On 09/13/22 12:54, Doug Berger wrote:
> When demoting a hugepage to a smaller order, the number of pages
> added to the target hstate will be the size of the large page
> divided by the size of the smaller page.
>
> Fixes: 8531fc6f52f5 ("hugetlb: add hugetlb demote page support")
> Signed-off-by: Doug Berger <opendmb@xxxxxxxxx>
> ---
> mm/hugetlb.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index e070b8593b37..79949893ac12 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3472,7 +3472,8 @@ static int demote_free_huge_page(struct hstate *h, struct page *page)
> * based on pool changes for the demoted page.
> */
> h->max_huge_pages--;
> - target_hstate->max_huge_pages += pages_per_huge_page(h);
> + target_hstate->max_huge_pages += pages_per_huge_page(h) /
> + pages_per_huge_page(target_hstate);
>
> return rc;
> }
This has already been fixed here,
https://lore.kernel.org/linux-mm/20220823030209.57434-2-linmiaohe@xxxxxxxxxx/
--
Mike Kravetz
