From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f51.google.com (mail-pa0-f51.google.com [209.85.220.51]) by kanga.kvack.org (Postfix) with ESMTP id 69F6B6B006E for ; Thu, 12 Feb 2015 02:30:18 -0500 (EST) Received: by mail-pa0-f51.google.com with SMTP id eu11so9577092pac.10 for ; Wed, 11 Feb 2015 23:30:18 -0800 (PST) Received: from lgemrelse7q.lge.com (LGEMRELSE7Q.lge.com. [156.147.1.151]) by mx.google.com with ESMTP id zc5si3998485pbc.76.2015.02.11.23.30.10 for ; Wed, 11 Feb 2015 23:30:11 -0800 (PST) From: 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> 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: owner-linux-mm@kvack.org List-ID: 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 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org