| From | "Aneesh Kumar K.V" <> | Subject | Re: [PATCHv4 00/24] THP refcounting redesign | Date | Tue, 17 Mar 2015 15:12:05 +0530 |
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"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.
I tested this patch on ppc64 and verified thp allocation and split. I also checked the subpage_prot and it worked as expected. I will run more tests with this series and update if I find any issues.
-aneesh
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