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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: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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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: |
Ingo Molnar <mingo@xxxxxxx> |
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Date: |
Fri, 16 Mar 2007 10:19:40 +0100 |
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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 02:19:32 -0700 |
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* Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> Add a new mm function apply_to_page_range() which applies a given
> function to every pte in a given virtual address range in a given mm
> structure. This is a generic alternative to cut-and-pasting the Linux
> idiomatic pagetable walking code in every place that a sequence of
> PTEs must be accessed.
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?)
Acked-by: Ingo Molnar <mingo@xxxxxxx>
Ingo
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