os

Page Tables from First Principles

Watch now | Constructing page tables from first principle as a way to store virtual-to-physical address mappings

Jun 16 • Abhinav Upadhyay

49:43

Understanding a Process’s Address Space Layout

In this video, we look at how a process’s virtual address space is laid out: code, data, heap, stack, shared libraries, mmap regions, and more.

Jun 6 • Abhinav Upadhyay

22:12

How Large Is the Virtual Address Space?

Watch now | How large is a process’s virtual address space, why is it split between user space and the kernel, and what are canonical virtual addresses?

May 31 • Abhinav Upadhyay

25:15

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

How Linux Implements the fork System Call

How the kernels implement the fork system call

Nov 26, 2024 • Abhinav Upadhyay

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