Practice Operating Systems interview questions covering process management, scheduling, memory management, file systems, synchronization, deadlocks, and virtual memory.
Operating systems interviews assess whether you can reason about resource management, concurrency, and hardware abstraction at a level that underpins all other software. They appear frequently at systems programming, kernel development, cloud infrastructure, and backend performance roles — but even general software engineering interviews at FAANG regularly include OS questions.
Start with process and thread management: the difference between processes and threads (address space, resources, context switching cost), the process lifecycle, and scheduling algorithms (FCFS, SJF, Round Robin, Priority, MLFQ). Know how context switching works at the hardware level and why the scheduler must save and restore CPU registers. Memory management is the deepest topic: paging (page tables, multi-level page tables, TLB functioning), segmentation, virtual memory (demand paging, page fault handling, page replacement algorithms — LRU, FIFO, Optimal, Clock), and thrashing.
Synchronisation covers the critical section problem, Peterson's algorithm, semaphores, monitors, and classic problems (producer-consumer, readers-writers, dining philosophers). Deadlock requires understanding Coffman's four conditions, resource allocation graphs, and the banker's algorithm. Use the Theory Notes to consolidate conceptual understanding, the MCQ Tests for rapid-recall practice, and the Top 50 OS Interview Questions to build complete, structured answers.
