#!/bin/bash
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set_cpu_freq() {
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echo userspace > $1/scaling_governor
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echo $2 > $1/scaling_setspeed
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cur=`cat $1/scaling_cur_freq`
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if [ "$cur" -eq "$2" ];then
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echo "cpu freq policy:${d##*policy} success change to $cur KHz"
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else
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echo "cpu freq: failed change to $2 KHz, now $cur KHz"
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exit
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fi
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}
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if [ "$#" -eq "1" ];then
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for d in /sys/devices/system/cpu/cpufreq/*; do
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read -a array < $d/scaling_available_frequencies
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let j=${#array[@]}-1
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for i in `seq 0 $j`; do
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if [ "$1" -eq "${array[$i]}" ];then
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set_cpu_freq $d $1
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exit
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fi
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done
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echo "cpu freq: $1 is not in available frequencies: "${array[*]}""
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echo "cpu freq: now $(cat $d/scaling_cur_freq) Hz"
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done
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else
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cnt=0
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RANDOM=$$$(date +%s)
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while true; do
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for d in /sys/devices/system/cpu/cpufreq/*; do
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read -a FREQS < $d/scaling_available_frequencies
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FREQ=${FREQS[$RANDOM % ${#FREQS[@]} ]}
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echo -n "cnt: $cnt, "
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set_cpu_freq $d ${FREQ}
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let "cnt=$cnt+1"
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done
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done
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fi
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