At unmap, fork and remap time hugetlb address ranges are linearly
scanned.  We can optimize these scans if the ranges are sparsely
populated.  Also, enable page table "Lazy copy" for hugetlb at fork.

Mike Kravetz (3):
  hugetlb: skip to end of PT page mapping when pte not present
  hugetlb: do not update address in huge_pmd_unshare
  hugetlb: Lazy page table copies in fork()

 include/linux/hugetlb.h |   5 +-
 mm/hugetlb.c            | 104 ++++++++++++++++++++++++++++------------
 mm/memory.c             |   2 +-
 mm/rmap.c               |   4 +-
 4 files changed, 79 insertions(+), 36 deletions(-)

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2.35.3