LZHAM 1.0 Isn't Too Far Away For Compression Of Interest To Game Developers

[uid313]

How feasible is it to compress parts of your internal memory? Like data that hasn't been accessed for an hour. Or data that is about to get swapped.

It is feasible and possible.
There are patches for the Linux kernel to do so called zram.

http://lwn.net/Articles/545244/

[peppercats]

What reason is there for me to use this over LZ4?

Apologies to the author for this, got some time to do some research and LZHam looks excellent. I assumed it had comparable compression ratios to LZ4.
I'll be keeping an eye on this for a 1.0 release.