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Lecture Notes for CMSC 321 - OPERATING SYSTEMS with Barnett at Richmond (UR)

Notes Information

Material Type:Class Note
Professor:Barnett
Class:CMSC 321 - OPERATING SYSTEMS
Subject:Computer Science
University:University of Richmond
Term:Spring 2009
Keywords:
  • Internal Fragmentation
  • Logical View
  • External Fragmentation
  • Segmentation
  • Traditional
  • Relationship
  • Associative Memory
  • Fragmentation
  • Architecture
  • Code Segment
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Sample Document Text

CMSC 321: Operating Systems Lecture 12 Paging and Segmentation Paging .Page: titi t ll l fi d - process : partition in o sma , equal fixe -size chunks .Frame: -RAM: partition into page-sized chunks . Page size == Frame size . Fragmentation: -no external - internal only in last page of a process . Process RAM Page 0 Page 1 Frame 11 Frame 12 . Page 7 Frame 25 . Address Translation in Paging System Data Structures Needed . Page table -one per process -associate page w/ frame -pointer to table in PCB . Frame table -track free/occupied frames Page Size . Factors to consider: - 1. internal fragmentation small pages : less IF small pages : more pages/process - larger page tables - 2. secondary memory large pages : more efficient xfers - 3. effect on page fault rate kas page size increases, principle of locality wea ens fewer pages available in memory - 4. program complexity OOP, threads reduce locality Advantages of Paging . Don't need contiguous space in RAM . Re...

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