# \[PATCH v6 11/11\] powerpc/mm: Enable HAVE\_MOVE\_PMD support

- From: Aneesh Kumar K.V \<hidden\>
- Date: 2021-05-24 09:02:26 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2021/05/6508392
- Thread: https://ratatoskr.run/linux-mm/2021/05/6508382/t.md

```text
mremap HAVE_MOVE_PMD/PUD optimization time comparison for 1GB region:
1GB mremap - Source PTE-aligned, Destination PTE-aligned
  mremap time:      1122062ns
1GB mremap - Source PMD-aligned, Destination PMD-aligned
  mremap time:       522062ns
1GB mremap - Source PUD-aligned, Destination PUD-aligned
  mremap time:       523345ns

There is not much impact with HAVE_MOVE_PUD because the kernel by default
enables USE_SPLIT_PTE_PTLOCKS. That results in the optimized pud move being
disabled.

Signed-off-by: Aneesh Kumar K.V <redacted>
---
 arch/powerpc/platforms/Kconfig.cputype | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 3ce907523b1e..2e666e569fdf 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -97,6 +97,8 @@ config PPC_BOOK3S_64
 	select PPC_HAVE_PMU_SUPPORT
 	select SYS_SUPPORTS_HUGETLBFS
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
+	select HAVE_MOVE_PMD
+	select HAVE_MOVE_PUD
 	select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
 	select ARCH_SUPPORTS_NUMA_BALANCING
 	select IRQ_WORK
-- 
2.31.1

```