On Wed, 4 Jan 2017, Mel Gorman wrote:

There is a slight disconnect. The bug reports I'm aware of predate the
introduction of "defer" and the current "madvise" semantics for defrag. The
current semantics have not had enough time in the field to generate
reports. I expect lag before users are aware of "defer" due to the number
of recommendations out there about blindly disabling THP.  This because
the majority of users I deal with are not running mainline kernels.

I find it sad that we need to have five options for thp defrag and that 
people now need to research options that don't break their userspace and 
affect all applications on the system, especially when one of those 
options now appears to have a hypothetical usecase, but in the interest of 
making forward progress in this area for support that we truly need, I'll 
reluctantly propose it as a patch.

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