1config ZRAM 2 tristate "Compressed RAM block device support" 3 depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO 4 select CRYPTO_LZO 5 default n 6 help 7 Creates virtual block devices called /dev/zramX (X = 0, 1, ...). 8 Pages written to these disks are compressed and stored in memory 9 itself. These disks allow very fast I/O and compression provides 10 good amounts of memory savings. 11 12 It has several use cases, for example: /tmp storage, use as swap 13 disks and maybe many more. 14 15 See zram.txt for more information. 16 17config ZRAM_WRITEBACK 18 bool "Write back incompressible page to backing device" 19 depends on ZRAM 20 default n 21 help 22 With incompressible page, there is no memory saving to keep it 23 in memory. Instead, write it out to backing device. 24 For this feature, admin should set up backing device via 25 /sys/block/zramX/backing_dev. 26 27 See zram.txt for more infomration. 28