[PATCH v2 01/20] mm, hugetlb: protect reserved pages when soft offlining a hugepage
From: Joonsoo Kim <hidden>
Date: 2013-08-09 09:27:14
Also in:
lkml
Subsystem:
hugetlb subsystem, memory management, the rest · Maintainers:
Muchun Song, Oscar Salvador, Andrew Morton, Linus Torvalds
Don't use the reserve pool when soft offlining a hugepage. Check we have free pages outside the reserve pool before we dequeue the huge page. Otherwise, we can steal other's reserve page. Reviewed-by: Aneesh Kumar <redacted> Signed-off-by: Joonsoo Kim <redacted>
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 6782b41..d971233 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c@@ -935,10 +935,11 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid) */ struct page *alloc_huge_page_node(struct hstate *h, int nid) { - struct page *page; + struct page *page = NULL; spin_lock(&hugetlb_lock); - page = dequeue_huge_page_node(h, nid); + if (h->free_huge_pages - h->resv_huge_pages > 0) + page = dequeue_huge_page_node(h, nid); spin_unlock(&hugetlb_lock); if (!page)
--
1.7.9.5
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