Zram is actually a general purpose block device, you can format it with ext4 and have a compressed RAM disk. There is also zswap, which is a transparent compre

Zram is actually a general purpose block device, you can format it with ext4 and have a compressed RAM disk. There is also zswap, which is a transparent compressed RAM cache in front of your cache partition. Most distros have it enabled by default, so make sure you don't use it together with swap in zram.