EventLog日志
前言：终端调试命令
adb logcat -b events # 会打印出EventLog信息一、ActivityManager
| Num | TagName | 格式 | 功能 |
|---|---|---|---|
| 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 | ANR |
| 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, Lru | |
| 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 | 杀进程 |
| 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, | timeout |
| 30039 | am_crash | User, PID, ProcessName, Flags, Exception, Message, File, Line | Crash |
| 30040 | am_wtf | User, PID, ProcessName, Flags, Tag, Message | Wtf |
| 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 | 内存 |
| 30047 | am_pss | Pid, UID, ProcessName, Pss, Uss | 进程 |
tag可能使用的部分场景：
am_low_memory：位于AMS.killAllBackgroundProcesses或者AMS.appDiedLocked，记录当前Lru进程队列长度。
am_pss：位于AMS.recordPssSampleLocked
am_meminfo：位于AMS.dumpApplicationMemoryUsage
am_proc_start:位于AMS.startProcessLocked，启动进程
am_proc_bound:位于AMS.attachApplicationLocked
am_kill: 位于ProcessRecord.kill，杀掉进程
am_anr: 位于AMS.appNotResponding
am_crash:位于AMS.handleApplicationCrashInner
am_wtf:位于AMS.handleApplicationWtf
am_activity_launch_time：位于ActivityRecord.reportLaunchTimeLocked()，后面两个参数分别是thisTime和 totalTime.
am_activity_fully_drawn_time:位于ActivityRecord.reportFullyDrawnLocked, 后面两个参数分别是thisTime和 totalTime
am_broadcast_discard_filter:位于BroadcastQueue.logBroadcastReceiverDiscardLocked
am_broadcast_discard_app:位于BroadcastQueue.logBroadcastReceiverDiscardLocked
Activity生命周期相关的方法:
am_on_resume_called: 位于AT.performResumeActivity
am_on_paused_called: 位于AT.performPauseActivity, performDestroyActivity
am_resume_activity: 位于AS.resumeTopActivityInnerLocked
am_pause_activity: 位于AS.startPausingLocked
am_finish_activity: 位于AS.finishActivityLocked, removeHistoryRecordsForAppLocked
am_destroy_activity: 位于AS.destroyActivityLocked
am_focused_activity: 位于AMS.setFocusedActivityLocked, clearFocusedActivity
am_restart_activity: 位于ASS.realStartActivityLocked
am_create_activity: 位于ASS.startActivityUncheckedLocked
am_new_intent: 位于ASS.startActivityUncheckedLocked
am_task_to_front: 位于AS.moveTaskToFrontLocked
二、Power
| Num | TagName | 格式 | 功能 |
|---|---|---|---|
| 2722 | battery_level | level, voltage, temperature | 电池电量、电压、温度信息 |
| 2723 | battery_status | status, health, present, plugged, technology | 电池状态、健康状况、是否插入、充电状态、电池类型 |
| 2730 | battery_discharge | duration, minLevel, maxLevel | 电池放电持续时间、最小电量水平、最大电量水平 |
| 2724 | power_sleep_requested | wakeLocksCleared | 睡眠请求，唤醒锁已清除的数量 |
| 2725 | power_screen_broadcast_send | wakelockCount | 屏幕广播发送，涉及的唤醒锁计数 |
| 2726 | power_screen_broadcast_done | on, broadcastDuration, wakelockCount | 屏幕广播完成，屏幕状态（开/关）、广播持续时间、唤醒锁计数 |
| 2727 | power_screen_broadcast_stop | which, wakelockCount | 屏幕广播停止，停止原因、涉及的唤醒锁计数，系统未完全就绪 |
| 2728 | power_screen_state | offOrOn, becauseOfUser, totalTouchDownTime, touchCycles | 屏幕开关状态、是否因用户操作、总触控按下时间、触控周期数 |
| 2729 | power_partial_wake_state | releasedorAcquired, tag | 部分唤醒状态变更，释放或获取、标签标识 |
battery_level: [19,3660,352] //剩余电量19%, 电池电压3.66v, 电池温度35.2℃
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)
power_screen_state: [1,0,0,0] // 亮屏状态(1)
列举tag可能使用的部分场景：
power_sleep_requested: 位于PMS.goToSleepNoUpdateLocked
power_screen_state:位于Notifer.handleEarlyInteractiveChange, handleLateInteractiveChange
三、EventLog完整语义分析
在源码EventLogTags.java中,有大量类似的定义,那么括号中数字是什么含义呢? (以进程启动为例)
30014 am_proc_start (User|1|5),(PID|1|5),(UID|1|5),(Process Name|3),(Type|3),(Component|3)am_proc_start之后紧跟着的几个括号，其中括号里的内容格式如下：
(<name>|data type[|data unit])
(<名字>|数据类型[|数据单位])四、数据类型
1: int 2: long 3: string 4: list
五、数据单位
1: Number of objects(对象个数) 2: Number of bytes(字节数) 3: Number of milliseconds(毫秒) 4: Number of allocations(分配个数) 5: Id 6: Percent(百分比)
六、实例解析
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]含义如下：
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
events_log中搜索“am_finish_activity”， 可以判断到底是APP自行结束的（正常结束，后面有app-request字样），还是被其他进程强制结束的(force-stop)