1 files changed, 7 insertions, 0 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 9898eeb9a21c..823720c43ea9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3584,6 +3584,13 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
         if (!pte_write(pte))
                 flags |= TNF_NO_GROUP;
 
+        /*
+         * Flag if the page is shared between multiple address spaces. This
+         * is later used when determining whether to group tasks together
+         */
+        if (page_mapcount(page) > 1 && (vma->vm_flags & VM_SHARED))
+                flags |= TNF_SHARED;
+
         last_cpupid = page_cpupid_last(page);
         page_nid = page_to_nid(page);
         target_nid = numa_migrate_prep(page, vma, addr, page_nid);