Skip to content

Virtual Memory Abstraction

Virtual memory provides each process the illusion of a large, contiguous, private address space by mapping virtual addresses to physical memory through translation tables. This abstraction enables isolation, relocation, and memory overcommitment.

Tension Addressed

Isolation vs. Efficiency

Recognizable As

Process isolation, memory-mapped files, copy-on-write, page faults, swap space, address space layout, 32-bit vs 64-bit address limits.

Canonical Sources

Denning, "Virtual Memory" (1970); Silberschatz, Operating System Concepts

Transfers To

Operating system design, containerization, database buffer management, language runtime memory models

Virtual memory is the foundational abstraction enabling multiprogramming. Without it, programs would need to coordinate physical addresses. The abstraction leaks when pages must be fetched from disk (page faults), revealing the underlying trade-offs.