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Fri, 12 Nov 2021 15:09:08 +0000 From: Joao Martins To: linux-mm@kvack.org Cc: Dan Williams , Vishal Verma , Dave Jiang , Naoya Horiguchi , Matthew Wilcox , Jason Gunthorpe , John Hubbard , Jane Chu , Muchun Song , Mike Kravetz , Andrew Morton , Jonathan Corbet , Christoph Hellwig , nvdimm@lists.linux.dev, linux-doc@vger.kernel.org, Joao Martins Subject: [PATCH v5 3/8] mm/page_alloc: refactor memmap_init_zone_device() page init Date: Fri, 12 Nov 2021 16:08:19 +0100 Message-Id: <20211112150824.11028-4-joao.m.martins@oracle.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20211112150824.11028-1-joao.m.martins@oracle.com> References: <20211112150824.11028-1-joao.m.martins@oracle.com> X-ClientProxiedBy: AM3PR07CA0134.eurprd07.prod.outlook.com (2603:10a6:207:8::20) To BLAPR10MB4835.namprd10.prod.outlook.com (2603:10b6:208:331::11) MIME-Version: 1.0 Received: from paddy.uk.oracle.com (138.3.204.9) by AM3PR07CA0134.eurprd07.prod.outlook.com (2603:10a6:207:8::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.4690.12 via Frontend Transport; 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dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b="Hs/NHMbJ"; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=nZG7gp2A; spf=none (imf10.hostedemail.com: domain of joao.m.martins@oracle.com has no SPF policy when checking 205.220.177.32) smtp.mailfrom=joao.m.martins@oracle.com; dmarc=pass (policy=none) header.from=oracle.com X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2A86D6001986 X-Stat-Signature: okbhzaespj4ho9z48rr99ajp4fu3dajy X-HE-Tag: 1636729745-243942 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Move struct page init to an helper function __init_zone_device_page(). This is in preparation for sharing the storage for compound page metadata. Signed-off-by: Joao Martins Reviewed-by: Dan Williams --- mm/page_alloc.c | 74 +++++++++++++++++++++++++++---------------------- 1 file changed, 41 insertions(+), 33 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 20b9db0cf97c..23045a2a1339 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6572,6 +6572,46 @@ void __meminit memmap_init_range(unsigned long size, int nid, unsigned long zone } #ifdef CONFIG_ZONE_DEVICE +static void __ref __init_zone_device_page(struct page *page, unsigned long pfn, + unsigned long zone_idx, int nid, + struct dev_pagemap *pgmap) +{ + + __init_single_page(page, pfn, zone_idx, nid); + + /* + * Mark page reserved as it will need to wait for onlining + * phase for it to be fully associated with a zone. + * + * We can use the non-atomic __set_bit operation for setting + * the flag as we are still initializing the pages. + */ + __SetPageReserved(page); + + /* + * ZONE_DEVICE pages union ->lru with a ->pgmap back pointer + * and zone_device_data. It is a bug if a ZONE_DEVICE page is + * ever freed or placed on a driver-private list. + */ + page->pgmap = pgmap; + page->zone_device_data = NULL; + + /* + * Mark the block movable so that blocks are reserved for + * movable at startup. This will force kernel allocations + * to reserve their blocks rather than leaking throughout + * the address space during boot when many long-lived + * kernel allocations are made. + * + * Please note that MEMINIT_HOTPLUG path doesn't clear memmap + * because this is done early in section_activate() + */ + if (IS_ALIGNED(pfn, pageblock_nr_pages)) { + set_pageblock_migratetype(page, MIGRATE_MOVABLE); + cond_resched(); + } +} + void __ref memmap_init_zone_device(struct zone *zone, unsigned long start_pfn, unsigned long nr_pages, @@ -6600,39 +6640,7 @@ void __ref memmap_init_zone_device(struct zone *zone, for (pfn = start_pfn; pfn < end_pfn; pfn++) { struct page *page = pfn_to_page(pfn); - __init_single_page(page, pfn, zone_idx, nid); - - /* - * Mark page reserved as it will need to wait for onlining - * phase for it to be fully associated with a zone. - * - * We can use the non-atomic __set_bit operation for setting - * the flag as we are still initializing the pages. - */ - __SetPageReserved(page); - - /* - * ZONE_DEVICE pages union ->lru with a ->pgmap back pointer - * and zone_device_data. It is a bug if a ZONE_DEVICE page is - * ever freed or placed on a driver-private list. - */ - page->pgmap = pgmap; - page->zone_device_data = NULL; - - /* - * Mark the block movable so that blocks are reserved for - * movable at startup. This will force kernel allocations - * to reserve their blocks rather than leaking throughout - * the address space during boot when many long-lived - * kernel allocations are made. - * - * Please note that MEMINIT_HOTPLUG path doesn't clear memmap - * because this is done early in section_activate() - */ - if (IS_ALIGNED(pfn, pageblock_nr_pages)) { - set_pageblock_migratetype(page, MIGRATE_MOVABLE); - cond_resched(); - } + __init_zone_device_page(page, pfn, zone_idx, nid, pgmap); } pr_info("%s initialised %lu pages in %ums\n", __func__,