[PATCH 28/35] autonuma: retain page last_nid information in khugepaged

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When pages are collapsed try to keep the last_nid information from one
of the original pages.

Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
 mm/huge_memory.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index d388517..76bdc48 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1805,7 +1805,18 @@ static bool __collapse_huge_page_copy(pte_t *pte, struct page *page,
 			clear_user_highpage(page, address);
 			add_mm_counter(vma->vm_mm, MM_ANONPAGES, 1);
 		} else {
+#ifdef CONFIG_AUTONUMA
+			int autonuma_last_nid;
+#endif
 			src_page = pte_page(pteval);
+#ifdef CONFIG_AUTONUMA
+			/* pick the last one, better than nothing */
+			autonuma_last_nid =
+				ACCESS_ONCE(src_page->autonuma_last_nid);
+			if (autonuma_last_nid >= 0)
+				ACCESS_ONCE(page->autonuma_last_nid) =
+					autonuma_last_nid;
+#endif
 			copy_user_highpage(page, src_page, address, vma);
 			VM_BUG_ON(page_mapcount(src_page) != 1);
 			VM_BUG_ON(page_count(src_page) != 2);

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