In a swapping/relocation system, the values assigned to the register pair prevent one user process from writing into the address space of another user process. However, these assignment operations are themselves privileged instructions that can only be executed in kernel mode. Is it conceivable that some operating-system processes might have the entire main memory as their address space? If this is possible, is it necessarily a bad thing? Explain.

In a swapping/relocation system, the values assigned to the register pair prevent one user process from writing into the address space of another user process. However, these assignment operations are themselves privileged instructions that can only be executed in kernel mode. Is it conceivable that some operating-system processes might have the entire main memory as their address space? If this is possible, is it necessarily a bad thing? Explain.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Stack operations

A stack is a linear data structure that follows certain order to perform the operation; the order will be LIFO (Last In First Out) data structure. In the stack data structure elements/items are removed and added only from the top. The topmost stack item/element is pointed by the top pointer and the element which is added to the stack first will get deleted at the last.

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In a swapping/relocation system, the values assigned to the <base, limit> register
pair prevent one user process from writing into the address space of another user
process. However, these assignment operations are themselves privileged
instructions that can only be executed in kernel mode.
Is it conceivable that some operating-system processes might have the entire
main memory as their address space? If this is possible, is it necessarily a bad
thing? Explain.

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