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5a47074f02
This patch adds document and kconfig for using of writeback feature. Link: http://lkml.kernel.org/r/1498459987-24562-10-git-send-email-minchan@kernel.org Signed-off-by: Minchan Kim <minchan@kernel.org> Cc: Juneho Choi <juno.choi@lge.com> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
28 lines
908 B
Plaintext
28 lines
908 B
Plaintext
config ZRAM
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tristate "Compressed RAM block device support"
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depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO
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select CRYPTO_LZO
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default n
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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 zram.txt for more information.
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config ZRAM_WRITEBACK
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bool "Write back incompressible page to backing device"
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depends on ZRAM
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default n
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help
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With incompressible page, there is no memory saving to keep it
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in memory. Instead, write it out to backing device.
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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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See zram.txt for more infomration.
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