[Android]bootchart

1. PC tools

$ sudo apt-get install bootchart  $ sudo apt-get install pybootchartgui

2.Rebuild Android

//modify system/core/init/bootchart.h#ifndef BOOTCHART#define  BOOTCHART  1 //"1"means enable #endif

$export INIT_BOOTCHART=true#Make sure the flag will NOT be overrided#and then recompile init.#mmm system/core/$make bootimage#Then flash the image and reboot

3.Config the bootchart

# config duration$ adb shell 'echo 120 > /data/bootchart-start'

#config saved file path$ adb shell 'mkdir /data/bootchart'

4. reboot

5. parse data

#pull the bootchart log from /data/bootchartsystem/core/init/grab-bootchart.sh

#export as a png$bootchart ./bootchart.tgz