From patchwork Thu Jan 25 14:59:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jisheng Zhang X-Patchwork-Id: 13531072 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 7AD93C47258 for ; Thu, 25 Jan 2024 15:12:06 +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=dVMO6wv0B+sTnkppuekDLKYYKkS/ILwS7tY+Ii5YBEs=; b=rCZjLSDBvXMwjN nK5GvfWfUEOuXqqeWfaWjIt+QciiQkN5gxOSwo3at0wK3ltGvJe1IRLJ25PWW+BLdHphRydZlcqZu mFrSipk0wIVWQXa0D7BIqf4FyrCHB0vUzx9Vdyd4F+r6nIM6UM3LDCcgD7XRcz5ckSLPNUOm1BWNl msPLwF/vIikN8yKwcaBXY3PvC3DdoyhEL6eHGEHmS4nqkF/6xM8lIAXbdMOUnUpYHkvftiscXMLHj mEcptq9iUTxpO8CgiG83q1/2wrFxDaIUQr8chGJ5RCGt5mT1qaTBEzlEPUVPl2gR0msXoEq0fhIcF TcV+8lA6iR/A9XPZiaog==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rT1Ob-00000000YeF-42Rk; Thu, 25 Jan 2024 15:12:01 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rT1OZ-00000000YcT-17Wl for linux-riscv@lists.infradead.org; Thu, 25 Jan 2024 15:12:00 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id B635161365; Thu, 25 Jan 2024 15:11:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FBD0C43390; Thu, 25 Jan 2024 15:11:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706195518; bh=qaC0W89Ij+l6ejUX971u7DsedKgRmIMuV9AHu7Mxo8U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nSXdWtBRn7k/oWkIm7gkawOUKqSN1OL4w9QeB24Fl8ZRHsLgAjoCIHhFWXd79Mp/k 3Ywru/xCQb2wY60k7l+yyuii5qOHoNUPxJY9OA4fDUB9tsBI4CKKLva81H4c5Npxko soBi2N+5Uw7UwkYTWpLpjdPKPQ0wBM3LM74JmxAgiScgs4je9bRGpVKtSOL7XfqcrF qK+tHIU3yLfbf+4jshsQqPu95ovDWv9J+0QvFX4IW5ZFrIZ/pWLLCKym8nubIjGZDb ItQ+fc24J9ME0sCIyGDYtuTdbnutgAEV9mcG2Qrx1ywShbrYa9g7szY7BW8Otb0SZs axAz+H2EwRvfA== 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 1/2] riscv: select ARCH_USE_CMPXCHG_LOCKREF Date: Thu, 25 Jan 2024 22:59:06 +0800 Message-ID: <20240125145908.968-2-jszhang@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240125145908.968-1-jszhang@kernel.org> References: <20240125145908.968-1-jszhang@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240125_071159_424707_52DCE62C X-CRM114-Status: UNSURE ( 7.16 ) 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 fdd1a595ebd8..248cea3e2749 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -51,6 +51,7 @@ 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