/etc/pm/power.d/01cpu_online is in powernap-common 2.18-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | #!/bin/sh
#
# turn_off_cpus: This script turns off all the CPU's available, except
# for CPU 0.
#
# Copyright (C) 2010 Canonical Ltd.
#
# Authors: Andres Rodriguez <andreserl@ubuntu.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set_cpu_online() {
for cpu in /sys/devices/system/cpu/cpu*/online; do
[ -w "$cpu" ] || continue
echo $1 > $cpu
done
}
help() {
echo "Turns off all the CPU's (cores) available but CPU0."
}
case $1 in
true)
# Disable CPU
set_cpu_online 0 ;;
false)
# Enable CPU
set_cpu_online 1 ;;
help)
help;;
*)
exit $NA ;;
esac
|