Camillo Bruni
ea45bfc636
Put the information in -h instead of some v8.dev info page. Change-Id: I145d204e7b1fbac4fda1b849e71e1d4c037e12a7 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/7715040 Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Commit-Queue: Camillo Bruni <cbruni@chromium.org> Cr-Commit-Position: refs/heads/main@{#106169}
91 lines
1.9 KiB
Bash
Executable File
91 lines
1.9 KiB
Bash
Executable File
#!/bin/bash
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# Copyright 2014 the V8 project authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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CPUPATH=/sys/devices/system/cpu
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MAXID=$(cat $CPUPATH/present | awk -F- '{print $NF}')
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set_governor() {
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echo "Setting CPU frequency governor to \"$1\""
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for (( i=0; i<=$MAXID; i++ )); do
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echo "$1" > $CPUPATH/cpu$i/cpufreq/scaling_governor
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done
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}
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enable_cores() {
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# $1: How many cores to enable.
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for (( i=1; i<=$MAXID; i++ )); do
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if [ "$i" -lt "$1" ]; then
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echo 1 > $CPUPATH/cpu$i/online
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else
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echo 0 > $CPUPATH/cpu$i/online
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fi
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done
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}
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dual_core() {
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echo "Switching to dual-core mode"
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enable_cores 2
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}
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single_core() {
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echo "Switching to single-core mode"
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enable_cores 1
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}
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all_cores() {
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echo "Reactivating all CPU cores"
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enable_cores $((MAXID+1))
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}
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limit_cores() {
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# $1: How many cores to enable.
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echo "Limiting to $1 cores"
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enable_cores $1
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}
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case "$1" in
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fast | performance)
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set_governor "performance"
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;;
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slow | powersave)
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set_governor "powersave"
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;;
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default | ondemand)
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set_governor "ondemand"
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;;
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dualcore | dual)
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dual_core
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;;
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singlecore | single)
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single_core
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;;
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allcores | all)
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all_cores
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;;
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limit_cores)
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if [ $# -ne 2 ]; then
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echo "Usage $0 limit_cores <num>"
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exit 1
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fi
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limit_cores $2
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;;
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*)
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echo "Usage: ${0} MODE"
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echo ""
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echo "The MODES $(basename $0) understands are:"
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echo "- fast, performance (alias for fast)"
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echo "- slow, powersave (alias for slow)"
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echo "- default, ondemand (alias for default)"
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echo "- singlecore (disables all but one core), single (alias for singlecore)"
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echo "- dualcore (disables all but two cores), dual (alias for dualcore)"
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echo "- allcores (re-enables all available cores), all (alias for allcores)"
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echo "- limit_cores <num> (disables all but <num> cores)"
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exit 1
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;;
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esac
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