[RFC PATCH 0/3] Add mmap(MAP_CONTIG) support

[Mike Kravetz <mike.kravetz@oracle.com>]

The following is a 'possible' way to add such functionality.  I just
did what was easy and pre-allocated contiguous pages which are used
to populate the mapping.  I did not use any of the higher order
allocators such as alloc_contig_range.  Therefore, it is limited to
allocations of MAX_ORDER size.  Also, the allocations should probably
be done outside mmap_sem but that was the easiest place to do it in
this quick and easy POC.

I just wanted to throw out some code to get further ideas.  It is far
from complete.

Mike Kravetz (3):
  mm/map_contig: Add VM_CONTIG flag to vma struct
  mm/map_contig: Use pre-allocated pages for VM_CONTIG mappings
  mm/map_contig: Add mmap(MAP_CONTIG) support

 include/linux/mm.h              |  1 +
 include/uapi/asm-generic/mman.h |  1 +
 kernel/fork.c                   |  2 +-
 mm/memory.c                     | 13 +++++-
 mm/mmap.c                       | 94 +++++++++++++++++++++++++++++++++++++++++
 5 files changed, 109 insertions(+), 2 deletions(-)

-- 
2.13.6

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