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authorJosef Bacik <josef@redhat.com>2010-02-02 21:48:28 +0000
committerChris Mason <chris.mason@oracle.com>2010-03-15 11:00:12 -0400
commit49958fd7dbb83cd4d65179d025940e01fe1fbacd (patch)
tree4a29e47c0935375968971450a2f2949bbd3cdd43 /fs/btrfs/ordered-data.h
parent4125bf761cd0786e1163e024c7c809ce2cc625bc (diff)
downloadop-kernel-dev-49958fd7dbb83cd4d65179d025940e01fe1fbacd.zip
op-kernel-dev-49958fd7dbb83cd4d65179d025940e01fe1fbacd.tar.gz
Btrfs: change the ordered tree to use a spinlock instead of a mutex
The ordered tree used to need a mutex, but currently all we use it for is to protect the rb_tree, and a spin_lock is just fine for that. Using a spin_lock instead makes dbench run a little faster, 58 mb/s instead of 51 mb/s, and have less latency, 3445.138 ms instead of 3820.633 ms. Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ordered-data.h')
-rw-r--r--fs/btrfs/ordered-data.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
index 9116c6d..bfbcebb 100644
--- a/fs/btrfs/ordered-data.h
+++ b/fs/btrfs/ordered-data.h
@@ -21,7 +21,7 @@
/* one of these per inode */
struct btrfs_ordered_inode_tree {
- struct mutex mutex;
+ spinlock_t lock;
struct rb_root tree;
struct rb_node *last;
};
@@ -128,7 +128,7 @@ static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
static inline void
btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
{
- mutex_init(&t->mutex);
+ spin_lock_init(&t->lock);
t->tree = RB_ROOT;
t->last = NULL;
}
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