Messages in this thread | | | Subject | Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries | From | Rusty Russell <> | Date | Thu, 22 Feb 2007 10:20:02 +1100 |
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On Wed, 2007-02-21 at 23:15 +0100, Andi Kleen wrote: > 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.
Yes, __mkpte must be patched to avoid performance embarrassment.
Jeremy, did you want me to do this, or are you happy to? Rusty. PS. I really must revise my "paravirt-ops counter" patch which tallies how much each op is getting called.
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