MFC r270383: MFV r270198:

Instead of using timestamp in the AVL, use the memory address when
comparing.

Illumos issue:
    5095 panic when adding a duplicate dbuf to dn_dbufs
MFC r270384:

Update hptnr(4) driver to version 1.0.1 supplied by the vendor.

v1.0.1 2014-8-19
  * Do not retry the command and reset the disk when failed to enable or
    disable spin up feature.
  * Fix up a bug that disk failed to probe if driver failed to access the
    10th LBA.
  * Fix a bug that request timeout but it has been completed in certain
    cases.
  * Support smartmontool for R750.

Many thanks to HighPoint for continued support of FreeBSD!
MFC r269963+269964:

Re-instate UMA cached backend for 4K - 64K allocations.  New consumers
like geli(4) uses malloc(9) to allocate temporary buffers that gets
free'ed shortly, causing frequent TLB shootdown as observed in hwpmc
supported flame graph.

Add a new loader tunable, vm.kmem_zmax which allows a system administrator
to limit the maximum allocation size that malloc(9) would consider using
the UMA cache allocator as backend.