From nobody Fri Dec 19 12:28:21 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C394739AE7; Tue, 19 Dec 2023 18:03:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BvEJaO/t" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 01013C433CC; Tue, 19 Dec 2023 18:03:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1703009013; bh=jOzh15UGY8/GeKyvzomEjUoOApjigEX2YDPvhINsBhY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BvEJaO/t7fLRI9ME+g6Nf2uKvBFzhDxeGVkHtu0GNM/cuRLsGbH1Dn5794sKOGhX7 t2neLuWSxp8mcJ6f0iqpeVhqi4qYZ8ahPfVqN2Da62LUO4i/t7gL4bmvdBqH64Llyn QkRpi8dmIk/b/s2jltgElLVpM3vEGAMoladx4fbNv3xbFj5qlDKciiWQ+lStLf8ju1 pub/Wz86s+HQWQ3Ve18yw7Zyy0EcvOkhR8zgpWpEnigIMCNNdI7HcIC4rkQ9U2GhTK L7bquPxY+IC1hy+VduUcpRaujnplUMl8dZNy79gV5MHb1aIEYQXoOGfUkVwIpLYaME gcTZZsxBtN4Pg== From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Will Deacon , "Aneesh Kumar K . V" , Andrew Morton , Nick Piggin , Peter Zijlstra Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 4/4] riscv: enable HAVE_FAST_GUP if MMU Date: Wed, 20 Dec 2023 01:50:46 +0800 Message-Id: <20231219175046.2496-5-jszhang@kernel.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20231219175046.2496-1-jszhang@kernel.org> References: <20231219175046.2496-1-jszhang@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Alexandre Ghiti --- 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/pgta= ble.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)); } =20 +#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)); --=20 2.40.0