f2fs: Run f2fs_write_end_io() asynchronously

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The bio_for_each_segment_all() loop can take more than 10 ms for a large
bio on an ARM little core. This is too much for interrupt context. Hence
perform the write bio completion work asynchronously if a bio is large and
if f2fs_write_end_io() is called from atomic context. This patch reduces
the time spent in f2fs_write_end_io() from about 10 ms to about 150
microseconds on an Arm Cortex-A520 core if the max_atc_write_bio_size
parameter is changed to 16384.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

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Bart Van Assche 2026-08-03 09:52:22 -07:00 • committed by Jaegeuk Kim

parent 6dc2b804a0

commit 3de6b80941

5 changed files with 35 additions and 1 deletions

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10

Documentation/ABI/testing/sysfs-fs-f2fs

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23

fs/f2fs/data.c

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2

fs/f2fs/f2fs.h

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1

fs/f2fs/super.c

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fs/f2fs/sysfs.c

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