f2fs: use vmalloc instead of kvmalloc in .init_{,de}compress_ctx

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[ Upstream commit 70dd07c888 ]

.init_{,de}compress_ctx uses kvmalloc() to alloc memory, it will try
to allocate physically continuous page first, it may cause more memory
allocation pressure, let's use vmalloc instead to mitigate it.

[Test]
cd /data/local/tmp
touch file
f2fs_io setflags compression file
f2fs_io getflags file
for i in $(seq 1 10); do sync; echo 3 > /proc/sys/vm/drop_caches;\
time f2fs_io write 512 0 4096 zero osync file; truncate -s 0 file;\
done

[Result]
Before		After		Delta
21.243		21.694		-2.12%

For compression, we recommend to use ioctl to compress file data in
background for workaround.

For decompression, only zstd will be affected.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Chao Yu 2025-05-13 13:57:20 +08:00 • committed by Greg Kroah-Hartman

parent 92dbc2a2e2

commit 61fc32485d

2 changed files with 15 additions and 13 deletions

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23

fs/f2fs/compress.c

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5

fs/f2fs/f2fs.h

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