On Tue 24-10-17 09:41:46, C.Wehrmeyer wrote: [...] > 1. Provide mmap with some sort of flag (which would be redundant IMHO) in > order to churn out properly aligned pages (not transparent, but the current > MAP_HUGETLB flag isn't either). You can easily implement such a thing in userspace. In fact glibc has already done that for you. > 2. Based on THP enabling status always churn out properly aligned pages, and > just failsafe to smaller pages if hugepages couldn't be allocated (truly > transparent). > 3. Map in memory, then tell madvise to make as many hugepages out of it as > possible while still keeping the initial mapping (not transparent, and not > sure Linux can actually do that). I think there is still some confusion here. Kernel will try to fault in THP pages on properly aligned addresses. So if you create a larger mapping than the THP size then you will get a THP (assuming the memory is not fragmented). It is just the unaligned addresses will get regular pages. -- 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>
