From patchwork Mon Nov 30 15:18:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muchun Song X-Patchwork-Id: 11940819 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 13950C64E7B for ; Mon, 30 Nov 2020 15:21:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AAC452074A for ; Mon, 30 Nov 2020 15:21:47 +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="ZjgH0vr+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727403AbgK3PVM (ORCPT ); Mon, 30 Nov 2020 10:21:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728013AbgK3PVM (ORCPT ); Mon, 30 Nov 2020 10:21:12 -0500 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BC6A2C0613D2 for ; Mon, 30 Nov 2020 07:20:12 -0800 (PST) Received: by mail-pg1-x544.google.com with SMTP id m9so10273019pgb.4 for ; Mon, 30 Nov 2020 07:20:12 -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=9VN22FTK/cp8gibu50+JlwycxClP9nhjODvnGGV4tug=; b=ZjgH0vr+7SnQsHcGa2K/AiAuo7pJtkSwgWtJ++8mJ2N5dpvx4/q685PNvhcPi2L4RH zFqwO9fa0PZR53uIZxgbwWomp0bb+gwW+M0LnTiAdcqN2Q4Tt2XVUs+9Dk0QZFvzzoiF 9g4nQSo6Jyu0zrA7kF1DrDaVrzm3y6zUMZ7QVrtPujRAD+1WRi9xBGRW1rC+CFtvp2WJ sWszVSoUAnOMDq/t6yIZ/EewSR2lsiYjvv/3iPi30y9MJU19LbuhfIcXTphhMiKAqrg2 D9DlSAWK4DROV+/PKZvKzx1pF3xpR1IgUoEmV05vYOLbTqAhByvCExHRdsEN2B9Jygsh 7Hsg== 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=9VN22FTK/cp8gibu50+JlwycxClP9nhjODvnGGV4tug=; b=RNwfg6ewozi/U7n8ElsXz0lfev8734n+n74hzEEz773SAzPjeknC8WoSownmElilqr x+qAJFc7clMKcs8MQxqRBajlIN3uF3ewDElT2y0lPVs+w6J/1KyIN/Naghljsb9KLwfm atuqjzAoHQoMNLXP/FGlrPC3vosaCkAXKq3RR0uLGrMoJxLxK48y0fALk/YkZzKRiIUV /mulWd+eo4ol3uIahYFDHuiGNS8GkYwSxjckkDJAqXe5PTGsfd7/as+ewEFYQea54iqd O9batQc04kCEOs/VhcTJDW+nGsv+V18sBi82Pt2ujKwW7y6YFjBbRBUICbf+yVojUrPQ 4V2Q== X-Gm-Message-State: AOAM53158NNyazIRWWCbQkRbGNN7evDZatCNxyfcKp+u7EwTPUaVTsRO GLG3tYa4MZHH/m5T3tJatTlBUA== X-Google-Smtp-Source: ABdhPJyhD8o0jzVpPs+toSeNAsFByTmDI0pdIsUlVpAmaWm//ETZis2DFWTt1ieO0wvLlKMNFBzcgA== X-Received: by 2002:a05:6a00:13a4:b029:18b:cfc9:1ea1 with SMTP id t36-20020a056a0013a4b029018bcfc91ea1mr19086071pfg.25.1606749612267; Mon, 30 Nov 2020 07:20:12 -0800 (PST) Received: from localhost.bytedance.net ([103.136.221.68]) by smtp.gmail.com with ESMTPSA id q12sm16201660pgv.91.2020.11.30.07.20.02 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Nov 2020 07:20:11 -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 05/15] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Date: Mon, 30 Nov 2020 23:18:28 +0800 Message-Id: <20201130151838.11208-6-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 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org In the later patch, we can use the free_vmemmap_page() to free the unused vmemmap pages and initialize a page for vmemmap page using via prepare_vmemmap_page(). Signed-off-by: Muchun Song --- include/linux/bootmem_info.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/include/linux/bootmem_info.h b/include/linux/bootmem_info.h index 4ed6dee1adc9..239e3cc8f86c 100644 --- a/include/linux/bootmem_info.h +++ b/include/linux/bootmem_info.h @@ -3,6 +3,7 @@ #define __LINUX_BOOTMEM_INFO_H #include +#include /* * Types for free bootmem stored in page->lru.next. These have to be in @@ -22,6 +23,29 @@ void __init register_page_bootmem_info_node(struct pglist_data *pgdat); void get_page_bootmem(unsigned long info, struct page *page, unsigned long type); void put_page_bootmem(struct page *page); + +static inline void free_vmemmap_page(struct page *page) +{ + VM_WARN_ON(!PageReserved(page) || page_ref_count(page) != 2); + + /* bootmem page has reserved flag in the reserve_bootmem_region */ + if (PageReserved(page)) { + unsigned long magic = (unsigned long)page->freelist; + + if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) + put_page_bootmem(page); + else + WARN_ON(1); + } +} + +static inline void prepare_vmemmap_page(struct page *page) +{ + unsigned long section_nr = pfn_to_section_nr(page_to_pfn(page)); + + get_page_bootmem(section_nr, page, SECTION_INFO); + mark_page_reserved(page); +} #else static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) {