os

Why do we need virtual memory?

Understanding virtual memory from first principles

May 24 • Abhinav Upadhyay

17:34

Virtual Memory: A Deep Dive into Page Tables, TLBs, and Linux Internals

From page faults to NUMA topology: how the Linux kernel manages memory, and what that means for the performance of data-intensive systems.

May 10 • Abhinav Upadhyay

What Makes System Calls Expensive: A Linux Internals Deep Dive

An explanation of how Linux handles system calls on x86-64 and why they show up as expensive operations in performance profiles

Sep 16, 2025 • Abhinav Upadhyay

My Top 15 OS Books: From Theory and Implementation to Systems Programming

A personal guide to the most useful books for understanding operating systems

Feb 18, 2025 • Abhinav Upadhyay

Linux Context Switches: The Truth About TLB Flushes

Watch now (22 mins) | Is the TLB really flushed during context switches?

Jan 17, 2025 • Abhinav Upadhyay

21:34

Linux Context Switching Internals: Part 1 - Process State and Memory

How does the Linux kernel represent processes and their state: A breakdown of task_struct and mm_struct

Dec 29, 2024 • Abhinav Upadhyay

Context Switching and Performance: What Every Developer Should Know

Understand how context switching affects CPU registers, caches, TLB, and pipeline performance, and learn strategies to mitigate performance penalties

Dec 12, 2024 • Abhinav Upadhyay

Disillusioning the Magic of the fork System Call

How the kernels implement the fork system call

Nov 26, 2024 • Abhinav Upadhyay

#nojs-banner { position: fixed; bottom: 0; left: 0; padding: 16px 16px 16px 32px; width: 100%; box-sizing: border-box; background: red; color: white; font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"; font-size: 13px; line-height: 13px; } #nojs-banner a { color: inherit; text-decoration: underline; } This site requires JavaScript to run correctly. Please turn on JavaScript or unblock scripts