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authorJosef Bacik <josef@redhat.com>2011-05-13 10:32:11 -0400
committerJosef Bacik <josef@redhat.com>2011-05-23 13:03:14 -0400
commit026fd317828500524cdc7e5ff9e8e7923abb2868 (patch)
treed303bffbd895c307f49286cd90186cf58223dde2 /fs/btrfs/relocation.c
parent589d8ade83f07c0f11c8191c0ca309f34d7a2c14 (diff)
downloadlinux-026fd317828500524cdc7e5ff9e8e7923abb2868.tar.gz
Btrfs: don't always do readahead
Our readahead is sort of sloppy, and really isn't always needed. For example if ls is doing a stating ls (which is the default) it's going to stat in non-disk order, so if say you have a directory with a stupid amount of files, readahead is going to do nothing but waste time in the case of doing the stat. Taking the unconditional readahead out made my test go from 57 minutes to 36 minutes. This means that everywhere we do loop through the tree we want to make sure we do set path->reada properly, so I went through and found all of the places where we loop through the path and set reada to 1. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
Diffstat (limited to 'fs/btrfs/relocation.c')
-rw-r--r--fs/btrfs/relocation.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 09c30d37d43..5872b41581f 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -676,6 +676,8 @@ struct backref_node *build_backref_tree(struct reloc_control *rc,
err = -ENOMEM;
goto out;
}
+ path1->reada = 1;
+ path2->reada = 2;
node = alloc_backref_node(cache);
if (!node) {
@@ -1996,6 +1998,7 @@ static noinline_for_stack int merge_reloc_root(struct reloc_control *rc,
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
+ path->reada = 1;
reloc_root = root->reloc_root;
root_item = &reloc_root->root_item;
@@ -3297,6 +3300,7 @@ static int find_data_references(struct reloc_control *rc,
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
+ path->reada = 1;
root = read_fs_root(rc->extent_root->fs_info, ref_root);
if (IS_ERR(root)) {
@@ -3665,6 +3669,7 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
+ path->reada = 1;
ret = prepare_to_relocate(rc);
if (ret) {
@@ -4090,6 +4095,7 @@ int btrfs_recover_relocation(struct btrfs_root *root)
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
+ path->reada = -1;
key.objectid = BTRFS_TREE_RELOC_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;