[haiku-development] Re: memory page compression
- From: Michael Crawford <mdcrawford@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Wed, 22 Jul 2009 07:36:31 -0700
At the Xen Summit at Oracle's headquarters a few month ago, someone
gave a talk on sharing memory pages between Xen DomUs (guest operating
systems) by comparing checksums of page data.
Only one copy of two or more identical pages need be kept resident.
You'd use the MMU to implement a copy-on-write system, so that if one
of the DomUs tried to change a page that was shared, a fresh copy
would be created for its private use.
Conceivably this sort of thing could be done on any operating system,
even without the use of a virtual machine, to take advantage of any
pages that happened to have identical content.
I don't know how likely that would be to ever happen in practice, but
perhaps it would be worth the effort to investigate.
Mike
--
Michael David Crawford
mdcrawford at gmail dot com
GoingWare's Bag of Programming Tricks
http://www.goingware.com/tips/
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