[PATCH 0/4] workqueue_trace: Add max execution time mesurement forper worklet

[Zhaolei]

Hi,

This patch add max execution time mesurement for per worklet.
It is useful for driver-developer and system administrator to
know which worklet runs how many time.

It need applied on top of patchset of:
workqueue_tracepoint: Add worklet tracepoints for worklet lifecycle tracing

Output is like:
 # CPU INSERTED EXECUTED M_EXECus TASKNAME:PID
 #  |     |        |        |      `-WORKFUNC
 #  |     |        |        |        |
     0      905      973          events/0:5
     0        1        1       37  |-reg_todo+0x0/0x41f
     0       13       12     2033  |-rt_worker_func+0x0/0x219
     0       49       48     3157  |-mce_work_fn+0x0/0x31
     0       14       13      939  |-check_corruption+0x0/0x2a
     0      707      706     3826  |-vmstat_update+0x0/0x33
     0        1        1     1846  |-power_supply_changed_work+0x0/0x3c
     0       11       11     2879  |-console_callback+0x0/0xe1
     0       30       29     1579  |-do_cache_clean+0x0/0x37
     0       74       74     2841  |-test_work+0x0/0x53
     0        3        2      252  |-rekey_seq_generator+0x0/0x5a
     0        1        1       21  |-grace_ender+0x0/0x14
     0        1        1     3701  `-flush_to_ldisc+0x0/0x15d
     0        0        0          cpuset:6
     0      658      658          khelper:7
     0      658      658     5735  `-__call_usermodehelper+0x0/0x77
     0        0        0          netns:11
 ...

Thanks
Zhaolei

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