Comment 2 for bug 2021571

Was the cause of this ever determined? I am seeing something similar on some of my systems. Times are usually around 1s, sometimes higher. A recent high was 1.7s

# uname -r
4.15.0-193-generic

# time cat /sys/fs/cgroup/blkio/blkio.time_recursive
8:144 69349171178307
8:128 4718621058
8:112 4604996397
8:96 4625378704
8:80 4873085108
8:64 3777190161
8:48 4749702443
8:32 8346248400
8:16 9260262419
8:0 154939957376379

real 0m1.03s
user 0m0.00s
sys 0m1.03s