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OSDI '02 Abstract
Memory Resource Management in VMware ESX Server
Carl A. Waldspurger, VMware Inc.
Abstract
VMware ESX Server is a thin software layer designed to
multiplex hardware resources efficiently among virtual machines
running unmodified commodity operating systems. This paper introduces
several novel ESX Server mechanisms and policies for managing memory. A
ballooning technique reclaims the pages considered least
valuable by the operating system running in a virtual machine. An
idle memory tax achieves efficient memory utilization while
maintaining performance isolation guarantees. Content-based
page sharing and hot I/O page remapping exploit
transparent page remapping to eliminate redundancy and reduce copying
overheads. These techniques are combined to efficiently support
virtual machine workloads that overcommit memory.
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