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xen-devel
[Xen-devel] Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors
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virtualization@xxxxxxxxxxxxxx |
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Subject: |
[Xen-devel] Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries |
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From: |
Andi Kleen <ak@xxxxxxx> |
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Date: |
Wed, 21 Feb 2007 23:15:12 +0100 |
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Cc: |
Chris Wright <chrisw@xxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx |
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Wed, 21 Feb 2007 14:16:54 -0800 |
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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
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