MADV_FREE support

This patch enable MADV_FREE hint for madvise syscall, which have been supported by other OSes. [PATCH 1] includes the details.

[1] support MADVISE_FREE for !THP page so if VM encounter THP page in syscall context, it splits THP page.
[2-6] is to preparing to call madvise syscall without THP plitting
[7] enable THP page support for MADV_FREE.

* from v16
* Rebased on mmotm-2014-10-15-16-57

* from v15
* Add more Acked-by - Rik van Riel
* Rebased on mmotom-08-29-15-15

* from v14
* Add more Ackedy-by from arch people(sparc, arm64 and arm)
* Drop s390 since pmd_dirty/clean was merged

* from v13
* Add more Ackedy-by from arch people(arm, arm64 and ppc)
* Rebased on mmotm 2014-08-13-14-29

* from v12
* Fix - skip to mark free pte on try_to_free_swap failed page - Kirill
* Add more Acked-by from arch maintainers and Kirill

* From v11
* Fix arm build - Steve
* Separate patch for arm and arm64 - Steve
* Remove unnecessary check - Kirill
* Skip non-vm_normal page - Kirill
* Add Acked-by - Zhang
* Sparc64 build fix
* Pagetable walker THP handling fix

* From v10
* Add Acked-by from arch stuff(x86, s390)
* Pagewalker based pagetable working - Kirill
* Fix try_to_unmap_one broken with hwpoison - Kirill
* Use VM_BUG_ON_PAGE in madvise_free_pmd - Kirill
* Fix pgtable-3level.h for arm - Steve

* From v9
* Add Acked-by - Rik
* Add THP page support - Kirill

* From v8
* Rebased-on v3.16-rc2-mmotm-2014-06-25-16-44

* From v7
* Rebased-on next-20140613

* From v6
* Remove page from swapcache in syscal time
* Move utility functions from memory.c to madvise.c - Johannes
* Rename untilify functtions - Johannes
* Remove unnecessary checks from vmscan.c - Johannes
* Rebased-on v3.15-rc5-mmotm-2014-05-16-16-56
* Drop Reviewe-by because there was some changes since then.

* From v5
* Fix PPC problem which don't flush TLB - Rik
* Remove unnecessary lazyfree_range stub function - Rik
* Rebased on v3.15-rc5

* From v4
* Add Reviewed-by: Zhang Yanfei
* Rebase on v3.15-rc1-mmotm-2014-04-15-16-14

* From v3
* Add "how to work part" in description - Zhang
* Add page_discardable utility function - Zhang
* Clean up

* From v2
* Remove forceful dirty marking of swap-readed page - Johannes
* Remove deactivation logic of lazyfreed page
* Rebased on 3.14
* Remove RFC tag

* From v1
* Use custom page table walker for madvise_free - Johannes
* Remove PG_lazypage flag - Johannes
* Do madvise_dontneed instead of madvise_freein swapless system

Minchan Kim (7):
mm: support madvise(MADV_FREE)
x86: add pmd_[dirty|mkclean] for THP
sparc: add pmd_[dirty|mkclean] for THP
powerpc: add pmd_[dirty|mkclean] for THP
arm: add pmd_mkclean for THP
arm64: add pmd_[dirty|mkclean] for THP
mm: Don't split THP page when syscall is called

 arch/arm/include/asm/pgtable-3level.h    |   1 +
 arch/arm64/include/asm/pgtable.h         |   2 +
 arch/powerpc/include/asm/pgtable-ppc64.h |   2 +
 arch/sparc/include/asm/pgtable_64.h      |  16 ++++
 arch/x86/include/asm/pgtable.h           |  10 ++
 include/linux/huge_mm.h                  |   4 +
 include/linux/rmap.h                     |   9 +-
 include/linux/vm_event_item.h            |   1 +
 include/uapi/asm-generic/mman-common.h   |   1 +
 mm/huge_memory.c                         |  35 +++++++
 mm/madvise.c                             | 159 +++++++++++++++++++++++++++++++
 mm/rmap.c                                |  46 ++++++++-
 mm/vmscan.c                              |  64 +++++++++----
 mm/vmstat.c                              |   1 +
 14 files changed, 331 insertions(+), 20 deletions(-)

2.0.0

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