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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: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2009-03-31 13:47:50 -04:00
parent 5a3f23d515
commit d57e62b897
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/extent-tree.c
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@ -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,