[electroly]

I believe "zswap" is the main kernel feature supporting memory compression.

https://lwn.net/Articles/545244/ -- I believe this article was written a bit before zswap was merged into the kernel.

[ribasushi]

zswap is not transparent memory compression: it specifically focus on compressed paged-out faults.

I am not aware of anything that goes the MacOS way: actual compressed ram, with fast in-cpu-cache decompression of the compressed payload carried over the dram bus.

This seems to be the current state of the world: https://unix.stackexchange.com/a/374579