Working on moving some mapcount related checks -- especially folio_likely_mapped_shared() invocations -- under the PTL, where we are sure the folio will remain mapped and the consequently the values are actually expressive in current MM context, there are not that many problematic bits to sort out. This series tackles the NUMA hinting fault handling: we now perform checks and folio isolation under PTL with the nice side effect that we have to take less temporary folio references. Did a quick test on a 2 socket system, NUMA hinting+migration on PTEs and PMDs seems to continue working as expected. Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> David Hildenbrand (2): mm/migrate: make migrate_misplaced_folio() return 0 on success mm/migrate: move NUMA hinting fault folio isolation + checks under PTL include/linux/migrate.h | 7 ++++ mm/huge_memory.c | 13 ++++--- mm/memory.c | 11 +++--- mm/migrate.c | 81 +++++++++++++++++++---------------------- 4 files changed, 58 insertions(+), 54 deletions(-) base-commit: a53138cdbe3ea8875405e96fa9cde64e24f4f9e1 -- 2.45.2
