Re: [PATCH v4 06/10] KVM: MMU: fast path of handling guest page fault

Avi Kivity
2012-05-06T09:36:39Z

On 05/05/2012 05:08 PM, Marcelo Tosatti wrote:
> It would be better if all these complications introduced by lockless
> updates can be avoided, say using A/D bits as Avi suggested.

Note that using A/D bits introduces new tradeoffs (when just a few bits
are dirtied per iteration, we reduce guest overhead, but increase host
overhead, since it has to scan a large number of sptes), and also a
large fraction of deployed systems don't have A/D bits support. But it
should affect our thinking - since in the long term all hosts will have it.

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