ZRAMSWAP-BACKING

These files can be used to replace the existing zramswapon and zramswapoff files in /usr/sbin/ to...

1. Create a hidden file called /.zramswap in the root directory, with appropriate permissions and configuration for a swap file (works on btrfs!)
2. Preallocate the file to match the size of your zram disk
3. Set up a loopback device (/dev/loop0) connected to the file
4. Configure a ZRAM Swap drive in memory to use the loopback device as a backing device

I've also added a few of my own lines for configuration, including:

• Using ZSTD compression
• Sending incompressible pages to the backing device instead of keeping them in RAM
• Enabling DISCARD on the swap device, which helps keep zram space smaller and more performant

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External links for reference:

• (https://unix.stackexchange.com/questions/581243/using-loopdev-for-zram-writeback-feature)
• (https://giorgos.sealabs.net/systemd-unit-to-activate-loopback-devices-before-lvm.html)