[PATCH 04/50] mm: numa: Do not account for a hinting fault if we raced

[Mel Gorman]

If another task handled a hinting fault in parallel then do not double
account for it.

Not-signed-off-by: Peter Zijlstra
---
 mm/huge_memory.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 860a368..5c37cd2 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1337,8 +1337,11 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 
 check_same:
 	spin_lock(&mm->page_table_lock);
-	if (unlikely(!pmd_same(pmd, *pmdp)))
+	if (unlikely(!pmd_same(pmd, *pmdp))) {
+		/* Someone else took our fault */
+		current_nid = -1;
 		goto out_unlock;
+	}
 clear_pmdnuma:
 	pmd = pmd_mknonnuma(pmd);
 	set_pmd_at(mm, haddr, pmdp, pmd);
-- 
1.8.1.4

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