Unix System Kernel
Unix: Introduction
Operating System: a system that manages the resources
of a computer.
Resources: CPUs, Memory, I/O devices, Network
Kernel: the memory resident portion of Unix system
File system and process control system are two major
components of Unix Kernel.
Architecture of Unix System
OS interacts directly with
the hardware
Such OS is called
system kernel
Unix System Kernel
Three major tasks of kernel:
Process Management
Device Management
File ....etc

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The limited built-in configurability of Linux can lead to expensive code size overhead when it is used in the embedded systems application. This problems can be overcome by the use of the link-time compaction that exploit the previously well known fixed runtime environment of many embedded systems. The ARM XScale and i386 platforms are used as the test platforms and with the proposed method, upto 16% reduction in the kernel memory footprint can be achieved. The proposed techniques can be implemented easily with simple additions to existing bina ....etc

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INSIDE THE LINUX KERNEL



WHAT IS A KERNEL? (1/2)

it s a program that runs in Kernel Mode

CPUs run either in Kernel Mode or in User Mode

when in User Mode, some parts of RAM can t be addressed, some instructions can t be executed, and I/O ports can t be accessed

when in Kernel Mode, no restriction is put on the program

IS AN INSTRUCTION REALLY FAULTY?

faulty instructions may occur for two distinct reasons:
programming error

deferred allocation ....etc

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Unix Kernel Architecture

Unix Kernel Architecture
The kernel runs the show, i.e. it manages all the operations in a Unix flavored
environment. The kernel architecture must support the primary Unix requirements. These
requirements fall in two categories namely, functions for process management and
functions for file management (files include device files). Process management entails
allocation of resources including CPU, memory, and offers services that processes may
need. The file management in itself involves ....etc

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Ktrace: A Framework for Tracing the Linux Kernel

Many tools exist to analyze the Linux Operating System but very few of them can be used to analyze the Linux kernel. The existing tools are not fully capable of providing a picture of the kernel level activity of the system to a user - some tools are inclined towards a particular aspect of the kernel while others provide a more generic information without going into details.

We propose and implement a centralized tracing framework for the Linux kernel. The framework is based on the s ....etc

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ABSTRACT


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