[PATCH v2 00/46] Folio-enabling the page cache

[Matthew Wilcox (Oracle)]

These are all the patches I've collected to date which enable filesystems
to be converted to use folios.  After applying these patches (on top of
folio v12), I have an iomap (ie xfs/zonefs) conversion.  I would expect
filesystems to convert one-by-one, rather than converting all callers of
(say) set_page_writeback() to call folio_start_writeback().

The biggest chunk of this is teaching the writeback code that folios may
be larger than a single page, so there's no (or little) code reduction
from these patches.  Instead it takes us to where we can start preparing
filesystems to see multi-page folios.

Matthew Wilcox (Oracle) (46):
  mm: Add folio_to_pfn()
  mm: Add folio_rmapping()
  mm: Add kmap_local_folio()
  mm: Add flush_dcache_folio()
  mm: Add arch_make_folio_accessible()
  mm: Add folio_young() and folio_idle()
  mm/workingset: Convert workingset_activation to take a folio
  mm/swap: Add folio_activate()
  mm/swap: Add folio_mark_accessed()
  mm/rmap: Add folio_mkclean()
  mm/memcg: Remove 'page' parameter to mem_cgroup_charge_statistics()
  mm/memcg: Use the node id in mem_cgroup_update_tree()
  mm/memcg: Convert commit_charge() to take a folio
  mm/memcg: Add folio_charge_cgroup()
  mm/memcg: Add folio_uncharge_cgroup()
  mm/memcg: Add folio_migrate_cgroup()
  mm/memcg: Convert mem_cgroup_track_foreign_dirty_slowpath() to folio
  mm/migrate: Add folio_migrate_mapping()
  mm/migrate: Add folio_migrate_flags()
  mm/migrate: Add folio_migrate_copy()
  mm/writeback: Rename __add_wb_stat() to wb_stat_mod()
  flex_proportions: Allow N events instead of 1
  mm/writeback: Change __wb_writeout_inc() to __wb_writeout_add()
  mm/writeback: Add __folio_end_writeback()
  mm/writeback: Add folio_start_writeback()
  mm/writeback: Add folio_mark_dirty()
  mm/writeback: Add __folio_mark_dirty()
  mm/writeback: Add filemap_dirty_folio()
  mm/writeback: Add folio_account_cleaned()
  mm/writeback: Add folio_cancel_dirty()
  mm/writeback: Add folio_clear_dirty_for_io()
  mm/writeback: Add folio_account_redirty()
  mm/writeback: Add folio_redirty_for_writepage()
  mm/filemap: Add i_blocks_per_folio()
  mm/filemap: Add folio_mkwrite_check_truncate()
  mm/filemap: Add readahead_folio()
  mm/workingset: Convert workingset_refault() to take a folio
  mm: Add folio_evictable()
  mm/lru: Convert __pagevec_lru_add_fn to take a folio
  mm/lru: Add folio_add_lru()
  mm/page_alloc: Add folio allocation functions
  mm/filemap: Add filemap_alloc_folio
  mm/filemap: Add filemap_add_folio
  mm/filemap: Convert mapping_get_entry to return a folio
  mm/filemap: Add filemap_get_folio
  mm/filemap: Add FGP_STABLE

 .../admin-guide/cgroup-v1/memcg_test.rst      |   2 +-
 Documentation/core-api/cachetlb.rst           |   6 +
 arch/nds32/include/asm/cacheflush.h           |   1 +
 fs/jfs/jfs_metapage.c                         |   1 +
 include/asm-generic/cacheflush.h              |   6 +
 include/linux/backing-dev.h                   |   6 +-
 include/linux/flex_proportions.h              |   9 +-
 include/linux/gfp.h                           |  22 +-
 include/linux/highmem-internal.h              |  11 +
 include/linux/highmem.h                       |  38 ++
 include/linux/ksm.h                           |   4 +-
 include/linux/memcontrol.h                    |  28 +-
 include/linux/migrate.h                       |   4 +
 include/linux/mm.h                            |  51 +--
 include/linux/page-flags.h                    |  20 +-
 include/linux/page_idle.h                     |  99 +++--
 include/linux/page_owner.h                    |   8 +-
 include/linux/pagemap.h                       | 195 ++++++---
 include/linux/rmap.h                          |  10 +-
 include/linux/swap.h                          |  10 +-
 include/linux/writeback.h                     |   9 +-
 include/trace/events/writeback.h              |   8 +-
 kernel/bpf/verifier.c                         |   2 +-
 lib/flex_proportions.c                        |  28 +-
 mm/filemap.c                                  | 240 +++++------
 mm/folio-compat.c                             |  98 +++++
 mm/internal.h                                 |  35 +-
 mm/ksm.c                                      |  31 +-
 mm/memcontrol.c                               | 124 +++---
 mm/memory.c                                   |   3 +-
 mm/mempolicy.c                                |  10 +
 mm/migrate.c                                  | 242 +++++------
 mm/page-writeback.c                           | 383 ++++++++++--------
 mm/page_alloc.c                               |  12 +
 mm/page_owner.c                               |  10 +-
 mm/rmap.c                                     |  12 +-
 mm/shmem.c                                    |   5 +-
 mm/swap.c                                     | 137 ++++---
 mm/swap_state.c                               |   2 +-
 mm/util.c                                     |  33 +-
 mm/workingset.c                               |  44 +-
 41 files changed, 1158 insertions(+), 841 deletions(-)

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2.30.2