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Subject[PATCH 04/63] mm: numa: Do not account for a hinting fault if we raced
Date
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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