[PATCH -next v3 00/19] mm: convert page cpupid functions to folios

[Kefeng Wang]

The cpupid(or access time) used by numa balancing is stored in flags
or _last_cpupid(if LAST_CPUPID_NOT_IN_PAGE_FLAGS) of page, this is to
convert page cpupid to folio cpupid, a new _last_cpupid is added into
folio, which make us to use folio->_last_cpupid directly, and the
page cpupid functions are converted to folio ones.

  page_cpupid_last()		-> folio_last_cpupid()
  xchg_page_access_time()	-> folio_xchg_access_time()
  page_cpupid_xchg_last()	-> folio_xchg_last_cpupid()

v3:
- fix finish_mkwrite_fault built warning reported-by lkp
- address the wp_page_reuse() comment of Matthew, also update
  changelog of change_pte_range() and wp_page_reuse() a bit
- rebased on next-20231018

v2:
- add virtual into folio too
- re-write and split patches to make them easier to review
- rename to folio_last_cpupid/folio_xchg_last_cpupid/folio_xchg_access_time
- rebased on next-20231013

v1:
- drop inappropriate page_cpupid_reset_last conversion from RFC
- rebased on next-20231009

Kefeng Wang (19):
  mm_types: add virtual and _last_cpupid into struct folio
  mm: add folio_last_cpupid()
  mm: memory: use folio_last_cpupid() in do_numa_page()
  mm: huge_memory: use folio_last_cpupid() in do_huge_pmd_numa_page()
  mm: huge_memory: use folio_last_cpupid() in __split_huge_page_tail()
  mm: remove page_cpupid_last()
  mm: add folio_xchg_access_time()
  sched/fair: use folio_xchg_access_time() in numa_hint_fault_latency()
  mm: mprotect: use a folio in change_pte_range()
  mm: huge_memory: use a folio in change_huge_pmd()
  mm: remove xchg_page_access_time()
  mm: add folio_xchg_last_cpupid()
  sched/fair: use folio_xchg_last_cpupid() in
    should_numa_migrate_memory()
  mm: migrate: use folio_xchg_last_cpupid() in folio_migrate_flags()
  mm: huge_memory: use folio_xchg_last_cpupid() in
    __split_huge_page_tail()
  mm: make finish_mkwrite_fault() static
  mm: convert wp_page_reuse() and finish_mkwrite_fault() to take a folio
  mm: use folio_xchg_last_cpupid() in wp_page_reuse()
  mm: remove page_cpupid_xchg_last()

 include/linux/mm.h       | 30 +++++++++++++++---------------
 include/linux/mm_types.h | 22 ++++++++++++++++++----
 kernel/sched/fair.c      |  4 ++--
 mm/huge_memory.c         | 17 +++++++++--------
 mm/memory.c              | 38 ++++++++++++++++++++------------------
 mm/migrate.c             |  8 ++++----
 mm/mmzone.c              |  6 +++---
 mm/mprotect.c            | 16 +++++++++-------
 8 files changed, 80 insertions(+), 61 deletions(-)

-- 
2.27.0