Marvin7 also tracked down this commit as a culprit for
io-fsmark-small-file-stream-ext4 regression:
good-27b38686 bad-077d0c2c
1st-qrtle 1-files/sec 46497.40 21683.10 ( -53.29%)
2nd-qrtle 1-files/sec 45571.70 14200.20 ( -69.02%)
3rd-qrtle 1-files/sec 45103.40 12218.30 ( -73.31%)
Max-90 1-files/sec 45103.40 12218.30 ( -73.31%)