From patchwork Fri Feb 19 10:49:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muchun Song X-Patchwork-Id: 12094973 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,URIBL_BLOCKED,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 44EB2C433E6 for ; Fri, 19 Feb 2021 10:54:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E9C9264EBF for ; Fri, 19 Feb 2021 10:53:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230239AbhBSKxq (ORCPT ); Fri, 19 Feb 2021 05:53:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53266 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230196AbhBSKxY (ORCPT ); Fri, 19 Feb 2021 05:53:24 -0500 Received: from mail-pg1-x532.google.com (mail-pg1-x532.google.com [IPv6:2607:f8b0:4864:20::532]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AABBCC06178C for ; Fri, 19 Feb 2021 02:52:20 -0800 (PST) Received: by mail-pg1-x532.google.com with SMTP id b21so3758924pgk.7 for ; Fri, 19 Feb 2021 02:52:20 -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=/z4/inaUQyi6A7ziFBiSuphvc4zlbtBFhhYbLAw/G34=; b=dTHGW2GrZQlpZCCgS5ZGbbONBlwQ67ce+8mCMu/g5KK3ueEVcctzYjxaprsXTtbPGJ Yq9NXwoiKFoDETUkpr+m96ZD2lg7P1WqXsUavgtl2ohvjVdJ9cfbsGBovwDhldFU91Cf +1OUoo4ftVwOJpwt0oWmAc6yldLkuY2HEdz5TGqzKWHCSk3LKNruRlqm4EIdkzbc6xEP 9GZt9M9HlBL16qyEF49t82HbU+nV60t7h5e26EDBC5VhON1kDSQEXXizdaQB154IOWDN piK3eDp6mKC45Z0WnuMNi/vpyTQC7h4JIzSMJvoDIA0InFn+88jIfH/kI11xEyB76OnD nc5w== 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=/z4/inaUQyi6A7ziFBiSuphvc4zlbtBFhhYbLAw/G34=; b=sN2g+JosY6zbxDnfHS1YUtViBEgfu5A02dWg+NvKGQtj1ZlADqSNCI+s30PmNW8/FE B6o8sXZEEvA4e20s7CLAFhiqo/1RqEOURtDzEFvWBGfbMkLWtWz76NRVWfdaH7+V8fPW yarZjOVmx96BmbzRkd4c9cXGzRIgJfyG4/i56blsxG1iAivoSKw+CvkfGbZpGbRxZg5B 9IPKTnN1ZIiVOGo5wicIAE1lguNnk7E2Zg8i0qOLHSZHlU28VVHgyb+H1/3m+66w+gtg 5vWYquNiTmY8AyN409SCZYOfkKbip0i/jH56S6fcDdtGhSoRIxB4ClrAdsmPX88DFdec h5qQ== X-Gm-Message-State: AOAM533F0565Dw2dUvSC1gPsflakxevIjvm+Lz3F4ThAE9Gsw1XUjxc6 iBiYuEXRAnXlUPbUZNEZS56MMw== X-Google-Smtp-Source: ABdhPJwOmS9HqudSELeMjO7sH1YZWGFBDRQ+Usrfu04u4QL8cAeQ4UBBNVPlDp0EZzgLb+Zm8DkQIQ== X-Received: by 2002:a62:8fd4:0:b029:1de:d484:e1f7 with SMTP id n203-20020a628fd40000b02901ded484e1f7mr8781404pfd.78.1613731940261; Fri, 19 Feb 2021 02:52:20 -0800 (PST) Received: from localhost.localdomain ([139.177.225.250]) by smtp.gmail.com with ESMTPSA id x1sm9662193pgj.37.2021.02.19.02.52.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 19 Feb 2021 02:52:19 -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, joao.m.martins@oracle.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 , Miaohe Lin Subject: [PATCH v16 2/9] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Fri, 19 Feb 2021 18:49:47 +0800 Message-Id: <20210219104954.67390-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210219104954.67390-1-songmuchun@bytedance.com> References: <20210219104954.67390-1-songmuchun@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org 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. 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 | 6 ++++++ 2 files changed, 7 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 97e7b77c9309..de87f234f1e9 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -237,6 +237,12 @@ 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 + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS