69 lines
2.2 KiB
Bash
69 lines
2.2 KiB
Bash
#!/bin/bash
|
|
#
|
|
# Copyright (C) 2014 Red Hat, Inc.
|
|
#
|
|
# Heavily inspired by zramswapon script found in the Simone Sclavi's repository
|
|
# at http://software.opensuse.org/package/systemd-zram-service
|
|
#
|
|
# This copyrighted material is made available to anyone wishing to use,
|
|
# modify, copy, or redistribute it subject to the terms and conditions of
|
|
# the GNU General Public License v.2, or (at your option) any later version.
|
|
# This program is distributed in the hope that it will be useful, but WITHOUT
|
|
# ANY WARRANTY expressed or implied, including the implied warranties 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, write to the
|
|
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
|
|
# source code or documentation are not subject to the GNU General Public
|
|
# License and may only be used or replicated with the express permission of
|
|
# Red Hat, Inc.
|
|
#
|
|
# Red Hat Author(s): Vratislav Podzimek <vpodzime@redhat.com>
|
|
#
|
|
|
|
set -x
|
|
|
|
MAX_RAM_ON=2097152
|
|
|
|
# get the amount of memory in the machine
|
|
mem_total_kb=$(grep MemTotal /proc/meminfo | grep -E --only-matching '[[:digit:]]+')
|
|
mem_total=$((mem_total_kb * 1024))
|
|
|
|
grep -E 'inst\.zram=(on|1)' /proc/cmdline > /dev/null
|
|
force=$?
|
|
if [ \( $mem_total_kb -gt $MAX_RAM_ON \) -a \( $force != "0" \) ]; then
|
|
# more than 1 GB of RAM and not forced, do nothing
|
|
exit 0
|
|
fi
|
|
|
|
# get the number of CPUs
|
|
num_cpus=$(getconf _NPROCESSORS_ONLN)
|
|
|
|
# set decremented number of CPUs
|
|
decr_num_cpus=$((num_cpus - 1))
|
|
|
|
# load dependency modules
|
|
modprobe zram num_devices=$num_cpus
|
|
|
|
# initialize the devices
|
|
for i in $(seq 0 $decr_num_cpus); do
|
|
echo $((mem_total / num_cpus)) > /sys/block/zram$i/disksize
|
|
done
|
|
|
|
# Creating swap filesystems
|
|
for i in $(seq 0 $decr_num_cpus); do
|
|
mkswap /dev/zram$i
|
|
done
|
|
|
|
# Switch the swaps on
|
|
for i in $(seq 0 $decr_num_cpus); do
|
|
swapon -p 100 /dev/zram$i
|
|
done
|
|
|
|
if [ $mem_total_kb -le "1048576" ]; then
|
|
# less than 1 GB or RAM -> less than 512 MB /tmp (tmpfs defaults to
|
|
# 0.5*RAM), bump up the /tmp's size, yum may need it
|
|
mount -o remount,size=512M /tmp
|
|
fi
|