Use with extreme caution. Normally, if a file system exists on the device to be enabled, swapon fails and displays an error message. This option cannot be used with the -e option. The default value for limit is 0, indicating there is no limit to the amount of file system space the paging system can use. The default value for min is 0, indicating no paging space is to be allocated initially.
Space is taken from the systems with lower priority numbers first.
Under most circumstances, space is taken from device paging areas before file system paging areas, regardless of priority. This reserved space is in addition to the minimum free space specified by the administrator when the file system was created. The default value for reserve is 0 indicating that no file system space is reserved for file system use only. Normally, swapon will not enable paging on a device if it is being used by savecore to retrieve system dump information. This option forces the device to be enabled, which may overwrite any system dump information contained on the device.