Chapter 8: Memory Management

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Logical vs. Physical Address Space!The concept of a logical address space that is bound to a separatephysical address space is central to proper memory management" Logical address – generated by the CPU; also referred to asvirtual address" Physical address – address seen by the memory unit"Logical and physical addresses are the same in compile-time andload-time address-binding schemes; logical (virtual) and physicaladdresses differ in execution-time address-binding scheme"Operating System Concepts!8.6! Silberschatz, Galvin and Gagne ©2005!
<strong>Memory</strong>-<strong>Management</strong> Unit (MMU)!Hardware device that maps virtual to physical address"In MMU scheme, the value in the relocation register is added toevery address generated by a user process at the time it is sent tomemory"The user program deals with logical addresses; it never sees thereal physical addresses"Operating System Concepts!8.7! Silberschatz, Galvin and Gagne ©2005!
Page 1 and 2: The image cannot be displayed. Your
Page 5: Multistep Processing of a User Prog
Page 9 and 10: Swapping!A process can be swapped t
Page 11 and 12: Demand Paging!Bring a page into mem
Page 13 and 14: Valid-Invalid Bit!With each page ta
Page 15 and 16: Steps in Handling a Page Fault!Oper
Page 17 and 18: Important Dates!"" Apr 16 Prog Assi
Page 19 and 20: Contiguous Allocation!Main memory u
Page 21 and 22: HW address protection with base and
Page 23 and 24: Dynamic Storage-Allocation Problem!
Page 25 and 26: Fragmentation!External Fragmentatio
Page 27 and 28: Address Translation Scheme!Address
Page 29 and 30: Paging Example !Operating System Co
Page 31 and 32: Free Frames!Before allocation"After
Page 33 and 34: Associative Memory! Associative mem
Page 35 and 36: Effective Access Time!Associative L
Page 37 and 38: Valid (v) or Invalid (i) Bit In A P
Page 39 and 40: Virtual Memory! Elusion to expand m
Page 41 and 42: Transfer of a Paged Memory to Conti
Page 43 and 44: Page Table When Some Pages Are Not
Page 45 and 46: What happens if there is no free fr
Page 47 and 48: Hierarchical Page Tables!Break up t
Page 49 and 50: Two-Level Page-Table Scheme!Operati
Page 51 and 52: Stop Here 4/23!Operating System Con
Page 53 and 54: Hashed Page Table!Operating System
Page 55 and 56: Inverted Page Table Architecture!Op
Page 57 and 58:
Shared Pages Example!Operating Syst
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User’s View of a Program!Operatin
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Stop here!Operating System Concepts
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Segmentation Architecture (Cont.)!R
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Address Translation Architecture !O
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Sharing of Segments!Operating Syste
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MULTICS Address Translation Scheme!
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Linux on Intel 80x86!Uses minimal s
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Chapter 8: Memory Management

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