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xen-devel
[Xen-devel] Re: [patch 15/26] Xen-paravirt_ops: Add apply_to_page_range(
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To: |
Ingo Molnar <mingo@xxxxxxx> |
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Subject: |
[Xen-devel] Re: [patch 15/26] Xen-paravirt_ops: Add apply_to_page_range() which applies a function to a pte range. |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Fri, 16 Mar 2007 10:08:43 -0700 |
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Cc: |
Zachary Amsden <zach@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christoph Lameter <clameter@xxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Fri, 16 Mar 2007 10:07:46 -0700 |
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Ingo Molnar wrote:
> nice one! I suspect we could simplify some of the less
> performance-critical open-coded pagetable walker loops in the kernel
> with this? (i'm not even sure it's all that much of a performance loss
> to pass a function pointer around - would be nice to convert say
> mprotect() to this and see the performance difference?)
>
apply_page_to_range has the side-effect of allocating all the pagetable
levels for the address range it walks. Xen uses this to populate
pagetables (for example, build out the pagetable, and let the hypervisor
plug a mapping into the pte page).
If that's OK for the other uses, then it should be good.
J
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- [Xen-devel] Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include return register, (continued)
[Xen-devel] Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include return register, Ingo Molnar
[Xen-devel] [patch 07/26] Xen-paravirt_ops: Allow paravirt backend to choose kernel PMD sharing, Jeremy Fitzhardinge
[Xen-devel] [patch 10/26] Xen-paravirt_ops: rename struct paravirt_patch to paravirt_patch_site for clarity, Jeremy Fitzhardinge
[Xen-devel] [patch 15/26] Xen-paravirt_ops: Add apply_to_page_range() which applies a function to a pte range., Jeremy Fitzhardinge
[Xen-devel] [patch 04/26] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries, Jeremy Fitzhardinge
[Xen-devel] [patch 09/26] Xen-paravirt_ops: remove HAVE_ARCH_MM_LIFETIME, define no-op architecture implementations, Jeremy Fitzhardinge
[Xen-devel] [patch 11/26] Xen-paravirt_ops: Use patch site IDs computed from offset in paravirt_ops structure, Jeremy Fitzhardinge
[Xen-devel] [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable, Jeremy Fitzhardinge
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