From patchwork Fri Aug 2 09:34:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yicong Yang X-Patchwork-Id: 13751363 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 9329DC3DA4A for ; Fri, 2 Aug 2024 09:43:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding: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=WRcU+cH9QtSG/X/p9xvkHmpKDIQ+l5WdcVU5f8aCQ2U=; b=xGGfc8MPwaccazRVhqBAUzNvGo yrrh5zfK8CsNObticRj6sTcmimeDoHGDLrenxeoBMk8KPM+e9WSBWIbhFHsQC6UhdYs/gyGp//qBL 3XnHAkNLZ025upW0Dlf+AEQa7VtM/UqLrfwh0Qz8iEXtoZG2UrN8Rz5CkWaFvXgkIFHcm3P5G9fXR dNlkazM3aggLa67B/PK5gV0LPzI+RAu8LyiaHw21COp8pAoqjITJYkl03BwIp9Mc37Vjs/nkPYm35 JEyB5KXnmuUyLZouolmyCQregLEYRjVqzOHYk/pMIJUb6L+M6ao6bykPFRTBAdE6Kw9mhhphVZgvX +pTqF/WQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZooj-00000008KLq-0ViU; Fri, 02 Aug 2024 09:43:21 +0000 Received: from szxga02-in.huawei.com ([45.249.212.188]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZomd-00000008Jdt-2t3X for linux-arm-kernel@lists.infradead.org; Fri, 02 Aug 2024 09:41:13 +0000 Received: from mail.maildlp.com (unknown [172.19.88.194]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4Wb14f0Pf2zfZPd; Fri, 2 Aug 2024 17:39:14 +0800 (CST) Received: from kwepemd200014.china.huawei.com (unknown [7.221.188.8]) by mail.maildlp.com (Postfix) with ESMTPS id 7AF54140132; Fri, 2 Aug 2024 17:41:05 +0800 (CST) Received: from localhost.localdomain (10.50.165.33) by kwepemd200014.china.huawei.com (7.221.188.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.34; Fri, 2 Aug 2024 17:41:04 +0800 From: Yicong Yang To: , , , , CC: , , , , , , , , , Subject: [PATCH 0/2] Support Armv8.9/v9.4 FEAT_HAFT Date: Fri, 2 Aug 2024 17:34:56 +0800 Message-ID: <20240802093458.32683-1-yangyicong@huawei.com> X-Mailer: git-send-email 2.31.0 MIME-Version: 1.0 X-Originating-IP: [10.50.165.33] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemd200014.china.huawei.com (7.221.188.8) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240802_024111_909410_DA379F3F X-CRM114-Status: UNSURE ( 9.48 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Yicong Yang This series adds basic support for FEAT_HAFT introduced in Armv8.9/v9.4 and enable ARCH_HAS_NONLEAF_PMD_YOUNG. The latter will be used in lru-gen aging. Tested with lru-gen in below steps: 1. Generate a 1GiB workingset by `stress-ng --vm 1`. Then hang the task to stop accessing the memory. (AF bit won't be updated) 2. try to age the memory by /sys/kernel/debug/lru_gen Run above steps with LRU_GEN_NONLEAF_YOUNG(0x4) and not respectively (switching by /sys/kernel/mm/lru_gen/enabled). LRU_GEN_NONLEAF_YOUNG will clear and test the PMD AF bit on page walking for aging, otherwise will clear and test the PTE AF bit for aging. In this case LRU_GEN_NONLEAF_YOUNG will improve the efficiency of page scanning since pages won't be accessed and we don't need to scan each PTE. For lru-gen aging: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/mm/multigen_lru.rst?h=v6.11-rc1#n94 Yicong Yang (2): arm64: Add support for FEAT_HAFT arm64: Enable ARCH_HAS_NONLEAF_PMD_YOUNG arch/arm64/Kconfig | 21 ++++++++++++++ arch/arm64/include/asm/pgtable-hwdef.h | 5 ++++ arch/arm64/include/asm/pgtable.h | 14 ++++++++-- arch/arm64/kernel/cpufeature.c | 38 ++++++++++++++++++++++++++ arch/arm64/tools/cpucaps | 1 + arch/arm64/tools/sysreg | 1 + 6 files changed, 78 insertions(+), 2 deletions(-)