Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755077AbZFEI6O (ORCPT ); Fri, 5 Jun 2009 04:58:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751433AbZFEI6A (ORCPT ); Fri, 5 Jun 2009 04:58:00 -0400 Received: from acsinet11.oracle.com ([141.146.126.233]:44715 "EHLO acsinet11.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750745AbZFEI57 (ORCPT ); Fri, 5 Jun 2009 04:57:59 -0400 Message-ID: <4A28DDEB.4000409@oracle.com> Date: Fri, 05 Jun 2009 16:57:15 +0800 From: Tao Ma User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Amerigo Wang CC: Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: /proc/kcore has a unreasonable size(281474974617600) in x86_64 2.6.30-rc8. References: <4A289928.7040508@oracle.com> <20090604223805.2962e826.akpm@linux-foundation.org> <4A28C262.5020605@oracle.com> <20090605075614.GC8171@cr0.nay.redhat.com> In-Reply-To: <20090605075614.GC8171@cr0.nay.redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: abhmt003.oracle.com [141.146.116.12] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A010209.4A28DDEF.00C4:SCFSTAT5015188,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1465 Lines: 48 Amerigo Wang wrote: > On Fri, Jun 05, 2009 at 02:59:46PM +0800, Tao Ma wrote: >> >> Andrew Morton wrote: >>> On Fri, 05 Jun 2009 12:03:52 +0800 Tao Ma wrote: >>> >>>> Hi list, >>>> In 2.6.30-rc8, /proc/kcore in x86_64's size is unreasonable >>>> large to be 281474974617600. >>>> While in a x86 box, it is 931131392 which looks sane. >>>> >>>> [root@test8 ~]# ll /proc/kcore >>>> -r-------- 1 root root 281474974617600 Jun 5 11:15 /proc/kcore >>>> >>>> [root@ocfs2-test9 ~]$ ll /proc/kcore >>>> -r-------- 1 root root 931131392 Jun 5 11:58 /proc/kcore >>>> >>>> I just noticed this when kexec fails in "Can't find kernel text map >>>> area from kcore". >>>> >>>> Is there something wrong? >>>> >>> fs/proc/kcore.c hasn't changed since October last year. Was 2.6.29 OK? >>> Earlier kernels? >> with 2.6.29, ls shows the same output. >> [root@test8 ~]# ll /proc/kcore >> -r-------- 1 root root 281474974617600 Jun 5 14:35 /proc/kcore > > > Thanks. > > It looks like the value of 'high_memory' is insane.. > > Can you get its value on your machine? You can add a printk() or use > systemtap etc.. Just did that. Also a strange number. high memory 18446612137615818752. Regards, Tao -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/