> FYI, Android has had zRAM support since KitKat, which is from (checking notes) 2013. Same year as iOS.

iOS compresses regular pages, it doesn't need to go through the swap system to compress/decompress them.

This imho should end up having better savings and performance. zswap when it gains support for non-swap usage may close the gap.

Maybe it's not technically a "swap system" but I'll be shocked if they're not doing effectively the same thing. How could you avoid having active uncompressed pages and inactive compressed pages? The amount of tracking you'd need to do to use compressed pages directly seems like an impossible amount of overhead.