f/madivse(DONTNEED) support

Recently there is a report about working set page eviction due to rsync
workload. application programmers want to use fadvise but it's not easy.
You could see detailed description on [1/3].

 - [1/3] is to move invalidated page which is dirty/writeback on active list
   into inactive list's head.
 - [2/3] is for moving invalidated page into inactive list's tail when the
   page's writeout is completed.
 - [3/3] is to not calling mark_page_accessed in case of madvise(DONTNEED).

Minchan Kim (3):
  deactivate invalidated pages
  Reclaim invalidated page ASAP
  Prevent activation of page in madvise_dontneed

 include/linux/mm.h   |    4 +-
 include/linux/swap.h |    1 +
 mm/madvise.c         |    4 +-
 mm/memory.c          |   38 +++++++++++-------
 mm/mmap.c            |    4 +-
 mm/page-writeback.c  |   12 +++++-
 mm/swap.c            |  102 ++++++++++++++++++++++++++++++++++++++++++++++++++
 mm/truncate.c        |   16 ++++++--
 8 files changed, 155 insertions(+), 26 deletions(-)

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