Low memory, apps crashing - change zram settings or add swapfile? [4.x]

General
70

I see your point expecially because the script is on a shared link Google drive.

Therefore, I am going to paste here the full code of the script:

#/bin/bash
#
# (C) 2023, Roberto A. Foglietta <roberto.foglietta@gmail.com>
#           Released under MIT license for SailFish OS 4.5.19
#
#################################################################

if [ "$(whoami)" != "root" ]; then
    echo "This script should be executed by root"
    echo "Please, insert the password or CTRL-C"
    devel-su /bin/bash $0 $1
    exit $?
fi

pwsvenagain=0
pwsvstate=enabled
power_saving_state() {
    pwsvstate=$(mcetool | sed -ne "s,^Power saving mode: *\([endisabl]*\) .*,\\1,p")
    echo "Power saving mode: $pwsvstate" 
}

power_saving_toggle() {
    if [ "$1" = "disabled" ]; then
        echo "Enabling power state..."
        mcetool --set-power-saving-mode=enabled
        power_saving_state
    elif [ "$1" = "enabled" ]; then
        echo "Disabling power state..."
        mcetool --set-power-saving-mode=disabled
        power_saving_state
    else
        echo "USAGE: power_saving_toggle enable|disable"
        return 1
    fi
    return 0
}

mtavail=no
mcetool_check() {
    if ! which mcetool >/dev/null; then
        echo -e "\nThis script wishes to have mce-tools installed"
        echo    "because swapoff will fail with power saving enabled."
        echo    "You can disable power saving manually or you can"
        echo    "accept to reboot the device to complete the resize"
        echo    "or you can install with pkcon install -y mce-tools"
        echo -e "\nPress ENTER to continue or CTRL-C to abort."
        read
     fi
     mtavail=yes
}

zram_swap_change() {
    echo "Disabling and resizing the zRAM swap..."
    sleep 0.25; echo 1 > /proc/sys/vm/drop_caches
    if [ "$swapuse" != "off" ]; then
        if ! swapoff -v $blockname; then
            echo -e "\nWARNING: the on-line resize failed, reboot required"
            return 1
        fi
    fi
    swapusage
    zramctl -s $1 $blockname
    mkswap $blockname
    return 0
}

zram_swap_resize() {
    mb=$((${1:-1024} + 0))
    zramsize=$((mb*1024*1024))
    blockname=/dev/block/zram0
    filename=$(ls -1 /vendor/etc/fstab.pdx20?)
    swapusage() { free -m | grep -i swap | tr -s ' ' | sed "s,0 0 0,off,"; }
    swapuse=$(swapusage | awk '{ print $2 }')
    
    printf "Current size of zram0: %s Mb\n" $swapuse
    
    zram_swap_change $zramsize || resized=no
	
    echo -e "\nThe zram size at the next boot is set in $filename by this line"
    sed -i "s|\(^"$blockname".*size\)=[0-9]*,max|\\1="$((mb*1024*1024))",max|" \
        $filename
    grep zram $filename | tr -s ' '

    if [ "$resized" != "no" ]; then
        echo -e "\nEnabling the zRAM swap..."
        swapusage; swapon -v /dev/zram0; swapusage
    fi
    echo
}

mcetool_check
power_saving_state
if [ "$pwsvstate" = "enabled" ]; then
    power_saving_toggle enabled
    pwsvenagain=1
fi
zram_swap_resize $1
if [ "$pwsvenagain" = "1" ]; then
    power_saving_toggle disabled
fi

Probably the best I can do, is coverting it into a Patch Manager patch which create this file into /usr/bin folder in such a way the user can execute it trusting into the community surveillance.

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