Re: pmap_extract(9) (was Re: xmd(4) (Re: XIP))

[Eduardo Horvath <eeh%NetBSD.org@localhost>]

On Fri, 5 Nov 2010, Masao Uebayashi wrote:

> On Mon, Nov 01, 2010 at 03:52:11PM -0700, Matt Thomas wrote:

> > Indeed.  Also consider that pmap's are designed to have to have
> > fast V->P translations, using that instead of UVM makes a lot of
> > sense.
> 
> How does locking works?
> 
> My understanding is page tables (per-process) are protected by
> struct vm_map (per-process).  (Or moving toward it.)

No, once again this is MD.  For instance sparc64 uses compare and swap 
instructions to manipulate page tables for lockless synchronization.

Eduardo