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xen-devel
Re: [Xen-devel] Memory and Xen
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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