Virtual Memory Concepts
Understand the principles of virtual memory, memory segmentation, and paging from a low-level perspective.
Virtual Memory's Role
Welcome to the world of Virtual Memory! This concept is fundamental to how modern operating systems manage memory, enabling powerful features like multitasking and memory protection.
It allows programs to use a continuous, private memory space, even if the physical RAM is fragmented or smaller than the program's needs.
Limits of Physical Memory
In early computing, programs directly accessed physical RAM. This led to several challenges:
- Limited RAM: Programs had to fit entirely into physical memory.
- No Isolation: One program could overwrite another's memory, causing crashes.
- Relocation Issues: Programs needed to be loaded at specific physical addresses, complicating multitasking.
Virtual Memory was designed to solve these problems by introducing an abstraction layer.