Chapter 4 - DSpace at Waseda University

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Chapter 2 memory and to manage system devices and memory, processes, I/O devices. Every system has the kernel and it affects whole performance [4] of the system by its kernel performance. Therefore kernel is important such as the embedded system industries. The most important feature of the Linux kernel is that users can modify the kernel by themselves. The Linux kernel also distributes type of sources and it can download through distributed package and ftp or BBS user group such as other Linux programs. The environments for compile easily set up by using few well-made scripts and easily find documents in the internet. The policy of open sources is one of the reasons and the Linux kernel and user groups were achieved quantum leap. Linux’s open mind can make rapid and strong kernel even if other OSes are fettered by commercialism. The following points are Linux kernel’s strengths [24]. � No royalty: Linux can be downloaded from the Internet without a continental free. It is to decrease development costs. � Open source: it is possible to expand OS. � As Linux system is stable, the possibility of error is low. � Linux can be used in a variety of types of hardware � Safe: Security model used Linux based on ideas used UNIX security, famous for its toughness and proven quality. � An immediate modification is possible when the kernel bugs occurred. 10
Here are Linux kernel’s weaknesses. � Limited develop environment. � A large number of different Linux distributions. � Is open source products can be trusted? 11 Chapter 2 The Linux kernel is composed of two major modes as the user mode and the kernel mode. Figure 2.1 shows running the Linux kernel mode. The first is the user-space that applications are running. And a second is the kernel-space that kernel modules and device drivers are running. The signals such as system calls, ioctl() exchange between the user-space and the kernel-space. And also the signals such as H/W interfaces or protocols exchange between hardware and kernel-space. Figure 2.1: User-space vs. kernel-space
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
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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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