[PATCH -V3 2/4] hugetlb: Move all the in use pages to active list

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>

When we fail to allocate pages from the reserve pool, hugetlb
do try to allocate huge pages using alloc_buddy_huge_page.
Add these to the active list. We also need to add the huge
page we allocate when we soft offline the oldpage to active
list.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 mm/hugetlb.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c57740b..ec7b86e 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -928,8 +928,14 @@ struct page *alloc_huge_page_node(struct hstate *h, int nid)
 	page = dequeue_huge_page_node(h, nid);
 	spin_unlock(&hugetlb_lock);
 
-	if (!page)
+	if (!page) {
 		page = alloc_buddy_huge_page(h, nid);
+		if (page) {
+			spin_lock(&hugetlb_lock);
+			list_move(&page->lru, &h->hugepage_activelist);
+			spin_unlock(&hugetlb_lock);
+		}
+	}
 
 	return page;
 }
@@ -1155,6 +1161,9 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
 			hugepage_subpool_put_pages(spool, chg);
 			return ERR_PTR(-ENOSPC);
 		}
+		spin_lock(&hugetlb_lock);
+		list_move(&page->lru, &h->hugepage_activelist);
+		spin_unlock(&hugetlb_lock);
 	}
 
 	set_page_private(page, (unsigned long)spool);
-- 
1.7.10

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