On Thu, Feb 25, 2021 at 09:21:26PM +0800, Muchun Song wrote: > Because we reuse the first tail vmemmap page frame and remap it > with read-only, we cannot set the PageHWPosion on some tail pages. > So we can use the head[4].private (There are at least 128 struct > page structures associated with the optimized HugeTLB page, so > using head[4].private is safe) to record the real error page index > and set the raw error page PageHWPoison later. > Does the hardcoding of 4 come from HUGETLB_CGROUP_MIN_ORDER, if so do we need to hardcode 4? Also, I am not sure about the comment on safety and 128 struct pages Balbir
