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Subject[PATCH 28/35] autonuma: retain page last_nid information in khugepaged
Date
When pages are collapsed try to keep the last_nid information from one
of the original pages.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---
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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