From nobody Sun Sep 14 02:06:10 2025 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 73485C54EAA for ; Fri, 27 Jan 2023 05:04:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230433AbjA0FE6 (ORCPT ); Fri, 27 Jan 2023 00:04:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229448AbjA0FE4 (ORCPT ); Fri, 27 Jan 2023 00:04:56 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A5D315CE74 for ; Thu, 26 Jan 2023 21:04:55 -0800 (PST) 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 4AD5FB81F87 for ; Fri, 27 Jan 2023 05:04:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6801C433EF; Fri, 27 Jan 2023 05:04:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1674795893; bh=/HLKprgFCkbwfasw3ymLCwPg8rX60Yypp+3lYT3FCJ4=; h=From:To:Cc:Subject:Date:From; b=Mp/rTFaZrIswP/zPyxJsexO6HD1kJWsmPpq+Dl17E8g8+5vNo28eKn/wnbal/dq+9 ue1W8sWQZARzTxdJxD6tWGlMycrf0stBW/c7G7KK/kcP6+66EeJei/Z9Zi4wMHLoM6 nbjjXIAZo0T+MSGYbJ24kPTSIRpWwwZ3lqEhgQvQfLV9n3Je9q25UJf2/w8NXrWgJz ec7ljPaw+1OEHlYYuOawmSCkTUEeJ8MbV1+hZQmJMBXMrlUqZN0/9hHe7xJMt1/vqP hYlq3slKHiZe3SDP9+qiaDFB969ICKH9rAnBhfUQ+nYmjrK6Up8PxAvs9+9CW+ZgkA VvNYgMm89j8TA== From: guoren@kernel.org To: tongtiangen@huawei.com, alexandre.ghiti@canonical.com, muchun.song@linux.dev, palmer@rivosinc.com, guoren@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Guo Ren , Muchun Song Subject: [PATCH -next V2] riscv: mm: hugetlb: Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP Date: Fri, 27 Jan 2023 00:04:21 -0500 Message-Id: <20230127050421.1920048-1-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 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" From: Guo Ren Add HVO support for RISC-V; see commit 6be24bed9da3 ("mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP"). This patch is similar to commit 1e63ac088f20 ("arm64: mm: hugetlb: enable HUGETLB_PAGE_FREE_VMEMMAP for arm64"), and riscv's motivation is the same as arm64. The current riscv was ready to enable HVO after fixup, ref commit d33deda095d3 ("riscv/mm: hugepage's PG_dcache_clean flag is only set in head page"). The HugeTLB VmemmapvOptimization (HVO) defaults to off in Kconfig. Here is the riscv test log: cat /proc/sys/vm/hugetlb_optimize_vmemmap echo 8 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages mount -t hugetlbfs none test/ -o pagesize=3D2048k Signed-off-by: Guo Ren Signed-off-by: Guo Ren Link: https://lore.kernel.org/linux-riscv/1F5AF29D-708A-483B-A29F-CAEE6F554= 866@linux.dev/ Acked-by: Muchun Song Reviewed-by: Andrew Jones --- Changelog: V2: - Optimize the commit log - Remove riscv page compound_head fixup which has been merged. - Rebase on riscv for-next (20230127) - Add HVO author's acked-by V1: https://lore.kernel.org/linux-riscv/20221023133205.3493564-1-guoren@kernel.= org/ --- arch/riscv/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index e2b656043abf..949974a38a41 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -46,6 +46,7 @@ config RISCV select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_GENERAL_HUGETLB select ARCH_WANT_HUGE_PMD_SHARE if 64BIT + select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP 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 --=20 2.36.1