From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758621Ab3CEPEO (ORCPT ); Tue, 5 Mar 2013 10:04:14 -0500 Received: from mail-pb0-f52.google.com ([209.85.160.52]:37008 "EHLO mail-pb0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757997Ab3CEPEK (ORCPT ); Tue, 5 Mar 2013 10:04:10 -0500 From: Jiang Liu To: Andrew Morton , David Rientjes Cc: Jiang Liu , Wen Congyang , Maciej Rutecki , Chris Clayton , "Rafael J . Wysocki" , Mel Gorman , Minchan Kim , KAMEZAWA Hiroyuki , Michal Hocko , Jianguo Wu , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v1 33/33] mm: report available pages as "MemTotal" for each NUMA node Date: Tue, 5 Mar 2013 22:55:16 +0800 Message-Id: <1362495317-32682-34-git-send-email-jiang.liu@huawei.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1362495317-32682-1-git-send-email-jiang.liu@huawei.com> References: <1362495317-32682-1-git-send-email-jiang.liu@huawei.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As reported by https://bugzilla.kernel.org/show_bug.cgi?id=53501, "MemTotal" from /proc/meminfo means memory pages managed by the buddy system (managed_pages), but "MemTotal" from /sys/.../node/nodex/meminfo means phsical pages present (present_pages) within the NUMA node. There's a difference between managed_pages and present_pages due to bootmem allocator and reserved pages. And Documentation/filesystems/proc.txt says MemTotal: Total usable ram (i.e. physical ram minus a few reserved bits and the kernel binary code) So change /sys/.../node/nodex/meminfo to report available pages within the node as "MemTotal". Signed-off-by: Jiang Liu Reported-by: sworddragon2@aol.com Cc: Andrew Morton Cc: Mel Gorman Cc: Minchan Kim Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/page_alloc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 041eb92..048c5c6 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2878,9 +2878,13 @@ EXPORT_SYMBOL(si_meminfo); #ifdef CONFIG_NUMA void si_meminfo_node(struct sysinfo *val, int nid) { + int zone_type; /* needs to be signed */ + unsigned long managed_pages = 0; pg_data_t *pgdat = NODE_DATA(nid); - val->totalram = pgdat->node_present_pages; + for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) + managed_pages += pgdat->node_zones[zone_type].managed_pages; + val->totalram = managed_pages; val->freeram = node_page_state(nid, NR_FREE_PAGES); #ifdef CONFIG_HIGHMEM val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages; -- 1.7.9.5