| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | config ZRAM |
| 3 | tristate "Compressed RAM block device support" |
| 4 | depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO |
| 5 | select CRYPTO_LZO |
| 6 | default n |
| 7 | help |
| 8 | Creates virtual block devices called /dev/zramX (X = 0, 1, ...). |
| 9 | Pages written to these disks are compressed and stored in memory |
| 10 | itself. These disks allow very fast I/O and compression provides |
| 11 | good amounts of memory savings. |
| 12 | |
| 13 | It has several use cases, for example: /tmp storage, use as swap |
| 14 | disks and maybe many more. |
| 15 | |
| 16 | See zram.txt for more information. |
| 17 | |
| 18 | config ZRAM_WRITEBACK |
| 19 | bool "Write back incompressible page to backing device" |
| 20 | depends on ZRAM |
| 21 | default n |
| 22 | help |
| 23 | With incompressible page, there is no memory saving to keep it |
| 24 | in memory. Instead, write it out to backing device. |
| 25 | For this feature, admin should set up backing device via |
| 26 | /sys/block/zramX/backing_dev. |
| 27 | |
| 28 | See zram.txt for more infomration. |