From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756014Ab3EXQrA (ORCPT ); Fri, 24 May 2013 12:47:00 -0400 Received: from e06smtp15.uk.ibm.com ([195.75.94.111]:35627 "EHLO e06smtp15.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753341Ab3EXQq7 (ORCPT ); Fri, 24 May 2013 12:46:59 -0400 Date: Fri, 24 May 2013 18:46:53 +0200 From: Michael Holzheu To: Vivek Goyal Cc: HATAYAMA Daisuke , Jan Willeke , Martin Schwidefsky , Heiko Carstens , linux-kernel@vger.kernel.org, kexec@lists.infradead.org, Andrew Morton , "Eric W. Biederman" Subject: Re: [PATCH 0/2] kdump/mmap: Fix mmap of /proc/vmcore for s390 Message-ID: <20130524184653.52d75b5f@holzheu> In-Reply-To: <20130524152849.GF18218@redhat.com> References: <1369400889-11064-1-git-send-email-holzheu@linux.vnet.ibm.com> <20130524143644.GD18218@redhat.com> <20130524170626.2ac06efe@holzheu> <20130524152849.GF18218@redhat.com> Organization: IBM X-Mailer: Claws Mail 3.8.0 (GTK+ 2.24.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13052416-0342-0000-0000-00000521053D Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 24 May 2013 11:28:49 -0400 Vivek Goyal wrote: > On Fri, May 24, 2013 at 05:06:26PM +0200, Michael Holzheu wrote: [snip] > As /proc/vmcore is the most used and useful interface, I prefer that > we swap memory and put that info in elf headers. For /dev/oldme, I > don't mind if we leave it as it is. If somebody really cares, then > I guess we need to write a new command line option which /dev/mem > can parse and which tells it about swaps so that /dev/oldmem can > map things correctly. (This is better than hardcoding things). Besides of the potential /dev/oldmem issue, I still do not understand the option of doing the swap in the elf header. Looks like I missed here a fundamental design point of kdump :( Is that done by specifying different virtual and physical addresses in the ELF header? Michael From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from e06smtp17.uk.ibm.com ([195.75.94.113]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Ufv9F-0003NQ-AB for kexec@lists.infradead.org; Fri, 24 May 2013 16:47:22 +0000 Received: from /spool/local by e06smtp17.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 24 May 2013 17:43:37 +0100 Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by d06dlp03.portsmouth.uk.ibm.com (Postfix) with ESMTP id 328FF1B08023 for ; Fri, 24 May 2013 17:46:55 +0100 (BST) Received: from d06av06.portsmouth.uk.ibm.com (d06av06.portsmouth.uk.ibm.com [9.149.37.217]) by b06cxnps4074.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r4OGkivJ53084240 for ; Fri, 24 May 2013 16:46:44 GMT Received: from d06av06.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av06.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id r4OGks7c003621 for ; Fri, 24 May 2013 10:46:54 -0600 Date: Fri, 24 May 2013 18:46:53 +0200 From: Michael Holzheu Subject: Re: [PATCH 0/2] kdump/mmap: Fix mmap of /proc/vmcore for s390 Message-ID: <20130524184653.52d75b5f@holzheu> In-Reply-To: <20130524152849.GF18218@redhat.com> References: <1369400889-11064-1-git-send-email-holzheu@linux.vnet.ibm.com> <20130524143644.GD18218@redhat.com> <20130524170626.2ac06efe@holzheu> <20130524152849.GF18218@redhat.com> Mime-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: Vivek Goyal Cc: Heiko Carstens , kexec@lists.infradead.org, Jan Willeke , linux-kernel@vger.kernel.org, HATAYAMA Daisuke , "Eric W. Biederman" , Martin Schwidefsky , Andrew Morton On Fri, 24 May 2013 11:28:49 -0400 Vivek Goyal wrote: > On Fri, May 24, 2013 at 05:06:26PM +0200, Michael Holzheu wrote: [snip] > As /proc/vmcore is the most used and useful interface, I prefer that > we swap memory and put that info in elf headers. For /dev/oldme, I > don't mind if we leave it as it is. If somebody really cares, then > I guess we need to write a new command line option which /dev/mem > can parse and which tells it about swaps so that /dev/oldmem can > map things correctly. (This is better than hardcoding things). Besides of the potential /dev/oldmem issue, I still do not understand the option of doing the swap in the elf header. Looks like I missed here a fundamental design point of kdump :( Is that done by specifying different virtual and physical addresses in the ELF header? Michael _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec