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Re: pmap_extract(9) (was Re: xmd(4) (Re: XIP))
On Fri, Nov 05, 2010 at 05:36:53PM +0000, Eduardo Horvath wrote:
> 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.
I don't like "it's MD, period" attitude. That solves nothing.
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