This patchset tries to support mTHP numa balancing, as a simple solution
to start, the NUMA balancing algorithm for mTHP will follow the THP strategy
as the basic support. Please find details in each patch.

Changes from v2:
 - Add reviewed tag from Huang, Ying.
 - Reuse numa_rebuild_single_mapping() to remove duplicate code per Kefeng Wang.
 - Remove an unnecessary vma_wants_manual_pte_write_upgrad() per Huang, Ying.

Changes from v1:
 - Fix the issue where the end address might exceed the range of the
folio size, suggested by Huang, Ying.
 - Simplify the folio validation.
 - Add pte_modify() before checking pte writable.
 - Update the performance data.

Changes from RFC v2:
 - Follow the THP algorithm per Huang, Ying.

Changes from RFC v1:
 - Add some preformance data per Huang, Ying.
 - Allow mTHP scanning per David Hildenbrand.
 - Avoid sharing mapping for numa balancing to avoid false sharing.
 - Add more commit message.

Baolin Wang (2):
  mm: factor out the numa mapping rebuilding into a new helper
  mm: support multi-size THP numa balancing

 mm/memory.c   | 76 +++++++++++++++++++++++++++++++++++++++++----------
 mm/mprotect.c |  3 +-
 2 files changed, 63 insertions(+), 16 deletions(-)

-- 
2.39.3