2 tristate "Compressed RAM block device support"
3 depends on BLOCK && SYSFS && CRYPTO
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.
13 It has several use cases, for example: /tmp storage, use as swap
14 disks and maybe many more.
16 See Documentation/blockdev/zram.txt for more information.
19 bool "Write back incompressible page to backing device"
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.
28 See Documentation/blockdev/zram.txt for more information.
30 config ZRAM_MEMORY_TRACKING
31 bool "Track zRam block status"
32 depends on ZRAM && DEBUG_FS
34 With this feature, admin can track the state of allocated blocks
35 of zRAM. Admin could see the information via
36 /sys/kernel/debug/zram/zramX/block_state.
38 See Documentation/blockdev/zram.txt for more information.
40 config ZRAM_DEFAULT_COMP_ALGORITHM
41 string "Default ZRAM compression algorithm"
47 prompt "Default zRAM compressed memory allocator"
48 default ZRAM_DEFAULT_ZSMALLOC
50 Select the compressed memory allocator that will be used by default
53 config ZRAM_DEFAULT_ZBUD
57 config ZRAM_DEFAULT_Z3FOLD
61 config ZRAM_DEFAULT_ZSMALLOC
67 config ZRAM_DEFAULT_POOL
69 default "zbud" if ZRAM_DEFAULT_ZBUD
70 default "z3fold" if ZRAM_DEFAULT_Z3FOLD
71 default "zsmalloc" if ZRAM_DEFAULT_ZSMALLOC