在排查性能相关问题时，有时我们需要看下是否是cpu降频了之类的~，那么通过adb命令来查看和设置cpu频率就派上用场了。
设置CPU频率：
echo "cpu 0 freq"adb shell "echo "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"adb shell "echo "1958400" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed"echo "cpu 1 freq"adb shell "echo "userspace" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor"adb shell "echo "1958400" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_setspeed"echo "cpu 2 freq"adb shell "echo "userspace" > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor"adb shell "echo "1958400" > /sys/devices/system/cpu/cpu2/cpufreq/scaling_setspeed"echo "cpu 3 freq"adb shell "echo "userspace" > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor"adb shell "echo "1958400" > /sys/devices/system/cpu/cpu3/cpufreq/scaling_setspeed"
查看当前cpu频率：
for ((i=0;i<3000000;i++));doecho "\n\n========test cnt ${i}======="echo "cpu 0 freq"adb shell "cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq"echo "cpu 1 freq"adb shell "cat /sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_cur_freq"echo "cpu 2 freq"adb shell "cat /sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_cur_freq"echo "cpu 3 freq"adb shell "cat /sys/devices/system/cpu/cpu3/cpufreq/cpuinfo_cur_freq"echo "cpu 4 freq"adb shell "cat /sys/devices/system/cpu/cpu4/cpufreq/cpuinfo_cur_freq"echo "cpu 5 freq"adb shell "cat /sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_cur_freq"done
cpufreq中参数说明：
scaling_setspeed–设置cpu运行的频率
cpuinfo_cur_freq–CPU当前运行的频率
cpuinfo_max_freq—CPU可以运行的最大频率
cpuinfo_min_freq—CPU最小运行频率
scaling_governor—控制CPU频率的调整方式
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