On Fri, 6 Aug 2021, Zi Yan wrote: > > In addition, I would like to share more detail on my plan on supporting 1GB PUD THP. > This patchset is the first step, enabling kernel to allocate 1GB pages, so that > user can get 1GB THPs from ZONE_NORMAL and ZONE_MOVABLE without using > alloc_contig_pages() or CMA allocator. The next step is to improve kernel memory > fragmentation handling for pages up to MAX_ORDER, since currently pageblock size > is still limited by memory section size. As a result, I will explore solutions > like having additional larger pageblocks (up to MAX_ORDER) to counter memory > fragmentation. I will discover what else needs to be solved as I gradually improve > 1GB PUD THP support. Sorry to be blunt, but let me state my opinion: 2MB THPs have given and continue to give us more than enough trouble. Complicating the kernel's mm further, just to allow 1GB THPs, seems a very bad tradeoff to me. I understand that it's an appealing personal project; but for the sake of of all the rest of us, please leave 1GB huge pages to hugetlbfs (until the day when we are all using 2MB base pages). Hugh
