Chapter 4 - DSpace at Waseda University

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Chapter 5 Table 5.2: Result of Analysis Layer Event name Execution times Consumption (ns) kernel_arch_syscall_exit 114 129,687 kernel_arch_syscall_entry 114 269,678 kernel_sched_try_wakeup 8 16,628 kernel_timer_itimer_expired 1 688 kernel_softirq_raise 2 2,976 kernel_softirq_exit 3 2,257 kernel_softirq_entry 3 4,182 kernel_timer_set 4 4,013 kernel_timer_update_time 1 1,955 kernel_send_signal 2 2,939 kernel_irq_exit 3 9,675 kernel_irq_entry 3 15,591 mm_page_free 9 18,643 mm_page_alloc 351 553,913 fs_writev 2 1,616 fs_write 1 1,010 fs_read 4 3,317 fs_ioctl 4 3,126 fs_pollfd 24 19,678 fs_select 66 54,945 kernel_sched_schedule 6 9,645 input_event 7 30,820 net_socket_call 85 53,884 net_socket_sendmsg 85 68,806 net_dev_receive 6 4,761 net_dev_xmit 6 15,093 68
69 Chapter 5 Table 5.2 shows the statistic information on occurred latency such as event names and execution times and consumption time. Execution time shows how many times each event was called in a period and consumption time shows overall time of each event during a period in nanosecond. From Table 5.2, it is possible to analyze event (mm_page_alloc, net_socket_call, and net_socket_sendmsg) has higher number than other events by analyzing execution times and consumption time. Table 5.3: Result of Analysis Layer: (a) Execution times when the time latency did not occur, (b) Execution times when the time latency occurred Event name (a) Execution times (b) Execution times kernel_arch_syscall_entry 37 92 kernel_arch_syscall_exit 37 91 net_socket_recvmsg 0 2 net_socket_sendmsg 0 85 net_dev_xmit 0 85 mm_page_alloc 3 359 mm_page_free 3 20 … … … kernel_softirq_entry 1 6 kernel_softirq_exit 1 6 kernel_timer_itimer_expired 1 1 Table 5.3 also shows the results of the analysis layer. In the table, the case (a) means execution times when the time latency did not occur, and the causes (b) means execution times when the time latency occurred by the network stress and I/O stress program. By comparing the case (a) to the case (b), we can figure out what event cause the time latency. In the result, the events - net_socket_sendmsg, net_dev_xmit, mm_page_alloc - were executed
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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
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
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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
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
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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 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 88 and 89: Chapter 5 5.6 Summary We analyzed l
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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