Chapter 4 - DSpace at Waseda University

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2.5 Event Log …………………………………………………………………………… 15 2.6 Problem Analysis …………………………………………………...………………. 17 2.7 Linux Timer ………………………………………………………………...……… 18 3. Related Work 3.1 Event log ………………………………………………………………………….... 23 3.1.1 Event Logging ……………………………………………………………….. 23 3.1.1 Event Log Monitoring ……………………………………………………… 25 3.2 System Monitoring …………………………………………………………………. 26 3.3 Performance Analysis Tools ………………………………………………...…… 29 3.4 Linux Trace Toolkit next generation ………………………………………..….. 31 4. System Framework 4.1 Introduction …………………………………………………………………….........35 4.2 Kernel Analysis System …………………………………………..………..…..... 36 4.2.1 Detection Layer ……………………………………………………….……. 40 4.2.1.1 When developing Embedded System ………………………………... 43 4.2.1.2 Used by users ……………………………………………………..….. 43 4.2.1.3 Process Flow of DL ……………………………………………..…… 44 4.2.2 Separation Layer …………………………………………………………….. 46 4.2.3 Analysis Layer ……………………………………………………………... 47 vi
4.3 Kernel Analysis System Algorithm …………………………………….................... 48 4.3.1 Important function and parameter ………………………………………….… 50 4.4 Trace Point and Event Log ……………………………………................................ 52 4.5 LTTng and KAS ………………………………………………………………….… 53 4.6 Summary ………………………………………………………………….………... 55 5. Case Study 5.1 Timer Latency …………………………………………………………………........ 57 5.2 Preemptive vs. Non-preemptive ……………………………………………............ 59 5.2.1 Preemptive Kernel …………………………………………………………... 59 5.2.2 Non-preemptive Kernel ………………………………………………….….. 61 5.3 High Resolution Timer ………………………………………………………….…. 62 5.4 Latency Policy ………………………………………………………………….….. 64 5.5 Evaluation …………………………………………………………………….……. 65 5.5.1 Result of KAS ………………………………………………………………... 67 5.5.1.1 Result of DL …………………………………………………………... 68 5.5.1.2 Result of SL ………………………………………………………..….. 69 5.5.1.3 Result of AL ……………………………………………………….….. 70 5.5.2 Analysis of HRTimer Latency ………………………………………………... 72 5.6 Summary ………………………………………………………………………….... 78 vii
Page 1: Analyzing Real-Time Performance Pro
Page 4 and 5: to propose a solution for the probl
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 18 and 19: Chapter 1 1.3 Contribution When dev
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
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
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Chapter 4 4.2.2 Separation Layer Fi
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Chapter 4 4.2.3 Analysis Layer Figu
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Chapter 4 and a developer analyzes
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Chapter 4 Table 4.1: Important para
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Chapter 4 possible to event logging
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Chapter 4 KAS’s dependency with L
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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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