[PATCH] mm: Change of refcounting method for compound page.

["Radosław Smogura" <mail@smogura.eu>]

Hello,

Currently, I try to enable huge pages for SHM (and generally for any page cache), during
this I ran into problem with ref-countig of huge pages.

Due to this I would like to propose patch for changing ref-counting for compound
page and allowing auto destruction of such page. I tried to revert behavior
from 2.6 kernels, and to make it concurrently safe, as well sophisticated
and compatible with THP.

I hope this removes risky way through call get_user_pages, too.

For me enabling such ref-counting is really important to continue work, and to
prevent huge changes in page cache managing.

Regards,
RadosA?aw Smogura (1):
  mm: Change of refcounting method for compound page.

 include/linux/mm.h       |   94 +++++++++++-----
 include/linux/mm_types.h |   24 ++++-
 include/linux/pagemap.h  |    1 -
 mm/huge_memory.c         |   30 ++---
 mm/internal.h            |   46 --------
 mm/memory.c              |    2 +-
 mm/page_alloc.c          |    2 +
 mm/swap.c                |  272 ++++++++++++++++++++++++++++++----------------
 8 files changed, 279 insertions(+), 192 deletions(-)

-- 
1.7.3.4

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