O'Reilly logo

vSphere High Performance Cookbook by Prasenjit Sarkar

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Virtual memory reclamation techniques

Virtual machines perform memory allocation in the same way, as an operating system handles memory allocation and deallocation. The guest operating system frees itself from a piece of physical memory by adding the memory page numbers to the guest free list.

The guest operating system free list is not accessible to the hypervisor and thus it is difficult for the hypervisor to know when to free host physical memory and when the guest physical memory is freed. The hypervisor is completely unaware of which pages are free or allocated in the guest operating system, and because of this the hypervisor cannot reclaim host physical memory when the guest operating system frees guest physical memory.

So VMware hypervisor ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required