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 Content-Length: 1088 Lines: 29 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 -- 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/