Re: [Xen-devel] Copy-on write sharing

[Tim Deegan <tim@xxxxxxx>]

Hi, 

Please don't drop the list from Cc.  I have put it back.

At 09:50 +0000 on 31 May (1338457855), ???? wrote:
> Hi, I just read about the source code (mainly the mem_sharing.c) that
> you mentioned before, but it seemed not like what I was looking for,
> and it doesn't make use of the rbtree for page sharing.

mem_sharing.c is just the mechanism for having two VMs share a page.
The choices of which pages to share are left to the tools.  As I said
the in-tree Xen tools don't currently have a good way to select pages to
share (though there are some out-of-tree users).

> I felt that the functionality of this mem_sharing.c file is not like
> the KSM(kernel samepage mechanism), which operates in the KVM(kernel
> virtual machine).

That's right.  KVM reuses linux's existing in-kernel mechanism for
finding and sharing suitable pages.

Tim.

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