Operating Systems - David Vernon

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Memory Management Virtual Memory – If it isn’t: » the page table is accessed in the normal way and the page frame is retrieved » one of the associative memory entries is deleted » and the page table entry of the page just accessed in inserted instead » Thus, if the same page is accessed again, the associative memory will now ‘hit’ Copyright © 2007 David Vernon (www.vernon.eu)
Memory Management Virtual Memory – Page Replacement Algorithms » If a page fault occurs, the OS has to choose a page to remove from memory (i.e. from the from a page frame) to make room for the the page to be brought in. » If the page to be removed has been modified, it has to be written to disk (otherwise it doesn’t) Copyright © 2007 David Vernon (www.vernon.eu)
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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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Processes void consumer(void) { int
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Processes void writer(void) { while
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Processes Process Scheduling - Crit
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Operating Systems - David Vernon

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