Android Log Tag含义
在分析Android问题的时候重要的手段之一就是分析log，在events.log中有很多系统log，其中有些log的含义并不是很了解，下面就是从安卓源码中得到的系统log的tag。
关于Tag的说明如下：以 “30005 am_create_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Action|3),(MIME Type|3),(URI|3),(Flags|1|5)” 为例，
其中：
- 30005 ：相当于是am_create_activity这个tag的索引或者标识。不会出现在events.txt中。
- am_create_activity：TAG名字
- 后面用()括起来的相当于是这个log的一些信息，以(User|1|5)为例，User表示信息名字，User表示UID，1表示在打印出的log中该信息的数据类型，5表示该数据的单位。
数据类型有：
- 1：int
- 2：long
- 3：string
- 4：list
- 5：float
数据的单位有：
- 1：Number of objects
- 2：Number of bytes
- 3：Number of milliseconds
- 4：Number of allocations
- 5：Id
- 6：Percent
所以(User|1|5)表示的意思是：这项信息表示的是User，在Linux即相当于UID，信息的数据类型为1，即int，数据的单位为5，即Id。其他的类似。
一个实际的log如下：
10-31 17:53:38.288 1232 2211 I am_create_activity: [0,208381599,127,cn.company.photoeditor/com.android.gallery3d.filtershow.FilterShowActivity,android.intent.action.EDIT,image/*,content://media/external/images/media/4427,1]，表示的含义即为：
- 这是一个表示activity创建的log
- 程序的UID为0
- 要创建的该activity的TOKEN为208381599
- 该动作所处的Task ID为127
- 所要创建的activity组件名为 cn.company.photoeditor/com.android.gallery3d.filtershow.FilterShowActivity
- 创建该activity消息中的action为android.intent.action.EDIT，MIME TYPE为image/*，URI为content://media/external/images/media/4427，附带的flag为1
下面是源码的中tag定义文件：
service/core/java/com/android/server/am/EventLogTags.logtags：
# See system/core/logcat/event.logtags for a description of the format of this file.
option java_package com.android.server.am
2719 configuration_changed (config mask|1|5)
2721 cpu (total|1|6),(user|1|6),(system|1|6),(iowait|1|6),(irq|1|6),(softirq|1|6)
# ActivityManagerService.systemReady() starts:
3040 boot_progress_ams_ready (time|2|3)
# ActivityManagerService calls enableScreenAfterBoot():
3050 boot_progress_enable_screen (time|2|3)
# Do not change these names without updating the checkin_events setting in
# google3/googledata/wireless/android/provisioning/gservices.config !!
#
# An activity is being finished:
30001 am_finish_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Reason|3)
# A task is being brought to the front of the screen:
30002 am_task_to_front (User|1|5),(Task|1|5)
# An existing activity is being given a new intent:
30003 am_new_intent (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Action|3),(MIME Type|3),(URI|3),(Flags|1|5)
# A new task is being created:
30004 am_create_task (User|1|5),(Task ID|1|5)
# A new activity is being created in an existing task:
30005 am_create_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Action|3),(MIME Type|3),(URI|3),(Flags|1|5)
# An activity has been resumed into the foreground but was not already running:
30006 am_restart_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3)
# An activity has been resumed and is now in the foreground:
30007 am_resume_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3)
# Application Not Responding
30008 am_anr (User|1|5),(pid|1|5),(Package Name|3),(Flags|1|5),(reason|3)
# Activity launch time
30009 am_activity_launch_time (User|1|5),(Token|1|5),(Component Name|3),(time|2|3)
# Application process bound to work
30010 am_proc_bound (User|1|5),(PID|1|5),(Process Name|3)
# Application process died
30011 am_proc_died (User|1|5),(PID|1|5),(Process Name|3)
# The Activity Manager failed to pause the given activity.
30012 am_failed_to_pause (User|1|5),(Token|1|5),(Wanting to pause|3),(Currently pausing|3)
# Attempting to pause the current activity
30013 am_pause_activity (User|1|5),(Token|1|5),(Component Name|3)
# Application process has been started
30014 am_proc_start (User|1|5),(PID|1|5),(UID|1|5),(Process Name|3),(Type|3),(Component|3)
# An application process has been marked as bad
30015 am_proc_bad (User|1|5),(UID|1|5),(Process Name|3)
# An application process that was bad is now marked as good
30016 am_proc_good (User|1|5),(UID|1|5),(Process Name|3)
# Reporting to applications that memory is low
30017 am_low_memory (Num Processes|1|1)
# An activity is being destroyed:
30018 am_destroy_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Reason|3)
# An activity has been relaunched, resumed, and is now in the foreground:
30019 am_relaunch_resume_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3)
# An activity has been relaunched:
30020 am_relaunch_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3)
# The activity's onPause has been called.
30021 am_on_paused_called (User|1|5),(Component Name|3),(Reason|3)
# The activity's onResume has been called.
30022 am_on_resume_called (User|1|5),(Component Name|3),(Reason|3)
# Kill a process to reclaim memory.
30023 am_kill (User|1|5),(PID|1|5),(Process Name|3),(OomAdj|1|5),(Reason|3)
# Discard an undelivered serialized broadcast (timeout/ANR/crash)
30024 am_broadcast_discard_filter (User|1|5),(Broadcast|1|5),(Action|3),(Receiver Number|1|1),(BroadcastFilter|1|5)
30025 am_broadcast_discard_app (User|1|5),(Broadcast|1|5),(Action|3),(Receiver Number|1|1),(App|3)
# A service is being created
30030 am_create_service (User|1|5),(Service Record|1|5),(Name|3),(UID|1|5),(PID|1|5)
# A service is being destroyed
30031 am_destroy_service (User|1|5),(Service Record|1|5),(PID|1|5)
# A process has crashed too many times, it is being cleared
30032 am_process_crashed_too_much (User|1|5),(Name|3),(PID|1|5)
# An unknown process is trying to attach to the activity manager
30033 am_drop_process (PID|1|5)
# A service has crashed too many times, it is being stopped
30034 am_service_crashed_too_much (User|1|5),(Crash Count|1|1),(Component Name|3),(PID|1|5)
# A service is going to be restarted after its process went away
30035 am_schedule_service_restart (User|1|5),(Component Name|3),(Time|2|3)
# A client was waiting for a content provider, but its process was lost
30036 am_provider_lost_process (User|1|5),(Package Name|3),(UID|1|5),(Name|3)
# The activity manager gave up on a new process taking too long to start
30037 am_process_start_timeout (User|1|5),(PID|1|5),(UID|1|5),(Process Name|3)
# Unhandled exception
30039 am_crash (User|1|5),(PID|1|5),(Process Name|3),(Flags|1|5),(Exception|3),(Message|3),(File|3),(Line|1|5)
# Log.wtf() called
30040 am_wtf (User|1|5),(PID|1|5),(Process Name|3),(Flags|1|5),(Tag|3),(Message|3)
# User switched
30041 am_switch_user (id|1|5)
# Activity fully drawn time
30042 am_activity_fully_drawn_time (User|1|5),(Token|1|5),(Component Name|3),(time|2|3)
# Activity focused
30043 am_focused_activity (User|1|5),(Component Name|3),(Reason|3)
# Stack focus
30044 am_focused_stack (User|1|5),(Focused Stack Id|1|5),(Last Focused Stack Id|1|5),(Reason|3)
# Running pre boot receiver
30045 am_pre_boot (User|1|5),(Package|3)
# Report collection of global memory state
30046 am_meminfo (Cached|2|2),(Free|2|2),(Zram|2|2),(Kernel|2|2),(Native|2|2)
# Report collection of memory used by a process
30047 am_pss (Pid|1|5),(UID|1|5),(Process Name|3),(Pss|2|2),(Uss|2|2),(SwapPss|2|2)
# Attempting to stop an activity
30048 am_stop_activity (User|1|5),(Token|1|5),(Component Name|3)
# The activity's onStop has been called.
30049 am_on_stop_called (User|1|5),(Component Name|3),(Reason|3)
# Report changing memory conditions (Values are ProcessStats.ADJ_MEM_FACTOR* constants)
30050 am_mem_factor (Current|1|5),(Previous|1|5)
services/core/java/com/android/server/EventLogTags.logtags：
# See system/core/logcat/event.logtags for a description of the format of this file.
option java_package com.android.server
# ---------------------------
# BatteryService.java
# ---------------------------
2722 battery_level (level|1|6),(voltage|1|1),(temperature|1|1)
2723 battery_status (status|1|5),(health|1|5),(present|1|5),(plugged|1|5),(technology|3)
# This is logged when battery goes from discharging to charging.
# It lets us count the total amount of time between charges and the discharge level
2730 battery_discharge (duration|2|3),(minLevel|1|6),(maxLevel|1|6)
# ---------------------------
# PowerManagerService.java
# ---------------------------
# This is logged when the device is being forced to sleep (typically by
# the user pressing the power button).
2724 power_sleep_requested (wakeLocksCleared|1|1)
# This is logged when the screen on broadcast has completed
2725 power_screen_broadcast_send (wakelockCount|1|1)
# This is logged when the screen broadcast has completed
2726 power_screen_broadcast_done (on|1|5),(broadcastDuration|2|3),(wakelockCount|1|1)
# This is logged when the screen on broadcast has completed
2727 power_screen_broadcast_stop (which|1|5),(wakelockCount|1|1)
# This is logged when the screen is turned on or off.
2728 power_screen_state (offOrOn|1|5),(becauseOfUser|1|5),(totalTouchDownTime|2|3),(touchCycles|1|1)
# This is logged when the partial wake lock (keeping the device awake
# regardless of whether the screen is off) is acquired or released.
2729 power_partial_wake_state (releasedorAcquired|1|5),(tag|3)
# The device is being asked to go into a soft sleep (typically by the ungaze gesture).
# It logs the time remaining before the device would've normally gone to sleep without the request.
2731 power_soft_sleep_requested (savedwaketimems|2)
#
# Leave IDs through 2739 for more power logs (2730 used by battery_discharge above)
#
# ---------------------------
# DeviceStorageMonitorService.java
# ---------------------------
# The disk space free on the /data partition, in bytes
2744 free_storage_changed (data|2|2)
# Device low memory notification and disk space free on the /data partition, in bytes at that time
2745 low_storage (data|2|2)
# disk space free on the /data, /system, and /cache partitions in bytes
2746 free_storage_left (data|2|2),(system|2|2),(cache|2|2)
# file on cache partition was deleted
2748 cache_file_deleted (path|3)
# ---------------------------
# NotificationManagerService.java
# ---------------------------
# when a NotificationManager.notify is called. status: 0=post, 1=update, 2=ignored
2750 notification_enqueue (uid|1|5),(pid|1|5),(pkg|3),(id|1|5),(tag|3),(userid|1|5),(notification|3),(status|1)
# when someone tries to cancel a notification, the notification manager sometimes
# calls this with flags too
2751 notification_cancel (uid|1|5),(pid|1|5),(pkg|3),(id|1|5),(tag|3),(userid|1|5),(required_flags|1),(forbidden_flags|1),(reason|1|5),(listener|3)
# when someone tries to cancel all of the notifications for a particular package
2752 notification_cancel_all (uid|1|5),(pid|1|5),(pkg|3),(userid|1|5),(required_flags|1),(forbidden_flags|1),(reason|1|5),(listener|3)
# when the notification panel is shown
# Note: New tag range starts here since 2753+ have been used below.
27500 notification_panel_revealed (items|1)
# when the notification panel is hidden
27501 notification_panel_hidden
# when notifications are newly displayed on screen, or disappear from screen
27510 notification_visibility_changed (newlyVisibleKeys|3),(noLongerVisibleKeys|3)
# when notifications are expanded, or contracted
27511 notification_expansion (key|3),(user_action|1),(expanded|1),(lifespan|1),(freshness|1),(exposure|1)
# when a notification has been clicked
27520 notification_clicked (key|3),(lifespan|1),(freshness|1),(exposure|1)
# when a notification action button has been clicked
27521 notification_action_clicked (key|3),(action_index|1),(lifespan|1),(freshness|1),(exposure|1)
# when a notification has been canceled
27530 notification_canceled (key|3),(reason|1),(lifespan|1),(freshness|1),(exposure|1)
# replaces 27510 with a row per notification
27531 notification_visibility (key|3),(visibile|1),(lifespan|1),(freshness|1),(exposure|1),(rank|1)
# a notification emited noise, vibration, or light
27532 notification_alert (key|3),(buzz|1),(beep|1),(blink|1)
# a notification was added to a autogroup
27533 notification_autogrouped (key|3)
# notification was removed from an autogroup
275534 notification_unautogrouped (key|3)
# ---------------------------
# Watchdog.java
# ---------------------------
2802 watchdog (Service|3)
2803 watchdog_proc_pss (Process|3),(Pid|1|5),(Pss|1|2)
2804 watchdog_soft_reset (Process|3),(Pid|1|5),(MaxPss|1|2),(Pss|1|2),(Skip|3)
2805 watchdog_hard_reset (Process|3),(Pid|1|5),(MaxPss|1|2),(Pss|1|2)
2806 watchdog_pss_stats (EmptyPss|1|2),(EmptyCount|1|1),(BackgroundPss|1|2),(BackgroundCount|1|1),(ServicePss|1|2),(ServiceCount|1|1),(VisiblePss|1|2),(VisibleCount|1|1),(ForegroundPss|1|2),(ForegroundCount|1|1),(NoPssCount|1|1)
2807 watchdog_proc_stats (DeathsInOne|1|1),(DeathsInTwo|1|1),(DeathsInThree|1|1),(DeathsInFour|1|1),(DeathsInFive|1|1)
2808 watchdog_scheduled_reboot (Now|2|1),(Interval|1|3),(StartTime|1|3),(Window|1|3),(Skip|3)
2809 watchdog_meminfo (MemFree|1|2),(Buffers|1|2),(Cached|1|2),(Active|1|2),(Inactive|1|2),(AnonPages|1|2),(Mapped|1|2),(Slab|1|2),(SReclaimable|1|2),(SUnreclaim|1|2),(PageTables|1|2)
2810 watchdog_vmstat (runtime|2|3),(pgfree|1|1),(pgactivate|1|1),(pgdeactivate|1|1),(pgfault|1|1),(pgmajfault|1|1)
2811 watchdog_requested_reboot (NoWait|1|1),(ScheduleInterval|1|3),(RecheckInterval|1|3),(StartTime|1|3),(Window|1|3),(MinScreenOff|1|3),(MinNextAlarm|1|3)
# ---------------------------
# BackupManagerService.java
# ---------------------------
2820 backup_data_changed (Package|3)
2821 backup_start (Transport|3)
2822 backup_transport_failure (Package|3)
2823 backup_agent_failure (Package|3),(Message|3)
2824 backup_package (Package|3),(Size|1|2)
2825 backup_success (Packages|1|1),(Time|1|3)
2826 backup_reset (Transport|3)
2827 backup_initialize
2828 backup_requested (Total|1|1),(Key-Value|1|1),(Full|1|1)
2829 backup_quota_exceeded (Package|3)
2830 restore_start (Transport|3),(Source|2|5)
2831 restore_transport_failure
2832 restore_agent_failure (Package|3),(Message|3)
2833 restore_package (Package|3),(Size|1|2)
2834 restore_success (Packages|1|1),(Time|1|3)
2840 full_backup_package (Package|3)
2841 full_backup_agent_failure (Package|3),(Message|3)
2842 full_backup_transport_failure
2843 full_backup_success (Package|3)
2844 full_restore_package (Package|3)
2845 full_backup_quota_exceeded (Package|3)
2850 backup_transport_lifecycle (Transport|3),(Bound|1|1)
# ---------------------------
# SystemServer.java
# ---------------------------
# SystemServer.run() starts:
3010 boot_progress_system_run (time|2|3)
# ---------------------------
# PackageManagerService.java
# ---------------------------
# Package Manager starts:
3060 boot_progress_pms_start (time|2|3)
# Package Manager .apk scan starts:
3070 boot_progress_pms_system_scan_start (time|2|3)
# Package Manager .apk scan starts:
3080 boot_progress_pms_data_scan_start (time|2|3)
# Package Manager .apk scan ends:
3090 boot_progress_pms_scan_end (time|2|3)
# Package Manager ready:
3100 boot_progress_pms_ready (time|2|3)
# + check activity_launch_time for Home app
# Value of "unknown sources" setting at app install time
3110 unknown_sources_enabled (value|1)
# Package Manager critical info
3120 pm_critical_info (msg|3)
# ---------------------------
# WindowManagerService.java
# ---------------------------
# Out of memory for surfaces.
31000 wm_no_surface_memory (Window|3),(PID|1|5),(Operation|3)
# Task created.
31001 wm_task_created (TaskId|1|5),(StackId|1|5)
# Task moved to top (1) or bottom (0).
31002 wm_task_moved (TaskId|1|5),(ToTop|1),(Index|1)
# Task removed with source explanation.
31003 wm_task_removed (TaskId|1|5),(Reason|3)
# Stack created.
31004 wm_stack_created (StackId|1|5)
# Home stack moved to top (1) or bottom (0).
31005 wm_home_stack_moved (ToTop|1)
# Stack removed.
31006 wm_stack_removed (StackId|1|5)
# bootanim finished:
31007 wm_boot_animation_done (time|2|3)
# ---------------------------
# InputMethodManagerService.java
# ---------------------------
# Re-connecting to input method service because we haven't received its interface
32000 imf_force_reconnect_ime (IME|4),(Time Since Connect|2|3),(Showing|1|1)
# ---------------------------
# WallpaperManagerService.java
# ---------------------------
33000 wp_wallpaper_crashed (component|3)
# ---------------------------
# Device idle
# ---------------------------
34000 device_idle (state|1|5), (reason|3)
34001 device_idle_step
34002 device_idle_wake_from_idle (is_idle|1|5), (reason|3)
34003 device_idle_on_start
34004 device_idle_on_phase (what|3)
34005 device_idle_on_complete
34006 device_idle_off_start (reason|3)
34007 device_idle_off_phase (what|3)
34008 device_idle_off_complete
34009 device_idle_light (state|1|5), (reason|3)
34010 device_idle_light_step
# ---------------------------
# DisplayManagerService.java
# ---------------------------
# Auto-brightness adjustments by the user.
35000 auto_brightness_adj (old_adj|5),(old_lux|5),(old_brightness|5),(old_gamma|5),(new_adj|5),(new_lux|5),(new_brightness|5),(new_gamma|5)
# ---------------------------
# ConnectivityService.java
# ---------------------------
# Connectivity state changed
50020 connectivity_state_changed (type|1),(subtype|1),(state|1)
# ---------------------------
# NetworkStatsService.java
# ---------------------------
51100 netstats_mobile_sample (dev_rx_bytes|2|2),(dev_tx_bytes|2|2),(dev_rx_pkts|2|1),(dev_tx_pkts|2|1),(xt_rx_bytes|2|2),(xt_tx_bytes|2|2),(xt_rx_pkts|2|1),(xt_tx_pkts|2|1),(uid_rx_bytes|2|2),(uid_tx_bytes|2|2),(uid_rx_pkts|2|1),(uid_tx_pkts|2|1),(trusted_time|2|3)
51101 netstats_wifi_sample (dev_rx_bytes|2|2),(dev_tx_bytes|2|2),(dev_rx_pkts|2|1),(dev_tx_pkts|2|1),(xt_rx_bytes|2|2),(xt_tx_bytes|2|2),(xt_rx_pkts|2|1),(xt_tx_pkts|2|1),(uid_rx_bytes|2|2),(uid_tx_bytes|2|2),(uid_rx_pkts|2|1),(uid_tx_pkts|2|1),(trusted_time|2|3)
# ---------------------------
# LockdownVpnTracker.java
# ---------------------------
51200 lockdown_vpn_connecting (egress_net|1)
51201 lockdown_vpn_connected (egress_net|1)
51202 lockdown_vpn_error (egress_net|1)
# ---------------------------
# ConfigUpdateInstallReceiver.java
# ---------------------------
51300 config_install_failed (dir|3)
# ---------------------------
# IntentFirewall.java
# ---------------------------
51400 ifw_intent_matched (Intent Type|1|5),(Component Name|3),(Caller Uid|1|5),(Caller Pkg Count|1|1),(Caller Pkgs|3),(Action|3),(MIME Type|3),(URI|3),(Flags|1|5)
# ---------------------------
# IdleMaintenanceService.java
# ---------------------------
51500 idle_maintenance_window_start (time|2|3), (lastUserActivity|2|3), (batteryLevel|1|6), (batteryCharging|1|5)
51501 idle_maintenance_window_finish (time|2|3), (lastUserActivity|2|3), (batteryLevel|1|6), (batteryCharging|1|5)
# ---------------------------
# MountService.java
# ---------------------------
2755 fstrim_start (time|2|3)
2756 fstrim_finish (time|2|3)
# ---------------------------
# AudioService.java
# ---------------------------
40000 volume_changed (stream|1), (prev_level|1), (level|1), (max_level|1), (caller|3)
40001 stream_devices_changed (stream|1), (prev_devices|1), (devices|1)
# ---------------------------
# GestureLauncherService.java
# ---------------------------
40100 camera_gesture_triggered (gesture_on_time|2|3), (sensor1_on_time|2|3), (sensor2_on_time|2|3), (event_extra|1|1)
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