Huge page support for DAX

From: Matthew Wilcox <willy@linux.intel.com>

This patchset, on top of the v11 DAX patchset I posted recently, adds
support for transparent huge pages.  In-memory databases and HPC apps are
particularly fond of using huge pages for their massive data sets.

The actual DAX code here is not how I want it to be, for example it
will allocate on read-faults instead of using zero pages to fill until
we have a write fault (which is going to prove tricky without at least
some of Kirill's patches for supporting huge pages in the page cache).

I'm posting this for review now since I clearly don't understand the
Linux MM very well and I'm expecting to be told I've done all the huge
memory bits wrongly :-)

I'd like to thank Kirill for all his helpful suggestions ... I may not
have taken all of them, but this would be in a lot worse shape without
him.

The first patch is from Kirill's patchset to allow huge pages in the
page cache.  Patches 2-4 are the ones that touch the MM and I'd really
like reviewed.  Patch 5 is the DAX code that is easily critiqued, and
patches 6 & 7 are very boring, just hooking up the dax-hugepage code to
ext2 & ext4.

Kirill A. Shutemov (1):
  thp: vma_adjust_trans_huge(): adjust file-backed VMA too

Matthew Wilcox (6):
  mm: Prepare for DAX huge pages
  mm: Add vm_insert_pfn_pmd()
  mm: Add a pmd_fault handler
  dax: Add huge page fault support
  ext2: Huge page fault support
  ext4: Huge page fault support

 Documentation/filesystems/dax.txt |   7 +-
 arch/x86/include/asm/pgtable.h    |  10 +++
 fs/dax.c                          | 133 ++++++++++++++++++++++++++++++++++++++
 fs/ext2/file.c                    |   9 ++-
 fs/ext4/file.c                    |   9 ++-
 include/linux/fs.h                |   2 +
 include/linux/huge_mm.h           |  11 +---
 include/linux/mm.h                |   4 ++
 mm/huge_memory.c                  |  53 +++++++++------
 mm/memory.c                       |  63 ++++++++++++++++--
 10 files changed, 262 insertions(+), 39 deletions(-)

-- 
2.1.0

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