From 96acb3753e0740e0a3148640927dcf3249f09f5d Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Thu, 17 Feb 2022 12:12:05 +0000 Subject: 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: Filipe Manana Signed-off-by: David Sterba --- fs/btrfs/tree-log.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 0b841eab6169..b6abc716aff2 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -5712,6 +5712,13 @@ next_key: } 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, -- cgit v1.2.3