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 | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 1023e67..78b2851 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1846,6 +1846,9 @@ static bool __collapse_huge_page_copy(pte_t *pte, struct page *page,
{
pte_t *_pte;
bool mknuma = false;
+#ifdef CONFIG_AUTONUMA
+ int autonuma_last_nid = -1;
+#endif
for (_pte = pte; _pte < pte+HPAGE_PMD_NR; _pte++) {
pte_t pteval = *_pte;
struct page *src_page;
@@ -1855,6 +1858,17 @@ static bool __collapse_huge_page_copy(pte_t *pte, struct page *page,
add_mm_counter(vma->vm_mm, MM_ANONPAGES, 1);
} else {
src_page = pte_page(pteval);
+#ifdef CONFIG_AUTONUMA
+ /* pick the first one, better than nothing */
+ if (autonuma_last_nid < 0) {
+ 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);
release_pte_page(src_page);
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>