Re: [Xen-devel] Copy-on-write memory to allow many more xenU domains per machine

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> I thought the idea would be to have a 'clone' primitive that would work
> in a similar way to Unix fork? The clone would start off sharing all
> pages, although a lot of them would get copied fairly quickly. Does
> anyone have an idea of what proportion or number of pages in a Linux
> system stay constant (and are not paged out) after boot?

We've already done some work on implementing very lightweight VM
checkpoints, for purposes of debugging and s/w fault
tolerance. 'VM clone' is on the todo list, but I think it'll be a
while before this makes it into a stable release.

Ian



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