linux-kernel - [PATCH 4/4] riscv: enable HAVE_FAST

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Date: Wed, 20 Dec 2023 01:50:46 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Will Deacon <will@...nel.org>,
	"Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...il.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 4/4] riscv: enable HAVE_FAST_GUP if MMU

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@...nel.org>
---
 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