Chapter 4 - DSpace at Waseda University

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Chapter 5 5.6 Summary We analyzed latency of HRTimer by using KAS that is not perfect solution for timer latency. There is not only one reason of latency in the kernel but also complex reasons of latency from the kernel such as the relation between processes, dependency with hardware interrupt (hardirq) [10] [19] and software interrupt (softirq). Thus, there’re so many reason of latency it’s impossible to solve the problem by one perfect solution. After high resolution timer latency experiment and analyzing event log, the most common problem is the priority of softirq. KAS evaluated problem of HRTimer, currently it is not possible to analyze other problems. However, it proved by using KAS along with the analysis of kernel timer, which is one of the most important and difficult problem in kernel. If a developer and a system administrator used the KAS that it is possible to analyze timer problems quickly and efficiently. 76
Chapter 6 Conclusions and Future Work In this chapter, we describe a conclusion, and point out the flow of KAS, and describe future work. 6.1 Conclusions Embedded systems are widely used in various fields. Especially an embedded Linux has many advantages in that it includes many strong points’ of Linux. However, sometimes the embedded Linux confronts complex problems because an embedded system is becoming complex rapidly. Sometimes the problems occur after system has launched. Therefore, not only the developer of the system but also the user of it has a possibility to be damaged by unexpected problems.
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Analyzing Real-Time Performance Pro
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to propose a solution for the probl
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2.5 Event Log …………………
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6. Conclusions and Future Work 6.1
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List of Figures 2.1 User-space vs.
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5.12: One of the reasons of HRTimer
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Chapter 1 functions or equipped wit
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Chapter 1 huge losses in cost. For
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Chapter 1 1.3 Contribution When dev
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Chapter 2 Background 2.1 Embedded S
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Chapter 2 memory and to manage syst
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Chapter 2 2.3 Embedded Linux An emb
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Chapter 2 � How often CPU accesse
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Chapter 2 2.6 Problem Analysis Figu
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Chapter 2 � To count time accurat
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Chapter 2 board. Its clock signal i
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Chapter 3 hardware such as SoC (Sys
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Chapter 3 shows how useful the logg
Page 38 and 39: Chapter 3 free to check memory. How
Page 40 and 41: Chapter 3 Figure 3.3: Process viewe
Page 42 and 43: Chapter 3 In Figure 3.4, through Me
Page 44 and 45: Chapter 3 Figure 3.6: Event logging
Page 46 and 47: Chapter 4 execution times, and whol
Page 48 and 49: Chapter 4 due to its large amount.
Page 50 and 51: Chapter 4 Advantage of analysis by
Page 52 and 53: Chapter 4 ways of debugging accordi
Page 54 and 55: Chapter 4 problem has occurred it f
Page 56 and 57: Chapter 4 4.2.2 Separation Layer Fi
Page 58 and 59: Chapter 4 4.2.3 Analysis Layer Figu
Page 60 and 61: Chapter 4 and a developer analyzes
Page 62 and 63: Chapter 4 Table 4.1: Important para
Page 64 and 65: Chapter 4 possible to event logging
Page 66 and 67: Chapter 4 KAS’s dependency with L
Page 68 and 69: Chapter 5 5.1 Timer Latency When a
Page 70 and 71: Chapter 5 mode [31]. In opposite, p
Page 72 and 73: Chapter 5 Figure 5.4 shows the inte
Page 74 and 75: Chapter 5 latency. Figure 5.5 shows
Page 76 and 77: Chapter 5 Figure 5.6 Interface of s
Page 78 and 79: Chapter 5 Table 5.1: Result of Dete
Page 80 and 81: Chapter 5 Table 5.2: Result of Anal
Page 82 and 83: Chapter 5 most of time. Especially,
Page 84 and 85: Chapter 5 Figure 5.13: Result of an
Page 86 and 87: Chapter 5 Figure 5.16: Result of ex
Page 90 and 91: Chapter 6 In embedded systems, ther
Page 92 and 93: Chapter 6 Figure 6.1: Real-Time Arc
Page 94 and 95: Appendix A.1 RTOS Commonly, a goal
Page 96 and 97: Appendix software, real-time OS mus
Page 98 and 99: Appendix critical task and non-crit
Page 100 and 101: Appendix � Portability CABI shoul
Page 102 and 103: Bibliography [1] L. Abeni, A. Goel,
Page 104 and 105: Bibliography [21] C. Yuan, N. Lao,
Page 106 and 107: Bibliography [38] Magdalena Balazin
Page 108 and 109: Bibliography [56] Balakrishnan, S.;
Page 110 and 111: Acknowledgements I would firstly li
Page 112 and 113: Publication List 種類別題名
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