In order to thoroughly understand what makes Linux tick and why it
works so well on a wide variety of systems, you need to delve deep
into the heart of the kernel. The kernel handles all interactions
between the CPU and the external world, and determines which
programs will share processor time, in what order. It manages
limited memory so well that hundreds of processes can share the
system efficiently, and expertly organizes data transfers so that
the CPU isn't kept waiting any longer than necessary for the
relatively slow disks.
The third edition of "Understanding the Linux Kernel" takes you
on a guided tour of the most significant data structures,
algorithms, and programming tricks used in the kernel. Probing
beyond superficial features, the authors offer valuable insights to
people who want to know how things really work inside their
machine. Important Intel-specific features are discussed. Relevant
segments of code are dissected line by line. But the book covers
more than just the functioning of the code; it explains the
theoretical underpinnings of why Linux does things the way it
does.
This edition of the book covers Version 2.6, which has seen
significant changes to nearly every kernel subsystem, particularly
in the areas of memory management and block devices. The book
focuses on the following topics:
Memory management, including file buffering, process swapping,
and Direct memory Access (DMA)
The Virtual Filesystem layer and the Second and Third Extended
Filesystems
Process creation and scheduling
Signals, interrupts, and the essential interfaces to device
drivers
Timing
Synchronization within the kernel
Interprocess Communication (IPC)
Program execution
"Understanding the Linux Kernel" will acquaint you with all the
inner workings of Linux, but it's more than just an academic
exercise. You'll learn what conditions bring out Linux's best
performance, and you'll see how it meets the challenge of providing
good system response during process scheduling, file access, and
memory management in a wide variety of environments. This book will
help you make the most of your Linux system.
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