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Date: Mon, 31 Aug 2020 10:23:51 +0800 From: Wei Yang <richard.weiyang@...ux.alibaba.com> To: mike.kravetz@...cle.com, akpm@...ux-foundation.org Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, bhe@...hat.com, Wei Yang <richard.weiyang@...ux.alibaba.com> Subject: [Patch v3 7/7] mm/hugetlb: take the free hpage during the iteration directly Function dequeue_huge_page_node_exact() iterates the free list and return the first valid free hpage. Instead of break and check the loop variant, we could return in the loop directly. This could reduce some redundant check. Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com> --- mm/hugetlb.c | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 7b3357c1dcec..709be7ab65af 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1040,21 +1040,17 @@ static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid) if (nocma && is_migrate_cma_page(page)) continue; - if (!PageHWPoison(page)) + if (PageHWPoison(page)) break; + + list_move(&page->lru, &h->hugepage_activelist); + set_page_refcounted(page); + h->free_huge_pages--; + h->free_huge_pages_node[nid]--; + return page; } - /* - * if 'non-isolated free hugepage' not found on the list, - * the allocation fails. - */ - if (&h->hugepage_freelists[nid] == &page->lru) - return NULL; - list_move(&page->lru, &h->hugepage_activelist); - set_page_refcounted(page); - h->free_huge_pages--; - h->free_huge_pages_node[nid]--; - return page; + return NULL; } static struct page *dequeue_huge_page_nodemask(struct hstate *h, gfp_t gfp_mask, int nid, -- 2.20.1 (Apple Git-117)
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