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+ Operating system needed to check if routine is in processes’ memory address. + Dynamic linking is particularly useful for libraries. Memory Management Performs the above operations.
This chapter will introduce the concept of memory management and discuss its importance in operating systems. Memory management is the process of controlling and coordinating the use of computer memory to allow the efficient execution of programs and the sharing of memory among multiple processes.
small fast expensive memory (e.g. cache), average in size, speed and expense memory (e.g. operating memory), huge, slow and cheap memory (e.g. disk/tape memory). Memory Management (MM) type on the level of operating system is dictated by the computer system architecture.
• Operating system checks if routine is in processes’ memory address, adding it if not • Dynamic loading avoids loading routines until they’re called • Better memory usage as unused routines are never loaded
Survey techniques for implementing virtual memory. ♦ Fixed and variable partitioning. ♦ Paging. ♦ Segmentation. Focus on hardware support and lookup procedure. ♦ Next lecture we’ll go into sharing, protection, efficient implementations, and other VM tricks and features.
Basic Memory Management: logical vs. physical address space, protection, contiguous memory allocation, paging, segmentation, segmentation with paging. Virtual Memory: background, demand paging, performance, page replacement, page replacement algorithms (FCFS, LRU), allocation of frames, thrashing.
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 complete data in physical memory.
