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Multitasking without compromise:: a virtual machine evolution

ACM SIGPLAN NOTICES 2001年第11期36卷 125-138页

作者： Czajkowski, G Daynès, L Sun Microsyst Labs Mt View CA 94043 USA

The Multitasking Virtual Machine (called from now on simply MVM) is a modification of the Java (TM) virtual machine. It enables safe, secure, and scalable multitasking. Safety is achieved by strict isolation of applications from one another. Resource control mechanisms augment security by preventing some denial-of-service attacks. Improved scalability results from an aggressive application of the main design principle of MVM: share as much of the runtime as possible among applications and replicate everything else. The system can be described as a 'no compromise' approach - all the known APIs and mechanisms of the Java programming language are available to applications. MVM is implemented as a series of carefully tuned modifications to the Java HotSpot (TM) virtual machine, including the dynamic compiler. This paper presents the design of MVM, focusing on several novel and general techniques: an in-runtime design of lightweight isolation, an extension of a copying, generational garbage collector to provide best-effort management of a portion of the heap space, and a transparent and automated mechanism for safe execution of user-level native code. MVM demonstrates that multitasking in a safe language can be accomplished with a high degree of protection, without constraining the language, and with competitive performance characteristics.

关键词： Java virtual machine application isolation resource control native code execution

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Multitasking without comprimise: a virtual machine evolution 01

Multitasking without comprimise: a virtual machine evolution

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Proceedings of the 16th ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications

作者： Grzegorz Czajkowski Laurent Daynès Sun Microsystems Laboratories 2600 Casey Avenue Mountain View CA

ISBN: (纸本)9781581133356

The multitasking virtual machine (called from now on simply MVM) is a modification of the Java virtual machine. It enables safe, secure, and scalable multitasking. Safety is achieved by strict isolation of application from one another. Resource control augment security by preventing some denial-of-service attacks. Improved scalability results from an aggressive application of the main design principle of MVM: share as much of the runtime as possible among applications and replicate everything else. The system can be described as a 'no compromise'approach --- all the known APIs and mechanisms of the Java programming language are available to applications. MVM is implemented as a series of carefully tuned modifications to the Java HotSpot virtual machine, including the dynamic compiler. this paper presents the design of MVM, focusing on several novel and general techniques: an in-runtime design of lightweight isolation, an extension of a copying, generational garbage collector to provide best-effort management of a portion of the heap space, and a transparent and automated mechanism for safe execution of user-level native code. MVM demonstrates that multitasking in a safe language can be accomplished with a high degree of protection, without constraining the language, and and with competitive performance characteristics

关键词： resource control native code execution application isolation Java virtual machine

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