android_device_samsung_msm8996-common/rootdir/bin/init.qcom.post_boot.sh

#! /vendor/bin/sh

# Copyright (c) 2012-2013, 2016-2018, The Linux Foundation. All rights reserved.
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# Function from LineageOS/android_device_oneplus_oneplus3
function configure_zram_parameters() {
    MemTotalStr=`cat /proc/meminfo | grep MemTotal`
    MemTotal=${MemTotalStr:16:8}

    low_ram=`getprop ro.config.low_ram`

    # Zram disk - 75% for Go devices.
    # For 512MB Go device, size = 384MB, set same for Non-Go.
    # For 1GB Go device, size = 768MB, set same for Non-Go.
    # For 2GB Go device, size = 1536MB, set same for Non-Go.
    # For >2GB Non-Go devices, size = 50% of RAM size. Limit the size to 4GB.
    # And enable lz4 zram compression for Go targets.

    let RamSizeGB="( $MemTotal / 1048576 ) + 1"
    diskSizeUnit=M
    if [ $RamSizeGB -le 2 ]; then
        let zRamSizeMB="( $RamSizeGB * 1024 ) * 3 / 4"
    else
        let zRamSizeMB="( $RamSizeGB * 1024 ) / 2"
    fi

    # use MB avoid 32 bit overflow
    if [ $zRamSizeMB -gt 4096 ]; then
        let zRamSizeMB=4096
    fi

    if [ "$low_ram" == "true" ]; then
        echo lz4 > /sys/block/zram0/comp_algorithm
    fi

    if [ -f /sys/block/zram0/disksize ]; then
        if [ -f /sys/block/zram0/use_dedup ]; then
            echo 1 > /sys/block/zram0/use_dedup
        fi
        echo "$zRamSizeMB""$diskSizeUnit" > /sys/block/zram0/disksize

        # ZRAM may use more memory than it saves if SLAB_STORE_USER
        # debug option is enabled.
        if [ -e /sys/kernel/slab/zs_handle ]; then
            echo 0 > /sys/kernel/slab/zs_handle/store_user
        fi
        if [ -e /sys/kernel/slab/zspage ]; then
            echo 0 > /sys/kernel/slab/zspage/store_user
        fi

        mkswap /dev/block/zram0
        swapon /dev/block/zram0 -p 32758
    fi
}

# Let kernel know our image version/variant/crm_version
if [ -f /sys/devices/soc0/select_image ]; then
    image_version="10:"
    image_version+=`getprop ro.build.id`
    image_version+=":"
    image_version+=`getprop ro.build.version.incremental`
    image_variant=`getprop ro.product.name`
    image_variant+="-"
    image_variant+=`getprop ro.build.type`
    oem_version=`getprop ro.build.version.codename`
    echo 10 > /sys/devices/soc0/select_image
    echo $image_version > /sys/devices/soc0/image_version
    echo $image_variant > /sys/devices/soc0/image_variant
    echo $oem_version > /sys/devices/soc0/image_crm_version
fi

# Change console log level as per console config property
console_config=`getprop persist.console.silent.config`
case "$console_config" in
    "1")
        echo "Enable console config to $console_config"
        echo 0 > /proc/sys/kernel/printk
        ;;
    *)
        echo "Enable console config to $console_config"
        ;;
esac

# Enable ZRAM
configure_zram_parameters