"Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxx> -aneesh -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>