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Chao Yu 287b1406dd f2fs: introduce excess_dirty_threshold()
This patch enables f2fs_balance_fs_bg() to check all metadatas' dirty
threshold rather than just checking node block's, so that checkpoint()
from background can be triggered more frequently to avoid heaping up
too much dirty metadatas.

Threshold value by default:
race with foreground ops	single type	global
No				16MB		24MB
Yes				24MB		36MB

In addtion, let f2fs_balance_fs_bg() be aware of roll-forward sapce
as well as fsync().

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
2021-09-20 16:12:51 -07:00
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