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 32848C43381 for ; Mon, 8 Feb 2021 09:09:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC87164E7A for ; Mon, 8 Feb 2021 09:09:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230087AbhBHJIy (ORCPT ); Mon, 8 Feb 2021 04:08:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230514AbhBHIxB (ORCPT ); Mon, 8 Feb 2021 03:53:01 -0500 Received: from mail-pf1-x436.google.com (mail-pf1-x436.google.com [IPv6:2607:f8b0:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 15F91C061793 for ; Mon, 8 Feb 2021 00:52:21 -0800 (PST) Received: by mail-pf1-x436.google.com with SMTP id q131so9256777pfq.10 for ; Mon, 08 Feb 2021 00:52:21 -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=JUZ4MFsdXR4hp+BnnV2hi08VuIcdttJcd2cotNmYKQrT7TAG4RkefVd88CspsB3P9R zldr02H9XiwWjb1lPWuO/7Py20dVcmwOt1otZKIxB4NSlJ3Evef7aXNUQJUCb14U8btD erfyH7/Mu8CWDYm2pMi4vynL20XecWeJEoGOLQpdADOdBhtimJWYauQowkW29tkyCmME YuSXX8myWvUeBBDE7Zh5Bi9sCWYa28mZknE45EWmlwMXt2zoWruExJrIT/3eNWLn+WiM PPR8+ytSROYBaioUoaPB2nsRVUnrrZc8St9u+lbczcXt/XOE2MlE7d2Va6dLBsV6KWYv Uttw== 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=MB6kmhOr1ib5sNvIEA5AxjcivFi+hNlltH8pS5Fl5NdV5pIyMfxxzu1LO7kFxOR5RZ C6H8bqLCFOD2GYm8Zn+Xfm4n/Z3nwY6bpqVwd7jQhvDaK/ABiC98cHq/JqjTNoyts5Bh wKvqrDXmrOcgKrSAKbBwa1OG+Wsb0U02RiUtJiO7TajU3Efjz1xLHsR3ekH+m67UWm2U gcEuw1BUOw/VQ8Y3qZ43kdoBAaXW81iQrjtDA9SCeB5J5T+qMFz7pbF7Gc8viGvnPHhk VebnQzLeGSPw4m4PZmY4gl87B0NZjMTR01vwttChrxI8JN+91FaamIj8RtYdSOXNWCOr arqQ== X-Gm-Message-State: AOAM531pl/KBH16erslyTfGqi+RYPQ+PgW6hHtQ7goI3V6kv6MH+Ts+b 1DzLzUaliYz1GzSx4cUq6LE2SQ== X-Google-Smtp-Source: ABdhPJyIBc3e1Ab4xPqcnD0UvQ16vZjx4Sk7aRqUuMiWvLTpD06jfwOwndhVTsG0YDjiBQsI4X/EpA== X-Received: by 2002:a63:cb4c:: with SMTP id m12mr15899771pgi.51.1612774340664; Mon, 08 Feb 2021 00:52:20 -0800 (PST) Received: from localhost.localdomain ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id g15sm17205179pfb.30.2021.02.08.00.52.07 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 08 Feb 2021 00:52:20 -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 v15 2/8] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Mon, 8 Feb 2021 16:50:07 +0800 Message-Id: <20210208085013.89436-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210208085013.89436-1-songmuchun@bytedance.com> References: <20210208085013.89436-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 -- 2.11.0