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