【Android日志分析】EventLog
Android源码中有大量的EventLog日志，通过这个日志可以很简洁的呈现出系统的事件处理流程，包括时间，状态，便于我们分析定位问题。
- 命令
查看Event所有的tags
adb shell cat /system/etc/event-log-tags
输出events日志信息
adb logcat -b events
该命令会输出带有时间点、进程号等信息的events log
adb logcat -v threadtime -t 4096 -b events- EventLogs完整语义分析
30014 am_proc_start (User|1|5),(PID|1|5),(UID|1|5),(Process Name|3),(Type|3),(Component|3)
格式：(|data type[|data unit]) ==> (<名字>|数据类型[|数据单位])
例子：(User|1|5) ==> 名字为User, 数据类型为1，数据单位为5，下面再来看看数据类型和数据单位
数据类型：1：int，2：long，3：string，4：list
数据单位：1：对象个数，2：字节数，3：毫秒，4：分配个数，5：ID，6百分比
实例分析：
am_proc_start (User|1|5),(PID|1|5),(UID|1|5),(Process Name|3),(Type|3),(Component|3) am_proc_start: [0,9227,10002,com.android.browser,content provider,com.android.browser/.provider.BrowserProvider2]
进程启动: UserId=0, pid=9227, uid=10002, ProcessName=com.android.browser,
数据类型=ContentProvider, 组件=com.android.browser/.provider.BrowserProvider2 更多格式参考下面的列表
- EventLogs格式整理
AM
30001 am_finish_activity User,Token,TaskID,ComponentName,Reason
30002 am_task_to_front User,Task
30003 am_new_intent User,Token,TaskID,ComponentName,Action,MIMEType,URI,Flags
30004 am_create_task User ,Task ID
30005 am_create_activity User ,Token ,TaskID ,ComponentName,Action,MIMEType,URI,Flags
30006 am_restart_activity User ,Token ,TaskID,ComponentName
30007 am_resume_activity User ,Token ,TaskID,ComponentName
30008 am_anr User ,pid ,Package Name,Flags ,reason
30009 am_activity_launch_time User ,Token ,ComponentName,time
30010 am_proc_bound User ,PID ,ProcessName
30011 am_proc_died User ,PID ,ProcessName
30012 am_failed_to_pause User ,Token ,Wanting to pause,Currently pausing
30013 am_pause_activity User ,Token ,ComponentName
30014 am_proc_start User ,PID ,UID ,ProcessName,Type,Component
30015 am_proc_bad User ,UID ,ProcessName
30016 am_proc_good User ,UID ,ProcessName
30017 am_low_memory NumProcesses
30018 am_destroy_activity User ,Token ,TaskID,ComponentName,Reason
30019 am_relaunch_resume_activity User ,Token ,TaskID,ComponentName
30020 am_relaunch_activity User ,Token ,TaskID,ComponentName
30021 am_on_paused_called User ,ComponentName
30022 am_on_resume_called User ,ComponentName
30023 am_kill User ,PID ,ProcessName,OomAdj ,Reason
30024 am_broadcast_discard_filter User ,Broadcast ,Action,ReceiverNumber,BroadcastFilter
30025 am_broadcast_discard_app User ,Broadcast ,Action,ReceiverNumber,App
30030 am_create_service User ,ServiceRecord ,Name,UID ,PID
30031 am_destroy_service User ,ServiceRecord ,PID
30032 am_process_crashed_too_much User ,Name,PID
30033 am_drop_process PID
30034 am_service_crashed_too_much User ,Crash Count,ComponentName,PID
30035 am_schedule_service_restart User ,ComponentName,Time
30036 am_provider_lost_process User ,Package Name,UID ,Name
30037 am_process_start_timeout User ,PID ,UID ,ProcessName
30039 am_crash User ,PID ,ProcessName,Flags ,Exception,Message,File,Line
30040 am_wtf User ,PID ,ProcessName,Flags ,Tag,Message
30041 am_switch_user id
30042 am_activity_fully_drawn_time User ,Token ,ComponentName,time
30043 am_focused_activity User ,ComponentName
30044 am_home_stack_moved User ,To Front ,Top Stack Id ,Focused Stack Id ,Reason
30045 am_pre_boot User ,Package
30046 am_meminfo Cached,Free,Zram,Kernel,Native
30047 am_pss Pid, UID, ProcessName, Pss, Uss
Power
2722 battery_level level, voltage, temperature
battery_level: [19,3660,352] //剩余电量19%, 电池电压3.66v, 电池温度35.2℃
2723 battery_status status,health,present,plugged,technology
2730 battery_discharge duration, minLevel,maxLevel
2724 power_sleep_requested wakeLocksCleared
2725 power_screen_broadcast_send wakelockCount
2726 power_screen_broadcast_done on, broadcastDuration, wakelockCount
2727 power_screen_broadcast_stop which,wakelockCount
2728 power_screen_state offOrOn, becauseOfUser, totalTouchDownTime, touchCycles
power_screen_state: [0,3,0,0] // 灭屏状态(0), 屏幕超时(3). 当然还有其他设备管理策略(1),其他理由都为用户行为(2)
2729 power_partial_wake_state releasedorAcquired, tag
后续会继续补充...- 各个TAG使用的一些场景
| TAG | 位置 |
| am_low_memory | AMS.killAllBackgroundProcesses或者AMS.appDiedLocked，记录当前Lru进程队列长度 |
| am_pss | AMS.recordPssSampleLocked |
| am_meminfo | AMS.dumpApplicationMemoryUsage |
| am_proc_start | AMS.startProcessLocked |
| am_proc_bound | AMS.attachApplicationLocked |
| am_kill | ProcessRecord.kill，杀掉进程 |
| am_anr | AMS.appNotResponding |
| am_crash | AMS.handleApplicationCrashInner |
| am_wtf | AMS.handleApplicationWtf |
| am_activity_launch_time | ActivityRecord.reportLaunchTimeLocked()，后面两个参数分别是thisTime和 totalTime |
| am_activity_fully_drawn_time | ActivityRecord.reportFullyDrawnLocked, 后面两个参数分别是thisTime和 totalTime |
| am_broadcast_discard_filter | BroadcastQueue.logBroadcastReceiverDiscardLocked |
| am_broadcast_discard_app | BroadcastQueue.logBroadcastReceiverDiscardLocked |
| am_on_resume_called | AT.performResumeActivity |
| am_on_paused_called | AT.performPauseActivity, performDestroyActivity |
| am_resume_activity | AS.resumeTopActivityInnerLocked |
| am_pause_activity | AS.startPausingLocked |
| am_finish_activity | AS.finishActivityLocked, removeHistoryRecordsForAppLocked |
| am_destroy_activity | AS.destroyActivityLocked |
| am_focused_activity | AMS.setFocusedActivityLocked, clearFocusedActivity |
| am_restart_activity | ASS.realStartActivityLocked |
| am_create_activity | ASS.startActivityUncheckedLocked |
| am_new_intent | ASS.startActivityUncheckedLocked |
| am_task_to_front | AS.moveTaskToFrontLocked |
先整理这些，后续会继续补充，主要是为了便于自己记录使用
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