Re: [Xen-devel] [PATCH] x86/mm: remove the linear mapping of the p2m tables

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.09.12 at 16:01, Tim Deegan <tim@xxxxxxx> wrote:
> # HG changeset patch
> # User Tim Deegan <tim@xxxxxxx>
> # Date 1347544824 -3600
> # Node ID a770d1c8448d73ccf2ec36a5322532c2e3c14641
> # Parent  5691e4cc17da7fe8664a67f1d07c3755c0ca34ed
> x86/mm: remove the linear mapping of the p2m tables.
> 
> Mapping the p2m into the monitor tables was an important optimization
> on 32-bit builds, where it avoided mapping and unmapping p2m pages
> during a walk.  On 64-bit it makes no difference -- see
> http://old-list-archives.xen.org/archives/html/xen-devel/2010-04/msg00981.html
>  

Is that also going to remain true when we won't be able to 1:1-
map all of the memory anymore once we break the current 5Tb
barrier? If not, it would probably be worthwhile keeping that
code.

Jan


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