- Dynamic Managing the swap file creation & deletion - Swapd

Swap or virtual memory is a technique used to write some memory content, not used at the moment, to the hard disk to make room for a process which needs more memory now. swap is said to be 1000 times slower than having "real", physical memory.

By using swap space, programs can be started even when the memory is used to its maximum without having to shut down processes first. This also make a good buffer for when peaks of memory usage occur. Linux can add swap space in two ways, either as a swap file within the file system or as a separate partition.

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source:http://linuxpoison.blogspot.com/2011/01/13578167755134.html