From patchwork Mon May 8 07:11:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kefeng Wang X-Patchwork-Id: 680459 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFC7DC77B73 for ; Mon, 8 May 2023 06:54:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232993AbjEHGyz (ORCPT ); Mon, 8 May 2023 02:54:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232741AbjEHGyv (ORCPT ); Mon, 8 May 2023 02:54:51 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B17AEA5FC; Sun, 7 May 2023 23:54:49 -0700 (PDT) Received: from dggpemm500001.china.huawei.com (unknown [172.30.72.56]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4QFBkl6pXLz18LDr; Mon, 8 May 2023 14:50:39 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Mon, 8 May 2023 14:54:47 +0800 From: Kefeng Wang To: Andrew Morton , Mike Rapoport , CC: David Hildenbrand , Oscar Salvador , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Luis Chamberlain , Kees Cook , Iurii Zaikin , , , , Kefeng Wang Subject: [PATCH 03/12] mm: page_alloc: move set_zone_contiguous() into mm_init.c Date: Mon, 8 May 2023 15:11:51 +0800 Message-ID: <20230508071200.123962-4-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230508071200.123962-1-wangkefeng.wang@huawei.com> References: <20230508071200.123962-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org set_zone_contiguous() is only used in mm init/hotplug, and clear_zone_contiguous() only used in hotplug, move them from page_alloc.c to the more appropriate file. Signed-off-by: Kefeng Wang --- include/linux/memory_hotplug.h | 3 -- mm/internal.h | 7 +++ mm/mm_init.c | 74 +++++++++++++++++++++++++++++++ mm/page_alloc.c | 79 ---------------------------------- 4 files changed, 81 insertions(+), 82 deletions(-) diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 9fcbf5706595..04bc286eed42 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -326,9 +326,6 @@ static inline int remove_memory(u64 start, u64 size) static inline void __remove_memory(u64 start, u64 size) {} #endif /* CONFIG_MEMORY_HOTREMOVE */ -extern void set_zone_contiguous(struct zone *zone); -extern void clear_zone_contiguous(struct zone *zone); - #ifdef CONFIG_MEMORY_HOTPLUG extern void __ref free_area_init_core_hotplug(struct pglist_data *pgdat); extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); diff --git a/mm/internal.h b/mm/internal.h index e28442c0858a..9482862b28cc 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -371,6 +371,13 @@ static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn, return __pageblock_pfn_to_page(start_pfn, end_pfn, zone); } +void set_zone_contiguous(struct zone *zone); + +static inline void clear_zone_contiguous(struct zone *zone) +{ + zone->contiguous = false; +} + extern int __isolate_free_page(struct page *page, unsigned int order); extern void __putback_isolated_page(struct page *page, unsigned int order, int mt); diff --git a/mm/mm_init.c b/mm/mm_init.c index 15201887f8e0..1f30b9e16577 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -2330,6 +2330,80 @@ void __init init_cma_reserved_pageblock(struct page *page) } #endif +/* + * Check that the whole (or subset of) a pageblock given by the interval of + * [start_pfn, end_pfn) is valid and within the same zone, before scanning it + * with the migration of free compaction scanner. + * + * Return struct page pointer of start_pfn, or NULL if checks were not passed. + * + * It's possible on some configurations to have a setup like node0 node1 node0 + * i.e. it's possible that all pages within a zones range of pages do not + * belong to a single zone. We assume that a border between node0 and node1 + * can occur within a single pageblock, but not a node0 node1 node0 + * interleaving within a single pageblock. It is therefore sufficient to check + * the first and last page of a pageblock and avoid checking each individual + * page in a pageblock. + * + * Note: the function may return non-NULL struct page even for a page block + * which contains a memory hole (i.e. there is no physical memory for a subset + * of the pfn range). For example, if the pageblock order is MAX_ORDER, which + * will fall into 2 sub-sections, and the end pfn of the pageblock may be hole + * even though the start pfn is online and valid. This should be safe most of + * the time because struct pages are still initialized via init_unavailable_range() + * and pfn walkers shouldn't touch any physical memory range for which they do + * not recognize any specific metadata in struct pages. + */ +struct page *__pageblock_pfn_to_page(unsigned long start_pfn, + unsigned long end_pfn, struct zone *zone) +{ + struct page *start_page; + struct page *end_page; + + /* end_pfn is one past the range we are checking */ + end_pfn--; + + if (!pfn_valid(end_pfn)) + return NULL; + + start_page = pfn_to_online_page(start_pfn); + if (!start_page) + return NULL; + + if (page_zone(start_page) != zone) + return NULL; + + end_page = pfn_to_page(end_pfn); + + /* This gives a shorter code than deriving page_zone(end_page) */ + if (page_zone_id(start_page) != page_zone_id(end_page)) + return NULL; + + return start_page; +} + +void set_zone_contiguous(struct zone *zone) +{ + unsigned long block_start_pfn = zone->zone_start_pfn; + unsigned long block_end_pfn; + + block_end_pfn = pageblock_end_pfn(block_start_pfn); + for (; block_start_pfn < zone_end_pfn(zone); + block_start_pfn = block_end_pfn, + block_end_pfn += pageblock_nr_pages) { + + block_end_pfn = min(block_end_pfn, zone_end_pfn(zone)); + + if (!__pageblock_pfn_to_page(block_start_pfn, + block_end_pfn, zone)) + return; + cond_resched(); + } + + /* We confirm that there is no hole */ + zone->contiguous = true; +} + void __init page_alloc_init_late(void) { struct zone *zone; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 4f094ba7c8fb..fe7c1ee5becd 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1480,85 +1480,6 @@ void __free_pages_core(struct page *page, unsigned int order) __free_pages_ok(page, order, FPI_TO_TAIL); } -/* - * Check that the whole (or subset of) a pageblock given by the interval of - * [start_pfn, end_pfn) is valid and within the same zone, before scanning it - * with the migration of free compaction scanner. - * - * Return struct page pointer of start_pfn, or NULL if checks were not passed. - * - * It's possible on some configurations to have a setup like node0 node1 node0 - * i.e. it's possible that all pages within a zones range of pages do not - * belong to a single zone. We assume that a border between node0 and node1 - * can occur within a single pageblock, but not a node0 node1 node0 - * interleaving within a single pageblock. It is therefore sufficient to check - * the first and last page of a pageblock and avoid checking each individual - * page in a pageblock. - * - * Note: the function may return non-NULL struct page even for a page block - * which contains a memory hole (i.e. there is no physical memory for a subset - * of the pfn range). For example, if the pageblock order is MAX_ORDER, which - * will fall into 2 sub-sections, and the end pfn of the pageblock may be hole - * even though the start pfn is online and valid. This should be safe most of - * the time because struct pages are still initialized via init_unavailable_range() - * and pfn walkers shouldn't touch any physical memory range for which they do - * not recognize any specific metadata in struct pages. - */ -struct page *__pageblock_pfn_to_page(unsigned long start_pfn, - unsigned long end_pfn, struct zone *zone) -{ - struct page *start_page; - struct page *end_page; - - /* end_pfn is one past the range we are checking */ - end_pfn--; - - if (!pfn_valid(end_pfn)) - return NULL; - - start_page = pfn_to_online_page(start_pfn); - if (!start_page) - return NULL; - - if (page_zone(start_page) != zone) - return NULL; - - end_page = pfn_to_page(end_pfn); - - /* This gives a shorter code than deriving page_zone(end_page) */ - if (page_zone_id(start_page) != page_zone_id(end_page)) - return NULL; - - return start_page; -} - -void set_zone_contiguous(struct zone *zone) -{ - unsigned long block_start_pfn = zone->zone_start_pfn; - unsigned long block_end_pfn; - - block_end_pfn = pageblock_end_pfn(block_start_pfn); - for (; block_start_pfn < zone_end_pfn(zone); - block_start_pfn = block_end_pfn, - block_end_pfn += pageblock_nr_pages) { - - block_end_pfn = min(block_end_pfn, zone_end_pfn(zone)); - - if (!__pageblock_pfn_to_page(block_start_pfn, - block_end_pfn, zone)) - return; - cond_resched(); - } - - /* We confirm that there is no hole */ - zone->contiguous = true; -} - -void clear_zone_contiguous(struct zone *zone) -{ - zone->contiguous = false; -} - /* * The order of subdivision here is critical for the IO subsystem. * Please do not alter this order without good reasons and regression