1 # SPDX-License-Identifier: GPL-2.0
3 tristate "Compressed RAM block device support"
4 depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO
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.
12 It has several use cases, for example: /tmp storage, use as swap
13 disks and maybe many more.
15 See Documentation/blockdev/zram.txt for more information.
18 bool "Write back incompressible page to backing device"
21 With incompressible page, there is no memory saving to keep it
22 in memory. Instead, write it out to backing device.
23 For this feature, admin should set up backing device via
24 /sys/block/zramX/backing_dev.
26 See Documentation/blockdev/zram.txt for more information.
28 config ZRAM_MEMORY_TRACKING
29 bool "Track zRam block status"
30 depends on ZRAM && DEBUG_FS
32 With this feature, admin can track the state of allocated blocks
33 of zRAM. Admin could see the information via
34 /sys/kernel/debug/zram/zramX/block_state.
36 See Documentation/blockdev/zram.txt for more information.