[PATCH v15 0/7] MADV_FREE support

[Minchan Kim]

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 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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