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 A44E2C433ED for ; Thu, 15 Apr 2021 08:42:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 75B356137D for ; Thu, 15 Apr 2021 08:42:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231920AbhDOInJ (ORCPT ); Thu, 15 Apr 2021 04:43:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46416 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231871AbhDOInE (ORCPT ); Thu, 15 Apr 2021 04:43:04 -0400 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4FEB2C061756 for ; Thu, 15 Apr 2021 01:42:41 -0700 (PDT) Received: by mail-pl1-x634.google.com with SMTP id d8so11656397plh.11 for ; Thu, 15 Apr 2021 01:42:41 -0700 (PDT) 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=SoZb++zfv4yAwjnBuF75FK8ZgZmHYksA4MNIPLiTWic=; b=qb4x4kPnL1dlpXI/+d0gpkF9kwYzBftXjo9PWqIU+lemjVOupYoguZKtb3/kCWI/mA T9JH4OZFrCtydpvncc4zCUgGk6vtkX7DUfps28LPiF2CQjU+dSmQ8bBSEpkKk4ne6rhK 6yf9mefEVL7Mj17r33WvTPAvFZkVKDKuPHKB7BuJNleKt/82bfR+1hwlKwec4Ts2CFNY MnQNsL1wYBWXbPnU5p6kkIspVCmbqqzPWvgQXKAAh6qG2D5iOdz+Lx0iyqlBrHuetu1t OrInlgTR0i7KbWcXGiSWYs82WBbE93RYJV+Jgh4OIIg1mbtCwYiQyK7MckgrwHKEdUoe Df5w== 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=SoZb++zfv4yAwjnBuF75FK8ZgZmHYksA4MNIPLiTWic=; b=cmZ6w018/Q9umj+kax6nkc671S/9XRFymirnAPTzc/vqINW4HIEK2BZ6Ntz/yfD3QM wqSYxO+l2VnoHnxmtWpIIA/6cdSHXC8Ny3mYB4w6/zPUD0kfR1I9/qYvhtqXieTsPrrT +FalF+GW8kWV0ZfSBSkFq7D+7H1FNTo7kYnUlhgf/V5wgsU2qM4K6C0fvCIkbPvMbFY9 sK7fnnqu12roY6MTZVnan/jzJ3AHEMLjjqfG+9ngXhf3Mq8NnFRt33W89nCkTHRLKPDa RGcrZIN38vFSU1gE26v1RCwst5NUY2SDnMTlEqf1nEN6C3NDVS8c6Lg/SQizWNaTjObm B37A== X-Gm-Message-State: AOAM531eNRwvt5xcBGHWKea0VqigdpjvtorYEjd9D9TVbWqulAKPyfJV 9rNMhkNe75OOHZ/rGJ94wdMTKA== X-Google-Smtp-Source: ABdhPJyzbv6Qvy5O0BwCVmcna9pkNkXi+jWZJy9ZJO77vt43H2p7otmlQGPUwJTF2JUh3+JZ9iTBOQ== X-Received: by 2002:a17:90a:6be2:: with SMTP id w89mr2653717pjj.130.1618476160886; Thu, 15 Apr 2021 01:42:40 -0700 (PDT) Received: from localhost.localdomain ([139.177.225.234]) by smtp.gmail.com with ESMTPSA id e13sm1392365pgt.91.2021.04.15.01.42.28 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Apr 2021 01:42:40 -0700 (PDT) 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, 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, fam.zheng@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 , Chen Huang , Bodeddula Balasubramaniam , Balbir Singh Subject: [PATCH v20 2/9] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Thu, 15 Apr 2021 16:39:58 +0800 Message-Id: <20210415084005.25049-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210415084005.25049-1-songmuchun@bytedance.com> References: <20210415084005.25049-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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. If config HAVE_BOOTMEM_INFO_NODE is enabled, the freeing vmemmap page code denpend on it to free vmemmap pages. Otherwise, just use free_reserved_page() to free vmemmmap pages. 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 Tested-by: Chen Huang Tested-by: Bodeddula Balasubramaniam Reviewed-by: Balbir Singh --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 3aaf1d30c777..65ea58527176 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1270,7 +1270,7 @@ 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 dcd9161fbeba..6ce6fdac00a3 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -240,6 +240,11 @@ 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 + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS -- 2.11.0