109 lines
3.2 KiB
Plaintext
109 lines
3.2 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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config AMLOGIC_ZRAM
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tristate "Compressed RAM block device support"
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depends on BLOCK && SYSFS && MMU
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depends on AMLOGIC_AMFC
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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 AMLOGIC_ZRAM_BACKEND_LZ4
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bool "lz4 compression support"
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depends on AMLOGIC_ZRAM
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config AMLOGIC_ZRAM_BACKEND_LZO
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bool "lzo and lzo-rle compression support"
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depends on AMLOGIC_ZRAM
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depends on CONFIG_LZO_COMPRESS
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depends on CONFIG_LZO_DECOMPRESS
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config AMLOGIC_ZRAM_BACKEND_AMFC
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bool "amfc compression support"
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depends on AMLOGIC_ZRAM
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depends on AMLOGIC_AMFC
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choice
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prompt "Default zram compressor"
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default AMLOGIC_ZRAM_DEF_COMP_LZ4
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depends on AMLOGIC_ZRAM
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config AMLOGIC_ZRAM_DEF_COMP_LZO
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bool "lzo"
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depends on AMLOGIC_ZRAM_BACKEND_LZO
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config AMLOGIC_ZRAM_DEF_COMP_LZ4
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bool "lz4"
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depends on AMLOGIC_ZRAM_BACKEND_LZ4
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config AMLOGIC_ZRAM_DEF_COMP_AMFC
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bool "amfc"
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depends on AMLOGIC_ZRAM_BACKEND_AMFC
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endchoice
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config AMLOGIC_ZRAM_DEF_COMP
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string
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default "lzo" if AMLOGIC_ZRAM_DEF_COMP_LZO
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default "lz4" if AMLOGIC_ZRAM_DEF_COMP_LZ4
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default "amfc" if AMLOGIC_ZRAM_DEF_COMP_AMFC
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default "unset-value"
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config AMLOGIC_ZRAM_WRITEBACK
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bool "Write back incompressible or idle page to backing device"
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depends on AMLOGIC_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 AMLOGIC_ZRAM_TRACK_ENTRY_ACTIME
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bool "Track access time of zram entries"
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depends on AMLOGIC_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 AMLOGIC_ZRAM_MEMORY_TRACKING
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bool "Track zRam block status"
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depends on AMLOGIC_ZRAM && DEBUG_FS
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select AMLOGIC_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 AMLOGIC_ZRAM_MULTI_COMP
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bool "Enable multiple compression streams"
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depends on AMLOGIC_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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config AMLOGIC_ZSM
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bool "Amlogic ZRAM Same object Merging"
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depends on AMLOGIC_ZRAM
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default n
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help
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This driver enabled same object merge in ZRAM
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like ksm. it can help to save zram used memory
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