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

# 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

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-meta in Ubuntu.
https://bugs.launchpad.net/bugs/2021571

Title:
  cat /sys/fs/cgroup/blkio/blkio.time_recursive  took 1second to
  complete

Status in linux-meta package in Ubuntu:
  Confirmed

Bug description:
  Issue:

  ```console
  # time cat /sys/fs/cgroup/blkio/blkio.time_recursive
  8:16 354721435

  real    0m1.297s
  user    0m0.000s
  sys     0m1.297s
  ```

  As could be seen from above result, cat blkio took about 1 second to complete 
which
  is much longer than a normal case.

  Kernel Version:

  Linux compute08 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02
  UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

  
  Would be appreciated to know any operations to identify the issue, Thank you 
very much for the help.

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