By Yair Wiseman, Song Jiang
Publish 12 months note: First released September 30 2009
As any program working on a working laptop or computer uses the working process, the aptitude effect of bettering parts reminiscent of reminiscence administration, procedure scheduling, dossier structures, and machine drivers is large. Advanced working platforms and Kernel functions: innovations and Technologies discusses non-distributed working structures that gain researchers, academicians, and practitioners intending to delve into this topic quarter and research extra in this very important box of research.
This leading edge booklet comprises an summary of topical matters, tools, and developments within the box of one-processor working platforms.
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Second, the shadow driver restarts the failed driver and brings it back to its pre-failure state. While the driver restarts, the shadow impersonates the kernel to the driver, responding to its requests for service. Together, these two functions hide recovery from the driver, which is unaware that a shadow driver is restarting it after a failure, and from the kernel and applications, which continue to receive service from the shadow. Once the driver has restarted, the active-mode shadow returns the driver to its pre-failure state.
2. 3. 4. Stack pages are allocated on demand. If a kernel process needs minimal stack only one page is allocated. Only kernel processes that need larger stacks will have more pages allocated. The stack pages allocated per kernel process need not be contiguous but rather non-contiguous physical pages are mapped contiguously by the MMU. Stack overflows can be caught and damage to other kernel process stacks prevented. Larger kernel stacks can be efficiently provided. This facilitates porting of code that has not been designed for minimal stack usage into the Linux kernel.
In addition, it is possible to implement an external failure detector, such as a user- or kernelmode agent, that notifies the controller of a failure. In all cases, the controller invokes the driver’s recovery manager. Recovery Managers The recovery manager is tasked with returning the system to a functioning state. Nooks supports three recovery managers. The default recovery manager is a kernel service that simply unloads the failed driver, leaving the system running but without the services of the driver.