#!/bin/sh
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set -e
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device=$1
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if [ "$device" = "" ]; then
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echo "Usage: zram-swap-init <device>"
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exit 1
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fi
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# Allocate zram to be size of actual system memory
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# Note: zram is only allocated when used. When swapped pages compress with a
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# a 2:1 ratio zram will require 50% of system memory (while allowing to use
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# 150% memory).
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ZRAM_SIZE_PERCENT=100
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ZRAM_ALGORITHM=lz4
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[ -f /etc/default/zram ] && . /etc/default/zram || true
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memtotal=$(grep MemTotal /proc/meminfo | awk ' { print $2 } ')
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memzram=$(($memtotal*${ZRAM_SIZE_PERCENT}/100))
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# Try loading zram module
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modprobe -q zram || true
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zramctl -a ${ZRAM_ALGORITHM} -s ${memzram}KB $device
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mkswap -L "zram-swap" $device
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devname="${device##*/}"
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if [ ! -z ${ZRAM_SIZE_LIMIT+x} ]; then
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echo ${ZRAM_SIZE_LIMIT} > /sys/block/$devname/mem_limit
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fi
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