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zram: add max_pages param to recompression

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Introduce "max_pages" param to recompress device attribute which sets an
upper limit on the number of entries (pages) zram attempts to recompress
(in this particular recompression call).  S/W recompression can be quite
expensive so limiting the number of pages recompress touches can be quite
helpful.

Link: https://lkml.kernel.org/r/20240329094050.2815699-1-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Brian Geffon <bgeffon@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky
2024-03-29 18:39:41 +09:00
committed by Andrew Morton
parent ba42b524a0
commit 34efe1c3b6
2 changed files with 33 additions and 3 deletions
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5
Documentation/admin-guide/blockdev/zram.rst
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@@ -466,6 +466,11 @@ of equal or greater size:::
#recompress idle pages larger than 2000 bytes
echo "type=idle threshold=2000" > /sys/block/zramX/recompress
It is also possible to limit the number of pages zram re-compression will
attempt to recompress:::
echo "type=huge_idle max_pages=42" > /sys/block/zramX/recompress
Recompression of idle pages requires memory tracking.
During re-compression for every page, that matches re-compression criteria,