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Diffstat (limited to 'drivers/block/zram/Kconfig')
| -rw-r--r-- | drivers/block/zram/Kconfig | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig new file mode 100644 index 0000000000..0386b7da02 --- /dev/null +++ b/drivers/block/zram/Kconfig @@ -0,0 +1,89 @@ +# SPDX-License-Identifier: GPL-2.0 +config ZRAM + tristate "Compressed RAM block device support" + depends on BLOCK && SYSFS && MMU + depends on CRYPTO_LZO || CRYPTO_ZSTD || CRYPTO_LZ4 || CRYPTO_LZ4HC || CRYPTO_842 + select ZSMALLOC + 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 Documentation/admin-guide/blockdev/zram.rst for more information. + +choice + prompt "Default zram compressor" + default ZRAM_DEF_COMP_LZORLE + depends on ZRAM + +config ZRAM_DEF_COMP_LZORLE + bool "lzo-rle" + depends on CRYPTO_LZO + +config ZRAM_DEF_COMP_ZSTD + bool "zstd" + depends on CRYPTO_ZSTD + +config ZRAM_DEF_COMP_LZ4 + bool "lz4" + depends on CRYPTO_LZ4 + +config ZRAM_DEF_COMP_LZO + bool "lzo" + depends on CRYPTO_LZO + +config ZRAM_DEF_COMP_LZ4HC + bool "lz4hc" + depends on CRYPTO_LZ4HC + +config ZRAM_DEF_COMP_842 + bool "842" + depends on CRYPTO_842 + +endchoice + +config ZRAM_DEF_COMP + string + default "lzo-rle" if ZRAM_DEF_COMP_LZORLE + default "zstd" if ZRAM_DEF_COMP_ZSTD + default "lz4" if ZRAM_DEF_COMP_LZ4 + default "lzo" if ZRAM_DEF_COMP_LZO + default "lz4hc" if ZRAM_DEF_COMP_LZ4HC + default "842" if ZRAM_DEF_COMP_842 + +config ZRAM_WRITEBACK + bool "Write back incompressible or idle page to backing device" + depends on ZRAM + help + With incompressible page, there is no memory saving to keep it + in memory. Instead, write it out to backing device. + For this feature, admin should set up backing device via + /sys/block/zramX/backing_dev. + + With /sys/block/zramX/{idle,writeback}, application could ask + idle page's writeback to the backing device to save in memory. + + See Documentation/admin-guide/blockdev/zram.rst for more information. + +config ZRAM_MEMORY_TRACKING + bool "Track zRam block status" + depends on ZRAM && DEBUG_FS + help + With this feature, admin can track the state of allocated blocks + of zRAM. Admin could see the information via + /sys/kernel/debug/zram/zramX/block_state. + + See Documentation/admin-guide/blockdev/zram.rst for more information. + +config ZRAM_MULTI_COMP + bool "Enable multiple compression streams" + depends on ZRAM + help + This will enable multi-compression streams, so that ZRAM can + re-compress pages using a potentially slower but more effective + compression algorithm. Note, that IDLE page recompression + requires ZRAM_MEMORY_TRACKING. |