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zram: add config and doc file for writeback feature
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>
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@ -90,3 +90,11 @@ Description:
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device's debugging info useful for kernel developers. Its
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device's debugging info useful for kernel developers. Its
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format is not documented intentionally and may change
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format is not documented intentionally and may change
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anytime without any notice.
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anytime without any notice.
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What: /sys/block/zram<id>/backing_dev
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Date: June 2017
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Contact: Minchan Kim <minchan@kernel.org>
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Description:
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The backing_dev file is read-write and set up backing
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device for zram to write incompressible pages.
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For using, user should enable CONFIG_ZRAM_WRITEBACK.
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@ -168,6 +168,7 @@ max_comp_streams RW the number of possible concurrent compress operations
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comp_algorithm RW show and change the compression algorithm
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comp_algorithm RW show and change the compression algorithm
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compact WO trigger memory compaction
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compact WO trigger memory compaction
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debug_stat RO this file is used for zram debugging purposes
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debug_stat RO this file is used for zram debugging purposes
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backing_dev RW set up backend storage for zram to write out
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User space is advised to use the following files to read the device statistics.
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User space is advised to use the following files to read the device statistics.
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@ -231,5 +232,15 @@ line of text and contains the following stats separated by whitespace:
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resets the disksize to zero. You must set the disksize again
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resets the disksize to zero. You must set the disksize again
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before reusing the device.
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before reusing the device.
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* Optional Feature
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= writeback
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With incompressible pages, there is no memory saving with zram.
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Instead, with CONFIG_ZRAM_WRITEBACK, zram can write incompressible page
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to backing storage rather than keeping it in memory.
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User should set up backing device via /sys/block/zramX/backing_dev
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before disksize setting.
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Nitin Gupta
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Nitin Gupta
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ngupta@vflare.org
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ngupta@vflare.org
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@ -13,3 +13,15 @@ config ZRAM
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disks and maybe many more.
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disks and maybe many more.
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See zram.txt for more information.
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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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