Re: [Xen-devel] Odd mapping behavior with map_pages_to_xen

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 16 Mar 2006, at 19:05, Arne Mejlholm wrote:

> > If you build Xen with 'debug=y' option then I expect you'll find your 
> > code works fine. :-)
> You expected correctly indeed. I take it that enabling debug either 
> forces the mappings to be replaced (non-lazily) or does it switch 
> entirely to 4kb pages?
There is no code to replace the mappings in non-idle pagetables. So 
it's the latter -- to support heap guard pages, we map the entire Xen 
heap with 4kB pages in debug builds.
In non-debug builds the superpages are used in all pagetables to map 
Xen heap. It's to improve TLB utilisation.
 -- Keir


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