2008/7/26 Chris Mason <chris.mason@xxxxxxxxxx>: > I have modified this locally to always cache leaves, even when they > don't have file extents in them. That way, walk_down_tree will find the > cache and won't have to read the leaf (that doesn't have any extents). > > So far, it is working very well. I did a run with fs_mark to create 58 > million files and had very steady numbers. The unmount took 4 seconds. > It used to take over an hour. > > One question, why not use the block number (byte number) as the key to > the rbtree instead of the key? > When dropping old snapshots, tree leaves are processed in ascending order of btrfs_key. After a given tree leaf is processed, we remove the corresponding cache entry and update tree->last to point to next entry in the tree. Therefore btrfs_lookup_leaf_ref can find the wanted entry in tree->last in most cases. Regards YZ -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
