Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries

Andi Kleen
2007-02-21T22:17:12Z

On Wednesday 21 February 2007 21:52, Jeremy Fitzhardinge wrote:
> Add a set of accessors to pack, unpack and modify page table entries
> (at all levels). This allows a paravirt implementation to control the
> contents of pgd/pmd/pte entries. For example, Xen uses this to
> convert the (pseudo-)physical address into a machine address when
> populating a pagetable entry, and converting back to pphys address
> when an entry is read.

Do you have some lmbench numbers before/after this change?
iirc at least fork and exit do a lot of pte accesses in various forms.
If it's measurable it might be needed to patch those for the native case.

-Andi