Re: [Xen-devel] Regarding page table management changes from Xen v1 to Xen v2 (and v3)

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 26 Apr 2006, at 16:35, Himanshu Raj wrote:

> I am trying to understand the rationale behind this change. In 
> previous case,
> there would be no page faults due to page table updates and only one 
> hypercall.
> In the second case, there would be atleast 2 page faults due to PT 
> management
> activity, but no hypercalls. Besides, mapping and remapping with 
> different permissions
> imply removing this entry from TLB (which is hopefully being done with 
> invlpg).
> Benefit of latter approach only seems to be the removal of xen 
> specific linux
> code. Why was the approach changed? Could someone please shed some 
> light on
> this?
It's useful for batched updates (e.g., fork()) where the 2 faults are 
amortised across up to 1024 pte changes.
 -- Keir


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