Convert more migrate functions to use a folio, it is also a preparation
for large folio migration support when numa balance.
The patch 1~2 remove unexpected specific assert for PageTransHuge page.
The Patch 3~6 convert several more migration functions to use folio.
1) add_page_for_migration() used by move_pages
2) migrate_misplaced_page()/numamigrate_isolate_page()
used by numa balance
The patch 7 remove PageHead() check to make hugetlb to migrate the
entire hugetlb page instead of -EACCES errno return when
passed the address of a tail page.
The patch 8 cleanup to unify and simplify code a bit in
add_page_for_migration()
Thanks for all comments and suggestions from Matthew, Hugh, Zi, Mike, Huang.
v3:
- update changelog of patch1
- use folio_estimated_sharers and comment it in migrate_misplaced_folio()
- collect RB/ACK
- rebased on 6.6-rc1
v2:
- keep page_mapcount() check and remove specific assert for
PageTransHuge page.
- separate patch7 to migrate the entire hugetlb page if a tail page passed,
which unified the behavior between HUGETLB and THP when move_page().
Kefeng Wang (8):
mm: migrate: remove PageTransHuge check in numamigrate_isolate_page()
mm: migrate: remove THP mapcount check in numamigrate_isolate_page()
mm: migrate: convert numamigrate_isolate_page() to
numamigrate_isolate_folio()
mm: migrate: convert migrate_misplaced_page() to
migrate_misplaced_folio()
mm: migrate: use __folio_test_movable()
mm: migrate: use a folio in add_page_for_migration()
mm: migrate: remove PageHead() check for HugeTLB in
add_page_for_migration()
mm: migrate: remove isolated variable in add_page_for_migration()
include/linux/migrate.h | 4 +-
mm/huge_memory.c | 2 +-
mm/memory.c | 2 +-
mm/migrate.c | 126 ++++++++++++++++++----------------------
4 files changed, 62 insertions(+), 72 deletions(-)
--
2.27.0
