Yeah, it seems the "transparent" is not a very good idea in the end. I made a basic 2MiB page allocator recently, I know I will add explicit 1GiB/512GiB(4-level

Yeah, it seems the "transparent" is not a very good idea in the end. I made a basic 2MiB page allocator recently, I know I will add explicit 1GiB/512GiB(4-levels page tables) somewhen in the future. But since it is rare, I may go "brutal" with 2MiB pages continuity scanning at allocation time, the alignment constraint lighten a lot that scanning.