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Re: [PATCH 00/36] THP refcounting redesign

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"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> writes:

> Hello everybody,
>
> The THP refcounting has been rebased onto current since-4.1 as requested.
>
> The goal of patchset is to make refcounting on THP pages cheaper with
> simpler semantics and allow the same THP compound page to be mapped with
> PMD and PTEs. This is required to get reasonable THP-pagecache
> implementation.
>
> With the new refcounting design it's much easier to protect against
> split_huge_page(): simple reference on a page will make you the deal.
> It makes gup_fast() implementation simpler and doesn't require
> special-case in futex code to handle tail THP pages.
>
> It should improve THP utilization over the system since splitting THP in
> one process doesn't necessary lead to splitting the page in all other
> processes have the page mapped.
>
> The patchset drastically lower complexity of get_page()/put_page()
> codepaths. I encourage people look on this code before-and-after to
> justify time budget on reviewing this patchset.
>

Tested this series of ppc64. Please feel free to add to the series

Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

-aneesh

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[PATCH 00/36] THP refcounting redesign "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 19:50 +0200
  [PATCH 04/36] mm, thp: adjust conditions when we can reuse the page on WP fault "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 19:50 +0200
  [PATCH 14/36] futex, thp: remove special case for THP in get_futex_key "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 19:50 +0200
  [PATCH 13/36] mm: drop tail page refcounting "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 19:50 +0200
  [PATCH 28/36] mm, numa: skip PTE-mapped THP on numa fault "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 19:50 +0200
  [PATCH 19/36] mips, thp: remove infrastructure for handling splitting PMDs "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 19:50 +0200
  [PATCH 32/36] thp: reintroduce split_huge_page() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 19:50 +0200
  [PATCH 10/36] mm, vmstats: new THP splitting event "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 19:50 +0200
  [PATCH 23/36] tile, thp: remove infrastructure for handling splitting PMDs "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 20:00 +0200
  [PATCH 15/36] ksm: prepare to new THP semantics "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 20:00 +0200
  [PATCH 17/36] arm64, thp: remove infrastructure for handling splitting PMDs "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-10 20:00 +0200
  Re: [PATCH 00/36] THP refcounting redesign Jerome Marchand <jmarchan@redhat.com> - 2015-07-14 11:10 +0200
    Re: [PATCH 00/36] THP refcounting redesign "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2015-07-14 17:40 +0200
  Re: [PATCH 00/36] THP refcounting redesign "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2015-07-15 13:40 +0200

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