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authorChris Mason <chris.mason@oracle.com>2009-09-02 13:24:36 -0400
committerChris Mason <chris.mason@oracle.com>2009-09-11 13:31:06 -0400
commit1edbb734b4e010974c41d2859d22a43d04f5f1cf (patch)
tree4f43aea677f7206707540dd8622fa4cac099057a /fs/btrfs/extent_io.h
parente48c465bb366c0169f7908bfe62ae7080874ee7d (diff)
Btrfs: reduce CPU usage in the extent_state tree
Btrfs is currently mirroring some of the page state bits into its extent state tree. The goal behind this was to use it in supporting blocksizes other than the page size. But, we don't currently support that, and we're using quite a lot of CPU on the rb tree and its spin lock. This commit starts a series of cleanups to reduce the amount of work done in the extent state tree as part of each IO. This commit: * Adds the ability to lock an extent in the state tree and also set other bits. The idea is to do locking and delalloc in one call * Removes the EXTENT_WRITEBACK and EXTENT_DIRTY bits. Btrfs is using a combination of the page bits and the ordered write code for this instead. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_io.h')
-rw-r--r--fs/btrfs/extent_io.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 5bc20abf3f3d..88d134d01fbc 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -142,6 +142,8 @@ int try_release_extent_state(struct extent_map_tree *map,
142 struct extent_io_tree *tree, struct page *page, 142 struct extent_io_tree *tree, struct page *page,
143 gfp_t mask); 143 gfp_t mask);
144int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); 144int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
145int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
146 int bits, gfp_t mask);
145int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask); 147int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
146int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end, 148int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
147 gfp_t mask); 149 gfp_t mask);