Advanced Operating Systems and Kernel Applications: by Yair Wiseman, Song Jiang

By Yair Wiseman, Song Jiang

Publish yr note: First released September 30 2009
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As any program working on a working laptop or computer uses the working approach, the capability effect of enhancing parts reminiscent of reminiscence administration, technique scheduling, dossier platforms, and machine drivers is super. Advanced working structures and Kernel functions: suggestions and Technologies discusses non-distributed working structures that profit researchers, academicians, and practitioners meaning to delve into this topic zone and research extra in this vital box of analysis.

This leading edge booklet contains an outline of topical matters, equipment, and developments within the box of one-processor working platforms.

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With the restart recovery manager, calls into a driver that fails and subsequently recovers may return error codes because the recovery manager unloads the driver and invalidates open connections to the driver during recovery. As a result, clients of a recovered driver would themselves fail if they depend on the driver during or after recovery. For example, audio players stopped producing sound when a sound-card driver failed and recovered. For the same reason, the restart recovery manager cannot restart drivers needed by the kernel, such as disk drivers.

To ensure that the kernel does not see the driver “disappear” as it is restarted, the shadow retains objects that the kernel uses to request driver services. For example, the shadow does not release the device object for network device drivers. The remaining resources, not needed for recovery, are released. Reinitializing the Driver The shadow driver next “boots” the driver from a clean state.

Nooks isolates drivers within lightweight protection domains inside the kernel address space, where hardware and software prevent them from corrupting the kernel. After a driver fails, Nooks invokes shadow drivers, a recovery subsystem, to recover by restoring the driver to its pre-failure state. Device Driver Reliability Figure 2. The Nooks Isolation Manager as a layer between device drivers and the kernel. The black lines indicate the minor changes needed to each. design Nooks operates as a layer that is inserted between drivers and the OS kernel.

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