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| 1 | #!/bin/bash | |
| 2 | ### BEGIN INIT INFO | |
| 3 | # Provides: zram | |
| 4 | - | @@# Required-Start: $local_fs |
| 4 | + | # Required-Start: $local_fs |
| 5 | # Required-Stop: | |
| 6 | # Default-Start: 2 3 4 5 | |
| 7 | # Default-Stop: 0 1 6 | |
| 8 | # Short-Description: Increased Performance In Linux With zRam (Virtual Swap Compressed in RAM) | |
| 9 | # Description: Adapted from systemd scripts at https://github.com/mystilleef/FedoraZram | |
| 10 | # Included as part of antix-goodies package by anticapitalista <antiX@operamail.com> | |
| 11 | # This script was written by tradetaxfree and is found at http://crunchbanglinux.org/forums/topic/15344/zram-a-good-idea/ | |
| 12 | # Copy this script (as root) from /usr/local/bin to /etc/init.d and then #update-rc.d zram defaults | |
| 13 | # After booting verify the module is loaded with: lsmod | grep zram | |
| 14 | ### END INIT INFO | |
| 15 | ||
| 16 | start() {
| |
| 17 | # get the number of CPUs | |
| 18 | num_cpus=$(grep -c processor /proc/cpuinfo) | |
| 19 | # if something goes wrong, assume we have 1 | |
| 20 | [ "$num_cpus" != 0 ] || num_cpus=1 | |
| 21 | ||
| 22 | # set decremented number of CPUs | |
| 23 | last_cpu=$((num_cpus - 1)) | |
| 24 | ||
| 25 | #default Factor % = 90 change this value here or create /etc/default/zram | |
| 26 | FACTOR=90 | |
| 27 | #& put the above single line in /etc/default/zram with the value you want | |
| 28 | [ -f /etc/default/zram ] && source /etc/default/zram || true | |
| 29 | factor=$FACTOR # percentage | |
| 30 | ||
| 31 | # get the amount of memory in the machine | |
| 32 | # memtotal=$(grep MemTotal /proc/meminfo | awk ' { print $2 } ')
| |
| 33 | memtotal=$(grep MemTotal /proc/meminfo | sed 's/[^0-9]\+//g') | |
| 34 | mem_by_cpu=$(($memtotal/$num_cpus*$factor/100*1024)) | |
| 35 | ||
| 36 | # load dependency modules | |
| 37 | # kernels 3.4 onwards | |
| 38 | ||
| 39 | modprobe zram num_devices=$num_cpus | |
| 40 | ||
| 41 | if [ $? -gt 0 ]; then | |
| 42 | # kernels 3.1 - 3.3 | |
| 43 | #modprobe zram zram_num_devices=$num_cpus | |
| 44 | #else | |
| 45 | echo -e "Your Kernel needs to be compiled with ZRAM support:" \ | |
| 46 | "\n\nDevice Drivers --> Staging Drivers --> Compressed RAM block device support (M)" \ | |
| 47 | "\nDevice Drivers --> Staging Drivers --> Dynamic compression of swap pages and clean pagecache pages (*)" \ | |
| 48 | "\n\nThe Liquorix Kernel (http://liquorix.net) has ZRAM support built in." | |
| 49 | exit 1 | |
| 50 | fi | |
| 51 | echo "zram devices probed successfully" | |
| 52 | ||
| 53 | # initialize the devices | |
| 54 | for i in $(seq 0 $last_cpu); do | |
| 55 | echo $mem_by_cpu > /sys/block/zram$i/disksize | |
| 56 | # Creating swap filesystems | |
| 57 | mkswap /dev/zram$i | |
| 58 | # Switch the swaps on | |
| 59 | swapon -p 100 /dev/zram$i | |
| 60 | done | |
| 61 | } | |
| 62 | ||
| 63 | stop() {
| |
| 64 | # get the number of CPUs | |
| 65 | num_cpus=$(grep -c processor /proc/cpuinfo) | |
| 66 | ||
| 67 | # set decremented number of CPUs | |
| 68 | last_cpu=$((num_cpus - 1)) | |
| 69 | ||
| 70 | # Switching off swap | |
| 71 | for i in $(seq 0 $last_cpu); do | |
| 72 | if [ "$(grep /dev/zram$i /proc/swaps)" != "" ]; then | |
| 73 | swapoff /dev/zram$i | |
| 74 | sleep 1 | |
| 75 | fi | |
| 76 | done | |
| 77 | ||
| 78 | sleep 1 | |
| 79 | rmmod zram | |
| 80 | } | |
| 81 | ||
| 82 | case "$1" in | |
| 83 | start) | |
| 84 | start | |
| 85 | ;; | |
| 86 | stop) | |
| 87 | stop | |
| 88 | ;; | |
| 89 | restart) | |
| 90 | stop | |
| 91 | sleep 3 | |
| 92 | start | |
| 93 | ;; | |
| 94 | *) | |
| 95 | echo "Usage: $0 {start|stop|restart}"
| |
| 96 | RETVAL=1 | |
| 97 | esac | |
| 98 | exit $RETVAL |
