Android 读取系统日志

我知道以前有人问过这个问题，但我担心“systrace使用扩展ftrace的atrace，所以请在此处检查ftrace格式”对我来说是不够的。我想了解一些systrace特定标签/格式的更多细节。我有一些我没有信心的猜测，因此我需要一个真正了解它们的人来证实

下面是我在trace.html中找到的一些结果

# tracer: nop\n\
#\n\
# entries-in-buffer/entries-written: 393636/393636   #P:1\n\
#\n\
#                              _-----=> irqs-off\n\
#                             / _----=> need-resched\n\
#                            | / _---=> hardirq/softirq\n\
#                            || / _--=> preempt-depth\n\
#                            ||| /     delay\n\
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION\n\
#              | |       |   ||||       |         |\n\
          atrace-27768 [000] ...2 17184.509740: sched_switch: prev_comm=atrace prev_pid=27768 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120\n\
      Thread-117-16753 [001] ...1 17184.510251: tracing_mark_write: B|4237|eglSwapBuffers\n\
          <idle>-0     [000] d.h4 17184.510329: sched_wakeup: comm=AudioOut_2 pid=608 prio=101 success=1 target_cpu=000\n\
          <idle>-0     [000] ...2 17184.510338: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=AudioOut_2 next_pid=608 next_prio=101\n\
      AudioOut_2-608   [000] d..4 17184.510393: sched_wakeup: comm=AudioTrack pid=16778 prio=104 success=1 target_cpu=000\n\
      AudioOut_2-608   [000] ...2 17184.510446: sched_switch: prev_comm=AudioOut_2 prev_pid=608 prev_prio=101 prev_state=S ==> next_comm=AudioTrack next_pid=16778 next_prio=104\n\
      Thread-117-16753 [001] ...1 17184.510610: tracing_mark_write: B|4237|queueBuffer\n\
      Thread-117-16753 [001] d..4 17184.510648: sched_wakeup: comm=Binder_2 pid=189 prio=120 success=1 target_cpu=001\n\
      Thread-117-16753 [001] ...2 17184.510656: sched_switch: prev_comm=Thread-117 prev_pid=16753 prev_prio=120 prev_state=R+ ==> next_comm=Binder_2 next_pid=189 next_prio=120\n\
        Binder_2-189   [001] ...2 17184.510664: sched_switch: prev_comm=Binder_2 prev_pid=189 prev_prio=120 prev_state=D ==> next_comm=Thread-117 next_pid=16753 next_prio=120\n\
      Thread-117-16753 [001] d..4 17184.510670: sched_wakeup: comm=Binder_2 pid=189 prio=120 success=1 target_cpu=001\n\
      Thread-117-16753 [001] ...2 17184.510673: sched_switch: prev_comm=Thread-117 prev_pid=16753 prev_prio=120 prev_state=R+ ==> next_comm=Binder_2 next_pid=189 next_prio=120\n\
        Binder_2-189   [001] ...1 17184.510722: tracing_mark_write: B|147|queueBuffer\n\
        Binder_2-189   [001] ...1 17184.510729: tracing_mark_write: B|147|SurfaceView: 0\n\
        Binder_2-189   [001] ...1 17184.510734: tracing_mark_write: E\n\
        Binder_2-189   [001] ...1 17184.510753: tracing_mark_write: C|147|SurfaceView|1\n\
        Binder_2-189   [001] d..4 17184.510772: sched_wakeup: comm=EventThread pid=255 prio=111 success=1 target_cpu=001\n\
        Binder_2-189   [001] ...1 17184.510781: tracing_mark_write: E\n\
        Binder_2-189   [001] ...2 17184.510810: sched_switch: prev_comm=Binder_2 prev_pid=189 prev_prio=120 prev_state=S ==> next_comm=EventThread next_pid=255 next_prio=111\n\
     EventThread-255   [001] d..4 17184.510828: sched_wakeup: comm=DispSync pid=186 prio=111 success=1 target_cpu=001\n\
     EventThread-255   [001] ...1 17184.510840: tracing_mark_write: C|147|VsyncOn|1\n\
     EventThread-255   [001] ...2 17184.510852: sched_switch: prev_comm=EventThread prev_pid=255 prev_prio=111 prev_state=S ==> next_comm=DispSync next_pid=186 next_prio=111\n\
        DispSync-186   [001] ...2 17184.510867: sched_switch: prev_comm=DispSync prev_pid=186 prev_prio=111 prev_state=S ==> next_comm=Thread-117 next_pid=16753 next_prio=120\n\
      Thread-117-16753 [001] ...1 17184.510885: tracing_mark_write: E\n\
      Thread-117-16753 [001] ...1 17184.510893: tracing_mark_write: B|4237|query\n\
      Thread-117-16753 [001] ...1 17184.510899: tracing_mark_write: E\n\
      Thread-117-16753 [001] ...1 17184.510906: tracing_mark_write: B|4237|query\n\
      Thread-117-16753 [001] ...1 17184.510911: tracing_mark_write: E\n\
      Thread-117-16753 [001] ...1 17184.510924: tracing_mark_write: E\n\
      AudioTrack-16778 [000] d.h7 17184.510984: sched_wakeup: comm=FastMixer pid=330 prio=96 success=1 target_cpu=000\n\
      AudioTrack-16778 [000] ...2 17184.511000: sched_switch: prev_comm=AudioTrack prev_pid=16778 prev_prio=104 prev_state=R+ ==> next_comm=FastMixer next_pid=330 next_prio=96\n\
      Thread-117-16753 [001] ...1 17184.511012: tracing_mark_write: B|4237|dequeueBuffer\n\
      Thread-117-16753 [001] d..4 17184.511034: sched_wakeup: comm=Binder_1 pid=185 prio=120 success=1 target_cpu=001\n\
      Thread-117-16753 [001] ...2 17184.511041: sched_switch: prev_comm=Thread-117 prev_pid=16753 prev_prio=120 prev_state=R+ ==> next_comm=Binder_1 next_pid=185 next_prio=120\n\
        Binder_1-185   [001] ...2 17184.511053: sched_switch: prev_comm=Binder_1 prev_pid=185 prev_prio=120 prev_state=D ==> next_comm=Thread-117 next_pid=16753 next_prio=120\n\
      Thread-117-16753 [001] d..4 17184.511059: sched_wakeup: comm=Binder_1 pid=185 prio=120 success=1 target_cpu=001\n\
      Thread-117-16753 [001] ...2 17184.511062: sched_switch: prev_comm=Thread-117 prev_pid=16753 prev_prio=120 prev_state=R+ ==> next_comm=Binder_1 next_pid=185 next_prio=120\n\
       FastMixer-330   [000] ...2 17184.511070: sched_switch: prev_comm=FastMixer prev_pid=330 prev_prio=96 prev_state=S ==> next_comm=AudioTrack next_pid=16778 next_prio=104\n\
      AudioTrack-16778 [000] ...2 17184.511087: sched_switch: prev_comm=AudioTrack prev_pid=16778 prev_prio=104 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120\n\
        Binder_1-185   [001] ...1 17184.511093: tracing_mark_write: B|147|dequeueBuffer\n\
        Binder_1-185   [001] ...1 17184.511102: tracing_mark_write: B|147|SurfaceView: 1\n\
        Binder_1-185   [001] ...1 17184.511105: tracing_mark_write: E\n\
        Binder_1-185   [001] ...1 17184.511110: tracing_mark_write: E\n\
        Binder_1-185   [001] ...2 17184.511131: sched_switch: prev_comm=Binder_1 prev_pid=185 prev_prio=120 prev_state=S ==> next_comm=Thread-117 next_pid=16753 next_prio=120\n\
      Thread-117-16753 [001] ...1 17184.511143: tracing_mark_write: E\n\
          <idle>-0     [000] d.h4 17184.512011: sched_wakeup: comm=Thread-117 pid=16780 prio=120 success=1 target_cpu=000\n\
          <idle>-0     [000] ...2 17184.512021: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=Thread-117 next_pid=16780 next_prio=120\n\
      Thread-117-16780 [000] ...2 17184.512047: sched_switch: prev_comm=Thread-117 prev_pid=16780 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120\n\
          <idle>-0     [000] d.h4 17184.513414: sched_wakeup: comm=Thread-117 pid=17201 prio=120 success=1 target_cpu=000\n\
          <idle>-0     [000] ...2 17184.513425: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=Thread-117 next_pid=17201 next_prio=120\n\
      Thread-117-17201 [000] ...2 17184.513441: sched_switch: prev_comm=Thread-117 prev_pid=17201 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120\n\
      Thread-117-16753 [001] ...2 17184.516369: sched_switch: prev_comm=Thread-117 prev_pid=16753 prev_prio=120 prev_state=S ==> next_comm=swapper/1 next_pid=0 next_prio=120\n\
          <idle>-0     [000] d.h6 17184.517936: sched_wakeup: comm=kworker/0:3 pid=27267 prio=120 success=1 target_cpu=000\n\
          <idle>-0     [000] ...2 17184.517947: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=kworker/0:3 next_pid=27267 next_prio=120\n\
     kworker/0:3-27267 [000] ...2 17184.518045: sched_switch: prev_comm=kworker/0:3 prev_pid=27267 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120\n\
          <idle>-0     [000] d.h7 17184.520977: sched_wakeup: comm=FastMixer pid=330 prio=96 success=1 target_cpu=000\n\
          <idle>-0     [000] ...2 17184.520986: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=FastMixer next_pid=330 next_prio=96\n\
       FastMixer-330   [000] ...2 17184.521041: sched_switch: prev_comm=FastMixer prev_pid=330 prev_prio=96 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120\n\
          <idle>-0     [000] d.h6 17184.521117: sched_wakeup: comm=kworker/0:3 pid=27267 prio=120 success=1 target_cpu=000\n\
          <idle>-0     [000] ...2 17184.521122: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=kworker/0:3 next_pid=27267 next_prio=120\n\
     kworker/0:3-27267 [000] d..4 17184.521130: sched_wakeup: comm=hwc_eventmon pid=246 prio=100 success=1 target_cpu=000\n\
     kworker/0:3-27267 [000] ...2 17184.521135: sched_switch: prev_comm=kworker/0:3 prev_pid=27267 prev_prio=120 prev_state=S ==> next_comm=hwc_eventmon next_pid=246 next_prio=100\n\
    hwc_eventmon-246   [000] ...2 17184.521155: sched_switch: prev_comm=hwc_eventmon prev_pid=246 prev_prio=100 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120\n\
          <idle>-0     [000] d.s5 17184.521414: sched_wakeup: comm=cfinteractive pid=88 prio=0 success=1 target_cpu=000\n\
          <idle>-0     [000] ...2 17184.521420: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=cfinteractive next_pid=88 next_prio=0\n\
   cfinteractive-88    [000] ...2 17184.521440: sched_switch: prev_comm=cfinteractive prev_pid=88 prev_prio=0 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120\n\
          <idle>-0     [001] d.h4 17184.525814: sched_wakeup: comm=DispSync pid=186 prio=111 success=1 target_cpu=001\n\
          <idle>-0     [001] ...2 17184.525821: sched_switch: prev_comm=swapper/1 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=DispSync next_pid=186 next_prio=111\n\
        DispSync-186   [001] d..4 17184.525842: sched_wakeup: comm=EventThread pid=255 prio=111 success=1 target_cpu=001\n\
        DispSync-186   [001] ...2 17184.525851: sched_switch: prev_comm=DispSync prev_pid=186 prev_prio=111 prev_state=S ==> next_comm=EventThread next_pid=255 next_prio=111\n\
          <idle>-0     [000] d.h3 17184.525884: sched_wakeup: comm=surfaceflinger pid=147 prio=112 success=1 target_cpu=000\n\
          <idle>-0     [000] ...2 17184.525890: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=surfaceflinger next_pid=147 next_prio=112\n\
     EventThread-255   [001] ...2 17184.525892: sched_switch: prev_comm=EventThread prev_pid=255 prev_prio=111 prev_state=S ==> next_comm=swapper/1 next_pid=0 next_prio=120\n\

#跟踪器：nop\n\
#\n\
#缓冲区中的条目/写入的条目：393636/393636#P:1\n\
#\n\
#-----=>IRQ关闭\n\
#/\u---=>需要重新扫描\n\
#|/--=>hardirq/softirq\n\
#| |/|--=>抢占深度\n\
#| | | |/延迟\n\
#TASK-PID CPU#| | | |时间戳函数\n\
#| | | | | | | | \n\
atrace-27768[000]…2 17184.509740:sched_开关：上一个通信=下一个pid=下一个pid=下一个优先级=120\n\
线程-117-16753[001]…1 17184.510251:跟踪标记写入：B | 4237 | eglSwapBuffers\n\
-0[000]d.h4 17184.510329:sched_wakeup:comm=AudioOut_2 pid=608 prio=101 success=1 target_cpu=000\n\
-0[000]…2 17184.510338:sched_开关：prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R=>next_comm=AudioOut_2 next_pid=608 next_prio=101\n\
AudioOut_2-608[000]d..4 17184.510393:sched_wakeup:comm=AudioTrack pid=16778优先级=104成功=1目标_cpu=000\n\
AudioOut\u 2-608[000]…2 17184.510446:sched\u开关：上一个通信=下一个pid=16778下一个优先级=104\n\
Thread-117-16753[001]…1 17184.510610:跟踪标记写入：B | 4237 |队列缓冲区\n\
线程-117-16753[001]d..4 17184.510648:sched_wakeup:comm=Binder_2 pid=189 prio=120 success=1 target_cpu=001\n\
Thread-117-16753[001]…2 17184.510656:sched_开关：prev_comm=Thread-117 prev_pid=16753 prev_prio=120 prev_state=R+==>next_comm=Binder_2 next_pid=189 next_prio=120\n\
Binder_2-189[001]…2 17184.510664:sched_开关：prev_comm=Binder_2 prev_pid=189 prev_prio=120 prev_state=D==>next_comm=Thread-117 next_pid=16753 next_prio=120\n\
线程-117-16753[001]d..4 17184.510670:sched_wakeup:comm=Binder_2 pid=189 prio=120 success=1 target_cpu=001\n\
Thread-117-16753[001]…2 17184.510673:sched_开关：prev_comm=Thread-117 prev_pid=16753 prev_prio=120 prev_state=R+==>next_comm=Binder_2 next_pid=189 next_prio=120\n\
活页夹2-189[001]…1 17184.510722:跟踪标记写入：B | 147 |队列缓冲区\n\
活页夹2-189[001]…1 17184.510729:跟踪标记写入：B | 147 |表面查看：0\n\
活页夹\u 2-189[001]…1 17184.510734:跟踪\u标记\u写入：E\n\
活页夹2-189[001]…1 17184.510753：跟踪标记写入：C | 147 | SurfaceView | 1\n\
Binder_2-189[001]d..4 17184.510772:sched_唤醒：comm=EventThread pid=255 prio=111 success=1 target_cpu=001\n\
活页夹\u 2-189[001]…1 17184.510781:跟踪\u标记\u写入：E\n\
Binder_2-189[001]…2 17184.510810:sched_开关：prev_comm=Binder_2 prev_pid=189 prev_prio=120 prev_state=S===>next_comm=EventThread next_pid=255 next_prio=111\n\
EventThread-255[001]d..4 17184.510828:sched_wakeup:comm=DispSync pid=186 prio=111 success=1 target_cpu=001\n\
EventThread-255[001]…1 17184.510840:跟踪标记写入：C | 147 | VsyncOn | 1\n\
EventThread-255[001]…2 17184.510852:sched_开关：prev_comm=EventThread prev_pid=255 prev_prio=111 prev_state=S=>next_comm=DispSync next_pid=186 next_prio=111\n\
DispSync-186[001]…2 17184.510867:sched_开关：prev_comm=DispSync prev_pid=186 prev_prio=111 prev_state=S=>next_comm=Thread-117 next_pid=16753 next_prio=120\n\
线程-117-16753[001]…1 17184.510885:跟踪标记写入：E\n\
Thread-117-16753[001]…1 17184.510893:跟踪标记写入：B | 4237 |查询\n\
线程-117-16753[001]…1 17184.510899:跟踪标记写入：E\n\
Thread-117-16753[001]…1 17184.510906:跟踪标记写入：B | 4237 |查询\n\
线程-117-16753[001]…1 17184.510911:跟踪标记写入：E\n\
线程-117-16753[001]…1 17184.510924:跟踪标记写入：E\n\
AudioTrack-16778[000]d.h7 17184.510984:sched_wakeup:comm=FastMixer pid=330 prio=96 success=1 target_cpu=000\n\
AudioTrack-16778[000]…2 17184.511000:sched_开关：prev_comm=AudioTrack prev_pid=16778 prev_prio=104 prev_state=R+==>next_comm=快速混音器next_pid=330 next_prio=96\n\
Thread-117-16753[001]…1 17184.511012:跟踪标记写入：B | 4237 |出列缓冲区\n\
线程-117-16753[001]d..4 17184.511034:sched_wakeup:comm=Binder_1 pid=185 prio=120 success=1 target_cpu=001\n\
Thread-117-16753[001]…2 17184.511041:sched_开关：prev_comm=Thread-117 prev_pid=16753 prev_prio=120 prev_state=R+==>next_comm=Binder_1 next_pid=185 next_prio=120\n\
活页夹1-185[001]…2 17184.511053:sched_开关：上一个通信=活页夹1上一个pid=185上一个优先级=120上一个状态=D=>下一个通信=线程-117下一个pid=16753下一个优先级=120\n\
线程-117-16753[001]d..4 17184.511059:sched_wakeup:comm=Binder_1 pid=185 prio=120 success=1 target_cpu=001\n\
Thread-117-16753[001]…2 17184.511062:sched_开关：prev_comm=Thread-117 prev_pid=16753 prev_prio=120 prev_state=R+==>next_comm=Binder_1 next_pid=185 next_prio=120\n\
快速混音器-330[000]…2 17184.511070:sched_开关：prev_comm=快速混音器prev_pid=330 prev_prio=96 prev_state=S==>next_comm=AudioTrack next_pid=16778 next_prio=104\n\
AudioTrack-16778[000]…2 17184.511087:sched_开关：prev_comm=AudioTrack prev_pid=16778 prev_prio=104 prev_state=S===>next_comm=swapper/0 next_pid=0 next_prio=120\n\
活页夹1-185[001]…1 17184.511093:跟踪标记写入：B | 147 |出列缓冲区\n\
活页夹_1-185[001]。。
        Binder_1-185   [001] ...2 17184.511131: sched_switch: prev_comm=Binder_1 prev_pid=185 prev_prio=120 prev_state=S ==> next_comm=Thread-117 next_pid=16753 next_prio=120\n\
      Thread-117-16753 [001] ...1 17184.511143: tracing_mark_write: E\n\
          <idle>-0     [000] d.h4 17184.512011: sched_wakeup: comm=Thread-117 pid=16780 prio=120 success=1 target_cpu=000\n\
          <idle>-0     [000] ...2 17184.512021: sched_switch: prev_comm=swapper/0 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=Thread-117 next_pid=16780 next_prio=120\n\
      Thread-117-16780 [000] ...2 17184.512047: sched_switch: prev_comm=Thread-117 prev_pid=16780 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120\n\

   D    uninterruptible sleep (usually IO)
   R    running or runnable (on run queue)
   S    interruptible sleep (waiting for an event to complete)
   ...