hugetlb: move all the in use pages to active list

When we fail to allocate pages from the reserve pool, hugetlb tries 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>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c57740b..ec7b86e 100644 (file)
--- 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);