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...a was the most ambitious system to have the separation of kernel policy and mechanism as one of its central tenets [48]. Modern revisitations of microkernels have also argued for kernel extensibility =-=[1, 15, 36, 39, 44]-=-. The most important difference between our work and previous approaches is the explicit view that the kernel should not provide high-level core abstractions. In other systems, the effective operating...

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... by sending a suspend message to that thread’s thread port even if the requesting thread is on another node in a network. The design of Mach draws heavily on CMU’s previous experience with the Accent =-=[8]-=- network operating system, extending that system’s facilities into the multiprocessor domain: • the underlying port mechanism for communication provides support for object-style access to resources an...

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...ne ‘of the first academically reported message-based systems, was characterized by an elegant design and problematic performance. Other systems followed, including Thoth [9, 141, DEMOS [3] and Accent =-=[28]-=-, but performance remained a key concern. A major focus of ou.r research with the V kernel has been exploring ways to achieve good interprocess communication performance. tion between the application ...

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...ork. 2 Related Work Many research operating systems have been developed that implemented process migration mechanisms, with a focus on using migration for load balancing. These systems include Accent =-=[31]-=-, Amoeba [25], Charlotte [6], Chorus [33], MOSIX [7], Sprite [12], and V [11]. These operating systems provided a single system image across a cluster of machines and providing migration throughout th...

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...aults, which Asbestos uses to support policies such as preventing one process from talking to another. Asbestos uses communication ports similar to those of previous message-passing operating systems =-=[6, 24, 30, 35, 36, 41]-=-, some of which can confine executable content [14], others of which have had full-fledged mandatory access control implementations [5]. Asbestos uses the same namespace—handles—for both ports and com...

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...plexity, much recent work has focused on toois that assist in the construction and programming of distributed systems and applications. Examples include message-based operating systems such as Accent =-=[22]-=- and V [12], remote procedure call facilities such as Xerox RPC [5], and languages such as Argus [20] and the Eden Programming Language (EPL,) [7]. There three approaches to distribution represent a s...

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... and the overall performance of the Mach operating system. 2. Early Work in Virtual Memory/Message Integration The design of Mach owes a great deal to a previous system developed at CMU called Accent =-=[15]-=-. A central feature of Accent was the integration of virtual memory and communication. Large amounts of data could be transmitted between processes in Accent with extremely high performance through it...