f2fs: let fstrim issue discard commands in lower priority

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The fstrim gathers huge number of large discard commands, and tries to issue
without IO awareness, which results in long user-perceive IO latencies on
READ, WRITE, and FLUSH in UFS. We've observed some of commands take several
seconds due to long discard latency.

This patch limits the maximum size to 2MB per candidate, and check IO congestion
when issuing them to disk.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

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This commit is contained in:

Jaegeuk Kim 2018-05-24 13:57:26 -07:00

parent 5b19d284f5

commit 9a997188ff

2 changed files with 78 additions and 65 deletions

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4

fs/f2fs/f2fs.h

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139

fs/f2fs/segment.c

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