Re: RFC: stop having a single global page size

[Martin Husemann <martin%duskware.de@localhost>]

On Fri, Jan 31, 2014 at 12:59:15AM -0800, Matt Thomas wrote:
> Why would anyone want this?  Say you have a system in which the MMU can have
> per translation table page sizes.  a 16KB page size might be desirable for the
> kernel and for LP64 processes.  If you are running a ILP32 process, possibly
> of an older architecture, you might want to use a 4KB page size.

I guess another usage is a (huge) framebuffer/aperture mmap'd by the
userland driver, where you could easily save a lot TLB entries by using
1 MB pages (or bigger) instead of 4/8k ones. I think Solaris does this.

Martin