From patchwork Sat Aug 27 09:58:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jisheng Zhang X-Patchwork-Id: 12956959 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 215B3C0502C for ; Sat, 27 Aug 2022 10:07:48 +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: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:In-Reply-To:References: List-Owner; bh=8m/MSYks9Sc4MxjcMNSA3a+KRa7KC2tw/kek+a0mcIw=; b=c/KsLv8EOgt+kp 1epBbr/YEMDpcP5IxPEDvt0lbA9YSieKvk8i47tTGLgU0LZq2fEDhoWHLhY75JS0bLvzpv5osCWKc O6/g2RBF6HE+XynvEfP1JPKuHmTlPGVc6c3h5k9+N/z2h42XDTD0+pbFXZaEtudQ2VInA2BYEL5lt kLW9m2fSKgxP5l/OXVRkUiCTLCnh66rAMHWXkQUtBruWngU7iJXTPWdkrIy/pFd1hGVmW6UVPR/uM XVIrp9c9bQC/2bfka36KlkbjJNAAE0nrVpsWEyYRMRQ6rYklrMKc5KunoaWAIA8zDynrKYbmGMm7d gHPYvtTLYNr1sDQO3pqA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oRsj0-007Sg2-1w; Sat, 27 Aug 2022 10:07:34 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oRsix-007Sdx-43 for linux-riscv@lists.infradead.org; Sat, 27 Aug 2022 10:07:32 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id A13BFB80EDB; Sat, 27 Aug 2022 10:07:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 289F9C433C1; Sat, 27 Aug 2022 10:07:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1661594847; bh=x4/mGVMacC5xRI5YrwqxL+YnyXrMhkteEEVlNDKVYpY=; h=From:To:Cc:Subject:Date:From; b=QOI9LDoNkrsYJpyEwmZKcrb7VofNKKRStmjAR1DER05HCs3v6ckfZNzg3q318UFuE SKQBRURtBtyz4fCp/hOaAv+hyYUWNobgl0V2gMIzP6sfZXMavzq577wFVN469A1kSf vyGS2T9vMoh5ackyGaxk5etTvY4H+X7nwSpX0n2wEnttG1TepJFiP8zoGW92Kltmx8 z7SUEQlGAVBuZQKioaIe17P7HNyJhlSCw3IxE95IDw/7/V+K74b/TGBPBC277LuW8j fVAC6ODypiiZ3bQPKiCiWqNCGxeLRqtAWjKlDQUBkmDOgXIFawQv0AgkNCy0ZckHPX fXak6rJbJvrqA== From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Andrew Jones Subject: [PATCH v2] riscv: enable THP_SWAP for RV64 Date: Sat, 27 Aug 2022 17:58:15 +0800 Message-Id: <20220827095815.698-1-jszhang@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220827_030731_360062_FB2B23BB X-CRM114-Status: UNSURE ( 8.18 ) 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 I have a Sipeed Lichee RV dock board which only has 512MB DDR, so memory optimizations such as swap on zram are helpful. As is seen in commit d0637c505f8a ("arm64: enable THP_SWAP for arm64") and commit bd4c82c22c367e ("mm, THP, swap: delay splitting THP after swapped out"), THP_SWAP can improve the swap throughput significantly. Enable THP_SWAP for RV64, testing the micro-benchmark which is introduced by commit d0637c505f8a ("arm64: enable THP_SWAP for arm64") shows below numbers on the Lichee RV dock board: thp swp throughput w/o patch: 66908 bytes/ms (mean of 10 tests) thp swp throughput w/ patch: 322638 bytes/ms (mean of 10 tests) Improved by 382%! Signed-off-by: Jisheng Zhang Reviewed-by: Andrew Jones Reviewed-by: Conor Dooley --- Since v1: - collect reviewed-by tag - make ARCH_WANTS_THP_SWAP rely on HAVE_ARCH_TRANSPARENT_HUGEPAGE instead arch/riscv/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index ed66c31e4655..79e52441e18b 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -45,6 +45,7 @@ config RISCV select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_GENERAL_HUGETLB select ARCH_WANT_HUGE_PMD_SHARE if 64BIT + select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU select BUILDTIME_TABLE_SORT if MMU select CLONE_BACKWARDS