Android bootchart (一)

  目的

本文档用于说明如何通过操作生成imx6 bootchart流程图，以便于做android系统启动优化。

bootchart用途

Bootchart is a system designed to show a graphical display of the activity of a system during boot.

Built-in Bootchart

Under android top level dir.

#export INIT_BOOTCHART=true

#touch system/core/init/init.cpp

Recompile android

How to enable bootchart

After burn new android system image:

Through adb tool login device

#echo 120  >  /data/bootchart/start

Then reboot system

Wait for 120s， login in devices

# cd  /data/bootchart

# tar zvf bootchart.tar.gz  *

Pull  bootchart.tar.gz  from device to local system.

adb pull /data/bootchart/bootchart.tar.gz  ./

Generate bootchart png file

Under ubuntu system

#apt install bootchart

#bootchart bootchart.tar.gz

/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:57: GtkWarning: could not open display

  warnings.warn(str(e), _gtk.Warning)

parsing 'bootchart.tar.gz'

parsing 'header'

parsing 'kernel_pacct'

parsing 'proc_diskstats.log'

parsing 'proc_ps.log'

warning: no parent for pid '2' with ppid '0'

warning: no parent for pid '4040' with ppid '0'

parsing 'proc_stat.log'

merged 0 logger processes

pruned 528 process, 0 exploders, 14 threads, and 1 runs

False

bootchart written to 'bootchart.png'