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| author | Miao Xie <miaox@cn.fujitsu.com> | 2013-04-05 09:20:56 +0200 |
|---|---|---|
| committer | Josef Bacik <jbacik@fusionio.com> | 2013-05-06 21:54:35 +0200 |
| commit | e4100d987b2437596ebcf11809022b79507f3db1 (patch) | |
| tree | 2e1b987afa41149ef621581f1eb125c027453f74 /fs/btrfs/extent_io.h | |
| parent | Btrfs: fix bad extent logging (diff) | |
| download | linux-e4100d987b2437596ebcf11809022b79507f3db1.tar.xz linux-e4100d987b2437596ebcf11809022b79507f3db1.zip | |
Btrfs: improve the performance of the csums lookup
It is very likely that there are several blocks in bio, it is very
inefficient if we get their csums one by one. This patch improves
this problem by getting the csums in batch.
According to the result of the following test, the execute time of
__btrfs_lookup_bio_sums() is down by ~28%(300us -> 217us).
# dd if=<mnt>/file of=/dev/null bs=1M count=1024
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs/btrfs/extent_io.h')
| -rw-r--r-- | fs/btrfs/extent_io.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 258c92156857..db009d80bef4 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -261,6 +261,10 @@ int extent_readpages(struct extent_io_tree *tree, int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, __u64 start, __u64 len, get_extent_t *get_extent); int set_state_private(struct extent_io_tree *tree, u64 start, u64 private); +void extent_cache_csums_dio(struct extent_io_tree *tree, u64 start, u32 csums[], + int count); +void extent_cache_csums(struct extent_io_tree *tree, struct bio *bio, + int bvec_index, u32 csums[], int count); int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); void set_page_extent_mapped(struct page *page); |