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9f3310ccc7
When Compressed RAM block device support is disabled, the
CONFIG_ZRAM_DEF_COMP symbol still ends up in the generated config file:
CONFIG_ZRAM_DEF_COMP="unset-value"
While this causes no real harm, avoid polluting the config file by
adding a dependency on ZRAM.
Link: https://lkml.kernel.org/r/64e05bad68a9bd5cc322efd114a04d25de525940.1730807319.git.geert@linux-m68k.org
Fixes: 917a59e81c ("zram: introduce custom comp backends API")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
148 lines
3.8 KiB
Plaintext
148 lines
3.8 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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config ZRAM
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tristate "Compressed RAM block device support"
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depends on BLOCK && SYSFS && MMU
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select ZSMALLOC
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help
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Creates virtual block devices called /dev/zramX (X = 0, 1, ...).
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Pages written to these disks are compressed and stored in memory
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itself. These disks allow very fast I/O and compression provides
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good amounts of memory savings.
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It has several use cases, for example: /tmp storage, use as swap
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disks and maybe many more.
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See Documentation/admin-guide/blockdev/zram.rst for more information.
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config ZRAM_BACKEND_LZ4
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bool "lz4 compression support"
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depends on ZRAM
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select LZ4_COMPRESS
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select LZ4_DECOMPRESS
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config ZRAM_BACKEND_LZ4HC
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bool "lz4hc compression support"
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depends on ZRAM
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select LZ4HC_COMPRESS
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select LZ4_DECOMPRESS
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config ZRAM_BACKEND_ZSTD
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bool "zstd compression support"
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depends on ZRAM
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select ZSTD_COMPRESS
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select ZSTD_DECOMPRESS
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config ZRAM_BACKEND_DEFLATE
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bool "deflate compression support"
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depends on ZRAM
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select ZLIB_DEFLATE
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select ZLIB_INFLATE
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config ZRAM_BACKEND_842
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bool "842 compression support"
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depends on ZRAM
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select 842_COMPRESS
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select 842_DECOMPRESS
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config ZRAM_BACKEND_FORCE_LZO
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depends on ZRAM
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def_bool !ZRAM_BACKEND_LZ4 && !ZRAM_BACKEND_LZ4HC && \
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!ZRAM_BACKEND_ZSTD && !ZRAM_BACKEND_DEFLATE && \
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!ZRAM_BACKEND_842
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config ZRAM_BACKEND_LZO
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bool "lzo and lzo-rle compression support" if !ZRAM_BACKEND_FORCE_LZO
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depends on ZRAM
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default ZRAM_BACKEND_FORCE_LZO
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select LZO_COMPRESS
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select LZO_DECOMPRESS
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choice
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prompt "Default zram compressor"
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default ZRAM_DEF_COMP_LZORLE
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depends on ZRAM
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config ZRAM_DEF_COMP_LZORLE
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bool "lzo-rle"
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depends on ZRAM_BACKEND_LZO
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config ZRAM_DEF_COMP_LZO
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bool "lzo"
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depends on ZRAM_BACKEND_LZO
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config ZRAM_DEF_COMP_LZ4
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bool "lz4"
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depends on ZRAM_BACKEND_LZ4
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config ZRAM_DEF_COMP_LZ4HC
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bool "lz4hc"
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depends on ZRAM_BACKEND_LZ4HC
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config ZRAM_DEF_COMP_ZSTD
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bool "zstd"
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depends on ZRAM_BACKEND_ZSTD
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config ZRAM_DEF_COMP_DEFLATE
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bool "deflate"
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depends on ZRAM_BACKEND_DEFLATE
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config ZRAM_DEF_COMP_842
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bool "842"
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depends on ZRAM_BACKEND_842
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endchoice
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config ZRAM_DEF_COMP
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string
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depends on ZRAM
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default "lzo-rle" if ZRAM_DEF_COMP_LZORLE
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default "lzo" if ZRAM_DEF_COMP_LZO
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default "lz4" if ZRAM_DEF_COMP_LZ4
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default "lz4hc" if ZRAM_DEF_COMP_LZ4HC
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default "zstd" if ZRAM_DEF_COMP_ZSTD
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default "deflate" if ZRAM_DEF_COMP_DEFLATE
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default "842" if ZRAM_DEF_COMP_842
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default "unset-value"
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config ZRAM_WRITEBACK
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bool "Write back incompressible or idle page to backing device"
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depends on ZRAM
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help
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This lets zram entries (incompressible or idle pages) be written
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back to a backing device, helping save memory.
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For this feature, admin should set up backing device via
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/sys/block/zramX/backing_dev.
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With /sys/block/zramX/{idle,writeback}, application could ask
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idle page's writeback to the backing device to save in memory.
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See Documentation/admin-guide/blockdev/zram.rst for more information.
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config ZRAM_TRACK_ENTRY_ACTIME
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bool "Track access time of zram entries"
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depends on ZRAM
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help
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With this feature zram tracks access time of every stored
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entry (page), which can be used for a more fine grained IDLE
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pages writeback.
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config ZRAM_MEMORY_TRACKING
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bool "Track zRam block status"
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depends on ZRAM && DEBUG_FS
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select ZRAM_TRACK_ENTRY_ACTIME
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help
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With this feature, admin can track the state of allocated blocks
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of zRAM. Admin could see the information via
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/sys/kernel/debug/zram/zramX/block_state.
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See Documentation/admin-guide/blockdev/zram.rst for more information.
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config ZRAM_MULTI_COMP
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bool "Enable multiple compression streams"
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depends on ZRAM
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help
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This will enable multi-compression streams, so that ZRAM can
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re-compress pages using a potentially slower but more effective
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compression algorithm. Note, that IDLE page recompression
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requires ZRAM_TRACK_ENTRY_ACTIME.
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