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

To: david.nospam.hopwood@xxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Copy-on-write memory to allow many more xenU domains per machine
From: Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>
Date: Mon, 25 Oct 2004 21:19:24 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx, Ian.Pratt@xxxxxxxxxxxx
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> 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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