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> >> > > > > Hi Mike, what is the expected behavior, if a user tries to use move_pages() > >> > > > > to migrate a non head page of a hugetlb page? > >> > > > > >> > > > Could you give some advise, thanks > >> > > > > >> > > > >> > > Sorry, I was away for a while. > >> > > > >> > > It seems unfortunate that move_pages says the passed user addresses > >> > > should be aligned to page boundaries. However, IIUC this is not checked > >> > > or enforced. Otherwise, passing a hugetlb page should return the same > >> > > error. > >> > > > >> > > One thought would be that hugetlb mappings should behave the same > >> > > non-hugetlb mappings. If passed the address of a hugetlb tail page, align > >> > > the address to a hugetlb boundary and migrate the page. This changes the > >> > > existing behavior. However, it would be hard to imagine anyone depending > >> > > on this. > >> > > > >> > > After taking a closer look at the add_page_for_migration(), it seems to > >> > > just ignore passed tail pages and do nothing for such passed addresses. > >> > > Correct? Or, am I missing something? Perhaps that is behavior we want/ > >> > > need to preserve? > >> > > >> > My mistake, status -EACCES is returned when passing a tail page of a > >> > hugetlb page. > >> > > >> > >> As mentioned in previous mail， before e66f17ff7177 ("mm/hugetlb: take > >> page table lock in follow_huge_pmd()") in v4.0, follow_page() will > >> return NULL on tail page for Huagetlb page, so move_pages() will return > >> -ENOENT errno, but after that commit, -EACCES is returned. > >> > >> Meanwhile, the behavior of THP/HUGETLB is different, the whole THP will be > >> migrated on a tail page, but HUGETLB will return -EACCES(after v4.0) > >> or -ENOENT(before v4.0) on tail page. > >> > >> > Back to the question of 'What is the expected behavior if a tail page is > >> > passed?'. I do not think we have defined an expected behavior. If > >> > anything is 'expected' I would say it is -EACCES as returned today. > >> > > >> > >> My question is, > >> > >> Should we keep seem behavior between HUGETLB and THP, or only change the > >> errno from -EACCES to -ENOENT/-EBUSY. > > > > Just to be clear. When you say "keep seem behavior between HUGETLB and THP", > > are you saying that you would like hugetlb to perform migration of the entire > > hugetlb page if a tail page is passed? > > > > IMO, this would be ideal as it would mean that hugetlb and THP behave the same > > when passed the address of a tail page. The fewer places where hugetlb > > behavior diverges, the better. However, this does change behavior. > > A separate patch will be needed for behavior change. > Correct. Since the goal of this series is to convert to folios, we should maintain the existing behavior and errno (-EACCES). In a subsequent patch, we can change behavior. That would be my suggestion. -- Mike Kravetz