btrfs: only run delayed refs if we're committing
I noticed in a giant dbench run that we spent a lot of time on lock
contention while running transaction commit. This is because dbench
results in a lot of fsync()'s that do a btrfs_transaction_commit(), and
they all run the delayed refs first thing, so they all contend with
each other. This leads to seconds of 0 throughput. Change this to only
run the delayed refs if we're the ones committing the transaction. This
makes the latency go away and we get no more lock contention.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
1 file changed
