Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755111AbbBLHdz (ORCPT ); Thu, 12 Feb 2015 02:33:55 -0500 Received: from LGEMRELSE7Q.lge.com ([156.147.1.151]:41894 "EHLO lgemrelse7q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754972AbbBLHaL (ORCPT ); Thu, 12 Feb 2015 02:30:11 -0500 X-Original-SENDERIP: 10.177.222.153 X-Original-MAILFROM: iamjoonsoo.kim@lge.com From: Joonsoo Kim To: Andrew Morton Cc: Rik van Riel , Johannes Weiner , Mel Gorman , Laura Abbott , Minchan Kim , Heesub Shin , Marek Szyprowski , Michal Nazarewicz , "Aneesh Kumar K.V" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hui Zhu , Gioh Kim , Bartlomiej Zolnierkiewicz , Ritesh Harjani , Vlastimil Babka , Joonsoo Kim Subject: [RFC 06/16] mm/page_alloc: watch out zone range overlap Date: Thu, 12 Feb 2015 16:32:10 +0900 Message-Id: <1423726340-4084-7-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1423726340-4084-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1423726340-4084-1-git-send-email-iamjoonsoo.kim@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1354 Lines: 38 In the following patches, new zone, ZONE_CMA, will be introduced and it would be overlapped with other zones. Currently, many places iterating pfn range doesn't consider possibility of zone overlap and this would cause a problem such as printing wrong statistics information. To prevent this situation, this patch add some code to consider zone overlapping before adding ZONE_CMA. setup_zone_migrate_reserve() reserve some pages for specific zone so should consider zone overlap. Signed-off-by: Joonsoo Kim --- mm/page_alloc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c784035..1c45934b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4040,8 +4040,8 @@ static void setup_zone_migrate_reserve(struct zone *zone) continue; page = pfn_to_page(pfn); - /* Watch out for overlapping nodes */ - if (page_to_nid(page) != zone_to_nid(zone)) + /* Watch out for overlapping zones */ + if (page_zone(page) != zone) continue; block_migratetype = get_pageblock_migratetype(page); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/