[00/28] Get rid of tail page fields

Message

Matthew Wilcox Jan. 11, 2023, 2:28 p.m. UTC

Continue the shrinkage of the struct page definition by getting rid of
the 'first tail page' and 'second tail page' fields.  I originally did
this patch set before Hugh's rewrite of the subpages_mapcount, so it
needed substantial updates; hope I didn't miss anything.

I hope you like the new names for compound_mapcount and subpages_mapcount.
Rebased on next-20230111.  I also added Sidhartha's patch on the end to
save him the inconvenience of resending it after this patchset lands.

Matthew Wilcox (Oracle) (27):
  mm: Remove folio_pincount_ptr() and head_compound_pincount()
  mm: Convert head_subpages_mapcount() into folio_nr_pages_mapped()
  doc: Clarify refcount section by referring to folios & pages
  mm: Convert total_compound_mapcount() to folio_total_mapcount()
  mm: Convert page_remove_rmap() to use a folio internally
  mm: Convert page_add_anon_rmap() to use a folio internally
  mm: Convert page_add_file_rmap() to use a folio internally
  mm: Add folio_add_new_anon_rmap()
  page_alloc: Use folio fields directly
  mm: Use a folio in hugepage_add_anon_rmap() and
    hugepage_add_new_anon_rmap()
  mm: Use entire_mapcount in __page_dup_rmap()
  mm/debug: Remove call to head_compound_mapcount()
  hugetlb: Remove uses of folio_mapcount_ptr
  mm: Convert page_mapcount() to use folio_entire_mapcount()
  mm: Remove head_compound_mapcount() and _ptr functions
  mm: Reimplement compound_order()
  mm: Reimplement compound_nr()
  mm: Convert set_compound_page_dtor() and set_compound_order() to
    folios
  mm: Convert is_transparent_hugepage() to use a folio
  mm: Convert destroy_large_folio() to use folio_dtor
  hugetlb: Remove uses of compound_dtor and compound_nr
  mm: Remove 'First tail page' members from struct page
  doc: Correct struct folio kernel-doc
  mm: Move page->deferred_list to folio->_deferred_list
  mm/huge_memory: Remove page_deferred_list()
  mm/huge_memory: Convert get_deferred_split_queue() to take a folio
  mm: Convert deferred_split_huge_page() to deferred_split_folio()

Sidhartha Kumar (1):
  mm: remove the hugetlb field from struct page

 Documentation/core-api/pin_user_pages.rst |  29 ++--
 Documentation/mm/transhuge.rst            |  24 ++--
 include/linux/huge_mm.h                   |  13 +-
 include/linux/mm.h                        | 139 ++++++++----------
 include/linux/mm_types.h                  |  87 +++--------
 include/linux/rmap.h                      |  11 +-
 kernel/crash_core.c                       |   4 +-
 mm/debug.c                                |   8 +-
 mm/folio-compat.c                         |   8 ++
 mm/gup.c                                  |   8 +-
 mm/huge_memory.c                          |  97 ++++++-------
 mm/hugetlb.c                              |  24 ++--
 mm/internal.h                             |  18 +++
 mm/page_alloc.c                           |  23 +--
 mm/rmap.c                                 | 167 +++++++++++-----------
 15 files changed, 308 insertions(+), 352 deletions(-)