Android系统日志和工具
我们经常需要查看设备里面的各种日志信息。所以有必要了解android系统里面有哪些日志，以及用什么方式可以提取这些日志。以我手头的红米note4xplus为例，其基本配置为高通msm8953,android7.0。我们可以看一下根文件系统：
mido:/ # ls
acct init.carrier.rc init.qcom.sh root
bin init.class_main.sh init.qcom.syspart_fixup.sh sbin
bt_firmware init.environ.rc init.qcom.usb.rc sdcard
cache init.mdm.sh init.qcom.usb.sh seapp_contexts
charger init.miui.cust.rc init.rc selinux_version
config init.miui.early_boot.sh init.recovery.hardware.rc sepolicy
cust init.miui.google_revenue_share.rc init.target.rc service_contexts
d init.miui.google_revenue_share_v2.rc init.usb.configfs.rc storage
data init.miui.nativedebug.rc init.usb.rc sys
default.prop init.miui.post_boot.sh init.zygote32.rc system
dev init.miui.rc init.zygote64_32.rc tombstones
dsp init.msm.usb.configfs.rc mnt ueventd.qcom.rc
etc init.qcom.class_core.sh oem ueventd.rc
file_contexts.bin init.qcom.early_boot.sh persist unlock_key
firmware init.qcom.factory.rc proc vendor
fstab.qcom init.qcom.rc property_contexts verity_key
init init.qcom.sensors.sh res
以这个设备的文件系统为基础，我们来看一下一般的android设备中都有那些系统日志。
本文档只做日志相关的概要说明，不具体说明每个工具的使用方法。
android设备默认的命令一般都在/system/bin, /system/xbin和/sbin目录下。我们选择几个常用的命令来做个说明。
atrace
实际上就是systrace的代理。用来抓取用户空间服务日志信息。
一般用法：
adb shell atrace sched freq idle gfx view sync -b 96000 -f atrace.log
命令帮助：
adb shell atrace --help
usage: atrace [options] [categories...]
options include:
-a appname enable app-level tracing for a comma separated list of cmdlines
-b N use a trace buffer size of N KB
-c trace into a circular buffer
-f filename use the categories written in a file as space-separated
values in a line
-k fname,... trace the listed kernel functions
-n ignore signals
-s N sleep for N seconds before tracing [default 0]
-t N trace for N seconds [defualt 5]
-z compress the trace dump
--async_start start circular trace and return immediatly
--async_dump dump the current contents of circular trace buffer
--async_stop stop tracing and dump the current contents of circular
trace buffer
--stream stream trace to stdout as it enters the trace buffer
Note: this can take significant CPU time, and is best
used for measuring things that are not affected by
CPU performance, like pagecache usage.
--list_categories
list the available tracing categories
-o filename write the trace to the specified file instead
of stdout.
所有的业务类型列表：
adb shell atrace --list_categories
gfx - Graphics
input - Input
view - View System
webview - WebView
wm - Window Manager
am - Activity Manager
sm - Sync Manager
audio - Audio
video - Video
camera - Camera
hal - Hardware Modules
app - Application
res - Resource Loading
dalvik - Dalvik VM
rs - RenderScript
bionic - Bionic C Library
power - Power Management
pm - Package Manager
ss - System Server
database - Database
sched - CPU Scheduling
irq - IRQ Events
freq - CPU Frequency
idle - CPU Idle
disk - Disk I/O
mmc - eMMC commands
load - CPU Load
sync - Synchronization
workq - Kernel Workqueues
memreclaim - Kernel Memory Reclaim
regulators - Voltage and Current Regulators
binder_driver - Binder Kernel driver
binder_lock - Binder global lock trace
pagecache - Page cache
bootstat
查看设备启动状态信息。
`
adb shell bootstat -p
Boot events:
Original: https://www.cnblogs.com/aosp/p/16411738.html
Author: 河东西望
Title: Android系统中有哪些日志信息和工具
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