Add pseudo-anonymous huge page mappings

This patch set adds a flag to mmap that allows the user to request a mapping to be backed with huge pages. This mapping will borrow functionality from the huge page shm code to create a file on the kernel internal mount and uses it to approximate an anonymous mapping. The MAP_LARGEPAGE flag is a modifier to MAP_ANONYMOUS and will not work without both flags being preset.

A new flag is necessary because there is no other way to hook into huge pages without creating a file on a hugetlbfs mount which wouldn't be MAP_ANONYMOUS.

To userspace, this mapping will behave just like an anonymous mapping because the file is not accessible outside of the kernel.

Eric B Munson (3):
hugetlbfs: Allow the creation of files suitable for MAP_PRIVATE on
the vfs internal mount
Add MAP_LARGEPAGE for mmaping pseudo-anonymous huge page regions Add MAP_LARGEPAGE example to vm/hugetlbpage.txt

 Documentation/vm/hugetlbpage.txt  |   80 +++++++++++++++++++++++++++++++++++++
 fs/hugetlbfs/inode.c              |   22 ++++++++--
 include/asm-generic/mman-common.h |    1 +
 include/linux/hugetlb.h           |   17 +++++++-
 ipc/shm.c                         |    3 +-
 mm/mmap.c                         |   16 +++++++
 6 files changed, 133 insertions(+), 6 deletions(-)

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