Answered: Define page table.

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

Define page table.

Expert Solution

Step 1

Page table size:-

Page size is really the size within each virtual page i.e. 4 KB for a 32-bit system while the memory address entry is really the space that holds the connection between the physical and virtual address of a page, it is typically 4 Bytes for a 32-bit system.

Step 2

Page table:-

The page table is the data structure in a desktop operating system used for virtual memory to keep the connection between virtual addresses and physical addresses. The program performed by the acquiring method uses virtual addresses, whereas the hardware uses physical addresses, or even more precisely, the RAM subsystem.
The page table is indeed a key component of the conversion of virtual addresses required to access memory.
The page table has page table entries in which a frame amount and optional status bits are stored for each page table entry. Several of the activity bits that the virtual memory device uses. In PTE, the frame amount is by far the most important thing.

Page table types:-

Several types of page tables are available which are tailored for different needs.

Inverted Page Tables:- It is better to think of an inverted page table (IPT) with an off-chip TLB expansion that uses regular device RAM. Unlike a true table entry, all existing mappings are not actually holdable. Just as it does with a MIPS-style technology-filled TLB, the operating system should be prepared to handle misses.
Multilevel Page Tables:- A inverted page table preserves a list of mappings built-in physical memory for all frames. That could be pretty wasteful though. We may create a routing table structure that includes modifier keys for virtual pages instead of doing so. It is achieved by maintaining multiple page tables that occupy a certain memory space block. For example:- We can create smaller 4 K pages with 1024 inputs that cover 4 M of virtual memory.
Virtualized Page Tables:- It was suggested that designing a page fact table that included mappings in the virtual address space per each virtual page could end up being wasteful. But, by placing the page table into virtual memory, and having the virtual memory system handle the memory for both the page table, we could get around the unnecessary space issues.
Nested Page Tables:- Nested page tables can be added to increase the efficacy of hardware virtualization. Through having hardware compatibility for page-table virtualization, a need for a simulator is greatly reduced.