From nobody Tue Apr 7 13:29:07 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6142EECAAD2 for ; Sat, 27 Aug 2022 10:07:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232557AbiH0KHf (ORCPT ); Sat, 27 Aug 2022 06:07:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230176AbiH0KHa (ORCPT ); Sat, 27 Aug 2022 06:07:30 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1BC8B4331C for ; Sat, 27 Aug 2022 03:07:30 -0700 (PDT) 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 A6250B81D45 for ; 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 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 --=20 2.34.1