From mboxrd@z Thu Jan 1 00:00:00 1970 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 63B84C4332D 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 18DFA64F06 for ; Thu, 25 Feb 2021 13:25:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232476AbhBYNZG (ORCPT ); Thu, 25 Feb 2021 08:25:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232465AbhBYNZB (ORCPT ); Thu, 25 Feb 2021 08:25:01 -0500 Received: from mail-pf1-x42d.google.com (mail-pf1-x42d.google.com [IPv6:2607:f8b0:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 71886C061794 for ; Thu, 25 Feb 2021 05:23:57 -0800 (PST) Received: by mail-pf1-x42d.google.com with SMTP id b145so3607402pfb.4 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=O4oenbKkbsOhCuImmr1nrmsPWjWzcYAz23vvvCPMVASlbeEveqWYGQDI+FakGhkJXY x8Z+hk5tmtvwfhGQjzm/ukhXPOgIybSsv60WYXEZ7H17+LBaH8QDb7Daypm24c2fRhXq LrkzFi4ab0Nb+VQH4uUqUoSXnorGXRJv7GEHpIR1HQVFYuvm5hjJRpvj+UOI51iBv8YE ymz15RCwEAA0yD2Kf/jg45SIOjXnk9MEmgnh5S3ACbvGOOKYIGDVRNN5H4guvBH57FKI 6e3Stln5+06Fhtm5rTTa0DX2uOYtyZ/BiD1lxct3GRe6xwt0NjCTWX9hrWRQDlnIONt7 2V7w== X-Gm-Message-State: AOAM530ujwnLuXXL1deMIe7PFxlz8th8Qq5+FBmw8z6142kLGHlOfBvb upZayxePl1o7g9g/v96bF/0YJQ== 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 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@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 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 -- 2.11.0