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authorChris Mason <chris.mason@oracle.com>2008-09-24 14:51:30 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 15:41:59 -0400
commit24ab9cd85c11bccacbd0cce7f8e1aebd4930404c (patch)
tree2ace993dd54bb6dd94fdd4c0cb03813c6bf4c6a3 /fs/btrfs/ctree.h
parent4434c33c7f233a7ee5dcaf357fbf795818ea8861 (diff)
Btrfs: Raise thresholds for metadata writeback
Btrfs metadata writeback is fairly expensive. Once a tree block is written it must be cowed before it can be changed again. The btree writepages code has a threshold based on a count of dirty btree bytes which is updated as IO is sent out. This changes btree_writepages to skip the writeout if there are less than 32MB of dirty bytes from the btrees, improving performance across many workloads. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
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