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Commit d57e62b8 authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: try to free metadata pages when we free btree blocks 



COW means we cycle though blocks fairly quickly, and once we
free an extent on disk, it doesn't make much sense to keep the pages around.

This commit tries to immediately free the page when we free the extent,
which lowers our memory footprint significantly.

Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 5a3f23d5

fs/btrfs/extent-tree.c

+4 −0
Original line number Diff line number Diff line
@@ -2384,6 +2384,10 @@ static int __free_extent(struct btrfs_trans_handle *trans, 
		if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {

			ret = btrfs_del_csums(trans, root, bytenr, num_bytes);

			BUG_ON(ret);

		} else {

			invalidate_mapping_pages(info->btree_inode->i_mapping,

			     bytenr >> PAGE_CACHE_SHIFT,

			     (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT);

		}



		ret = update_block_group(trans, root, bytenr, num_bytes, 0,