Virtual memory mangment,a complete explination | operating system tutorials #digitalsoftecs #os

Today we are going to learn about Memory management in OS
concepts we are going to cover are:
1) Abstraction in virtual memory
2. Address Translation:
3. Page Tables
4. Paging: Paging is a common virtual memory technique
5. Page Faults

Virtual memory management is a crucial aspect of modern operating systems that enables efficient memo utilization by allowing programs to use more memory than is physically available. Here's a brief overview:

1. Abstraction: Virtual memory provides an abstraction layer between the physical memory (RAM) and the memory space seen by processes. It allows each process to have its own virtual address space, independent of the actual physical memory layout.

2. Address Translation: Virtual memory uses address translation mechanisms to map virtual addresses used by processes to physical addresses in RAM. This mapping is typically managed by the operating system's memory management unit (MMU).

3. Page Tables: Page tables are data structures used by the MMU to store the mappings between virtual and physical addresses. When a program accesses a virtual address, the MMU consults the page tables to determine the corresponding physical address.

4. Paging: Paging is a common virtual memory technique where memory is divided into fixed-size blocks called pages. Pages are stored in a combination of RAM and secondary storage (usually a hard drive or SSD). The operating system swaps pages between RAM and secondary storage as needed, allowing processes to access more memory than is physically available.

5. Page Faults: When a process attempts to access a page that is not currently in RAM, a page fault occurs. The operating system handles page faults by loading the required page from secondary storage into RAM, updating the page tables, and restarting the interrupted process.

6. Demand Paging: Demand paging is a strategy where only the pages needed by a process are loaded into RAM, rather than loading the entire program into memory at once. This helps conserve memory resources and improves overall system performance.

7. Memory Protection: Virtual memory systems often include mechanisms for memory protection, allowing the operating system to enforce access controls and prevent processes from accessing unauthorized memory regions.

In summary, virtual memory management plays a critical role in modern operating systems by providing a flexible and efficient memory abstraction that enables multitasking, memory protection, and efficient use of system resources