[PATCHv2, RFC 00/30] Transparent huge page cache

[Kirill A. Shutemov]

From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>

Here's the second version of the patchset.

The intend of the work is get code ready to enable transparent huge page
cache for the most simple fs -- ramfs.

We have read()/write()/mmap() functionality now. Still plenty work ahead.

Any feedback is welcome.

Changes since v1:
 - mmap();
 - fix add_to_page_cache_locked() and delete_from_page_cache();
 - introduce mapping_can_have_hugepages();
 - call split_huge_page() only for head page in filemap_fault();
 - wait_split_huge_page(): serialize over i_mmap_mutex too;
 - lru_add_page_tail: avoid PageUnevictable on active/inactive lru lists;
 - fix off-by-one in zero_huge_user_segment();
 - THP_WRITE_ALLOC/THP_WRITE_FAILED counters;

TODO:
 - memcg accounting has not yet evaluated;
 - collapse;
 - migration (?);
 - stats, knobs, etc.;
 - tmpfs/shmem enabling;


Kirill A. Shutemov (30):
  block: implement add_bdi_stat()
  mm: implement zero_huge_user_segment and friends
  mm: drop actor argument of do_generic_file_read()
  radix-tree: implement preload for multiple contiguous elements
  thp, mm: avoid PageUnevictable on active/inactive lru lists
  thp, mm: basic defines for transparent huge page cache
  thp, mm: introduce mapping_can_have_hugepages() predicate
  thp, mm: rewrite add_to_page_cache_locked() to support huge pages
  thp, mm: rewrite delete_from_page_cache() to support huge pages
  thp, mm: locking tail page is a bug
  thp, mm: handle tail pages in page_cache_get_speculative()
  thp, mm: add event counters for huge page alloc on write to a file
  thp, mm: implement grab_cache_huge_page_write_begin()
  thp, mm: naive support of thp in generic read/write routines
  thp, libfs: initial support of thp in
    simple_read/write_begin/write_end
  thp: handle file pages in split_huge_page()
  thp: wait_split_huge_page(): serialize over i_mmap_mutex too
  thp, mm: truncate support for transparent huge page cache
  thp, mm: split huge page on mmap file page
  ramfs: enable transparent huge page cache
  x86-64, mm: proper alignment mappings with hugepages
  mm: add huge_fault() callback to vm_operations_struct
  thp: prepare zap_huge_pmd() to uncharge file pages
  thp: move maybe_pmd_mkwrite() out of mk_huge_pmd()
  thp, mm: basic huge_fault implementation for generic_file_vm_ops
  thp: extract fallback path from do_huge_pmd_anonymous_page() to a
    function
  thp: initial implementation of do_huge_linear_fault()
  thp: handle write-protect exception to file-backed huge pages
  thp: call __vma_adjust_trans_huge() for file-backed VMA
  thp: map file-backed huge pages on fault

 arch/x86/kernel/sys_x86_64.c  |   13 +-
 fs/libfs.c                    |   50 ++++-
 fs/ramfs/inode.c              |    6 +-
 include/linux/backing-dev.h   |   10 +
 include/linux/huge_mm.h       |   36 +++-
 include/linux/mm.h            |   16 ++
 include/linux/pagemap.h       |   24 ++-
 include/linux/radix-tree.h    |    3 +
 include/linux/vm_event_item.h |    2 +
 lib/radix-tree.c              |   32 ++-
 mm/filemap.c                  |  283 +++++++++++++++++++++----
 mm/huge_memory.c              |  462 ++++++++++++++++++++++++++++++++++-------
 mm/memory.c                   |   31 ++-
 mm/swap.c                     |    3 +-
 mm/truncate.c                 |   12 ++
 mm/vmstat.c                   |    2 +
 16 files changed, 842 insertions(+), 143 deletions(-)

-- 
1.7.10.4

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