Page Faults - Understanding Memory Management in Operating Systems

Explore the fundamental concepts of page faults in operating systems through this 47-minute backend engineering video that examines when processes attempt to access memory not backed by physical pages, triggering kernel faults that load pages. Discover how page faults occur during first access, stack expansion, copy-on-write operations, swap scenarios, and other critical memory management situations while understanding their associated costs. Learn about virtual memory as an abstraction of physical memory that enables memory sharing, allows more processes to run by moving unused data to disk, and supports NUMA architecture for optimal CPU-memory placement. Examine Virtual Memory Areas (VMA) including text/code, data, BSS, heap, and stack segments, then delve into kernel mode operations before analyzing different types of page faults: first access, stack expansion, copy-on-write (CoW), swap, file-backed, and permission page faults. Gain comprehensive insights into the necessity and performance implications of page faults in kernel operations, essential knowledge for backend engineers working with memory management and system optimization.