Operating Systems - David Vernon

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Memory Management Virtual Memory – Multilevel Paging » PT1 indexes top-level page table (1024 entries) » Only entries 0, 1, and 1023 point to the secondlevel page tables » which in turn point to the physical memory for code, data, and stack, respectively » Even though there are over a million pages ( 2 20 ) and a thousand page tables, only 4 are needed. » We can also have 3-level and 4-level paging (but rarely worth doing it for more than 3-level) Copyright © 2007 David Vernon (www.vernon.eu)
Memory Management Virtual Memory – Multilevel Paging » Example: 32-bit virtual addresss 0x00403004 »PT1 is: »PT2 is: » Offset is: » Which entry contains the page frame number of the virtual address? » What happens if the present/absent bit is zero in this page table entry? » What happens if it is set? Copyright © 2007 David Vernon (www.vernon.eu) » Where does the offset come in?
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Operating Systems David Vernon Copy
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Course Content Historical overview
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Course Content Device management -
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Course Content Networking issues -
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Course Textbook “Modern Operating
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Assessment of Performance First exa
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The Need for Operating Systems Why
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The Need for Operating Systems Comp
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The Need for Operating Systems Exam
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Load B DR ← M(AR) A B C 11111111
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Load B Increment PC A B C 11111111
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Load B AR ← DR(address) A B C 111
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Load B AC ← DR A B 11111111 01001
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The Need for Operating Systems Mach
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What is an Operating System There a
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What is an Operating System OS as a
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History of Operating Systems First
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History of Operating Systems Second
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History of Operating Systems Third
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History of Operating Systems Third
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History of Operating Systems Fourth
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Operating System Concepts System ca
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Operating System Concepts Processes
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Operating System Concepts Files - O
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Operating System Concepts Copyright
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Operating System Concepts Files -Pr
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Operating System Concepts Files - O
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Operating System Concepts System Ca
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Operating System Concepts The Shell
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Operating System Structure Monolith
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Operating System Structure Monolith
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Operating System Structure Virtual
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Operating System Structure Virtual
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Operating System Structure Client-S
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Operating System Structure Client-S
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Processes All modern computer syste
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Processes Single program counter Fo
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Processes Because the OS schedules
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Processes Process Hierarchies - pro
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Processes Running 1 Blocked 4 3 2 R
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Processes Device I/O … the differ
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Processes Interrupts and device I/
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Processes InterProcess Communicatio
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Processes Process A Spooler directo
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Processes Process A Process B Print
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Processes /* process 0 */ main () {
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while (turn == process && intereste
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while (turn == process && intereste
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Processes void consumer(void) { int
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Processes #include “prototypes.h
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Operating Systems - David Vernon

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