On Fri, 22 Jun 2018 11:51:30 +0800 "Huang, Ying" <ying.huang@xxxxxxxxx> wrote: > This is the final step of THP (Transparent Huge Page) swap > optimization. After the first and second step, the splitting huge > page is delayed from almost the first step of swapout to after swapout > has been finished. In this step, we avoid splitting THP for swapout > and swapout/swapin the THP in one piece. It's a tremendously good performance improvement. It's also a tremendously large patchset :( And it depends upon your mm-swap-fix-race-between-swapoff-and-some-swap-operations.patch and mm-fix-race-between-swapoff-and-mincore.patch, the first of which has been floating about since February without adequate review. I'll give this patchset a spin in -mm to see what happens and will come back later to take a closer look. But the best I can do at this time is to hopefully cc some possible reviewers :)
