Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | #!/bin/bash |
| 2 | # Copyright 2014 the V8 project authors. All rights reserved. |
| 3 | # Use of this source code is governed by a BSD-style license that can be |
| 4 | # found in the LICENSE file. |
| 5 | |
| 6 | CPUPATH=/sys/devices/system/cpu |
| 7 | |
| 8 | MAXID=$(cat $CPUPATH/present | awk -F- '{print $NF}') |
| 9 | |
| 10 | set_governor() { |
| 11 | echo "Setting CPU frequency governor to \"$1\"" |
| 12 | for (( i=0; i<=$MAXID; i++ )); do |
| 13 | echo "$1" > $CPUPATH/cpu$i/cpufreq/scaling_governor |
| 14 | done |
| 15 | } |
| 16 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 17 | enable_cores() { |
| 18 | # $1: How many cores to enable. |
| 19 | for (( i=1; i<=$MAXID; i++ )); do |
| 20 | if [ "$i" -lt "$1" ]; then |
| 21 | echo 1 > $CPUPATH/cpu$i/online |
| 22 | else |
| 23 | echo 0 > $CPUPATH/cpu$i/online |
| 24 | fi |
| 25 | done |
| 26 | } |
| 27 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 28 | dual_core() { |
| 29 | echo "Switching to dual-core mode" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 30 | enable_cores 2 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 31 | } |
| 32 | |
| 33 | single_core() { |
| 34 | echo "Switching to single-core mode" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 35 | enable_cores 1 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 36 | } |
| 37 | |
| 38 | |
| 39 | all_cores() { |
| 40 | echo "Reactivating all CPU cores" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 41 | enable_cores $((MAXID+1)) |
| 42 | } |
| 43 | |
| 44 | |
| 45 | limit_cores() { |
| 46 | # $1: How many cores to enable. |
| 47 | echo "Limiting to $1 cores" |
| 48 | enable_cores $1 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 49 | } |
| 50 | |
| 51 | case "$1" in |
| 52 | fast | performance) |
| 53 | set_governor "performance" |
| 54 | ;; |
| 55 | slow | powersave) |
| 56 | set_governor "powersave" |
| 57 | ;; |
| 58 | default | ondemand) |
| 59 | set_governor "ondemand" |
| 60 | ;; |
| 61 | dualcore | dual) |
| 62 | dual_core |
| 63 | ;; |
| 64 | singlecore | single) |
| 65 | single_core |
| 66 | ;; |
| 67 | allcores | all) |
| 68 | all_cores |
| 69 | ;; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 70 | limit_cores) |
| 71 | if [ $# -ne 2 ]; then |
| 72 | echo "Usage $0 limit_cores <num>" |
| 73 | exit 1 |
| 74 | fi |
| 75 | limit_cores $2 |
| 76 | ;; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 77 | *) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 78 | echo "Usage: $0 fast|slow|default|singlecore|dualcore|all|limit_cores" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 79 | exit 1 |
| 80 | ;; |
| 81 | esac |