freqd

#!/bin/bash

function setfreq {
    LAST_FREQUENCY=$CURRENT_FREQUENCY

    echo -n " => setting frequency to ${FREQUENCY[$NEXT_FREQUENCY]}"
    xenpm set-scaling-maxfreq ${FREQUENCY[$NEXT_FREQUENCY]}

    CURRENT_FREQUENCY=$NEXT_FREQUENCY
    LAST_CHANGE=$(date +%s)
}

FREQUENCY[0]=1000000
FREQUENCY[1]=1333000
FREQUENCY[2]=1667000
FREQUENCY[3]=2000000

TEMP_INPUT_SRC="/sys/class/hwmon/hwmon0/temp2_input"
TEMP_CRITICAL_SRC="/sys/class/hwmon/hwmon0/temp2_crit"

LAST_FREQUENCY=0
CURRENT_FREQUENCY=0
LAST_CHANGE=0

xenpm set-scaling-governor userspace
xenpm set-scaling-minfreq 1000000
xenpm set-scaling-maxfreq 1000000

while true
do
    TEMP_INPUT=$(cat $TEMP_INPUT_SRC)
    TEMP_CRITICAL=$(cat $TEMP_CRITICAL_SRC)
    CURRENT_TIMESTAMP=$(date +%s)
    TIME_DIFF=$(( $CURRENT_TIMESTAMP - $LAST_CHANGE ))

    PERCENT=$(( $TEMP_INPUT * 100 / $TEMP_CRITICAL ))
    echo -n "${PERCENT}%"

    if [ $PERCENT -ge 95 ]
    then
        echo -n " >= 95%"
        if [ $CURRENT_FREQUENCY -ne 0 ]
        then
            NEXT_FREQUENCY=$(( $CURRENT_FREQUENCY - 1 ))
            setfreq $NEXT_FREQUENCY
        else
            echo 1 > /proc/acpi/ibm/beep
        fi
    elif [ $PERCENT -ge 90 ]
    then
        echo -n " >= 90%"
        if [ $CURRENT_FREQUENCY -lt 1 ] && [ $TIME_DIFF -ge 20 ]
        then
            NEXT_FREQUENCY=$(( $CURRENT_FREQUENCY + 1 ))
            setfreq $NEXT_FREQUENCY
        fi
    elif [ $PERCENT -ge 85 ]
    then
        echo -n " >= 85%"
        if [ $CURRENT_FREQUENCY -lt 2 ] && [ $TIME_DIFF -ge 15 ]
        then
            NEXT_FREQUENCY=$(( $CURRENT_FREQUENCY + 1 ))
            setfreq $NEXT_FREQUENCY
        fi
    else
        echo -n " < 85%"
        if [ $CURRENT_FREQUENCY -lt 3 ] && [ $TIME_DIFF -ge 10 ]
        then
            NEXT_FREQUENCY=$(( $CURRENT_FREQUENCY + 1 ))
            setfreq $NEXT_FREQUENCY
        fi
    fi

    echo ""
    sleep 1
done

xenpm set-scaling-governor powersave
xenpm set-scaling-minfreq $FREQUENCY[0]
xenpm set-scaling-maxfreq $FREQUENCY[3]