On Mon 14-11-16 15:07:33, Huang Shijie wrote: > (1) Background > For the arm64, the hugetlb page size can be 32M (PMD + Contiguous bit). > In the 4K page environment, the max page order is 10 (max_order - 1), > so 32M page is the gigantic page. > > The arm64 MMU supports a Contiguous bit which is a hint that the TTE > is one of a set of contiguous entries which can be cached in a single > TLB entry. Please refer to the arm64v8 mannul : > DDI0487A_f_armv8_arm.pdf (in page D4-1811) > > (2) The bug > After I tested the libhugetlbfs, I found the test case "counter.sh" > will fail with the gigantic page (32M page in arm64 board). > > This patch set adds support for gigantic surplus hugetlb pages, > allowing the counter.sh unit test to pass. Andrew, I have noticed that this patchset is sitting in the mmotm tree already. I have to say I am not really happy about the changes it is introducing. It is making a confused code base even more so. I have already commented on respective patches but in general I think it needs a deeper thought before it can be merged. -- Michal Hocko SUSE Labs -- 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>