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Prediction-Based Micro-Scheduler: Toward Responsive Scheduling of General-Purpose Operating Systems

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2 Author(s)
Jupyung Lee ; Div. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon ; Kyu Ho Park

In this paper, we propose a novel scheduling technique to improve the responsiveness of a real-time process while maintaining relative execution rates of non-real-time processes, called the prediction-based micro-scheduler. It runs upon an existing macro-scheduler and it conditionally rearranges the scheduling pattern generated by the macro-scheduler based on urgent interval prediction and lock hold time prediction. The rearrangement occurs if one process seeks to enter a long nonpreemptible section and the operation is predicted to significantly disturb the future execution of a real-time process. We implemented the prototype on Linux 2.6.19. Experimental results show that the average OS latency of a real-time process is reduced up to 34 percent of the original one while still maintaining relative execution rates of non-real-time processes. Moreover, the performance degradation caused by the micro-scheduler does not exceed 5 percent.

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Computers, IEEE Transactions on  (Volume:58 ,  Issue: 5 )