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Micro Kernels Have Made No Impact On Modern Operating

Statistics

Counts

Total Pages: 5.42
Total Words: 1356
Total Characters: 7290
Number of Sentences: 124

Averages

Words per Sentences: 10.94
Characters per Words: 5.38

Readability

Flesch Reading Ease: 56.92
Fog Scale Level: 11.37
Flesch-Kincaid Grade Level: 8.04

Micro kernels have made no impact on modern Operating

Abstract

There have been many approaches to the operating systems design. In particular, monolithic kernel and micro kernels are the two approaches, which play a vital role in the operating systems design. This essay is about the impact of micro kernels on modern operating system, i.e. though micro kernels have some performance degradations but still they have highly influenced the design of modern operating systems.

1.                  Introduction

The history of operating system has evolved through several kinds of structures. Monolithic and micro kernels are the two main structures on which operating system has been designed. Systems based on monolithic architecture started out as simple, small structures and gradually added functionality without adding much structure, e.g. DOS, UNIX. On the other hand, in micro kernel architecture, services have been moduled and a small-simple kernel has been developed where kernel is shrinked to run a large number of servers as user-level processes, e.g. Mach, Chorus, L4. Apart from these two architectures, a new model called exokernel has been designed in which the kernel is only a secure hardware multiplexer. This essay includes discussion on above-mentioned architectures with respect to their impact on modern operating systems design.

2.                  Different type of Operating System kernels design

2.1        Monolithic Kernels

Most of the early operating systems were based on monolithic kernels [2], e.g. UNIX OS. In this type of design, the major functionalities of OS, viz. networking, memory management, paging, etc are implemented in the kernel and are executed from the kernel mode only [1]. Usually monolithic kernels are not modular, so it is hard to implement a new functionality or modify the existing ones. This design has several limitations:

·        Since every function in the kernel has all the privileges, a bug in o...

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