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f2fs: move f2fs to use reader-unfair rwsems

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f2fs rw_semaphores work better if writers can starve readers,
especially for the checkpoint thread, because writers are strictly
more important than reader threads. This prevents significant priority
inversion between low-priority readers that blocked while trying to
acquire the read lock and a second acquisition of the write lock that
might be blocking high priority work.

Signed-off-by: Tim Murray <timmurray@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Tim Murray 2022-01-07 12:48:44 -08:00 • committed by Jaegeuk Kim
commit e4544b63a7
16 changed files with 342 additions and 274 deletions
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