On Tue, 13 May 2014, Vlastimil Babka wrote: > I wonder what about a process doing e.g. mmap() with MAP_POPULATE. It seems to > me that it would get only MIGRATE_ASYNC here, right? Since gfp_mask would > include __GFP_NO_KSWAPD and it won't have PF_KTHREAD. > I think that goes against the idea that with MAP_POPULATE you say you are > willing to wait to have everything in place before you actually use the > memory. So I guess you are also willing to wait for hugepages in that > situation? > I don't understand the distinction you're making between MAP_POPULATE and simply a prefault of the anon memory. What is the difference in semantics between using MAP_POPULATE and touching a byte every page size along the range? In the latter, you'd be faulting thp with MIGRATE_ASYNC, so I don't understand how MAP_POPULATE is any different or implies any preference for hugepages. -- 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>