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zram: introduce algorithm_params device attribute

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This attribute is used to setup compression algorithms' parameters, so we
can tweak algorithms' characteristics.  At this point only 'level' is
supported (to be extended in the future).

Each call sets up parameters for one particular algorithm, which should be
specified either by the algorithm's priority or algo name.  This is
expected to be called after corresponding algorithm is selected via
comp_algorithm or recomp_algorithm.

 echo "priority=0 level=1" > /sys/block/zram0/algorithm_params
or
 echo "algo=zstd level=1" > /sys/block/zram0/algorithm_params

Link: https://lkml.kernel.org/r/20240902105656.1383858-16-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nick Terrell <terrelln@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky
2024-09-02 19:56:03 +09:00
committed by Andrew Morton
parent eb826a0190
commit 4eac932103
3 changed files with 76 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-block-zram
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@@ -151,3 +151,10 @@ Contact: Sergey Senozhatsky <senozhatsky@chromium.org>
Description:
The recompress file is write-only and triggers re-compression
with secondary compression algorithms.
What: /sys/block/zram<id>/algorithm_params
Date: August 2024
Contact: Sergey Senozhatsky <senozhatsky@chromium.org>
Description:
The algorithm_params file is write-only and is used to setup
compression algorithm parameters.