Re: [PATCH 0/4] KVM: Dirty logging optimization using rmap

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On 11/29/2011 07:20 PM, Avi Kivity wrote:


> We used to have a bitmap in a shadow page with a bit set for every slot
> pointed to by the page.  If we extend this to non-leaf pages (so, when
> we set a bit, we propagate it through its parent_ptes list), then we do
> the following on write fault:
> 


Thanks for the detail.

Um, propagating slot bit to parent ptes is little slow, especially, it
is the overload for no Xwindow guests which is dirty logged only in the
migration(i guess most linux guests are running on this mode and migration
is not frequent). No?

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