Re: [Xen-devel] Memory and Xen

[Bin Ren <br260@xxxxxxxxx>]

On 15 Nov 2003, at 23:31, Matt Ayres wrote:

> My reason for thinking of this is in the event that a new domain must 
> be
> started up on a server, but there is no un-allocated memory to start
> it.  Other domains may have memory allocated, but only actually be 
> using
> 1/4 of it.  In cases like this it would make sense to let the new 
> domain
> "borrow" the memory.  As mentioned above, if the domain who was
> previously was not using all of it's memory suddenly does want to use 
> it
> there should be a method to swap pages out.
First, we support swap in all the domains, including Domain 0. In this
aspect, XenoLInux is the same as conventional Linux.

Second, we don't want a domain to borrow memory from others. Every
domain has a guaranteed number of physical memory pages.
All the resources reserved for a domain will be accounted and paid for
by the customer who uses XenoServer. It's irrelevant that when
a new domain is started, other domains' performances have to
downgrade.

You may want to go to http://www.cl.cam.ac.uk/Research/SRG/netos/xeno/
to see the goal of Xen and XenoServer.

-- Bin



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