Chapter 4 - DSpace at Waseda University

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Chapter 1 1.3 Contribution When developing a project, there are a variety of SDK and various debugging methods [12] [23] [38] [40]. However, while developing embedded systems, developers should solve problems by using limited tools and debugging methods [36]. Debugging and performance tuning [41] [56] are an important part in the system development. The system developer for debugging and performance tuning needs error messages that generated by file system errors, network errors [34], hard drive errors, and memory errors in the systems. In addition, it is important to catch where the problem happened and what it is. The proposed system using the event log is the following contributions. � Among the huge event logs, we can find the problem easily. � Separating the error data from whole data and we can analyze only the error data. � Analyzing the event logs, we can analyze the cause of the problem. We would like to suggest solutions to solve the problems in the kernel and to improve performance by finding and analyzing problems effectively. 1.4 Outline The dissertation is structured as follows. Chapter 1 talks about the research motivation, challenges and contributions. In Section 2, we explain all the background knowledge which is related to our work. We 6
7 Chapter 1 explain about embedded systems, the Linux kernel and embedded Linux. In addition, we describe system monitoring, event log and problem analysis to solve the problems. In Section 3, we explain related work, reviews and discussions. We explain the tools for system monitoring and event log analysis. In Section 4, we propose a new system framework. Our system framework has three main layers: Detection Layer, Separation Layer and Analysis Layer. We explain each layer in details. In Section 5, we analyze the kernel timer by using the kernel analysis system that we propose. We analyze the high resolution timer latency problem. Finally, in Section 6, we explain a conclusion and suggest possible future directions.
Page 1: Analyzing Real-Time Performance Pro
Page 4 and 5: to propose a solution for the probl
Page 6 and 7: 2.5 Event Log …………………
Page 8 and 9: 6. Conclusions and Future Work 6.1
Page 10 and 11: List of Figures 2.1 User-space vs.
Page 12 and 13: 5.12: One of the reasons of HRTimer
Page 14 and 15: Chapter 1 functions or equipped wit
Page 16 and 17: Chapter 1 huge losses in cost. For
Page 20 and 21: Chapter 2 Background 2.1 Embedded S
Page 22 and 23: Chapter 2 memory and to manage syst
Page 24 and 25: Chapter 2 2.3 Embedded Linux An emb
Page 26 and 27: Chapter 2 � How often CPU accesse
Page 28 and 29: Chapter 2 2.6 Problem Analysis Figu
Page 30 and 31: Chapter 2 � To count time accurat
Page 32 and 33: Chapter 2 board. Its clock signal i
Page 34 and 35: Chapter 3 hardware such as SoC (Sys
Page 36 and 37: Chapter 3 shows how useful the logg
Page 38 and 39: Chapter 3 free to check memory. How
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Page 42 and 43: Chapter 3 In Figure 3.4, through Me
Page 44 and 45: Chapter 3 Figure 3.6: Event logging
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Page 48 and 49: Chapter 4 due to its large amount.
Page 50 and 51: Chapter 4 Advantage of analysis by
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Page 56 and 57: Chapter 4 4.2.2 Separation Layer Fi
Page 58 and 59: Chapter 4 4.2.3 Analysis Layer Figu
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Page 62 and 63: Chapter 4 Table 4.1: Important para
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Chapter 5 5.1 Timer Latency When a
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Chapter 5 mode [31]. In opposite, p
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Chapter 5 Figure 5.4 shows the inte
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Chapter 5 latency. Figure 5.5 shows
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Chapter 5 Figure 5.6 Interface of s
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Chapter 5 Table 5.1: Result of Dete
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Chapter 5 Table 5.2: Result of Anal
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Chapter 5 most of time. Especially,
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Chapter 5 Figure 5.13: Result of an
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Chapter 5 Figure 5.16: Result of ex
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Chapter 5 5.6 Summary We analyzed l
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Chapter 6 In embedded systems, ther
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Chapter 6 Figure 6.1: Real-Time Arc
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Appendix A.1 RTOS Commonly, a goal
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Appendix software, real-time OS mus
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Appendix critical task and non-crit
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Appendix � Portability CABI shoul
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Bibliography [1] L. Abeni, A. Goel,
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Bibliography [21] C. Yuan, N. Lao,
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Bibliography [38] Magdalena Balazin
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Bibliography [56] Balakrishnan, S.;
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Acknowledgements I would firstly li
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