Commit 96acb375 authored by Filipe Manana's avatar Filipe Manana Committed by David Sterba
Browse files

btrfs: voluntarily relinquish cpu when doing a full fsync 



Doing a full fsync may require processing many leaves of metadata, which
can take some time and result in a task monopolizing a cpu for too long.
So add a cond_resched() after processing a leaf when doing a full fsync,
while not holding any locks on any tree (a subvolume or a log tree).

Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 5b7ce5e2

fs/btrfs/tree-log.c

+7 −0
Original line number Diff line number Diff line
@@ -5712,6 +5712,13 @@ static int copy_inode_items_to_log(struct btrfs_trans_handle *trans, 
		} else {

			break;

		}



		/*

		 * We may process many leaves full of items for our inode, so

		 * avoid monopolizing a cpu for too long by rescheduling while

		 * not holding locks on any tree.

		 */

		cond_resched();

	}

	if (ins_nr) {

		ret = copy_items(trans, inode, dst_path, path, ins_start_slot,