From patchwork Fri Nov 19 15:58:07 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: 340211 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 oAJG1UMM029063 for ; Fri, 19 Nov 2010 16:01:31 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755455Ab0KSP7r (ORCPT ); Fri, 19 Nov 2010 10:59:47 -0500 Received: from mailout2.w1.samsung.com ([210.118.77.12]:25566 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755406Ab0KSP6b (ORCPT ); Fri, 19 Nov 2010 10:58:31 -0500 Received: from eu_spt1 (mailout2.w1.samsung.com [210.118.77.12]) by mailout2.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTP id <0LC500GIH31EPH@mailout2.w1.samsung.com>; Fri, 19 Nov 2010 15:58:26 +0000 (GMT) Received: from linux.samsung.com ([106.116.38.10]) by spt1.w1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LC500AX831DPP@spt1.w1.samsung.com>; Fri, 19 Nov 2010 15:58:26 +0000 (GMT) Received: from pikus.digital.local (unknown [106.116.48.169]) by linux.samsung.com (Postfix) with ESMTP id 375CF2700F1; Fri, 19 Nov 2010 16:58:23 +0100 (CET) Date: Fri, 19 Nov 2010 16:58:07 +0100 From: Michal Nazarewicz Subject: [RFCv6 09/13] mm: alloc_contig_free_pages() added In-reply-to: To: mina86@mina86.com Cc: Andrew Morton , Ankita Garg , Bryan Huntsman , Daniel Walker , FUJITA Tomonori , Hans Verkuil , Johan Mossberg , Jonathan Corbet , KAMEZAWA Hiroyuki , Konrad Rzeszutek Wilk , Marcus LORENTZON , Marek Szyprowski , Mark Brown , Mel Gorman , Pawel Osciak , Russell King , Vaidyanathan Srinivasan , Zach Pfeffer , dipankar@in.ibm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mm@kvack.org Message-id: MIME-version: 1.0 X-Mailer: git-send-email 1.7.2.3 Content-type: TEXT/PLAIN Content-transfer-encoding: 7BIT 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]); Fri, 19 Nov 2010 16:01:31 +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 07a6544..6dd2854 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5424,6 +5424,48 @@ 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(pfn)); + page = pfn_to_page(pfn); + + zone = page_zone(page); + spin_lock_irq(&zone->lock); + 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.