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