From patchwork Thu Feb 25 13:21:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muchun Song X-Patchwork-Id: 12104097 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 0A25BC433E6 for ; Thu, 25 Feb 2021 13:25:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B4D5564F11 for ; Thu, 25 Feb 2021 13:25:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232429AbhBYNZA (ORCPT ); Thu, 25 Feb 2021 08:25:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232365AbhBYNY4 (ORCPT ); Thu, 25 Feb 2021 08:24:56 -0500 Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F771C06178C for ; Thu, 25 Feb 2021 05:23:57 -0800 (PST) Received: by mail-pg1-x535.google.com with SMTP id t26so3783470pgv.3 for ; Thu, 25 Feb 2021 05:23:57 -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=ZRxLQEtAZMF7ynint68drnOS3AOgo+lUwQuMfO8HfyU=; b=bGWvFZrSNsgfHLr0ndyhmQ/W8MpRAjEhFK16bykd8rK0MPQMSNokOfsjdCXRosek+b BgQhCIjQRXjEL0D96Sl+/WL9GKQ+xSLO4g2eSz6Ps4Ox7p1wtAbpaQZNpLa6cTyIcx/A cF2IdS7GUwez0O2ziSwCFvuQuGj60r98Cinnj5FOTo0MKT2jG/k8/Sz4GjkZE58Oo/zk H5bJ8FtASUuYskjULgTa0DrjEq+mfIXLy3XPUlJbGNp/xcGqtDHTS/q5RMrO0Cgo/2ki ezGlWDRrD0HqmyBHu8YE8OLGrpbYfdQMXzW2f3CjtpS6RdcFmUvhKjGVpEw3yFkcoW9v Ow0g== 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=ZRxLQEtAZMF7ynint68drnOS3AOgo+lUwQuMfO8HfyU=; b=NlNvixRj/AeGXoiVD7L0UraK2vYczXJI4D6b6A/mBWgOSxXKcyfjVz+l7wB3mEJiDE aFhz9j3nf6LjHU9d2CfN3zBLXX5+T3L2Mv72CECKiyzrICEzEX6T6dGhX924cZc/1BTS ZlBwo6EJOfpoowxHZJKVGUggMZFZ5FNs3TFuzMUYd2sQS5cXE6xQHMf8ljz3xSZf8W7I wLZzWiyrNnntj2VqVGx4U6urUtqPOLjwe2N2z/OmaAeBWRP0DqfA3hRumX0aAoC4a44z R2SURzZ6NvM5w7ClqrssLxcG0kpr2zZ44tf0BCO0QHH0YUzxfWh1OWE6XV266ouy+qhK ZfLA== X-Gm-Message-State: AOAM533J+1ZdRdjuTLxrgKNIpUbouVaw21BdmvRrX3/65Cj5I6wDt6TY f7bFd8J4TWb0AUxS/V15RtWXsw== X-Google-Smtp-Source: ABdhPJwFfKYHCSSTYgjRwYWqzJHWCMHhEBoS+v9+A+Fh/MnSpP9c6ac19THyCKs92XLKFiiS1L2msg== X-Received: by 2002:aa7:973c:0:b029:1ee:193b:6092 with SMTP id k28-20020aa7973c0000b02901ee193b6092mr2682444pfg.59.1614259436992; Thu, 25 Feb 2021 05:23:56 -0800 (PST) Received: from localhost.localdomain ([139.177.225.236]) by smtp.gmail.com with ESMTPSA id x190sm6424676pfx.166.2021.02.25.05.23.46 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Feb 2021 05:23:56 -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 v17 2/9] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Thu, 25 Feb 2021 21:21:23 +0800 Message-Id: <20210225132130.26451-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210225132130.26451-1-songmuchun@bytedance.com> References: <20210225132130.26451-1-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 Reviewed-by: Balbir Singh --- 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 eccbcf1e3f2e..b5dcc68aab25 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