Re: Why *not* rmap, anyway?

[Daniel Phillips <phillips@bonn-fries.net>]

On Tuesday 07 May 2002 21:50, William Lee Irwin III wrote:
> On Tuesday 07 May 2002 21:25, William Lee Irwin III wrote:
> >> Procedural interfaces to pagetable manipulations are largely what
> >> the BSD pmap and SVR4 HAT layers consisted of, no?
> 
> On Tue, May 07, 2002 at 09:47:28PM +0200, Daniel Phillips wrote:
> > They factor the interface the wrong way for Linux.  You don't want
> > to have to search for each (pte *) starting from the top of the
> > structure.  We need to be able to do bulk processing.  The BSD
> > interface just doesn't accomodate this.
> 
> Generally the way to achieve this is by anticipating those bulk
> operations and providing standardized methods for them. copy_page_range()
> and zap_page_range() are already examples of this. For other cases,
> it's perhaps a useful layer inversion.

What I'm really talking about is how you'd reimplement copy_page_range,
zap_page_range, and the other 4-5 primitives that use the 3 nested loops
style of traversing the i86-style page table structure.

-- 
Daniel
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