On Thu, 12 Feb 1998, Alan Cox wrote:
> > Has anybody ever looked into implementing that? What architectures besides
> > MIPS could take advantage of such a feature?
> On the intel its a huge win to map PCI frame buffers using 4Mbyte pages, but
> the kernel mmap really can't hack the idea right now. A pity cos if you
> hack it in and make sure you never unmap it you get 2-3% better X performance
i tried to hack this half a year ago, but had to find out that 4MB pages
are only valid for kernel mappings, which means we'd have to make X a ring
0 process too ...