Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755183AbcCNHcb (ORCPT ); Mon, 14 Mar 2016 03:32:31 -0400 Received: from mail-pa0-f68.google.com ([209.85.220.68]:33677 "EHLO mail-pa0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755120AbcCNHcH (ORCPT ); Mon, 14 Mar 2016 03:32:07 -0400 From: js1304@gmail.com X-Google-Original-From: iamjoonsoo.kim@lge.com To: Andrew Morton Cc: Rik van Riel , Johannes Weiner , Mel Gorman , Laura Abbott , Minchan Kim , Marek Szyprowski , Michal Nazarewicz , "Aneesh Kumar K.V" , Vlastimil Babka , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Rafael J. Wysocki" , Joonsoo Kim Subject: [PATCH 4/6] mm/vmstat: add zone range overlapping check Date: Mon, 14 Mar 2016 16:31:35 +0900 Message-Id: <1457940697-2278-5-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1457940697-2278-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1457940697-2278-1-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: 1184 Lines: 47 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 --- mm/vmstat.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/vmstat.c b/mm/vmstat.c index 5e43004..0a726e3 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1010,6 +1010,9 @@ static void pagetypeinfo_showblockcount_print(struct seq_file *m, if (!memmap_valid_within(pfn, page, zone)) continue; + if (page_zone(page) != zone) + continue; + mtype = get_pageblock_migratetype(page); if (mtype < MIGRATE_TYPES) @@ -1076,6 +1079,10 @@ static void pagetypeinfo_showmixedcount_print(struct seq_file *m, continue; page = pfn_to_page(pfn); + + if (page_zone(page) != zone) + continue; + if (PageBuddy(page)) { pfn += (1UL << page_order(page)) - 1; continue; -- 1.9.1