Comment # 5 on bug 1200669 from Takashi Iwai

Yeah, it's a bit annoying.

I toss this bug entry to the performance team.  FWIW, the upstream commit that
changed the behavior is e4042ad492357fa995921376462b04a025dd53b6
    delayacct: Default disabled

We may revert this for SLE15-SPx to align with the old behavior, but it'd need
a verification from the performance POV, I guess.

OTOH, it seems that this feature isn't required in general, and the workaround
for iotop could be documented to the release notes, too.

There is a new sysfs entry for toggling it on the fly, too.  See commit
0cd7c741f01de13dc1eecf22557593b3514639bb
    delayacct: Add sysctl to enable at runtime