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Btrfs: change the ordered tree to use a spinlock instead of a mutex

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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>
This commit is contained in:
Josef Bacik
2010-02-02 21:48:28 +00:00
committed by Chris Mason
parent 4125bf761c
commit 49958fd7db
2 changed files with 19 additions and 19 deletions
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4
fs/btrfs/ordered-data.h
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@@ -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;
}