time: 4.385
Time: 4.265
Avg: 4.3124
  (2.791219)

sched_switch - not enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.288
Time: 4.289
Time: 4.284
Time: 4.293
Time: 4.269
Time: 4.285
Time: 4.315
Time: 4.372
Time: 4.442
Time: 4.281
Avg: 4.3118
  (2.776917)

sched_switch - enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.228
Time: 4.295
Time: 4.247
Time: 4.308
Time: 4.206
Time: 4.275
Time: 4.218
Time: 4.292
Time: 4.227
Time: 4.256
Avg: 4.2552
  (1.427788)


config:
CONFIG_TRACER_MAX_TRACE=y
CONFIG_TRACING=y
CONFIG_CRITICAL_PREEMPT_TIMING=y

preempt not enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.804
Time: 4.676
Time: 4.678
Time: 4.700
Time: 4.586
Time: 4.590
Time: 4.739
Time: 4.696
Time: 4.670
Time: 4.629
Avg: 4.6768
  (11.477129)

preempt enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 9.237
Time: 9.238
Time: 9.297
Time: 9.117
Time: 8.680
Time: 9.337
Time: 9.147
Time: 9.203
Time: 9.302
Time: 9.226
Avg: 9.1784
  (118.778157)


config:
CONFIG_TRACER_MAX_TRACE=y
CONFIG_TRACING=y
CONFIG_CRITICAL_IRQSOFF_TIMING=y

irqsoff not enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.853
Time: 4.699
Time: 4.747
Time: 4.734
Time: 4.770
Time: 4.806
Time: 4.804
Time: 4.787
Time: 4.898
Time: 4.646
Avg: 4.7744
  (13.803542)

irqsoff enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 10.390
Time: 10.363
Time: 10.415
Time: 10.407
Time: 10.414
Time: 9.908
Time: 10.361
Time: 10.378
Time: 10.642
Time: 10.363
Avg: 10.3641
  (147.040736)


config:
CONFIG_TRACER_MAX_TRACE=y
CONFIG_TRACING=y
CONFIG_CRITICAL_IRQSOFF_TIMING=y
CONFIG_CRITICAL_PREEMPT_TIMING=y

everything not enabled:
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 5.014
Time: 5.156
Time: 5.044
Time: 5.059
Time: 5.039
Time: 5.056
Time: 5.118
Time: 5.144
Time: 5.107
Time: 5.086
Avg: 5.0823
  (21.142707)

irqsoff enabled:
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 15.942
Time: 15.996
Time: 16.140
Time: 15.961
Time: 15.948
Time: 15.967
Time: 15.956
Time: 15.997
Time: 16.165
Time: 16.122
Avg: 16.0194
  (281.841585)

preemptoff enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 9.856
Time: 9.636
Time: 9.814
Time: 9.888
Time: 9.922
Time: 9.896
Time: 9.765
Time: 9.730
Time: 9.938
Time: 9.667
Avg: 9.8112
  (133.861702)


preemptirqsoff enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 15.927
Time: 15.942
Time: 15.944
Time: 15.983
Time: 15.905
Time: 15.937
Time: 15.908
Time: 16.015
Time: 15.943
Time: 16.039
Avg: 15.9543
  (280.289848)


config:
CONFIG_MCOUNT=y
CONFIG_TRACING=y
CONFIG_FUNCTION_TRACER=y
CONFIG_CONTEXT_SWITCH_TRACER=y

function not enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.896
Time: 4.927
Time: 4.876
Time: 4.782
Time: 4.786
Time: 4.900
Time: 4.846
Time: 4.941
Time: 4.818
Time: 4.866
Avg: 4.8638
  (15.934498)

mcount enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 6.250
Time: 6.383
Time: 6.200
Time: 6.299
Time: 6.378
Time: 6.269
Time: 6.315
Time: 6.165
Time: 6.291
Time: 6.269
Avg: 6.2819
  (49.736610)

mcount and function enabled
[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 24.981
Time: 25.181
Time: 25.029
Time: 25.188
Time: 25.179
Time: 25.157
Time: 25.955
Time: 24.969
Time: 25.141
Time: 25.255
Avg: 25.2035
  (500.755607)

config:
CONFIG_TRACER_MAX_TRACE=y
CONFIG_TRACING=y
CONFIG_WAKEUP_TRACER=y
CONFIG_CONTEXT_SWITCH_TRACER=y
CONFIG_WAKEUP_LATENCY_HIST=y

[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 4.169
Time: 4.164
Time: 4.350
Time: 4.282
Time: 4.407
Time: 4.191
Time: 4.306
Time: 4.303
Time: 4.313
Time: 4.195
Avg: 4.268
  (1.732892)

config:
CONFIG_TRACER_MAX_TRACE=y
CONFIG_TRACING=y
CONFIG_CRITICAL_IRQSOFF_TIMING=y
CONFIG_INTERRUPT_OFF_HIST=y

[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 6.886
Time: 6.853
Time: 6.921
Time: 6.877
Time: 6.824
Time: 7.019
Time: 6.842
Time: 6.994
Time: 6.746
Time: 7.092
Avg: 6.9054
  (64.598479)

config:
CONFIG_HAVE_MCOUNT=y
CONFIG_TRACER_MAX_TRACE=y
CONFIG_TRACING=y
CONFIG_CRITICAL_PREEMPT_TIMING=y
CONFIG_PREEMPT_OFF_HIST=y

[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 5.898
Time: 5.845
Time: 5.878
Time: 5.806
Time: 5.889
Time: 5.850
Time: 5.960
Time: 5.984
Time: 5.897
Time: 5.946
Avg: 5.8953
  (40.521536)

config:
CONFIG_HAVE_MCOUNT=y
CONFIG_TRACER_MAX_TRACE=y
CONFIG_TRACING=y
CONFIG_CRITICAL_IRQSOFF_TIMING=y
CONFIG_CRITICAL_PREEMPT_TIMING=y
CONFIG_INTERRUPT_OFF_HIST=y
CONFIG_PREEMPT_OFF_HIST=y

[root@bxrhel5 c]# for i in `seq 1 10`; do ./hackbench 50 ; done
Time: 14.781
Time: 14.912
Time: 14.810
Time: 14.839
Time: 14.769
Time: 14.766
Time: 14.815
Time: 14.767
Time: 14.764
Time: 14.808
Avg: 14.8031
  (252.849617)