[PATCH v5 00/12] MADV_FREE support

[Minchan Kim <minchan@kernel.org>]

In v4, Andrew wanted to settle in old basic MADV_FREE and introduces
new stuffs(ie, lazyfree LRU, swapless support and lazyfreeness) later
so this version doesn't include them.

I have been tested it on mmotm-2015-11-25-17-08 with additional
patch[1] from Kirill to prevent BUG_ON which he didn't send to
linux-mm yet as formal patch. With it, I couldn't find any
problem so far.

Note that this version is based on THP refcount redesign so
I needed some modification on MADV_FREE because split_huge_pmd
doesn't split a THP page any more and pmd_trans_huge(pmd) is not
enough to guarantee the page is not THP page.
As well, for MAVD_FREE lazy-split, THP split should respect
pmd's dirtiness rather than marking ptes of all subpages dirty
unconditionally. Please, review last patch in this patchset.

	mm: don't split THP page when syscall is called

[1] https://lkml.org/lkml/2015/11/17/134

git: git://git.kernel.org/pub/scm/linux/kernel/git/minchan/linux.git
branch: mm/madv_free-v4.4-rc2-mmotm-2015-11-25-17-08-v5r2

In this stage, I don't think we need to write man page.
It could be done after solid policy and implementation.

 * Change from v4
   * drop lazyfree LRU
   * drop swapless support
   * drop lazyfreeness
   * rebase on recent mmotom with THP refcount redesign

 * Change from v3
   * some bug fix
   * code refactoring
   * lazyfree reclaim logic change
   * reordering patch

 * Change from v2
   * vm_lazyfreeness tuning knob
   * add new LRU list - Johannes, Shaohua
   * support swapless - Johannes

 * Change from v1
   * Don't do unnecessary TLB flush - Shaohua
   * Added Acked-by - Hugh, Michal
   * Merge deactivate_page and deactivate_file_page
   * Add pmd_dirty/pmd_mkclean patches for several arches
   * Add lazy THP split patch
   * Drop zhangyanfei@cn.fujitsu.com - Delivery Failure

Chen Gang (1):
  arch: uapi: asm: mman.h: Let MADV_FREE have same value for all
    architectures

Minchan Kim (11):
  mm: support madvise(MADV_FREE)
  mm: define MADV_FREE for some arches
  mm: free swp_entry in madvise_free
  mm: move lazily freed pages to inactive list
  mm: mark stable page dirty in KSM
  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_mkclean for THP
  mm: don't split THP page when syscall is called

 arch/alpha/include/uapi/asm/mman.h       |   2 +
 arch/arm/include/asm/pgtable-3level.h    |   1 +
 arch/arm64/include/asm/pgtable.h         |   1 +
 arch/mips/include/uapi/asm/mman.h        |   2 +
 arch/parisc/include/uapi/asm/mman.h      |   2 +
 arch/powerpc/include/asm/pgtable-ppc64.h |   2 +
 arch/sparc/include/asm/pgtable_64.h      |   9 ++
 arch/x86/include/asm/pgtable.h           |   5 +
 arch/xtensa/include/uapi/asm/mman.h      |   2 +
 include/linux/huge_mm.h                  |   3 +
 include/linux/rmap.h                     |   1 +
 include/linux/swap.h                     |   1 +
 include/linux/vm_event_item.h            |   1 +
 include/uapi/asm-generic/mman-common.h   |   1 +
 mm/huge_memory.c                         |  87 +++++++++++++-
 mm/ksm.c                                 |   6 +
 mm/madvise.c                             | 199 +++++++++++++++++++++++++++++++
 mm/rmap.c                                |   8 ++
 mm/swap.c                                |  44 +++++++
 mm/swap_state.c                          |   5 +-
 mm/vmscan.c                              |  10 +-
 mm/vmstat.c                              |   1 +
 22 files changed, 383 insertions(+), 10 deletions(-)

-- 
1.9.1

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