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zram-swap-manager.sh
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zram-swap-manager.sh
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#!/usr/bin/env sh
version="v2023.7.17 (202307170)"
info="zRAM Swap Manager $version
Upstream repo: github.com/vr-25/zram-swap-manager
Copyright (C) 2021-2023, VR25
License: GPLv3+"
IFS="$(printf ' \t\n')"
temp_dir=/dev/.vr25/zram-swap-manager
magisk_mod=/data/adb/modules/zram-swap-manager
mod_data=/data/adb/vr25/zram-swap-manager-data
calc() {
awk "BEGIN {print $*}" | xargs printf %.f
}
edit_config() {
config=/etc/zram-swap-manager.conf
[ -f $config ] || config=$mod_data/config.txt
if [ -n "$1" ]; then
eval "$* $config"
else
for i in $EDITOR vim vi nano; do
which ${i%% *} >/dev/null && {
eval "$i $config"
break
}
done
fi
unset config i
}
hot_add() {
cat /sys/class/zram-control/hot_add 2>/dev/null || echo 0
}
hot_remove() {
write /sys/class/zram-control/hot_remove $1
}
mem_estimates() {
case $disksize in
*[kK]) disksize=$(calc "${disksize%?} * 1024");;
*[mM]) disksize=$(calc "${disksize%?} * 1024 * 1024");;
*[gG]) disksize=$(calc "${disksize%?} * 1024 * 1024 * 1024");;
*[tT]) disksize=$(calc "${disksize%?} * 1024 * 1024 * 1024 * 1024");;
esac
total_mem_before=$(calc "$mem_total / 1024")
net_gain=$(calc "(($disksize - $mem_limit) / 1024) / 1024")
total_mem_now=$(calc "$total_mem_before + $net_gain")
net_gain_percent=$(calc "$net_gain * 100 / $total_mem_before")
printf "Memory Estimates
Without zRAM:\t${total_mem_before} MB
With zRAM:\t${total_mem_now} MB
Net Gain:\t${net_gain} MB ($net_gain_percent%s)\n" %
unset total_mem_before total_mem_now net_gain net_gain_percent
}
prep_exec() {
[ -d /data/adb ] && {
mkswap() {
for exec in /data/adb/vr25/bin/mkswap /vendor/bin/mkswap /*/*bin/mkswap /sbin/mkswap mkswap; do
if [ -x $exec ] || which $exec >/dev/null; then
eval $exec "$@" && break || echo "(i) Trying alternative: $exec..."
fi
done
}
swapoff() {
for exec in /data/adb/vr25/bin/swapoff /vendor/bin/swapoff /*/*bin/swapoff /sbin/swapoff swapoff; do
if [ -x $exec ] || which $exec >/dev/null; then
eval $exec "$@" && break || echo "(i) Trying alternative: $exec..."
fi
done
}
swapon() {
for exec in /data/adb/vr25/bin/swapon /vendor/bin/swapon /*/*bin/swapon /sbin/swapon swapon; do
if [ -x $exec ] || which $exec >/dev/null; then
eval $exec "$@" && break || echo "(i) Trying alternative: $exec..."
fi
done
}
}
}
stop_swappinessd() {
rm $temp_dir/*.lock 2>/dev/null && sleep 2
}
swap_off() {
stop_swappinessd
for i in ${swap_device}*; do
[ -b $i ] || continue
swapoff $i
write /sys/block/zram${i#$swap_device}/reset 1
hot_remove ${i#$swap_device}
done
for i in $(awk '/^\//{print $1}' /proc/swaps); do
swapoff $i
done
unset i
}
swap_on() {
i=$(hot_add)
write /sys/module/zswap/parameters/enabled 0
modprobe zram num_devices=1 2>/dev/null
grep -q $comp_algorithm /sys/block/zram$i/comp_algorithm || {
case "$(cat /sys/block/zram$i/comp_algorithm)" in
*zstd*) comp_algorithm=zstd; comp_ratio=288;;
*lz4*) comp_algorithm=lz4; comp_ratio=210;;
*lzo-rle*) comp_algorithm=lzo-rle; comp_ratio=212;;
*lzo*) comp_algorithm=lzo; comp_ratio=211;;
esac
}
# mem_limit is disabled due to issues on certain kernels
for j in max_comp_streams comp_algorithm disksize _mem_limit; do
eval write /sys/block/zram$i/$j \$$j
done
mkswap $swap_device$i
swapon $swap_device$i
for i in $vm; do
[ -f /proc/sys/vm/${i%=*} ] && [ -n "${i#*=}" ] && write /proc/sys/vm/${i%=*} ${i#*=}
done
unset i j
! $dynamic_swappiness || swappinessd
}
swappinessd() {
stop_swappinessd
lock_file=$temp_dir/$(date +%s).lock
touch $lock_file
(set +x
exec </dev/null >/dev/null 2>&1
while [ -f $lock_file ]; do
load_avg1=$(calc "$(awk '{print $1}' /proc/loadavg) * 100 / $max_comp_streams")
if [ $load_avg1 -ge $high_load_threshold ]; then
write /proc/sys/vm/swappiness $high_load_swappiness
elif [ $load_avg1 -ge $medium_load_threshold ]; then
write /proc/sys/vm/swappiness $medium_load_swappiness
elif [ $load_avg1 -ge $low_load_threshold ]; then
write /proc/sys/vm/swappiness $low_load_swappiness
fi
sleep $load_sampling_rate
done) &
}
write() {
[ -f $1 ] && echo "$2" > $1 2>/dev/null
}
echo
trap 'e=$?; echo; exit $e' EXIT
# verbose
case $1 in
-d*)
[ -n "$LINENO" ] && export PS4='$LINENO: '
set -x
;;
esac
[ $(id -u) -eq 0 ] || {
echo "(!) must run as root"
exit 2
}
mkdir -p $temp_dir
# load user config
for i in "${0}.conf" /etc/zram-swap-manager.conf \
$mod_data/config.txt
do
[ -f "$i" ] && {
. "$i"
break
}
done
[ -f $magisk_mod/busybox.sh ] && . $magisk_mod/busybox.sh
# default settings
: ${comp_algorithm:=auto}
: ${comp_ratio:=288}
: ${mem_percent:=33}
: ${mem_total:=$(awk '/^MemTotal:/{print $2}' /proc/meminfo)}
: ${mem_limit:=$(calc "$mem_total * $mem_percent / 100 * 1024")}
: ${disksize:=$(calc "$mem_limit * $comp_ratio / 100")}
: ${max_comp_streams:=$(( $(cut -d- -f2 /sys/devices/system/cpu/present) + 1 ))}
: ${swap_device:=$([ -d /data/adb ] && echo /dev/block/zram || echo /dev/zram)}
: ${dynamic_swappiness:=true}
: ${load_sampling_rate:=60}
: ${high_load_threshold:=90}
: ${high_load_swappiness:=80}
: ${medium_load_threshold:=45}
: ${medium_load_swappiness:=90}
: ${low_load_threshold:=0}
: ${low_load_swappiness:=100}
: ${vm:=swappiness=85 page-cluster=0}
case $1 in
-*c) shift; edit_config "$@";;
-*e) mem_estimates;;
-*n) prep_exec; swap_on;;
-*f) prep_exec; swap_off;;
-*v) echo $version;;
-*r) prep_exec; swap_off 2>/dev/null; swap_on;;
-*s) swappinessd;;
-*t) stop_swappinessd; write /proc/sys/vm/swappiness $swappiness;;
-*u) shift; $magisk_mod/uninstall.sh "$@" 2>/dev/null || zram-swap-manager-uninstall "$@";;
*) echo "$info
Options:
-d[opt] verbose (set -x)
-c edit config w/ \"\$@\" | \$EDITOR | vim | vi | nano
-e memory estimates
-n swap_on
-f swap_off
-v version
-r swap_off; swap_on
-s [re]start swappinessd
-t stop swappinessd
-u uninstall";;
esac