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Outline. Extensibility, Safety and Performance in the SPIN Operating System Brian Bershad, Stefan Savage, Przemyslaw Pardyak, Emin Gun Sirer, Marc E. Fiuczynski, David Becker, Craig Chambers, Susan Eggers MSDOS: Extensibility and Performance Mach: Extensibility and Safety

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Outline

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  1. Outline • Extensibility, Safety and Performance in the SPIN Operating System • Brian Bershad, Stefan Savage, Przemyslaw Pardyak, Emin Gun Sirer, Marc E. Fiuczynski, David Becker, Craig Chambers, Susan Eggers • MSDOS: Extensibility and Performance • Mach: Extensibility and Safety • UNIX: Safety and Performance • Goal: SPIN should have all three CSE 542: Operating Systems

  2. Extensibility • Applications can dynamically extend system to provide specialized services • Put extension code in the kernel • Communication cost is cheap • SPIN implements minimal services: Processor execution state, MMU, IO/DMA, Dynamic linker • Compare with • Micro-kernels: Cost to cross protection boundaries • Library based: Offers minimal protection boundaries CSE 542: Operating Systems

  3. Safety • Kernel is protected from actions of extension • Use language protection features • Static safety • Modula3 • Memory safe • Interfaces for hiding resources • Cheap capabilities • Restrict access to interfaces at dynamic link-time CSE 542: Operating Systems

  4. Performance • Extensibility and safety have low cost • Extensions provide specialized service • Customized for the specific task with no extraneous code • Extensions close to kernel service • Invocations cheap • Low latency response to interrupts CSE 542: Operating Systems

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