On Fri, 24 Apr 2015 00:03:35 +0300 "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > Hello everybody, > > Here's reworked version of my patchset. All known issues were addressed. > > 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. Are there any measurable performance improvements? > 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 reviewers look on this code before-and-after to > justify time budget on reviewing this patchset. > > ... > > 59 files changed, 1144 insertions(+), 1509 deletions(-) It's huge. I'm going to need help reviewing this. Have earlier versions been reviewed much? Who do you believe are suitable reviewers? -- 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>