Processes in KaffeOS: Isolation, Resource Management, and Sharing in Java

Single-language runtime systems, in the form of Java virtual machines, are widely deployed platforms for executing untrusted mobile code. These runtimes provide some of the features that operating systems provide: inter-application memory protection and basic system services. They do not, however, provide the ability to isolate applications from each other, or limit their resource consumption. This paper describes KaffeOS, a Java runtime system that provides these features. The KaffeOS architecture takes many lessons from operating system design, such as the use of a user/kernel boundary, and employs garbage collection techniques, such as write barriers. eOS architecture supports the OS abstraction of a process in a Java virtual machine. Each process executes as if it were run in its own virtual machine, including separate garbage collection of its own heap. The difficulty in designing KaffeOS lay in balancing the goals of isolation and resource management against the goal of allowing...

• Type: Conference
• Year: 2000
• Where: OSDI
• Authors: Godmar Back, Wilson C. Hsieh, Jay Lepreau
• Keywords: Java Virtual Machine, Operating System, OSDI 2000, Virtual Machine