Memory management in os notes
[PDF File]CSCI 243 The Mechanics of Programming The Operating …
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TVF / RIT 20195 CS243: Memory Management OS Activity Sequence • User runs a program • OS examines the executable • Finds size of each section (text, data, etc.) • OS allocates physical memory for the program • Space for code and data • Initial space for heap and runtime stack • OS sets up address mapping • OS sets up memory contents
[PDF File]OPERATING SYSTEMS Lecture Notes
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Lecture Notes DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING ... CPU, memory, I/O devices Operating system Controls and coordinates use of hardware among various applications and users ... Allocating and deallocating memory space as needed Storage Management OS provides uniform, logical view of information storage ...
[PDF File]Lecture 10: Memory Management
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4 CSE 120 – Lecture 10 Virtual Memory OS provides Virtual Memory (VM) as the abstraction for managing memory Indirection allows moving programs around in memory Allows processes to address more or less memory than physically installed in the machine »Virtual memory enables a program to execute with less than its
[PDF File]Internals Chapter 8 Virtual Memory
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Hardware and Control Structures Two characteristics fundamental to memory management: 1) all memory references are logical addresses that are dynamically translated into physical addresses at run time 2) a process may be broken up into a number of pieces …
[PDF File]Operating Systems – Memory Management
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ECE 344 Operating Systems 9 Contiguous Memory Allocation • Multiple partitions for multiple processes • Relocation register and limit registers to protect processes from one another (and protect OS code) • Both registers are part of process context (i.e., PCB) • Relocation register contains value of smallest physical address
[PDF File]Lecture Notes for CS347: Operating Systems Mythili ...
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Lecture Notes for CS347: Operating Systems Mythili Vutukuru, Department of Computer Science and Engineering, IIT Bombay 7. Memory Management 7.1 Basics of Memory Management What does main memory (RAM) contain? Immediately after boot up, it contains the mem-ory image of the kernel executable, typically in “low memory” or physical memory ...
[PDF File]OPERATING SYSTEMS MEMORY MANAGEMENT - WPI
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8: Memory Management 4 MEMORY MANAGEMENT • The concept of a logical address space that is bound to a separate physical address space is central to proper memory management. • Logical address – generated by the CPU; also referred to as virtual address • Physical address – address seen by the memory unit • Logical and physical addresses are the same in compile-time and load-
[PDF File]Memory Management - MIT OpenCourseWare
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TLB miss causes an exception and the operating system walks the page tables and reloads TLB. A privileged “untranslated” addressing mode used for walk Hardware (SPARC v8, x86, PowerPC) A memory management unit (MMU) walks the page tables and reloads the TLB If a missing (data or PT) page is encountered during the
[PDF File]OPERATING SYSTEMS VIRTUAL MEMORY - WPI
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9: Virtual Memory 4 VIRTUAL MEMORY Demand paging When a page is touched, bring it from secondary to main memory. Overlays Laying of code data on the same logical addresses - this is the reuse of logical memory. Useful when the program is in phases or when logical address space is small.
[PDF File]Memory Management - University of California, Davis
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o Operating system cannot anticipate all of the memory references a program will make • Sharing Allow several processes to access the same portion of memory Better to allow each process access to the same copy of the program rather than have their own separate copy ECS 150 (Operating Systems) Memory Management, 5
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