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Feature #4782
closedosd: build writeback model to replace async flusher
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Description
build a model that includes
- dirty bytes value
- dirty files values
- a cost function of bytes and inodes
- an lru
- a writeback initiator with some threshold (analogous to dirty_background_bytes)
- a writeback blocker with some threshold (analogous to dirty_bytes)
replace the current background flush thing with the above.
set sane defaults for btrfs, xfs that roughly model how expensive inode vs content writes are
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