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8: Memory Management. 2. What Is In This Chapter? Just as processes share the CPU, they also share physical memory. This chapter is about mechanisms for doing that sharing. OPERATING SYSTEM. Memory Management
Preparing a Program for Execution. ? Program Transformations. ? Logical-to-Physical Address Binding. • Memory Partitioning Schemes. ? Fixed Partitions. ? Variable Partitions. • Allocation Strategies for Variable Partitions. • Dealing with Insufficient Memory. ECS 150 (Operating Systems). Memory Management, 2
Types of Memory: Primary Memory (eg. RAM). Holds data and programs used by a process that is executing. Only type of memory that a CPU deals with. Secondary Memory (eg. hard disk). Non-volatile memory used to store data when a process is not executing. Fig:Types of Memory management. Memory Management
Memory Management. Requirements. ? Memory management is intended to satisfy the following requirements: ? Relocation. ? Protection. ? Sharing. ? Logical organization. ? Physical organization
Chapter 8: Memory Management. • Background. • Logical/Virtual Address Space vs Physical. Address Space. • Swapping. • Contiguous Memory Allocation. • Segmentation
Memory management is the functionality of an operating system which handles or manages primary memory and moves processes back and forth between main memory and disk during execution. Memory management keeps track of each and every memory location either it is allocated to some process or it is free.
12 Jun 2001 Linux memory management. – This part of the Linux kernel is relatively complex and is only presented in overview, the point is to familiarize yourself with the names and terminology. – Paging. – Physical and logical memory layout. – Contiguous frame management. – Noncontiguous frame management.
Operating Systems/Memory management. Lecture Notes. PCP Bhatt/IISc, Bangalore. M4/V1/June 04/2 fragmented. It is, therefore, essential to attempt compaction. Compaction means. OS re-allocates the existing programs in contiguous regions and creates a large enough free area for allocation to a new process.
The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again. Chapter 8: Memory Management
CSE 120 – Lecture 10. 2. Memory Management. Next few lectures are going to cover memory management. 0. Goals of memory management. ?. To provide a convenient abstraction for programming. ?. To allocate scarce memory resources among competing processes to maximize performance with minimal overhead. 0.
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