From: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> commit ed1523a895ffdabcab6e067af18685ed00f5ce15 upstream. The huge_ptep_set_access_flags() can not make the huge pte old according to the discussion [1], that means we will always mornitor the young state of the hugetlb though we stopped accessing the hugetlb, as a result DAMON will get inaccurate accessing statistics. So changing to use set_huge_pte_at() to make the huge pte old to fix this issue. [1] https://lore.kernel.org/all/Yqy97gXI4Nqb7dYo@xxxxxxx/ Link: https://lkml.kernel.org/r/1655692482-28797-1-git-send-email-baolin.wang@xxxxxxxxxxxxxxxxx Fixes: 49f4203aae06 ("mm/damon: add access checking for hugetlb pages") Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> Reviewed-by: SeongJae Park <sj@xxxxxxxxxx> Acked-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/damon/vaddr.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -407,8 +407,7 @@ static void damon_hugetlb_mkold(pte_t *p if (pte_young(entry)) { referenced = true; entry = pte_mkold(entry); - huge_ptep_set_access_flags(vma, addr, pte, entry, - vma->vm_flags & VM_WRITE); + set_huge_pte_at(mm, addr, pte, entry); } #ifdef CONFIG_MMU_NOTIFIER
