原来 trace_pipe 会自动的清理掉 trace 中内容

root@martins3:/sys/kernel/tracing# cat trace_pipe
    kworker/10:0-1653074 [010] ..... 288658.063521: sync_hw_clock <-process_one_work
    kworker/10:0-1653074 [010] ..... 289317.061835: sync_hw_clock <-process_one_work
    kworker/10:2-1676855 [010] ..... 289976.060155: sync_hw_clock <-process_one_work
    kworker/10:1-1679443 [010] ..... 290635.058468: sync_hw_clock <-process_one_work
    kworker/10:0-1681849 [010] ..... 291294.056784: sync_hw_clock <-process_one_work
    kworker/10:0-1681849 [010] ..... 291953.055112: sync_hw_clock <-process_one_work
   kworker/10:73-1706703 [010] ..... 292612.053439: sync_hw_clock <-process_one_work
^C
root@martins3:/sys/kernel/tracing# cat trace
# tracer: function
#
# entries-in-buffer/entries-written: 0/0   #P:32
#
#                                _-----=> irqs-off/BH-disabled
#                               / _----=> need-resched
#                              | / _---=> hardirq/softirq
#                              || / _--=> preempt-depth
#                              ||| / _-=> migrate-disable
#                              |||| /     delay
#           TASK-PID     CPU#  |||||  TIMESTAMP  FUNCTION
#              | |         |   |||||     |         |

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