extend hugepage migration

Here is the 4th version of hugepage migration patchset.
I added Reviewed/Acked tags and applied the feedbacks in the previous discussion
(thank you, all reviewers!):
 - fixed macro (1/8)
 - improved comment and readability (1/8, 3/8, 4/8, 7/8)
 - improved node choice in allocating destination hugepage (7/8)

TODOs: (likely to be done after this work)
 - split page table lock for pmd/pud based hugepage (maybe applicable to thp)
 - improve alloc_migrate_target (especially in node choice)
 - using page walker in check_range

I hope that this series is becoming ready to be merge to -mm tree.
Andrew, could you review and judge this?

Thanks,
Naoya Horiguchi
---
GitHub:
  git://github.com/Naoya-Horiguchi/linux.git extend_hugepage_migration.v4

Test code:
  git://github.com/Naoya-Horiguchi/test_hugepage_migration_extension.git

Naoya Horiguchi (8):
      migrate: make core migration code aware of hugepage
      soft-offline: use migrate_pages() instead of migrate_huge_page()
      migrate: add hugepage migration code to migrate_pages()
      migrate: add hugepage migration code to move_pages()
      mbind: add hugepage migration code to mbind()
      migrate: remove VM_HUGETLB from vma flag check in vma_migratable()
      memory-hotplug: enable memory hotplug to handle hugepage
      prepare to remove /proc/sys/vm/hugepages_treat_as_movable

 Documentation/sysctl/vm.txt |  13 +----
 include/linux/hugetlb.h     |  15 +++++
 include/linux/mempolicy.h   |   2 +-
 include/linux/migrate.h     |   5 --
 mm/hugetlb.c                | 134 +++++++++++++++++++++++++++++++++++++++-----
 mm/memory-failure.c         |  15 ++++-
 mm/memory.c                 |  17 +++++-
 mm/memory_hotplug.c         |  42 +++++++++++---
 mm/mempolicy.c              |  46 +++++++++++++--
 mm/migrate.c                |  51 ++++++++---------
 mm/page_alloc.c             |  12 ++++
 mm/page_isolation.c         |  14 +++++
 12 files changed, 288 insertions(+), 78 deletions(-)
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