perf-test-scripts/set-cpu-freq

#!/bin/bash

# defines
FREQ=0 #percent
SERVICES=(perfd thermal-engine mpdecision)
DIR="/sys/devices/system/cpu"


###################### SETUP ######################

# helper functions
fileexists() {
  [ `adb shell "[ -f $1 ] && echo 1 || echo 0" | tr -d '\r'` -eq 1 ]
}
getprop() {
  if fileexists $1; then
    echo `adb shell cat $1 | tr -d '\r'`
  else
    echo "FILE $1 NOT FOUND"
  fi
}
setprop() {
  if fileexists $1; then
    adb shell "echo -n $2 > $1"
  else
    echo "FILE $1 NOT FOUND"
  fi
}

# use passed in percent frequency
if [[ $# -eq 1 ]]; then
  FREQ=$1
fi

# switch to root
if [[ "`adb shell id | tr -d '\r' | awk -F'[()]' '{print $2}'`" != "root" ]]; then
  adb root
  adb wait-for-device
fi

# device name
echo Device: `adb shell getprop ro.product.model`
echo

# collect all cores
cores=`adb shell ls /sys/devices/system/cpu/ | grep cpu[0-9].* | tr -d '\r'`

# disable GPU
adb shell setprop debug.rs.default-CPU-driver 1


###################### CONFIGURE ######################

# freeze system
for service in ${SERVICES[@]}; do
  adb shell stop $service
done

# set frequencies
declare -A selectedFreq
for core in $cores; do

  # turn on core if possible
  if fileexists $DIR/$core/online; then
    adb shell "echo -n 1 > $DIR/$core/online"
  fi

  # get available frequencies in sorted order
  if fileexists $DIR/$core/cpufreq/scaling_available_frequencies; then
    frequencies=(`getprop $DIR/$core/cpufreq/scaling_available_frequencies`)
  elif fileexists $DIR/$core/cpufreq/stats/time_in_state; then
    frequencies=(`adb shell cat $DIR/$core/cpufreq/stats/time_in_state | cut -f1 -d " " | tr -d '\r'`)
  fi
  frequencies=(`printf "%s\n" "${frequencies[@]}" | sort -n`)

  # find target frequency based on frequency percentage
  minFreq=${frequencies[0]}
  maxFreq=${frequencies[-1]}
  targetFreq=$(( FREQ * ( maxFreq - minFreq ) / 100 + minFreq ))

  # find closest frequency
  freq=`printf "%d\n" "${frequencies[@]}" | awk -v c=${frequencies[0]} -v t=$targetFreq 'BEGIN{d=$0-t;if(d<0)d=-d;l=d}{d=$0-t;if(d<0)d=-d;if(d<l){l=d;c=$0}}END{print c}'`
  selectedFreq[$core]=$freq

  # set frequency
  adb shell "echo -n $freq > $DIR/$core/cpufreq/scaling_min_freq"
  adb shell "echo -n $freq > $DIR/$core/cpufreq/scaling_max_freq"

done


# keep trying until the frequencies are properly set
while true; do

  # check to see if frequencies are correct
  CORRECT=true
  for core in $cores; do
    if fileexists $DIR/$core/online && [ `getprop $DIR/$core/online` -eq 0 ]; then
      echo "$core is offline"
      CORRECT=false
    else
      if fileexists $DIR/$core/cpufreq/scaling_cur_freq; then
        frequency=`getprop $DIR/$core/cpufreq/scaling_cur_freq`
        if [ $frequency != ${selectedFreq[$core]} ]; then
          echo "$core: $frequency != ${selectedFreq[$core]}"
          CORRECT=false
        fi
      else
        echo "$core is offline"
        CORRECT=false
      fi
    fi
  done

  # finished
  if [ $CORRECT == "true" ]; then
    break
  fi

  # display
  echo "Frequencies not properly set. Trying again..."

  # unfreeze system
  for service in ${SERVICES[@]}; do
    adb shell start $service
  done

  # wait for changes to be made
  sleep 1

  # freeze system
  for service in ${SERVICES[@]}; do
    adb shell stop $service
  done

  # try resetting the values (only really needed for Nexus 7 for some reason)
  for core in $cores; do
    if fileexists $DIR/$core/online; then
      adb shell "echo -n 1 > $DIR/$core/online"
    fi
    adb shell "echo -n $freq > $DIR/$core/cpufreq/scaling_min_freq"
    adb shell "echo -n $freq > $DIR/$core/cpufreq/scaling_max_freq"
  done

  sleep 1

done

# display
for core in $cores; do
  echo "$core successfully set to ${selectedFreq[$core]}"
done