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Re: [Xen-devel] Page sharing in Xen?

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Page sharing in Xen?
From: "Mike D. Day" <ncmike@xxxxxxxxxx>
Date: Wed, 12 Jul 2006 10:20:55 -0400
Cc: Jae-Wan Jang <jwjang@xxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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Keir Fraser wrote:

On 12 Jul 2006, at 03:38, Jae-Wan Jang wrote:

I want to know whether Xen shares pages between domains or not.
When I read "Memory Resource Management in VMware ESX server",
they use page sharing between domains with hash value of a page.
So I wonder that Xen uses this technique
or if not, is there anyone who is implementing this to Xen now or
willing to do so.

There is explicit page sharing in Xen, but the kind of automatic scheme described in that paper. This is largely because it's unclear how great the benefit would be in practice.

Page coalescing is a frequently requested feature, not just for Xen/x86 but for other platforms/Hypervisors. It would be good if we can incorporate it into Xen.


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