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=ham 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 8EC5DC433ED for ; Mon, 10 May 2021 03:03:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E5DB613DB for ; Mon, 10 May 2021 03:03:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230185AbhEJDEr (ORCPT ); Sun, 9 May 2021 23:04:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52228 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229932AbhEJDEq (ORCPT ); Sun, 9 May 2021 23:04:46 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DEC6CC061573 for ; Sun, 9 May 2021 20:03:42 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id t2-20020a17090a0242b0290155433387beso7468102pje.1 for ; Sun, 09 May 2021 20:03:42 -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=se6vvw+ZxXlajwG5sizvmAQHljY9gpETC9t2m8A8d0Y9HfYbApkE78gIC+V1qB9Vot ywsG1i2raBCCIQsCtzqFwtFJdWe0MimiHP0FJjTuvvwzSnPucHPo7Nk+l9UrFa9FhFkk 0JWkLo4Aw2V1BfyM+7d7D5kOXihO99OFcVtOtv/XRCY7TNe8E+xgR4A0eawa4YpCKX24 Js9XK0bAyW72BRD19Y94mn6l2p+kx6rZnoEuSViOzvpl40ZPe9vJeUQBYCCKGu6rW3uv 3VIj9a4PB0zRqpxWp2z0+cDaojmyIft9Jhvx1ATYQ6Lqi6xvxBsaJUalBSXkV6ee92+s tucA== 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=bPcBJVVrcnqZC5PUgfH1mbdW16YVV2WB/9Em6K1nz7YeCdeWzREtngHDE7WuAmXy24 fsaPPUBU897XJuGNpLLoo39bXTgvW0Hi3MmeQzJuZQWkeJd9Och9cA9HvEUVhiVwpWR8 /PpqsyVcKD6ccH8To8KFTJPIlD6TfNpP3yZLfjRqYB8bb3edmYAYoFmqgXBkpxPCogHb Yyy9ciEm0xx5NEuSW1P8oB36cobOl8AqX4vvhc6te55nGo/kh49AILIfvDp8OKqWAftx zckzRyxXwusmQLkAQimN1HtM6EndKl+r0uhJAsXuirhr8cXCqC3RsGiuU41Wz9iRcg3l T3cw== X-Gm-Message-State: AOAM532T69fcjj2C8UqOHKLCoCy6MsyFSMxsqfkCUn73nbfL4tyKcZDz F62BF5wsjZWCYSS39EWxzo+W7w== X-Google-Smtp-Source: ABdhPJyypjzDhVvwpYM+JNuM2Xff9zlPlQPYTmNz590Ba8hKgYV7zewXPMixkOG6QOz0mL9vsjxj1w== X-Received: by 2002:a17:902:bcc7:b029:ed:6f73:ffc4 with SMTP id o7-20020a170902bcc7b02900ed6f73ffc4mr21980606pls.1.1620615822268; Sun, 09 May 2021 20:03:42 -0700 (PDT) Received: from localhost.localdomain ([139.177.225.236]) by smtp.gmail.com with ESMTPSA id a128sm9777003pfd.115.2021.05.09.20.03.30 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 09 May 2021 20:03:41 -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, zhengqi.arch@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 v23 2/9] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Mon, 10 May 2021 11:00:20 +0800 Message-Id: <20210510030027.56044-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210510030027.56044-1-songmuchun@bytedance.com> References: <20210510030027.56044-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@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