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| author | Chris Mason <chris.mason@oracle.com> | 2007-10-15 16:18:14 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:03:56 -0400 |
| commit | 4dc119046d0d8501afa4346472917fb05586ad9c (patch) | |
| tree | 712c98f8f66aa1e83020574a19d015df88c5024e /fs/btrfs/extent_map.h | |
| parent | e19caa5f0e34b571ed0c2617554af5c43cb124d1 (diff) | |
| download | linux-4dc119046d0d8501afa4346472917fb05586ad9c.tar.gz linux-4dc119046d0d8501afa4346472917fb05586ad9c.tar.bz2 linux-4dc119046d0d8501afa4346472917fb05586ad9c.zip | |
Btrfs: Add an extent buffer LRU to reduce radix tree hits
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_map.h')
| -rw-r--r-- | fs/btrfs/extent_map.h | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h index 8409b5cbeda7..52a8b9394fc6 100644 --- a/fs/btrfs/extent_map.h +++ b/fs/btrfs/extent_map.h @@ -16,6 +16,7 @@ #define EXTENT_DELALLOC (1 << 5) #define EXTENT_DEFRAG (1 << 6) #define EXTENT_DEFRAG_DONE (1 << 7) +#define EXTENT_BUFFER_FILLED (1 << 8) #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) @@ -33,6 +34,9 @@ struct extent_map_tree { struct address_space *mapping; rwlock_t lock; struct extent_map_ops *ops; + spinlock_t lru_lock; + struct list_head buffer_lru; + int lru_size; }; /* note, this must start with the same fields as fs/extent_map.c:tree_entry */ @@ -64,20 +68,17 @@ struct extent_state { struct list_head list; }; -#define EXTENT_INLINE_PAGES 32 struct extent_buffer { u64 start; unsigned long len; - atomic_t refs; - int flags; - struct list_head list; - struct list_head leak_list; - unsigned long alloc_addr; char *map_token; char *kaddr; unsigned long map_start; unsigned long map_len; - struct page *pages[EXTENT_INLINE_PAGES]; + struct page *last_page; + struct list_head lru; + atomic_t refs; + int flags; }; typedef struct extent_map *(get_extent_t)(struct inode *inode, @@ -88,6 +89,7 @@ typedef struct extent_map *(get_extent_t)(struct inode *inode, void extent_map_tree_init(struct extent_map_tree *tree, struct address_space *mapping, gfp_t mask); +void extent_map_tree_cleanup(struct extent_map_tree *tree); struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, u64 start, u64 end); int add_extent_mapping(struct extent_map_tree *tree, |