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,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 73807C433E0 for ; Tue, 22 Dec 2020 14:30:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 498B12312E for ; Tue, 22 Dec 2020 14:30:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727665AbgLVOav (ORCPT ); Tue, 22 Dec 2020 09:30:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39758 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727172AbgLVOat (ORCPT ); Tue, 22 Dec 2020 09:30:49 -0500 Received: from mail-pg1-x52d.google.com (mail-pg1-x52d.google.com [IPv6:2607:f8b0:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CDEDC061257 for ; Tue, 22 Dec 2020 06:29:51 -0800 (PST) Received: by mail-pg1-x52d.google.com with SMTP id p18so8446152pgm.11 for ; Tue, 22 Dec 2020 06:29:51 -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=ntojA21L7AWHHQRUBdhZHwBioWXg1bVrcDP2ArBhkkY=; b=XTTONU2KZyeFIIukV/BEYoa3ybU4lZ89lYtgBqJ1YEuOA9kkye11aJ91ssriUtJ4F+ vXAfW2eN15sPIGPeOX8NTzTs0K8/CGg8oaTVLSCpaNQ+BlYuHMhjWi3dIlkbgPQPOOAh 9NWYI3ZLds0WcSf53RD5hHHtXjxQRUMwXlt4231q+ReNs7A2XyIa5qlL5yf1IFLGazvU jV/vu6/OwgYhLa93+DACagHBc6EOIrEMG5CZUVLC5UlbhalmucW6ugVkhQ9rEtqHzPMu wGFC9fy58EIrm0sitEf0aJ9c9PaEKeyWDUPqB22b2HqSBL9gSH/XiCbGcYcb1eTUuOUi Y/bw== 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=ntojA21L7AWHHQRUBdhZHwBioWXg1bVrcDP2ArBhkkY=; b=N0dqD1qOefIIrxeub6RdhxbsPAIkPj2m1Z8ZWGv73y0jEIM1R1qBw4ccV8QE2W3VMD egIi0B6CaOCJPOHX3Z61wfKMsv864ICAbDO87vh6X4EnqczPJGzdHEKkcPQR2mJcqX5G 71r3BYRAeJot0iIT1vqgW8lgAQ6cajDSnrVV8PrtS9OAd3ZwEIEk00o6ROrPcRV18X11 3hXrRspuSC1IBhtZuOIzwI5m2fmHAcV1gv+Gpfsl5hXhTdvsb3OQ0wWrGb49HiEDeUFw 00B9jCCK1vIm/68jyIaHWSYTlPmuyxyCtTDjVsxwn/JaOF+g69DbRTJsryD5nODr55Jr C/sA== X-Gm-Message-State: AOAM5326uhdUOEc8tyxzk52oYRQFz5yRPh28zbxsEnAdB95wQVvvLO1c VRm6r8a+KQLhqX1jOEforIvMbQ== X-Google-Smtp-Source: ABdhPJzCUCmTavcCtYy0Cgeu988bfVe0mdBav9lSJTTmQ2B5meYZqqFRw1PChtjMNZxchKxCfkqcwQ== X-Received: by 2002:a62:8683:0:b029:1a4:4f3f:7e75 with SMTP id x125-20020a6286830000b02901a44f3f7e75mr20092143pfd.68.1608647391128; Tue, 22 Dec 2020 06:29:51 -0800 (PST) Received: from localhost.bytedance.net ([139.177.225.247]) by smtp.gmail.com with ESMTPSA id a31sm21182088pgb.93.2020.12.22.06.29.39 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 22 Dec 2020 06:29:50 -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 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 v11 02/11] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Tue, 22 Dec 2020 22:24:31 +0800 Message-Id: <20201222142440.28930-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201222142440.28930-1-songmuchun@bytedance.com> References: <20201222142440.28930-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The HUGETLB_PAGE_FREE_VMEMMAP option is used to enable the freeing of unnecessary vmemmap associated with HugeTLB pages. 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 --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 18 ++++++++++++++++++ 2 files changed, 19 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..e7c4c2a79311 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -245,6 +245,24 @@ 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 + help + 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. + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS -- 2.11.0