From patchwork Mon Mar 15 09:20:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muchun Song X-Patchwork-Id: 12138779 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 DEFA7C433E9 for ; Mon, 15 Mar 2021 09:27:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A70D164E31 for ; Mon, 15 Mar 2021 09:27:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229505AbhCOJ07 (ORCPT ); Mon, 15 Mar 2021 05:26:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42190 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229725AbhCOJ0a (ORCPT ); Mon, 15 Mar 2021 05:26:30 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C9AEBC061763 for ; Mon, 15 Mar 2021 02:26:29 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id cl21-20020a17090af695b02900c61ac0f0e9so1663200pjb.1 for ; Mon, 15 Mar 2021 02:26:29 -0700 (PDT) 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=9nTlzKqZFlWsUkZKn9oi/q21qUxZ65s/6xhXufEmb7c=; b=hWchwabdiuGTEDXT0RnHQWVCfKgdpTINIQpgIKJMmpUxPnLs5KZZWlLhwMQs66cy8L LaR47BUkauAlgULv7eOKGQzVhsCy0zcTAkS8egki6tUcz2QXlkB4iCbgPXQuHLxjqEKI HRf6kSRTnRdWGuli1mtWCGlDQE3BK2OdB/1yi0ovyl057cJSy0SSxf+POp8oqK7KHPTE CpsW46i7z1ECXMeDlmI27PGQ0uWMwKTdFMI1HRepf3DcEUZU2RAy24fKY7gFPyJMpSbM DzU/4uNtkANw5b7ry04Qg+pG5kOh++XJLJUuEc62zug6EAUGSwevWKoCN4VO+cv9tGRb IHJA== 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=9nTlzKqZFlWsUkZKn9oi/q21qUxZ65s/6xhXufEmb7c=; b=djUUUyRPmiJ4yNYqf4FPli6E72NaTyKEqRyo729Fz2IlfctC9RWQTzpq9sNE2z857F 8d8waxgrZz8gyTLKwbiQjW6Dnd3eNGxxkz2Iknp7BB4O1JJ+3M0DS7njli4VaCmAK5u8 vbmZ1VSRL/jQSA/yip8kYf/s29ABbcz0uoTDbhXt5ZJq3NZXb23NA6QBQiWpdJmADO+s MIAacS2Pl4ILKocPhVXWaUz/aADeieUm7WLzRrwRjGh8Nh+lnn33CtE4S1SumGqDmzUh TLYOC0DCFydb2H5+OHbnPTnto0KwWxa5EE0tYILmFbDDlB0pYNd7+dqozQO0a7POvpOL YvRg== X-Gm-Message-State: AOAM531tHCcxil3fnMreasfG6Ev2ceMsEo4R+ClfURmcy6AYvDP735Eu tvJFKZEsPeLkEVQXYsaTbplSFA== X-Google-Smtp-Source: ABdhPJwXeYdwuYouTL7HqzYPkbaPF1vJwuTSZ8pT828C8BJTHKy/RHocXTIASW6rfNXVbC0YSqFHIA== X-Received: by 2002:a17:90b:fd2:: with SMTP id gd18mr11805276pjb.115.1615800389353; Mon, 15 Mar 2021 02:26:29 -0700 (PDT) Received: from localhost.localdomain ([139.177.225.231]) by smtp.gmail.com with ESMTPSA id gm10sm10607883pjb.4.2021.03.15.02.26.18 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 15 Mar 2021 02:26:29 -0700 (PDT) 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 , Chen Huang , Bodeddula Balasubramaniam , Balbir Singh Subject: [PATCH v19 2/8] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Mon, 15 Mar 2021 17:20:09 +0800 Message-Id: <20210315092015.35396-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210315092015.35396-1-songmuchun@bytedance.com> References: <20210315092015.35396-1-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. If config HAVE_BOOTMEM_INFO_NODE is enabled, the freeing vmemmap page code denpend on it to free vmemmap pages. Otherwise, just use free_reserved_page() to free vmemmmap pages. 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 Tested-by: Chen Huang Tested-by: Bodeddula Balasubramaniam Reviewed-by: Balbir Singh --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 5 +++++ 2 files changed, 6 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 eccbcf1e3f2e..46fef1f721c0 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -237,6 +237,11 @@ 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 + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS