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Re: [Xen-devel] What code is related to the writable page?

from [Mark Williamson]

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Subject:	Re: [Xen-devel] What code is related to the writable page?
From:	Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date:	Fri, 16 Mar 2007 01:52:05 +0000
Cc:	Hwandori <hwandori@xxxxxxxxx>
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On Saturday 10 March 2007 04:26, Hwandori wrote:
> In xen 3.0.4-1 source, where is the *unhook/rehook page table
> implementation* which is important things in 'writable page table mode'.?
> I can't find it.

AFAIK it's not used in 3.0.4.  Writeable pagetable is emulated by trapping 
updates to leaf pagetables and applying them individually.

I believe there are some explicit calls in XenLinux to make batching of 
updates possible in the cases where this is important (which is what 
writeable pagetables was originally there fore).

This approach has been shown to have higher performance than the unhook/rehook 
implementation.

Cheers,
Mark

-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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