It explains low-level hardware interactions—such as paging, interrupts, and segmentation—better than most modern high-level books.
While the book provides an excellent theoretical foundation, potential readers should note: Understanding the Linux Kernel, Third Edition - Amazon.com Understanding the Linux Kernel, Third Edition
A comprehensive 942-page manual that dissections code line-by-line while explaining the theoretical "why" behind kernel design. Publication Date: Originally released in November 2005. Why It Matters Understanding the Linux Kernel, Third Edition