Bootchart2

Use bootchart2 to profile system boot or a running system.

Configure bootchart2

1. Add the bootchart2 package to your device.
2. Add the following kernel command line parameters: initcall_debug printk.time=y quiet

Profile system boot

1. add the following kernel command line parameter: PMOS_BOOTCHART2.
2. (optional) modify EXIT_PROC in /etc/bootchartd.conf to define when the collector is to stop.
3. Boot the system.
   • mkinitfs will start /sbin/bootchartd.
   • /sbin/bootchartd will run /sbin/init.
   • Approximately 20 seconds after sshd starts (if using the default value of EXIT_PROC), the collector will exit.
   • /usr/bin/pybootchartgui will create a visualization in /var/log/bootchart.png.

Profile a running system

1. Use the command /sbin/bootchartd start (as root) to start profiling
2. Execute the commands or perform the activity that you want to profile.
3. Use the command /sbin/bootchartd stop (as root) to stop profiling
   • /usr/bin/pybootchartgui will create a visualization in /var/log/bootchart.png.

Example (QEMU)

This example demonstrates how to use bootchart2 with device-qemu-amd64.

1. Run pmbootstrap init. At the Extra packages prompt, enter bootchart2.

   > pmbootstrap init

   [18:46:26] Location of the 'work' path. Multiple chroots (native, device arch, device rootfs) will be created in there.

   ...

   [18:46:29] Choose your target device vendor (either an existing one, or a new one for porting).

   [18:46:29] Available vendors (43): amazon, asus, bq, chuwi, fairphone, finepower, google, gp, hisense, htc, huawei, infocus, jolla, leeco, lenovo, lg, medion, meizu, motorola, nextbit, nobby, nokia, oneplus, oppo, ouya, pine64, planet, purism, qemu, raspberry, samsung, semc, sony, surftab, t2m, tablet, teclast, wiko, wileyfox, wingtech, xiaomi, yu, zte

   [18:46:29] Vendor [qemu]:

   [18:46:30] Available codenames (3): aarch64, amd64, vexpress

   [18:46:30] Device codename [amd64]:

   ...

   [18:46:35] Additional packages that will be installed to rootfs. Specify them in a comma separated list (e.g.: vim,file) or "none"

   [18:46:35] Extra packages [none]: bootchart2

   ...

   [18:46:40] Done!

   >

2. Run pmbootstrap install.
3. Start qemu. Use the kernel command line parameters from the deviceinfo file, and add the bootchart2 parameters. For example:

   pmbootstrap qemu --image-size=2G --host-qemu --display=gtk --cmdline 'PMOS_BOOTCHART2 initcall_debug printk.time=y quiet console=tty1 console=ttyS0 PMOS_NO_OUTPUT_REDIRECT PMOS_FORCE_PARTITION_RESIZE'

4. Wait until bootchart2 has written the image to /var/log/bootchart.png.

   

5. Copy the file to your host system (scp -P 2222 <qemu username>@localhost:/var/log/bootchart.png .).