[PATCH v2 0/5] support shmem mTHP collapse

[Baolin Wang <baolin.wang@linux.alibaba.com>]

Hi,

Shmem already supports mTHP allocation[1], and this patch set adds support
for shmem mTHP collapse, as well as adding relevant test cases. Please
help to review. Thanks.

Note: all khugepaged selftests have passed.

[1] https://lore.kernel.org/all/cover.1718090413.git.baolin.wang@linux.alibaba.com/T/#m4bd7e701c7b5f36f712055e4360cad593a22b3bf

Changes from v1:
 - Simplify is_refcount_suitable(), per David.
 - Add reviewed tag from David. Thanks.
 - Update some comments.

Baolin Wang (5):
  mm: khugepaged: expand the is_refcount_suitable() to support file
    folios
  mm: khugepaged: use the number of pages in the folio to check the
    reference count
  mm: khugepaged: support shmem mTHP copy
  mm: khugepaged: support shmem mTHP collapse
  selftests: mm: support shmem mTHP collapse testing

 mm/khugepaged.c                           | 62 +++++++++++------------
 tools/testing/selftests/mm/khugepaged.c   |  4 +-
 tools/testing/selftests/mm/thp_settings.c | 46 ++++++++++++++---
 tools/testing/selftests/mm/thp_settings.h |  9 +++-
 4 files changed, 82 insertions(+), 39 deletions(-)

-- 
2.39.3