如何在Linux上查找此抖动的来源？

以下是生成的系统跟踪文件：

# tracer: nop
#
# entries-in-buffer/entries-written: 34361/34361   #P:6
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |
          <idle>-0     [005] dN..   733.720555: hrtimer_cancel: hrtimer=ffff88087fd4eca0
          <idle>-0     [005] dN..   733.720555: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=733280000000 softexpires=733280000000
          <idle>-0     [005] d...   733.720556: sched_switch: prev_comm=swapper/5 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=taskset next_pid=1312 next_prio=120
            perf-1312  [005] ....   733.721806: hrtimer_init: hrtimer=ffff880850b53378 clockid=CLOCK_MONOTONIC mode=HRTIMER_MODE_REL
            perf-1312  [005] d...   733.721857: tick_stop: success=no msg=more than 1 task in runqueue

            perf-1312  [005] d...   733.721883: sched_switch: prev_comm=perf prev_pid=1312 prev_prio=120 prev_state=S ==> next_comm=perf next_pid=1314 next_prio=120
           a.out-1314  [005] dN..   733.721934: tick_stop: success=no msg=more than 1 task in runqueue

           a.out-1314  [005] d...   733.721936: sched_switch: prev_comm=perf prev_pid=1314 prev_prio=120 prev_state=R ==> next_comm=perf next_pid=1312 next_prio=120
            perf-1312  [005] d...   733.722111: sched_switch: prev_comm=perf prev_pid=1312 prev_prio=120 prev_state=S ==> next_comm=perf next_pid=1314 next_prio=120
           a.out-1314  [005] d.h.   733.722727: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d.h.   733.722728: hrtimer_expire_entry: hrtimer=ffff88087fd4eca0 function=tick_sched_timer now=733280000768
           a.out-1314  [005] d.h.   733.722731: hrtimer_expire_exit: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d.h.   733.722731: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=733284000000 softexpires=733284000000
           a.out-1314  [005] d...   733.722736: tick_stop: success=yes msg=
           a.out-1314  [005] d...   733.722737: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d...   733.722737: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=734280000000 softexpires=734280000000
           a.out-1314  [005] ....   733.722960: timer_init: timer=ffff88084f8ec1d8
           a.out-1314  [005] d.s.   733.723023: timer_start: timer=ffff8808518d0650 function=neigh_timer_handler expires=4295075867 [timeout=250]
           a.out-1314  [005] d...   733.986838: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d...   733.986839: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=734044000000 softexpires=734044000000
           a.out-1314  [005] d.h.   734.487025: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d.h.   734.487025: hrtimer_expire_entry: hrtimer=ffff88087fd4eca0 function=tick_sched_timer now=734044000419
           a.out-1314  [005] d.h.   734.487028: hrtimer_expire_exit: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d.h.   734.487028: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=734048000000 softexpires=734048000000
           a.out-1314  [005] d.s.   734.487029: timer_cancel: timer=ffffffff81efd6a0
           a.out-1314  [005] ..s.   734.487030: timer_expire_entry: timer=ffffffff81efd6a0 function=clocksource_watchdog now=4295075808
           a.out-1314  [005] d.s.   734.487031: timer_start: timer=ffffffff81efd6a0 function=clocksource_watchdog expires=4295075933 [timeout=125]
           a.out-1314  [005] ..s.   734.487032: timer_expire_exit: timer=ffffffff81efd6a0
           a.out-1314  [005] d...   734.487033: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d...   734.487033: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=734280000000 softexpires=734280000000
           a.out-1314  [005] d...   734.487033: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d...   734.487033: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=734280000000 softexpires=734280000000
           a.out-1314  [005] d.h.   734.723117: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d.h.   734.723117: hrtimer_expire_entry: hrtimer=ffff88087fd4eca0 function=tick_sched_timer now=734280000410
           a.out-1314  [005] d.h.   734.723119: hrtimer_expire_exit: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d.h.   734.723119: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=734284000000 softexpires=734284000000
           a.out-1314  [005] d.s.   734.723120: timer_cancel: timer=ffff8808518d0650
           a.out-1314  [005] ..s.   734.723120: timer_expire_entry: timer=ffff8808518d0650 function=neigh_timer_handler now=4295075867
           a.out-1314  [005] d.s.   734.723122: timer_start: timer=ffff8808518d0650 function=neigh_timer_handler expires=4295076117 [timeout=250]
           a.out-1314  [005] ..s.   734.723126: timer_expire_exit: timer=ffff8808518d0650
           a.out-1314  [005] d...   734.723127: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d...   734.723127: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=735280000000 softexpires=735280000000
           a.out-1314  [005] d.h.   735.723507: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d.h.   735.723508: hrtimer_expire_entry: hrtimer=ffff88087fd4eca0 function=tick_sched_timer now=735280000448
           a.out-1314  [005] d.h.   735.723509: hrtimer_expire_exit: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d.h.   735.723509: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=735284000000 softexpires=735284000000
           a.out-1314  [005] d.s.   735.723511: timer_cancel: timer=ffff8808518d0650
           a.out-1314  [005] ..s.   735.723511: timer_expire_entry: timer=ffff8808518d0650 function=neigh_timer_handler now=4295076117
           a.out-1314  [005] d.s.   735.723512: timer_start: timer=ffff8808518d0650 function=neigh_timer_handler expires=4295076367 [timeout=250]
           a.out-1314  [005] ..s.   735.723515: timer_expire_exit: timer=ffff8808518d0650
           a.out-1314  [005] d...   735.723516: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d...   735.723516: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=736280000000 softexpires=736280000000
           a.out-1314  [005] d...   736.452298: timer_start: timer=ffff8800368823e0 function=commit_timeout expires=4295077736 [timeout=1437]
           a.out-1314  [005] d.h.   736.452533: tick_stop: success=no msg=more than 1 task in runqueue

           a.out-1314  [005] d.h.   736.452534: hrtimer_cancel: hrtimer=ffff88087fd4eca0
           a.out-1314  [005] d.h.   736.452535: hrtimer_start: hrtimer=ffff88087fd4eca0 function=tick_sched_timer expires=736012000000 softexpires=736012000000
           a.out-1314  [005] d...   736.452536: tick_stop: success=no msg=more than 1 task in runqueue

           a.out-1314  [005] d...   736.452537: sched_switch: prev_comm=a.out prev_pid=1314 prev_prio=120 prev_state=x ==> next_comm=perf next_pid=1312 next_prio=120
            perf-1312  [005] d...   736.452647: timer_start: timer=ffffffff81d14ae0 function=delayed_work_timer_fn expires=4295076549 [timeout=250]
            perf-1312  [005] d.h.   736.455802: hrtimer_cancel: hrtimer=ffff88087fd4eca0

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