INSIDE THE LINUX KERNEL: HOW YOUR OS ACTUALLY WORKS

The Linux kernel is one of the largest and most important open-source projects in history. It runs on everything from tiny embedded devices to the world's fastest supercomputers, powers Android, and underpins virtually all cloud infrastructure. Core subsystems to understand: 1. Process Management: How the kernel creates, schedules, and manages processes. The Completely Fair Scheduler (CFS) ensures fair CPU time distribution. 2. Memory Management: Virtual memory, page tables, and the OOM killer. Understanding how the kernel manages memory is crucial for writing efficient software. 3. File Systems: The Virtual Filesystem (VFS) layer provides a uniform interface to diverse filesystems. ext4, btrfs, and XFS each optimize for different workloads. 4. Networking Stack: From network interface drivers through the TCP/IP stack to socket APIs — every network request flows through kernel code. 5. Device Drivers: The largest category of kernel code. Drivers bridge users and hardware. For students: start by reading kernel source code (it's surprisingly readable), building and booting custom kernels, and writing simple kernel modules.