Chapter 4 - DSpace at Waseda University

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to propose a solution for the problem which occurs during project development. Moreover the structure of embedded systems is becoming more complex swiftly. Therefore, in order to analyze and solve problems in systems, a framework which makes performance measurement and analysis is urgently needed. In this paper, we propose a system architecture called Kernel Analysis System (KAS) which analyzes the event log of embedded kernel. KAS figures out problems in kernel quickly and has three main layers. First, is the Detection Layer. In this layer, the KAS finds out problems by checking all events that occurred in the kernel and counting there number. Second, is the Separation Layer. In this layer, the KAS separates only the events related to problems from all executed events. Third, is the Analysis Layer. In this layer, the KAS analyzes the problems by calculating all the events’ running time and the number of error occurrences so as to figure out the cause of the problems. KAS cannot fix up every problem. Currently, KAS tested problem analysis of HRTimer, but 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 area in kernel, that it is possible for developer or administrator to analyze timer problems quickly and efficiently. iv
Contents Abstract ……………………………………………………………………..…. v 1. Introduction 1.1 Motivation ……………………………………………………………………............ 3 1.2 Challenge ……………………………………………………………………………. 4 1.3 Contribution …………………………………………………………………………. 6 1.4 Outline ………………………………………………………………………………. 7 2. Background 2.1 Embedded System ………………………………………………………………….… 8 2.2 Linux Kernel …………………………………………………………………………. 9 2.3 Embedded Linux ……………………………………………………………………. 12 2.4 System Monitoring …………………………………………………………………. 14 v
Page 1: Analyzing Real-Time Performance Pro
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 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
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Page 50 and 51: Chapter 4 Advantage of analysis by
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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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