From patchwork Sun Jan 17 15:10:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muchun Song X-Patchwork-Id: 12025471 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19F55C433E0 for ; Sun, 17 Jan 2021 15:15:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E5EB72070E for ; Sun, 17 Jan 2021 15:15:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729223AbhAQPPE (ORCPT ); Sun, 17 Jan 2021 10:15:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37928 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729224AbhAQPOU (ORCPT ); Sun, 17 Jan 2021 10:14:20 -0500 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 44736C0613ED for ; Sun, 17 Jan 2021 07:13:25 -0800 (PST) Received: by mail-pf1-x429.google.com with SMTP id b3so8687263pft.3 for ; Sun, 17 Jan 2021 07:13:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ntojA21L7AWHHQRUBdhZHwBioWXg1bVrcDP2ArBhkkY=; b=Ea92toZH/1l0FNhx1nYmpPDeMydz/IKBkjQNccA4JqlaQPi/3Hu7gQ+VMm6zzsAlvz AEPxfJbUcsBRQ/K72F17e5DJy+XSBlPDcFg+yOHm9bZCaxpwuGmq7436uQ3VgxPB6b7F BcGJ7sVKe1WKZbF34ZFO80YezkJaRfz1IlIUL5QduSqo7EI5ifnDybPjYy6FMoMCs0TN DbWgBtJnx8ZU04vNOUTtdXotGgWbbzZRb5jIVaoukR8rnv6/p/9+pwVgJNNKulSFr1/a hcA8Lxw1XnfXxzP0tExT7KFk9sqmACYVhZRtBblbQ8fe0Qcczny3sVq4hnxCmxdSO3+/ PP+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ntojA21L7AWHHQRUBdhZHwBioWXg1bVrcDP2ArBhkkY=; b=cP84rPq4kmoxTDjU8OIt1aH5ZT8/ZlfOmGnacJgIVUlBT3YFE+CgXCRFDalY/ymRAY vKnOaI3+FU7sPc7p0y2K8z8+uICBe1dx8DLNf+7cNhSZ4wOIIeJx0T6I7NkqufrTAAtg wOE4Uy3o1rKBCfX0iyh5AxqyrorW9Fktr2Y/BDa/OwGcapEN3Ax6BMOJSogZ/LU2XxKf kjNlt6/0SAW1+CnFklCPZUVzdud5qB7jQE4jqe+GxMvJ2Z4iFqP0YVcis+RxesYn/ptn epFR4jkO5FBppTnl5IVN2zyX4ozNviDbIOh6KrlVOrsS3Yqf20hvJqLRomqUE/6qDjI2 dsiw== X-Gm-Message-State: AOAM5306m9na+Ap6cfbj/di7zZ8Go5PH4PdUaA4pTXKcIl7+CBOYayQS KVhX3F2vHdRVpbcsrj+pg9mgqw== X-Google-Smtp-Source: ABdhPJylD4KONe3SPQrZ2L10bXdihiwZcjTG3YitmaxUO2lbiyLsg5iYrSq+a5GgBs8/6xFFDzNMFQ== X-Received: by 2002:a63:a804:: with SMTP id o4mr6213615pgf.67.1610896404686; Sun, 17 Jan 2021 07:13:24 -0800 (PST) Received: from localhost.bytedance.net ([139.177.225.247]) by smtp.gmail.com with ESMTPSA id i22sm9247915pjv.35.2021.01.17.07.13.07 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 17 Jan 2021 07:13:24 -0800 (PST) From: Muchun Song To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com, willy@infradead.org, osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com, david@redhat.com, naoya.horiguchi@nec.com Cc: duanxiongchun@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Muchun Song Subject: [PATCH v13 02/12] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Sun, 17 Jan 2021 23:10:43 +0800 Message-Id: <20210117151053.24600-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210117151053.24600-1-songmuchun@bytedance.com> References: <20210117151053.24600-1-songmuchun@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org The HUGETLB_PAGE_FREE_VMEMMAP option is used to enable the freeing of unnecessary vmemmap associated with HugeTLB pages. The config option is introduced early so that supporting code can be written to depend on the option. The initial version of the code only provides support for x86-64. Like other code which frees vmemmap, this config option depends on HAVE_BOOTMEM_INFO_NODE. The routine register_page_bootmem_info() is used to register bootmem info. Therefore, make sure register_page_bootmem_info is enabled if HUGETLB_PAGE_FREE_VMEMMAP is defined. Signed-off-by: Muchun Song Reviewed-by: Oscar Salvador Acked-by: Mike Kravetz Reviewed-by: Miaohe Lin --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 0a45f062826e..0435bee2e172 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1225,7 +1225,7 @@ static struct kcore_list kcore_vsyscall; static void __init register_page_bootmem_info(void) { -#ifdef CONFIG_NUMA +#if defined(CONFIG_NUMA) || defined(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP) int i; for_each_online_node(i) diff --git a/fs/Kconfig b/fs/Kconfig index 976e8b9033c4..e7c4c2a79311 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -245,6 +245,24 @@ config HUGETLBFS config HUGETLB_PAGE def_bool HUGETLBFS +config HUGETLB_PAGE_FREE_VMEMMAP + def_bool HUGETLB_PAGE + depends on X86_64 + depends on SPARSEMEM_VMEMMAP + depends on HAVE_BOOTMEM_INFO_NODE + help + The option HUGETLB_PAGE_FREE_VMEMMAP allows for the freeing of + some vmemmap pages associated with pre-allocated HugeTLB pages. + For example, on X86_64 6 vmemmap pages of size 4KB each can be + saved for each 2MB HugeTLB page. 4094 vmemmap pages of size 4KB + each can be saved for each 1GB HugeTLB page. + + When a HugeTLB page is allocated or freed, the vmemmap array + representing the range associated with the page will need to be + remapped. When a page is allocated, vmemmap pages are freed + after remapping. When a page is freed, previously discarded + vmemmap pages must be allocated before remapping. + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS