config ZRAM tristate "Compressed RAM block device support" depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO select CRYPTO_LZO default n help Creates virtual block devices called /dev/zramX (X = 0, 1, ...). Pages written to these disks are compressed and stored in memory itself. These disks allow very fast I/O and compression provides good amounts of memory savings. It has several use cases, for example: /tmp storage, use as swap disks and maybe many more. See zram.txt for more information.