|This version of init contains code to perform "bootcharting", i.e. generating log
|files that can be later processed by the tools provided by www.bootchart.org.
|To activate it, you need to define build 'init' with the INIT_BOOTCHART environment
|variable defined to 'true', for example:
| touch system/init/init.c
| m INIT_BOOTCHART=true
|On the emulator, use the new -bootchart <timeout> option to boot with bootcharting
|activated for <timeout> seconds.
|Otherwise, flash your device, and start it. Then create a file on the /data partition
|with a command like the following:
| adb shell 'echo $TIMEOUT > /data/bootchart-start'
|Where the value of $TIMEOUT corresponds to the wanted bootcharted period in seconds;
|for example, to bootchart for 2 minutes, do:
| adb shell 'echo 120 > /data/bootchart-start'
|Reboot your device, bootcharting will begin and stop after the period you gave.
|You can also stop the bootcharting at any moment by doing the following:
| adb shell 'echo 1 > /data/bootchart-stop'
|Note that /data/bootchart-stop is deleted automatically by init at the end of the
|bootcharting. This is not the case of /data/bootchart-start, so don't forget to delete it
|when you're done collecting data:
| adb shell rm /data/bootchart-start
|The log files are placed in /data/bootchart/. you must run the script tools/grab-bootchart.sh
|which will use ADB to retrieve them and create a bootchart.tgz file that can be used with
|the bootchart parser/renderer, or even uploaded directly to the form located at:
|NOTE: the bootchart.org webform doesn't seem to work at the moment, you can generate an
| image on your machine by doing the following:
| 1/ download the sources from www.bootchart.org
| 2/ unpack them
| 3/ in the source directory, type 'ant' to build the bootchart program
| 4/ type 'java -jar bootchart.jar /path/to/bootchart.tgz
|this implementation of bootcharting does use the 'bootchartd' script provided by
|www.bootchart.org, but a C re-implementation that is directly compiled into our init