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SubjectRe: [patch 0/6] Guest page hinting version 7.
Jeremy Fitzhardinge wrote:

> That said, people have been looking at tracking block IO to work out
> when it might be useful to try and share pages between guests under Xen.

Tracking block IO seems like a bass-ackwards way to figure
out what the contents of a memory page are.

The KVM KSM code has a simpler, yet still efficient, way of
figuring out which memory pages can be shared.

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