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The trend of digital convergence makes multitasking common in many digital electronic products. Some applications in those systems have inherent real-time properties, while many others have few or no timeliness requirements. Therefore the embedded Linux kernels, which are widely used in those devices, provide real-time features in many forms. However, providing real-time scheduling usually induces throughput degradation in heavy multitasking due to the increased context switches. Usually the throughput degradation becomes a critical problem, since the performance of the embedded processors is generally limited for cost, design and energy efficiency reasons.
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