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For example, on x86 a 1GB huge page can be demoted into 512 2M huge pages. Demotion is done 'in place' by simply splitting the huge page. Signed-off-by: Mike Kravetz --- mm/hugetlb.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 58 insertions(+), 3 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 0c29b7d0d469..33b0d8778551 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2744,17 +2744,72 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid, return 0; } +static int demote_free_huge_page(struct hstate *h, struct page *page) +{ + int i, nid = page_to_nid(page); + struct hstate *target_hstate; + bool cma_page = HPageCma(page); + + target_hstate = size_to_hstate(PAGE_SIZE << h->demote_order); + + ClearHPageFreed(page); + list_del(&page->lru); + h->free_huge_pages--; + h->free_huge_pages_node[nid]--; + h->nr_huge_pages--; + h->nr_huge_pages_node[nid]--; + set_page_refcounted(page); + set_compound_page_dtor(page, NULL_COMPOUND_DTOR); + spin_unlock(&hugetlb_lock); + + /* + * Note for future: + * When support for reducing vmemmap of huge pages is added, we + * will need to allocate vmemmap pages here and could fail. + */ + destroy_compound_gigantic_page(page, huge_page_order(h)); + + for (i = 0; i < pages_per_huge_page(h); + i += pages_per_huge_page(target_hstate)) { + /* + * Explicitly use prep_compound_gigantic_page if demoting + * a page allocated from CMA so that TAIL_MAPPING is not + * set in tail pages. The CMA code does not expect this. + */ + if (cma_page) + prep_compound_gigantic_page(page + i, + target_hstate->order); + else + prep_compound_huge_page(page + i, target_hstate->order); + prep_new_huge_page(target_hstate, page + i, nid); + if (cma_page) + SetHPageCma(page + i); + put_page(page + i); + } + + spin_lock(&hugetlb_lock); + return 0; +} + static int demote_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed) { + int nr_nodes, node; + struct page *page; int rc = 0; /* If no demote order, free to buddy */ if (!h->demote_order) return free_pool_huge_page(h, nodes_allowed, 0); - /* - * TODO - demote fucntionality will be added in subsequent patch - */ + for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) { + if (!list_empty(&h->hugepage_freelists[node])) { + page = list_entry(h->hugepage_freelists[node].next, + struct page, lru); + rc = !demote_free_huge_page(h, page); + break; + } + } + return rc; } -- 2.29.2