Activate the fast gup for riscv mmu platforms. Here are some
GUP_FAST_BENCHMARK performance numbers:
Before the patch:
GUP_FAST_BENCHMARK: Time: get:53203 put:5085 us
After the patch:
GUP_FAST_BENCHMARK: Time: get:17711 put:5060 us
The get time is reduced by 66.7%! IOW, 3x get speed!
Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
---
arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/pgtable.h | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index d3555173d9f4..04df9920282d 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -119,6 +119,7 @@ config RISCV
select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
select HAVE_EBPF_JIT if MMU
+ select HAVE_FAST_GUP if MMU
select HAVE_FUNCTION_ARG_ACCESS_API
select HAVE_FUNCTION_ERROR_INJECTION
select HAVE_GCC_PLUGINS
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index ab00235b018f..c6eb214139e6 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -673,6 +673,12 @@ static inline int pmd_write(pmd_t pmd)
return pte_write(pmd_pte(pmd));
}
+#define pud_write pud_write
+static inline int pud_write(pud_t pud)
+{
+ return pte_write(pud_pte(pud));
+}
+
static inline int pmd_dirty(pmd_t pmd)
{
return pte_dirty(pmd_pte(pmd));
--
2.40.0
