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Subject[PATCHv10 28/36] mm, numa: skip PTE-mapped THP on numa fault
Date
We're going to have THP mapped with PTEs. It will confuse numabalancing.
Let's skip them for now.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
---
mm/memory.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/mm/memory.c b/mm/memory.c
index e42de24690af..5a9e9399d935 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3184,6 +3184,12 @@ static int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
return 0;
}

+ /* TODO: handle PTE-mapped THP */
+ if (PageCompound(page)) {
+ pte_unmap_unlock(ptep, ptl);
+ return 0;
+ }
+
/*
* Avoid grouping on RO pages in general. RO pages shouldn't hurt as
* much anyway since they can be in shared cache state. This misses
--
2.5.0


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