Swapping | Computer Science

Swapping is the process of exchanging pages, segment of memory and values to another location and it also manipulates data files that are larger than the main memory. Copy the link given below and paste it in new browser window to get more information on Swapping:- http://www.transtutors.com/homework-help/computer-science/operating-system/memory-management/swapping/

1. SWAPPING

2. Swapping is the process of exchanging pages, segment of memory and values to another location. It occurs in three types. A process can be swapped temporarily out of memory to a backing store, and then brought back into memory for continued execution, here backing store is the fast disk large enough to accommodate copies of all memory images for all users and must provide direct access to these memory images. The first UNIX system kernels monitored the amount of free memory constantly. When it became less than a fixed threshold, they performed some swapping out. This activity consisted of copying the entire address space of a process to disk. Conversely, when the scheduling algorithm selected a swapped – out process, the whole process was swapped in from disk.

3. Swapping in OS

4. Swapping in Linux

5. Swap space  in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the  swap space . While  swap space  can help machines with a small amount of RAM, it should not be considered a replacement for more RAM. The swap cache is crucial to avoid race conditions among processes trying to access pages that are being swapped. The swap cache collects shared page frames that have been copied to swap areas. It does not exist as a data structure on its own; instead, the pages in the regular page cache are considered to be in swap cache if certain fields are set.

6. Swap area

7. Swap cache

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