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| author | Liu Bo | 2018-08-22 21:51:50 +0200 |
|---|---|---|
| committer | David Sterba | 2018-10-15 17:23:33 +0200 |
| commit | e3d039656384288bbe952413d8d404b3035fe7d7 (patch) | |
| tree | 0a1f7bfe1f829f2ba99c938ab0ffb03eb27fa6ac /fs/btrfs/extent-tree.c | |
| parent | Btrfs: delayed-refs: use rb_first_cached for href_root (diff) | |
| download | kernel-qcow2-linux-e3d039656384288bbe952413d8d404b3035fe7d7.tar.gz kernel-qcow2-linux-e3d039656384288bbe952413d8d404b3035fe7d7.tar.xz kernel-qcow2-linux-e3d039656384288bbe952413d8d404b3035fe7d7.zip | |
Btrfs: delayed-refs: use rb_first_cached for ref_tree
rb_first_cached() trades an extra pointer "leftmost" for doing the same
job as rb_first() but in O(1).
Functions manipulating href->ref_tree need to get the first entry, this
converts href->ref_tree to use rb_first_cached().
For more details about the optimization see patch "Btrfs: delayed-refs:
use rb_first_cached for href_root".
Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 30b3d8561768..26fb9cbf3807 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2374,7 +2374,7 @@ select_delayed_ref(struct btrfs_delayed_ref_head *head) { struct btrfs_delayed_ref_node *ref; - if (RB_EMPTY_ROOT(&head->ref_tree)) + if (RB_EMPTY_ROOT(&head->ref_tree.rb_root)) return NULL; /* @@ -2387,7 +2387,7 @@ select_delayed_ref(struct btrfs_delayed_ref_head *head) return list_first_entry(&head->ref_add_list, struct btrfs_delayed_ref_node, add_list); - ref = rb_entry(rb_first(&head->ref_tree), + ref = rb_entry(rb_first_cached(&head->ref_tree), struct btrfs_delayed_ref_node, ref_node); ASSERT(list_empty(&ref->add_list)); return ref; @@ -2448,7 +2448,7 @@ static int cleanup_ref_head(struct btrfs_trans_handle *trans, spin_unlock(&head->lock); spin_lock(&delayed_refs->lock); spin_lock(&head->lock); - if (!RB_EMPTY_ROOT(&head->ref_tree) || head->extent_op) { + if (!RB_EMPTY_ROOT(&head->ref_tree.rb_root) || head->extent_op) { spin_unlock(&head->lock); spin_unlock(&delayed_refs->lock); return 1; @@ -2597,7 +2597,7 @@ static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, actual_count++; ref->in_tree = 0; - rb_erase(&ref->ref_node, &locked_ref->ref_tree); + rb_erase_cached(&ref->ref_node, &locked_ref->ref_tree); RB_CLEAR_NODE(&ref->ref_node); if (!list_empty(&ref->add_list)) list_del(&ref->add_list); @@ -3040,7 +3040,8 @@ static noinline int check_delayed_ref(struct btrfs_root *root, * XXX: We should replace this with a proper search function in the * future. */ - for (node = rb_first(&head->ref_tree); node; node = rb_next(node)) { + for (node = rb_first_cached(&head->ref_tree); node; + node = rb_next(node)) { ref = rb_entry(node, struct btrfs_delayed_ref_node, ref_node); /* If it's a shared ref we know a cross reference exists */ if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) { @@ -6908,7 +6909,7 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans, goto out_delayed_unlock; spin_lock(&head->lock); - if (!RB_EMPTY_ROOT(&head->ref_tree)) + if (!RB_EMPTY_ROOT(&head->ref_tree.rb_root)) goto out; if (head->extent_op) { |