An example of getting started with Android ebpf. Using ebpf, on Android, print out the switching status of the process on the CPU.
一个Android ebpf的入门示例，利用ebpf，在Android上，打印出进程在CPU上的切换情况。
Build -> Install -> Reboot -> Run
After lunch project:
m cpu_stats.o
m cpu_stats_client
With adb rooted Android device:
adb push cpu_stats.o /system/etc/bpf
adb push cpu_stats_client /system/bin/
Reboot is needed.
In adb, run command:
cpu_stats_client
When the process is switched, print out the information of the process switched to the CPU core.
当进程切换时，打印出切换到该CPU核心上的进程的信息。
timestamp uid pid tgid command running_cpu_core_id
844266752127 0 245 245 swapper/2 2
844466688281 0 245 245 swapper/2 2
844263030050 0 0 0 surfaceflinger 5
844150573742 1000 1847 472 kworker/u16:2 2
844430232281 0 235 235 swapper/1 1
844288505434 0 1030 1030 swapper/3 3
844235142742 0 0 0 mali-cmar-backe 2
844453380357 0 0 0 kworker/u16:7 1
844542420127 0 245 245 swapper/3 3
844150695434 0 0 0 mali-cmar-backe 2
844299940204 1000 2523 2198 swapper/3 3
844381336434 0 0 0 mali-cmar-backe 2
844504524819 0 0 0 kworker/u16:23 0
844524850050 0 0 0 kworker/u16:23 1
844483787127 1000 530 448 shell svc 4405 0
844357043665 0 0 0 kworker/u16:7 3
844350059588 0 0 0 shell svc 4405 0
844297244204 0 0 0 kworker/u17:0 2
844301078357 0 0 0 shell svc 4405 1
844300169050 1000 2830 2198 kworker/u16:2 5