Initial commit

Makefile

+all:
+	install -m 0755 zramstart /usr/sbin
+	install -m 0755 zramstop /usr/sbin
+	install -m 0755 zramstat /usr/sbin
+	install -m 0644 mkzram.service /lib/systemd/system
+	install -m 0644 zram /etc/sysconfig

mkzram.service

+[Unit]
+Description=Enable compressed swap in memory using zram
+After=multi-user.target
+
+[Service]
+RemainAfterExit=yes
+ExecStart=/usr/sbin/zramstart
+ExecStop=/usr/sbin/zramstop
+Type=oneshot
+
+[Install]
+WantedBy=swap.target

zram

+# The factor is how much (from 0 to 100, percentage)
+# of system RAM to allocate to ZRAM block devices
+# Too big, and your system will start killing off processes
+FACTOR=33

zramstart

+#!/bin/sh
+
+num_cpus=$(nproc)
+[ "$num_cpus" != 0 ] || num_cpus=1
+
+last_cpu=$((num_cpus - 1))
+FACTOR=33
+[ -f /etc/sysconfig/zram ] && source /etc/sysconfig/zram || true
+factor=$FACTOR # percentage
+
+memtotal=$(grep MemTotal /proc/meminfo | awk ' { print $2 } ')
+mem_by_cpu=$(($memtotal/$num_cpus*$factor/100*1024))
+
+modprobe -q zram num_devices=$num_cpus
+
+for i in $(seq 0 $last_cpu); do
+	#enable lz4 if that supported
+	grep -q lz4 /sys/block/zram$i/comp_algorithm && echo lz4 > /sys/block/zram$i/comp_algorithm
+	echo $mem_by_cpu > /sys/block/zram$i/disksize
+	mkswap /dev/zram$i
+	swapon -p 100 /dev/zram$i
+done

zramstat

+#!/bin/sh
+
+ls /sys/block/zram* > /dev/null 2>&1 || exit 0
+
+for i in /sys/block/zram*; do
+	compr=$(< $i/compr_data_size)
+	orig=$(< $i/orig_data_size)
+	ratio=0
+	if [ $compr -gt 0 ]; then
+		ratio=$(echo "scale=2; $orig*100/$compr" | bc -q)
+	fi
+	echo -e "/dev/${i/*\/}:\t$ratio% ($orig -> $compr)"
+done

zramstop

+#!/bin/sh
+
+for i in $(grep '^/dev/zram' /proc/swaps | awk '{ print $1 }'); do
+	swapoff "$i"
+done
+
+if grep -q "^zram " /proc/modules; then
+	sleep 1
+	rmmod zram
+fi