11. Lecture – 28: Paging and Segmentation
The chapter discusses the mechanisms of virtual memory management, specifically focusing on paging and segmentation. It explains how virtual addresses are converted to physical addresses through page tables, detailing the structure and size of these tables in modern computing systems. Additionally, it explores the use of page table length registers and the dual-segment model to efficiently manage virtual memory for processes that grow dynamically over time.
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Sections
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What we have learnt
- Virtual addresses consist of a page number and an offset, which aids in mapping to physical memory.
- Each process has a separate page table that may contain a physical page frame number or a disk address if the page is not in memory.
- Page tables can be large, consuming significant memory, thus necessitating techniques like length registers for management.
Key Concepts
- -- Virtual Memory
- A memory management technique that gives an application the illusion of a large, contiguous memory space.
- -- Page Table
- A data structure that maps virtual addresses to physical addresses, indicating where each virtual page is stored.
- -- Page Table Length Register (PTLR)
- A register that indicates the size of the page table being used by a process.
- -- Segmented Paging
- A memory management technique that combines segmentation and paging to efficiently handle memory allocation for processes.
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