[PATCHv6 28/36] mm, numa: skip PTE-mapped THP on numa fault

Kirill A. Shutemov
2015-06-03T17:08:12Z

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>
---
mm/memory.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/mm/memory.c b/mm/memory.c
index cdc20d674675..89dae13db3d3 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3179,6 +3179,12 @@ 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
--
2.1.4