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开机有如下阶段。抛开开机动画需要的audio、surfaceflinger等进程#xff0c;大部分android程序是在/data分区加载完整以后开始加载。所以cpuset的配置可以在 post-fs-data之后。注意#xff0c;init.rc的不同阶段脚本都可能覆盖前面配置的cpuset。配置好检查与…一、开机阶段
开机有如下阶段。抛开开机动画需要的audio、surfaceflinger等进程大部分android程序是在/data分区加载完整以后开始加载。所以cpuset的配置可以在 post-fs-data之后。注意init.rc的不同阶段脚本都可能覆盖前面配置的cpuset。配置好检查与预期不一致则要配置被重置了。
1) early-init a) wait_for_coldboot_done b) property_init c) keychord_int d) console_init e) set_init_properties 2) init 3) early-fs 4) fs 5) post-fs 6) post-fs-data f) property_service_init g) signal_init h) check_startup 7) early-boot 8) boot 9) service
二、配置cpuset
本例策略如下 开机阶段 write /dev/cpuset/top-app/cpus 0-5 write /dev/cpuset/foreground/cpus 0-5 write /dev/cpuset/system-background/cpus 0-5 write /dev/cpuset/background/cpus 4-5
开机完成后 write /dev/cpuset/top-app/cpus 0-3 write /dev/cpuset/foreground/cpus 0-3 write /dev/cpuset/system-background/cpus 3-5
配置方法
修改init.rc
on early-bootwrite /dev/cpuset/top-app/cpus 0-5write /dev/cpuset/foreground/cpus 0-5write /dev/cpuset/foreground/boost/cpus 0-5write /dev/cpuset/system-background/cpus 0-5write /dev/cpuset/background/cpus 4-5
.... on property:sys.boot_completed1write /proc/sys/kernel/printk 4# init.vendor.rc can override below at on property:sys.boot_completed if neededwrite /dev/cpuset/top-app/cpus 0-3write /dev/cpuset/foreground/cpus 0-3write /dev/cpuset/system-background/cpus 3-5
三、配置特定进程的cpuset
# We want all cores for cameramkdir /dev/cpuset/camera-daemonwrite /dev/cpuset/camera-daemon/cpus 0-5write /dev/cpuset/camera-daemon/mems 0chown cameraserver cameraserver /dev/cpuset/camera-daemonchown cameraserver cameraserver /dev/cpuset/camera-daemon/taskschmod 0660 /dev/cpuset/camera-daemon/tasks
四、验证方法
在adb shell里面
#cd /dev/cpuset/top-app
/dev/cpuset/top-app # ps -A -p cat tasks
可以看到top-app下活跃的进程
USER PID PPID VSZ RSS WCHAN ADDR S NAME
u0_a53 2217 378 4546160 192796 ep_poll 0 S com.fiilll.app.launcher
然后敲
ps -o pid,psr,comm -p pidof com.gwm.fiill.launcher 显示的PSR就是核 PID PSR COMM2217 1 app_process64
同样的步骤查看system-background
/dev/cpuset/system-background # ps -A -p cat tasks
USER PID PPID VSZ RSS WCHAN ADDR S NAME
logd 329 1 76160 56700 sigsuspend 0 S logd
system 330 1 11156 3728 binder_ioctl_write_read 0 S servicemanager
system 331 1 2126696 6756 binder_ioctl_write_read 0 S hwservicemanager
system 332 1 11872 3096 binder_ioctl_write_read 0 S vndservicemanager
system 474 1 56072 17740 binder_ioctl_write_read 0 S android.hardware.graphics.composer2.2-service
root 729 1 9544 2400 ep_poll 0 S lmkd
system 731 1 2192692 34460 ep_poll 0 S surfaceflinger
system 735 1 11220 4420 poll_schedule_timeout 0 S name-server
statsd 897 1 23296 6648 ep_poll 0 S statsd
root 898 1 22688 5752 binder_ioctl_write_read 0 S storaged
root 906 1 38444 13552 poll_schedule_timeout 0 S dlt-daemon
system 954 1 2128968 7096 binder_ioctl_write_read 0 S gatekeeperd
root 955 1 18988 4752 binder_ioctl_write_read 0 S perfprofd
tombstoned 959 1 9232 2300 ep_poll 0 S tombstoned
由于statsd是开机完成前加载的所以第一次cpuset可能在0-5之间 PID PSR COMM897 0 statsd
我们以此可以判断开机时候配置的是否正常。
现在杀掉该进程重新加载
kill -6 pidof statsd
再查看它的cpuset
ps -o pid,psr,comm -p pidof statsd
发现cpuset已经变了 PID PSR COMM9766 3 statsd
