| Date | Wed, 1 Apr 2015 16:26:42 +0300 | From | "Kirill A. Shutemov" <> | Subject | Re: [PATCHv4 00/24] THP refcounting redesign |
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On Mon, Mar 30, 2015 at 09:10:41PM +0530, Aneesh Kumar K.V wrote: > "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> writes: > > > Hello everybody, > > > > It's bug-fix update of my thp refcounting work. > > > > 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. > > Can we split this series into two. The compound_lock removal and using > migration entries ro freeze page count can be made into a seperate > series ?
I would problaby move these patchse to the end of patchset. So they can be applied separately.
-- Kirill A. Shutemov
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