Re: RFC: stop having a single global page size

[Masanobu SAITOH <msaitoh%execsw.org@localhost>]

(2014/01/31 18:14), Martin Husemann wrote:
> 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

 and so called the super pages that FreeBSD does.

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                SAITOH Masanobu (msaitoh%execsw.org@localhost
                                 msaitoh%netbsd.org@localhost)