Clickx 115/Clickx 115.iso/software/tools/windows/tails-i386-0.16.iso/live/filesystem.squashfs/usr/share/laptop-mode-tools/modules/cpufreq

Text File | 2012-05-20 | 4.6 KB | 142 lines

#! /bin/sh
#
# Laptop mode tools module to handle CPU frequency settings.
#

# Set kernel setting, showing an error if this fails.
# Parameter 1: sysctl/proc path
# Parameter 2: the value
set_sysctl() {
    log "VERBOSE" "Executing: echo $2 > $1"
    if ! echo "$2" > "$1" ; then
        echo "SETTING OF KERNEL PARAMETER FAILED: echo $2 \> $1"
    fi
}


#
# get_medium_value
#
#   Get the medium value from a list of numerical values.
#   $1 = file containing the list of values
#
get_medium_value() {
    cat "$1" | tr ' ' '\n' | sort -n | awk -v RS="" '{n=split($0,a); print a[int((n+1)/2)]}'
}


if [ x$CONTROL_CPU_FREQUENCY = x1 ] || [ x$ENABLE_AUTO_MODULES = x1 -a x$CONTROL_CPU_FREQUENCY = xauto ]; then
    if [ $ON_AC -eq 1 ] ; then
        if [ "$ACTIVATE" -eq 1 ] ; then
            CPU_MAXFREQ="$LM_AC_CPU_MAXFREQ"
            CPU_MINFREQ="$LM_AC_CPU_MINFREQ"
            CPU_GOVERNOR="$LM_AC_CPU_GOVERNOR"
            CPU_IGNORE_NICE_LOAD="$LM_AC_CPU_IGNORE_NICE_LOAD"
        else
            CPU_MAXFREQ="$NOLM_AC_CPU_MAXFREQ"
            CPU_MINFREQ="$NOLM_AC_CPU_MINFREQ"
            CPU_GOVERNOR="$NOLM_AC_CPU_GOVERNOR"
            CPU_IGNORE_NICE_LOAD="$NOLM_AC_CPU_IGNORE_NICE_LOAD"
        fi
    else
        CPU_MAXFREQ="$BATT_CPU_MAXFREQ"
        CPU_MINFREQ="$BATT_CPU_MINFREQ"
        CPU_GOVERNOR="$BATT_CPU_GOVERNOR"
        CPU_IGNORE_NICE_LOAD="$BATT_CPU_IGNORE_NICE_LOAD"
    fi
    for THISCPU in /sys/devices/system/cpu/* ; do
        if [ -e $THISCPU/cpufreq/cpuinfo_min_freq ]; then
            THIS_CPU_MAXFREQ="$CPU_MAXFREQ"
            THIS_CPU_MINFREQ="$CPU_MINFREQ"
            THIS_CPU_GOVERNOR="$CPU_GOVERNOR"
            THIS_CPU_IGNORE_NICE_LOAD="$CPU_IGNORE_NICE_LOAD"

            case "$CPU_MAXFREQ" in
            "slowest")
                THIS_CPU_MAXFREQ=`cat $THISCPU/cpufreq/cpuinfo_min_freq`
                ;;
            "medium")
                THIS_CPU_MAXFREQ=$(get_medium_value $THISCPU/cpufreq/scaling_available_frequencies)
                ;;
            "fastest")
                THIS_CPU_MAXFREQ=`cat $THISCPU/cpufreq/cpuinfo_max_freq`
                ;;
            esac

            case "$CPU_MINFREQ" in
            "slowest")
                THIS_CPU_MINFREQ=`cat $THISCPU/cpufreq/cpuinfo_min_freq`
                ;;
            "medium")
                THIS_CPU_MINFREQ=$(get_medium_value $THISCPU/cpufreq/scaling_available_frequencies)
                ;;
            "fastest")
                THIS_CPU_MINFREQ=`cat $THISCPU/cpufreq/cpuinfo_max_freq`
                ;;
            esac

            log "VERBOSE" "Setting CPU maximum frequency for cpu $THISCPU to $THIS_CPU_MAXFREQ."
            set_sysctl $THISCPU/cpufreq/scaling_max_freq $THIS_CPU_MAXFREQ
            log "VERBOSE" "Setting CPU minimum frequency for cpu $THISCPU to $THIS_CPU_MINFREQ."
            set_sysctl $THISCPU/cpufreq/scaling_min_freq $THIS_CPU_MINFREQ
            log "VERBOSE" "Setting CPU frequency governor for cpu $THISCPU to $THIS_CPU_GOVERNOR."
            log "VERBOSE" "`/sbin/modprobe -q cpufreq_$THIS_CPU_GOVERNOR 2>&1`"
            set_sysctl $THISCPU/cpufreq/scaling_governor $THIS_CPU_GOVERNOR

            # Retain for backward compatibility
            if [ -f "$THISCPU/cpufreq/$THIS_CPU_GOVERNOR/ignore_nice_load" ] ; then
                log "VERBOSE" "Setting CPU ignore_nice_load for cpu $THISCPU to $THIS_CPU_IGNORE_NICE_LOAD."
                set_sysctl $THISCPU/cpufreq/$THIS_CPU_GOVERNOR/ignore_nice_load $THIS_CPU_IGNORE_NICE_LOAD
            else
                log "VERBOSE" "Not setting CPU ignore_nice_load for cpu $THISCPU."
                log "VERBOSE" "File $THISCPU/cpufreq/$THIS_CPU_GOVERNOR/ignore_nice_load does not exist."
            fi
        fi
    done

    # For kernels 2.6.32 and above, the sysfs interface for OnDemand per-core power savings has changed.
    # Instead of per-core, the new interface is generic and a single one
    if [ -f "/sys/devices/system/cpu/cpufreq/$THIS_CPU_GOVERNOR/ignore_nice_load" ]; then
        log "VERBOSE" "Setting CPU ignore_nice_load for all cpus"
        set_sysctl /sys/devices/system/cpu/cpufreq/$THIS_CPU_GOVERNOR/ignore_nice_load $CPU_IGNORE_NICE_LOAD
    else
        log "VERBOSE" "No generic CPU ignore_nice_load interface available"
    fi
fi

if [ x$CONTROL_CPU_THROTTLING = x1 ]  || [ x$ENABLE_AUTO_MODULES = x1 -a x$CONTROL_CPU_THROTTLING = xauto ]; then
    if [ $ON_AC -eq 1 ] ; then
        if [ "$ACTIVATE" -eq 1 ] ; then
            CPU_THROTTLING="$LM_AC_CPU_THROTTLING"
        else
            CPU_THROTTLING="$NOLM_AC_CPU_THROTTLING"
        fi
    else
        CPU_THROTTLING="$BATT_CPU_THROTTLING"
    fi
    for THISCPU in /proc/acpi/processor/* ; do
        if [ -e $THISCPU/throttling ]; then
            NUM_LEVELS=`cat $THISCPU/throttling | grep "T[0123456789]*\:" | wc -l`
            case "$CPU_THROTTLING" in
            "minimum")
                THIS_CPU_THROTTLING=0
                ;;
            "medium")
                # Divide but round up: that way, "medium" on a two-level system will
                # lead to full throttling -- which is 50% on my system, quite reasonable.
                THIS_CPU_THROTTLING=$(( ($NUM_LEVELS / 2 ) ))
                ;;
            "maximum")
                THIS_CPU_THROTTLING=$(($NUM_LEVELS - 1))
                ;;
            *)
                THIS_CPU_THROTTLING="$CPU_THROTTLING"
            esac

            log "VERBOSE" "Setting throttling level for cpu $THISCPU to $THIS_CPU_THROTTLING."
            set_sysctl $THISCPU/throttling $THIS_CPU_THROTTLING
        fi
    done
fi