[PATCH v2 0/7] mm/hmm/nouveau: add THP migration to migrate_vma_*

[Ralph Campbell]

This series adds support for transparent huge page migration to
migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers.
An earlier version was posted previously [1]. This version now
supports splitting a THP midway in the migration process which
led to a number of changes.

The patches apply cleanly to the current linux-mm tree. Since there
are a couple of patches in linux-mm from Dan Williams that modify
lib/test_hmm.c and drivers/gpu/drm/nouveau/nouveau_dmem.c, it might
be easiest if Andrew could take these through the linux-mm tree
assuming that's OK with other maintainers like Ben Skeggs.

[1] https://lore.kernel.org/linux-mm/20200619215649.32297-1-rcampbell@xxxxxxxxxx

Ralph Campbell (7):
  mm/thp: fix __split_huge_pmd_locked() for migration PMD
  mm/migrate: move migrate_vma_collect_skip()
  mm: support THP migration to device private memory
  mm/thp: add prep_transhuge_device_private_page()
  mm/thp: add THP allocation helper
  mm/hmm/test: add self tests for THP migration
  nouveau: support THP migration to private memory

 drivers/gpu/drm/nouveau/nouveau_dmem.c | 289 +++++++++++-----
 drivers/gpu/drm/nouveau/nouveau_svm.c  |  11 +-
 drivers/gpu/drm/nouveau/nouveau_svm.h  |   3 +-
 include/linux/gfp.h                    |  10 +
 include/linux/huge_mm.h                |  12 +
 include/linux/memremap.h               |   9 +
 include/linux/migrate.h                |   2 +
 lib/test_hmm.c                         | 439 +++++++++++++++++++++----
 lib/test_hmm_uapi.h                    |   3 +
 mm/huge_memory.c                       | 177 +++++++---
 mm/memory.c                            |  10 +-
 mm/migrate.c                           | 429 +++++++++++++++++++-----
 mm/rmap.c                              |   2 +-
 tools/testing/selftests/vm/hmm-tests.c | 404 +++++++++++++++++++++++
 14 files changed, 1519 insertions(+), 281 deletions(-)

-- 
2.20.1