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zram: add incompressible writeback

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Add support for incompressible pages writeback:

  echo incompressible > /sys/block/zramX/writeback

Link: https://lkml.kernel.org/r/20221109115047.2921851-13-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Alexey Romanov <avromanov@sberdevices.ru>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Suleiman Souhlal <suleiman@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky
2022-11-09 20:50:46 +09:00
committed by Andrew Morton
parent 443dd79806
commit b46f9ea3cb
2 changed files with 18 additions and 7 deletions
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7
Documentation/admin-guide/blockdev/zram.rst
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@@ -348,8 +348,13 @@ this can be accomplished with::
echo huge_idle > /sys/block/zramX/writeback
If a user chooses to writeback only incompressible pages (pages that none of
algorithms can compress) this can be accomplished with::
echo incompressible > /sys/block/zramX/writeback
If an admin wants to write a specific page in zram device to the backing device,
they could write a page index into the interface.
they could write a page index into the interface::
echo "page_index=1251" > /sys/block/zramX/writeback