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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 26FACC55179 for ; Thu, 22 Oct 2020 12:58:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D1B2222267 for ; Thu, 22 Oct 2020 12:58:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2899167AbgJVM6p (ORCPT ); Thu, 22 Oct 2020 08:58:45 -0400 Received: from mx2.suse.de ([195.135.220.15]:60054 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2505297AbgJVM6o (ORCPT ); Thu, 22 Oct 2020 08:58:44 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 29B0CAEDA; Thu, 22 Oct 2020 12:58:43 +0000 (UTC) From: Oscar Salvador To: david@redhat.com Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, vbabka@suse.cz, pasha.tatashin@soleen.com, Oscar Salvador Subject: [RFC PATCH 2/3] mm: Introduce a new Vmemmap page-type Date: Thu, 22 Oct 2020 14:58:34 +0200 Message-Id: <20201022125835.26396-3-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20201022125835.26396-1-osalvador@suse.de> References: <20201022125835.26396-1-osalvador@suse.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch introduces a new Vmemmap page-type so we can better picture and handle those kind of pages. Signed-off-by: Oscar Salvador --- include/linux/mm.h | 6 ++++++ include/linux/mm_types.h | 5 +++++ include/linux/page-flags.h | 6 ++++++ 3 files changed, 17 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index ef360fe70aaf..48845f054136 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3126,6 +3126,12 @@ static inline bool debug_guardpage_enabled(void) { return false; } static inline bool page_is_guard(struct page *page) { return false; } #endif /* CONFIG_DEBUG_PAGEALLOC */ +static __always_inline unsigned long vmemmap_nr_pages(struct page *page) +{ + struct page *head = (struct page *)page->vmemmap_head; + return head->vmemmap_pages - (page - head); +} + #if MAX_NUMNODES > 1 void __init setup_nr_node_ids(void); #else diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index ae891c0c55fc..0bb8de4262c3 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -171,6 +171,11 @@ struct page { * pmem backed DAX files are mapped. */ }; + struct { /* Vmemmap pages */ + unsigned long vmemmap_head; + unsigned long vmemmap_sections; /* Number of sections */ + unsigned long vmemmap_pages; /* Number of pages */ + }; /** @rcu_head: You can use this to free a page by RCU. */ struct rcu_head rcu_head; diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 4f6ba9379112..2bad207515fa 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -718,6 +718,7 @@ PAGEFLAG_FALSE(DoubleMap) #define PG_kmemcg 0x00000200 #define PG_table 0x00000400 #define PG_guard 0x00000800 +#define PG_vmemmap 0x00001000 #define PageType(page, flag) \ ((page->page_type & (PAGE_TYPE_BASE | flag)) == PAGE_TYPE_BASE) @@ -784,6 +785,11 @@ PAGE_TYPE_OPS(Table, table) */ PAGE_TYPE_OPS(Guard, guard) +/* + * Vmemmap pages (see include/linux/memory_hotplug.h). + */ +PAGE_TYPE_OPS(Vmemmap, vmemmap) + extern bool is_free_buddy_page(struct page *page); __PAGEFLAG(Isolated, isolated, PF_ANY); -- 2.26.2