Re: [Xen-devel] Any work on sharing of large multi-page segments?

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Tue, Mar 17, 2015 at 12:46 AM, Andrew Warkentin <andreww591@xxxxxxxxx> wrote:
> I was thinking more of explicit sharing of code rather than automatic
> deduplication (at least I'm assuming you're talking about the
> deduplication support that was added a while back).

Automatic deduplication has two halves: automatically identifying
pages which are duplicated, and then the actual mechanism of sharing
them.

Any deduplication code would run in as a process probably in domain 0,
and may be somewhat slow; but the actual mechanism of sharing is a
generic mechanism in the hypervisor which any client can use.  Jan is
suggesting that you might be able to use that interface to
pro-actively tell Xen about the memory pages shared between your
various domains.

 -George

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