From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752713AbcDAITP (ORCPT ); Fri, 1 Apr 2016 04:19:15 -0400 Received: from mx2.suse.de ([195.135.220.15]:37566 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750952AbcDAITM (ORCPT ); Fri, 1 Apr 2016 04:19:12 -0400 Subject: Re: [PATCH v2 3/5] mm/vmstat: add zone range overlapping check To: js1304@gmail.com, Andrew Morton References: <1459476406-28418-1-git-send-email-iamjoonsoo.kim@lge.com> <1459476406-28418-4-git-send-email-iamjoonsoo.kim@lge.com> Cc: Rik van Riel , Johannes Weiner , Mel Gorman , Laura Abbott , Minchan Kim , Marek Szyprowski , Michal Nazarewicz , "Aneesh Kumar K.V" , "Rafael J. Wysocki" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim From: Vlastimil Babka Message-ID: <56FE2EFF.3070509@suse.cz> Date: Fri, 1 Apr 2016 10:19:11 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.0 MIME-Version: 1.0 In-Reply-To: <1459476406-28418-4-git-send-email-iamjoonsoo.kim@lge.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1.4.2016 4:06, js1304@gmail.com wrote: > From: Joonsoo Kim > > There is a system that node's pfn are overlapped like as following. > > -----pfn--------> > N0 N1 N2 N0 N1 N2 > > Therefore, we need to care this overlapping when iterating pfn range. > > There are two places in vmstat.c that iterates pfn range and > they don't consider this overlapping. Add it. > > Without this patch, above system could over count pageblock number > on a zone. > > Signed-off-by: Joonsoo Kim Acked-by: Vlastimil Babka