[11/13] btrfs: add cond_resched() calls when resolving backrefs

Commit Message

Edmund Nadolski June 20, 2017, 4:06 p.m. UTC

Since backref resolution is CPU-intensive, the cond_resched calls
should help alleviate soft lockup occurences.

Signed-off-by: Edmund Nadolski <[e-mail]>
Signed-off-by: Jeff Mahoney <[e-mail]>
---
 fs/btrfs/backref.c | 3 +++
 1 file changed, 3 insertions(+)

Patch

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 0dffd7e..e95049a 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -658,6 +658,7 @@  static int resolve_indirect_refs(struct btrfs_fs_info *fs_info,
 		prelim_ref_insert(fs_info, &preftrees->direct, ref);
 
 		ulist_reinit(parents);
+		cond_resched();
 	}
 out:
 	ulist_free(parents);
@@ -697,6 +698,7 @@  static int add_missing_keys(struct btrfs_fs_info *fs_info,
 			btrfs_node_key_to_cpu(eb, &ref->key_for_search, 0);
 		btrfs_tree_read_unlock(eb);
 		free_extent_buffer(eb);
+		cond_resched();
 	}
 	return 0;
 }
@@ -1236,6 +1238,7 @@  static int find_parent_nodes(struct btrfs_trans_handle *trans,
 			}
 			eie = NULL;
 		}
+		cond_resched();
 	}
 
 out: