From patchwork Wed Dec 15 20:34:25 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?TWljaGHDheKAmiBOYXphcmV3aWN6?= X-Patchwork-Id: 414521 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oBFKfKG8029292 for ; Wed, 15 Dec 2010 20:41:21 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752948Ab0LOUil (ORCPT ); Wed, 15 Dec 2010 15:38:41 -0500 Received: from mailout4.w1.samsung.com ([210.118.77.14]:18875 "EHLO mailout4.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751240Ab0LOUij (ORCPT ); Wed, 15 Dec 2010 15:38:39 -0500 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Received: from spt2.w1.samsung.com ([210.118.77.14]) by mailout4.w1.samsung.com (Sun Java(tm) System Messaging Server 6.3-8.04 (built Jul 29 2009; 32bit)) with ESMTP id <0LDH00H0XLCD9P00@mailout4.w1.samsung.com>; Wed, 15 Dec 2010 20:38:37 +0000 (GMT) Received: from linux.samsung.com ([106.116.38.10]) by spt2.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LDH003KMLCC8J@spt2.w1.samsung.com>; Wed, 15 Dec 2010 20:38:37 +0000 (GMT) Received: from pikus.digital.local (unknown [106.116.48.169]) by linux.samsung.com (Postfix) with ESMTP id 1F1BE270054; Wed, 15 Dec 2010 21:38:13 +0100 (CET) Date: Wed, 15 Dec 2010 21:34:25 +0100 From: Michal Nazarewicz Subject: [PATCHv8 05/12] mm: alloc_contig_freed_pages() added In-reply-to: To: Michal Nazarewicz Cc: Andrew Morton , Ankita Garg , Daniel Walker , Johan MOSSBERG , KAMEZAWA Hiroyuki , Marek Szyprowski , Mel Gorman , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mm@kvack.org Message-id: <2fa6b6c1db8640cca1e8f0be7bce5d152b10c6f4.1292443200.git.m.nazarewicz@samsung.com> X-Mailer: git-send-email 1.7.2.3 References: Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Wed, 15 Dec 2010 20:41:21 +0000 (UTC) diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h index 58cdbac..f1417ed 100644 --- a/include/linux/page-isolation.h +++ b/include/linux/page-isolation.h @@ -32,6 +32,9 @@ test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn); */ extern int set_migratetype_isolate(struct page *page); extern void unset_migratetype_isolate(struct page *page); +extern unsigned long alloc_contig_freed_pages(unsigned long start, + unsigned long end, gfp_t flag); +extern void free_contig_pages(struct page *page, int nr_pages); /* * For migration. diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 826ba69..be240a3 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5425,6 +5425,50 @@ out: spin_unlock_irqrestore(&zone->lock, flags); } +unsigned long alloc_contig_freed_pages(unsigned long start, unsigned long end, + gfp_t flag) +{ + unsigned long pfn = start, count; + struct page *page; + struct zone *zone; + int order; + + VM_BUG_ON(!pfn_valid(start)); + zone = page_zone(pfn_to_page(start)); + + spin_lock_irq(&zone->lock); + + page = pfn_to_page(pfn); + for (;;) { + VM_BUG_ON(page_count(page) || !PageBuddy(page)); + list_del(&page->lru); + order = page_order(page); + zone->free_area[order].nr_free--; + rmv_page_order(page); + __mod_zone_page_state(zone, NR_FREE_PAGES, -(1UL << order)); + pfn += 1 << order; + if (pfn >= end) + break; + VM_BUG_ON(!pfn_valid(pfn)); + page += 1 << order; + } + + spin_unlock_irq(&zone->lock); + + /* After this, pages in the range can be freed one be one */ + page = pfn_to_page(start); + for (count = pfn - start; count; --count, ++page) + prep_new_page(page, 0, flag); + + return pfn; +} + +void free_contig_pages(struct page *page, int nr_pages) +{ + for (; nr_pages; --nr_pages, ++page) + __free_page(page); +} + #ifdef CONFIG_MEMORY_HOTREMOVE /* * All pages in the range must be isolated before calling this.