Managing Memory with the Balloon Driver
Moving on from compile time and installation issues to the serious day-to-day business of running Xen, we encounter the problem of memory. As we've mentioned, most Xen installations are limited in practice by physical memory.
Xen expends a great deal of effort on virtualizing memory; its approach is one of the defining features of paravirtualization, and it usually "just works," on a level low enough to ignore completely. However, it sometimes can benefit from a bit of attention by the administrator.
We've been dancing around the subject of memory oversubscription for a long time, and we'd better come clean: It is possible to assign a dynamic amount of memory to a domU, but we don't do it because it's not ...
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