Memory Management: Segmentation Overview
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Questions and Answers

What is the primary purpose of the segment descriptor tables?

  • To ensure that segments always have the same size
  • To keep track of the total number of segments
  • To directly manage the execution of subroutines
  • To map segment numbers to physical addresses (correct)

    • What information does a logical address in a segmented program contain?

  • The physical memory location
  • Only the segment number
  • A unique identifier for each program
  • The segment id and word id pair (correct)

    • What role does the memory management unit play in a segmented memory system?

  • It combines segments into a single unit of memory
  • It maps logical addresses to physical addresses (correct)
  • It allocates memory based on segment size
  • It determines the execution order of segments

    • How does segmentation contribute to memory organization?

    <p>By allowing structured program organization with access rights</p> Signup and view all the answers

    What initiates the fetching of segments to main memory during program execution?

    <p>Requests from currently executed programs</p> Signup and view all the answers

    Study Notes

    Segmentation in Memory Management

    • Segmentation is the mechanism used to divide a program into logical units called segments.
    • Segments can include subroutines, arrays of data, symbol tables, or user programs.
    • A logical address consists of a segment number and an offset within that segment.
    • Segment tables are used to map segment numbers to physical addresses, similar to page tables in paging.
    • Segment sizes can vary, requiring bounds checks to ensure offsets are within the segment boundaries.
    • Each program's segment table is pointed to by a dedicated hardware register called the segment table address register.
    • Segments reside in a shared virtual address space, identified by their names and lengths.
    • Segments can be stored in main memory or auxiliary storage (typically disk memory).
    • The operating system's memory control mechanism automatically fetches segments from auxiliary storage to main memory as needed by running programs.
    • Segmentation aims to increase the address space available for user programs while providing a structured program organization and access control.
    • It enables protection mechanisms to restrict access to segments and enforce security within a multi-user environment.

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    Description

    This quiz covers the concept of segmentation in memory management, including the definition of segments, their structure, and how they interact with physical memory. It examines the use of segment tables and the importance of bounds checks for program efficiency and safety.

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