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 DC0D9C83012 for ; Mon, 30 Nov 2020 15:21:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7AB8720731 for ; Mon, 30 Nov 2020 15:21:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bytedance-com.20150623.gappssmtp.com header.i=@bytedance-com.20150623.gappssmtp.com header.b="2RhaWzxG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727984AbgK3PU5 (ORCPT ); Mon, 30 Nov 2020 10:20:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725859AbgK3PU4 (ORCPT ); Mon, 30 Nov 2020 10:20:56 -0500 Received: from mail-pf1-x444.google.com (mail-pf1-x444.google.com [IPv6:2607:f8b0:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 11387C061A49 for ; Mon, 30 Nov 2020 07:19:53 -0800 (PST) Received: by mail-pf1-x444.google.com with SMTP id b63so10583880pfg.12 for ; Mon, 30 Nov 2020 07:19:53 -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=s5A1WGxjr1FnragMjsAXSXENwZtbX/VCL9QpT/2OWj4=; b=2RhaWzxGXNZnya4RQPVLYlTnC7p3ZJDfJBjoHJOKw1nuorEtEwtoefBftJvHjLcflk kPYdC5SwmiucMjvq4oiRjhYikOhX9BF1E3oNIf4x4Bv7w5n1dCgtIQvu/hrOYoDK7RMT pa0Klx+p9AdLAk69s5ykJFlLNGtySFPARC3mdi2/ty3Y0cpML7NB7/97SK6lXtcLBPM+ VALfqV8XVPl9DbXTj7k3Cr8vvTU/pmX9IEiwDsSU76BJllQQ5cJEtCdAKtYzWYuDDq93 PW44EpYKpW9tEG2fQqZPNlefbJ0r/rX48FObKp8vOJOw+QM8Suyx4kejZtq54Lzl8KGU awLA== 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=s5A1WGxjr1FnragMjsAXSXENwZtbX/VCL9QpT/2OWj4=; b=ns5l7+IY0vrdf6MaJPKj1kHe1IqfCW8yAYavKGAyaxITVY1d63yia9tz7hEbE6Vm88 PzqsgkVjREB3yGEa7+ZHTuccET+hR74aue2Nq81mMMbSAi70qH/GioUJ44LkF+CSxyG8 yYC/yXbDd6VNgmlI27J+NzR3aq+4OAY1Y9LOkEDBEDI3QrhxXqKC+AJkn+hgaYCtxeqi fIPCcuTGNFnpI618d6c6/OtObODZginipZuZukpxUYAF7ouhTyDwB0E/iy17fs04X0eW GNG/7yMhTZOUR4hgJWcppo47l0K2ASR8PY4d+icOG1HWMLrv+NpCaHDkpNKrMFxvRcZ8 HKgw== X-Gm-Message-State: AOAM532nAcsE4nYkq6KNfkiMhQJOc+HeBaMiqC5joQs0sZRB0O+MuKVI P+9WRQry9w20T9ZQSTA3QkvGng== X-Google-Smtp-Source: ABdhPJx9gSDS4GWuDavFvp1c4l+QTjvwTBoXyiVDOJlXic9chR+sTx650tLab9Bjlxv0+Rv8nxRWQg== X-Received: by 2002:a62:ce4c:0:b029:198:1f1:8743 with SMTP id y73-20020a62ce4c0000b029019801f18743mr19245889pfg.79.1606749592623; Mon, 30 Nov 2020 07:19:52 -0800 (PST) Received: from localhost.bytedance.net ([103.136.221.68]) by smtp.gmail.com with ESMTPSA id q12sm16201660pgv.91.2020.11.30.07.19.43 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Nov 2020 07:19:52 -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 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 Subject: [PATCH v7 03/15] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Mon, 30 Nov 2020 23:18:26 +0800 Message-Id: <20201130151838.11208-4-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201130151838.11208-1-songmuchun@bytedance.com> References: <20201130151838.11208-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The purpose of introducing HUGETLB_PAGE_FREE_VMEMMAP is to configure whether to enable the feature of freeing unused vmemmap associated with HugeTLB pages. And this is just for dependency check. Now only support x86. Signed-off-by: Muchun Song --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 14 ++++++++++++++ 2 files changed, 15 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 976e8b9033c4..4961dd488444 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -245,6 +245,20 @@ config HUGETLBFS config HUGETLB_PAGE def_bool HUGETLBFS +config HUGETLB_PAGE_FREE_VMEMMAP + def_bool HUGETLB_PAGE + depends on X86 + depends on SPARSEMEM_VMEMMAP + depends on HAVE_BOOTMEM_INFO_NODE + help + When using HUGETLB_PAGE_FREE_VMEMMAP, the system can save up some + memory from pre-allocated HugeTLB pages when they are not used. + 6 pages per 2MB HugeTLB page and 4094 per 1GB HugeTLB page. + + When the pages are going to be used or freed up, the vmemmap array + representing that range needs to be remapped again and the pages + we discarded earlier need to be rellocated again. + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS -- 2.11.0