TAILIEUCHUNG - Lecture Operating system concepts - Lecture 14

Lecture 15 - Memory management page replacement algorithms design issues. The contents of this chapter include all of the following: Background, topology, network types, communication, communication protocol, robustness, design strategies. | CSC 322 Operating Systems Concepts Lecture - 15: by Ahmed Mumtaz Mustehsan Special Thanks To: Tanenbaum, Modern Operating Systems 3 e, (c) 2008 Prentice-Hall, Inc. (Chapter-3) Ahmed Mumtaz Mustehsan, CIIT, Islamabad 1 Chapter 3 Memory Management Page Replacement Algorithms Design Issues lECTURE-15 Ahmed Mumtaz Mustehsan, CIIT, Islamabad 2 Hardware implementation realizable if affordable. (Not Frequently Used NFU); Software solution. Implementation: Make use of software counters Initially zero, on each clock interrupt OS scans all pages in memory and add R bit (0 or 1) to counter Page fault; Lowest counter page is evicted. Problem; Never forgets anything, . counting of compiler’s pass one is also valid for pass two Solution: (called Aging) The counters are SHR 1 bit, before R bit is added. R bit is added leftmost instead rightmost bit. LRU-software called Not Frequently Used (NFU) lECTURE-15 Ahmed Mumtaz Mustehsan, CIIT, Islamabad 3 LRU in Software called NFU lECTURE-15 Ahmed .

• Hệ điều hành
• Operating system
• Operating system concept
• Memory management
• File systems
• Operating systems design
• Operating system structure
• Operating system concepts
• Lecture Operating system concepts
• Operating system services
• Operating system structures
• Operating system design
• Hệ điều hành
• Computer system organization
• Operating System Debugging
• Operating System Generation
• Types of System Calls
• Lecture Operating system principles
• Computer system
• Modern operating systems
• Evolution of operating systems
• Computer system structures
• File system interface
• File system implementation
• Computer system architecture
• The Linux system