[PATCH 0/4] ftrace, workqueuetrace: Add worklet informationame

[Zhaolei]

Hello,

To make workqueuetrace support per-worklet's time mesurement(max execution,
latecy), workqueue trace need to support per-worklet's stat information first.
This patchset add them.

Before patch:
# cat [debugfs]/tracing/trace_stat/workqueues
# CPU  INSERTED  EXECUTED   NAME
# |      |         |          |

  0    589        589       events/0
  0      0          0       cpuset
  0    656        656       khelper
  0      0          0       netns
  0    809        809       kblockd/0
  0      0          0       kacpid
  0      0          0       kacpi_notify
  0      0          0       ata/0
  0      0          0       ata_aux
  0      0          0       ksuspend_usbd
  0      0          0       aio/0
  0      0          0       nfsiod
  0      0          0       crypto/0
  0      0          0       kpsmoused
  0      0          0       kstriped
  0      0          0       kondemand/0
  0      0          0       usbhid_resumer
  0     21         21       rpciod/0

After patch:
# cat [debugfs]/tracing/trace_stat/workqueues
# CPU  INSERTED  EXECUTED   TASKNAME:PID
# |      |         |        `-WORKFUNC
# |      |         |          |
  0    273        273       events/0:5
  0      1          1        |-reg_todo+0x0/0x648
  0      4          4        |-check_corruption+0x0/0x2c
  0      1          1        |-power_supply_changed_work+0x0/0x3c
  0      6          6        |-console_callback+0x0/0x145
  0    229        229        |-vmstat_update+0x0/0x33
  0     12         12        |-do_cache_clean+0x0/0x6a
  0      1          1        |-wq_barrier_func+0x0/0x12
  0     15         15        |-mce_work_fn+0x0/0x31
  0      3          3        |-rt_worker_func+0x0/0x2de
  0      1          1        `-grace_ender+0x0/0x14
  0      0          0       cpuset:6
  0    659        659       khelper:7
  0    659        659        `-__call_usermodehelper+0x0/0xa0
  0      0          0       netns:11
  0   1818       1818       kblockd/0:13
  0   1115       1115        |-blk_unplug_work+0x0/0x1e
  0    703        703        `-cfq_kick_queue+0x0/0x2f
  0      0          0       kacpid:412
  0      0          0       kacpi_notify:415
  0      0          0       ata/0:463
  0      0          0       ata_aux:509
  0      0          0       ksuspend_usbd:515
  0      0          0       aio/0:717
  0      0          0       nfsiod:764
  0      0          0       crypto/0:785
  0      0          0       kpsmoused:1141
  0      0          0       kstriped:1248
  0      0          0       kondemand/0:1259
  0      0          0       usbhid_resumer:1264
  0     20         20       rpciod/0:1333
  0      1          1        |-xs_tcp_connect_worker4+0x0/0x1b
  0     19         19        `-xs_udp_connect_worker4+0x0/0x130

After this step, we'll begin to add worklet time mesurement support to
workqueuetrace.

Thanks
Zhaolei

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