From patchwork Mon Mar 25 11:10:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jisheng Zhang X-Patchwork-Id: 13601953 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 965D9C54E64 for ; Mon, 25 Mar 2024 11:24:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=i2KcqGPmfE9URusB02/gu8sxx3PqV56gZv50rptimyI=; b=PRkiF7P0mdJP6D LspF/4WKIJkWSCOnPyL0sqfcM7yz4IOVpSt27Iepa/yNNpxMrRV8QTTuFiBqHNmg/KCf5InVeFAWA 5xBVBwDIfl+b2uN7Eg8E2LWQiPA0Ll85xGmNEMS06r0QkN+dtXqXM70b4jVYT/zlT7DB3/nsurlH9 /DVe6tzpRhRos5lvmZYOYqm+Ek6eOyQG6ptdC2XHIgHX/A/Yz6WjO2xjXCK974CWgAC7Uax0jk/DS 2aUXxQL+fdX6vbbOH4RvP66OmzyBmDWp8AaLEsnNas9Zs9wzSTBhTXjQjrQAsVQTQF2Xhz3zvQjm9 Egj8nfHununHnD4Qt7GA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1roiQx-0000000H1tO-0ToK; Mon, 25 Mar 2024 11:24:07 +0000 Received: from sin.source.kernel.org ([145.40.73.55]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1roiQo-0000000H1qX-2F2X for linux-riscv@lists.infradead.org; Mon, 25 Mar 2024 11:24:01 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id DAA02CE1723; Mon, 25 Mar 2024 11:23:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6D14AC433F1; Mon, 25 Mar 2024 11:23:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711365836; bh=TkQFAl0y/SHZ/rPLxSlv1JjtbvVld+zmq7CDJ3afisw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WDstMSAUtMz3dbEcVm+KLj1GR9k7r52hnpVzlF2STimuRRvPFMDaOrFV7Ov/86urM zkXfEq9MVCWVOD9OWWqn7Drl8ilkELX/EqjZG6TzDk7LfjGKaAs+wfBGaUDX3u2v5i KeSkxzv2cEv+9KJbpqxro/uYf9da5AiVxCu71SIB86Fx2MsLQI3kZDailyNKwl1VIl BT++7eVE+OcTA6uRxlJuy3a5oLyc8cTSBl6kJ0AEkSYOp4+4pkwrdvzfJgv9eGXoQ3 1HCQ4zA7BRYic/5jofv/E1MRs15h7yHC0sJZZdCB1JdpRT4JkkZZJ2FWTZzQRLlsES 41Wunpx0FrcUg== From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Andrea Parri Subject: [PATCH v3 RESEND 1/2] riscv: select ARCH_USE_CMPXCHG_LOCKREF Date: Mon, 25 Mar 2024 19:10:37 +0800 Message-ID: <20240325111038.1700-2-jszhang@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240325111038.1700-1-jszhang@kernel.org> References: <20240325111038.1700-1-jszhang@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240325_042358_806009_ECC1CE8E X-CRM114-Status: UNSURE ( 7.44 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Select ARCH_USE_CMPXCHG_LOCKREF to enable the cmpxchg-based lockless lockref implementation for riscv. Using Linus' test case[1] on TH1520 platform, I see a 11.2% improvement. On JH7110 platform, I see 12.0% improvement. Link: http://marc.info/?l=linux-fsdevel&m=137782380714721&w=4 [1] Signed-off-by: Jisheng Zhang Reviewed-by: Andrea Parri --- arch/riscv/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index aba42b2bf660..7895c77545f1 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -58,6 +58,7 @@ config RISCV select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU select ARCH_SUPPORTS_PER_VMA_LOCK if MMU select ARCH_SUPPORTS_SHADOW_CALL_STACK if HAVE_SHADOW_CALL_STACK + select ARCH_USE_CMPXCHG_LOCKREF if 64BIT select ARCH_USE_MEMTEST select ARCH_USE_QUEUED_RWLOCKS select ARCH_USES_CFI_TRAPS if CFI_CLANG