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 CFCC8C2D0E4 for ; Tue, 24 Nov 2020 09:57:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 74AFD2076B for ; Tue, 24 Nov 2020 09:57:37 +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="Teew9Gvu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731566AbgKXJ5R (ORCPT ); Tue, 24 Nov 2020 04:57:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57130 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731321AbgKXJ5Q (ORCPT ); Tue, 24 Nov 2020 04:57:16 -0500 Received: from mail-pl1-x642.google.com (mail-pl1-x642.google.com [IPv6:2607:f8b0:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 68979C0617A6 for ; Tue, 24 Nov 2020 01:57:15 -0800 (PST) Received: by mail-pl1-x642.google.com with SMTP id u2so10423701pls.10 for ; Tue, 24 Nov 2020 01:57:15 -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=Teew9GvubUfF7KXPZ0vrHLrrdljg0Jw0SHTS0miGJ+H6HSyJHNWx1gygUfRYCkCrw+ EFlGXQHbhIpnw8VIJKvVn4N3/oQ/DX9sOoWurp6agSO9mb8j7HwAT5HTBnBH1IQVvsna fDeuYUqOhNQomskdJzjwkVHcasMWrx3FEUjTx3ntf1w2c+IiqrHinlQ3zoo6pFATvJ1G K45S4R7n1zZbkYNmNDSvo2Lc5p4+HIJ5CL1tSne7ARclcUu/D609C3ImDl6jiPGuS9ZX gXvkFgnL1TrHD1X2zyk+ZphWPFsdUlyNF1qz7TBA6lPcHVBeCqRT5PHJO4KwXbDrDI+v 9u0A== 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=uUW1+pxfDyFTuxCawZpvmYkHEgDcjjSiWFi4zHVib0DWhMFNl0QIhvSPtz0rd+Vv2l FrTyLkSgK0NESYU8orb/USDAyGs2t6G0h0tM3YT6aoeuE1Z1O5hdlUwzzjnEMIr0tDvI dpIrp5xLaGKjovJKRRLE5tXrdG7kaTL4Bea6J1133qSbNpLWciqvJhRhVKudQFystPY7 fF2yHm5WRX6vZnUc5yZ5RcU1zZumUV0e1d5Rag3E1blApfApHUwKpiU9xyKMRLQ0HEsn SRYiClrQPzRBLI+1f2B8IJk6T5t6LYcdLyZfPMJwLYzXktHCAGTd4eZHpZVjEJb9Qrqs wz8Q== X-Gm-Message-State: AOAM530ka+rsGomc+6QCak8fzduQquEiRWSuep2qiPm1tAcmeVx2B/RJ yNEF1h3y8DwM2MDdg3ZUTCkYVA== X-Google-Smtp-Source: ABdhPJzwWHwqGMfwuSes+ofTOYpFZkuqkNbGuqv07A6D+lBpddBbGPWVNDBt6EKW68EcbG3uetJiWA== X-Received: by 2002:a17:902:b192:b029:d7:ca4a:4ec1 with SMTP id s18-20020a170902b192b02900d7ca4a4ec1mr3406894plr.76.1606211834998; Tue, 24 Nov 2020 01:57:14 -0800 (PST) Received: from localhost.localdomain ([103.136.220.120]) by smtp.gmail.com with ESMTPSA id t20sm2424562pjg.25.2020.11.24.01.57.02 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 24 Nov 2020 01:57:14 -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 v6 03/16] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Tue, 24 Nov 2020 17:52:46 +0800 Message-Id: <20201124095259.58755-4-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201124095259.58755-1-songmuchun@bytedance.com> References: <20201124095259.58755-1-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