From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f72.google.com (mail-pa0-f72.google.com [209.85.220.72]) by kanga.kvack.org (Postfix) with ESMTP id 05AC46B025E for ; Thu, 21 Jul 2016 23:31:57 -0400 (EDT) Received: by mail-pa0-f72.google.com with SMTP id q2so172269260pap.1 for ; Thu, 21 Jul 2016 20:31:56 -0700 (PDT) Received: from szxga01-in.huawei.com (szxga01-in.huawei.com. [58.251.152.64]) by mx.google.com with ESMTPS id c10si13398877pan.75.2016.07.21.20.31.55 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 21 Jul 2016 20:31:56 -0700 (PDT) Message-ID: <579191F1.1060407@huawei.com> Date: Fri, 22 Jul 2016 11:24:33 +0800 From: zhong jiang MIME-Version: 1.0 Subject: An question about too1/vm/page-types Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: fengguang.wu@intel.com, dyoung@redhat.com, Michal Hocko , mgorman@techsingularity.net, David Rientjes , Vlastimil Babka Cc: Linux Memory Management List Hi, guys the page range from 160 to 192 corresponding to the physcial address from a0000 to bffff. That address space belongs to the PCI Bus we can get from the /proc/iomem. we konw that the region may exist valid page struct, but PG_RESERVED should be set. is right? but the actual is that page range is not any flag. I don't understand. [root@localhost vm]# ./page-types -a 160,192 flags page-count MB symbolic-flags long-symbolic-flags 0x0000000000000000 32 0 __________________________________________ total 32 0 [root@localhost vm]# cat /proc/iomem | head -n5 00000000-00000fff : reserved 00001000-0009a7ff : System RAM 0009a800-0009ffff : reserved 000a0000-000bffff : PCI Bus 0000:00 000c0000-000c7fff : Video ROM Thanks zhongjiang -- 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