Maynard Handley (name99.delete@this.name99.org) on May 14, 2013 5:49 pm wrote:
> There is trivial scope for wider use of 2MiB pages. For example, OSX uses a magazine malloc, which uses
> three zones for small, medium and large allocations. The small and medium zones are initially allocated
> as 2MiB in size, and grow by 2MiB a pop. (Large allocations are allocated as some number of 4KiB pages.)
>
> It would (IMHO) be an appropriate optimization to make these small and medium zones allocated right off the
> bat as 2MiB pages. (For all I know, the latest OSX does this, but Apple is so secretive that WTF knows.)

Apple is secretive about many things, but not that. They still post source. I'm sure if they're supporting 2MiB pages, evidence can be found in the kernel:

http://opensource.apple.com/source/xnu/xnu-2050.22.13/