From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44229) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W458f-0005ts-Gs for qemu-devel@nongnu.org; Fri, 17 Jan 2014 03:51:00 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1W458V-000506-J2 for qemu-devel@nongnu.org; Fri, 17 Jan 2014 03:50:53 -0500 Received: from e06smtp10.uk.ibm.com ([195.75.94.106]:42641) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W458V-0004zN-8w for qemu-devel@nongnu.org; Fri, 17 Jan 2014 03:50:43 -0500 Received: from /spool/local by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 17 Jan 2014 08:50:40 -0000 Received: from b06cxnps3075.portsmouth.uk.ibm.com (d06relay10.portsmouth.uk.ibm.com [9.149.109.195]) by d06dlp02.portsmouth.uk.ibm.com (Postfix) with ESMTP id 984482190059 for ; Fri, 17 Jan 2014 08:50:36 +0000 (GMT) Received: from d06av07.portsmouth.uk.ibm.com (d06av07.portsmouth.uk.ibm.com [9.149.37.248]) by b06cxnps3075.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s0H8oPME58065126 for ; Fri, 17 Jan 2014 08:50:26 GMT Received: from d06av07.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av07.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s0H8obcb020629 for ; Fri, 17 Jan 2014 03:50:37 -0500 Message-ID: <52D8EEDC.2090108@de.ibm.com> Date: Fri, 17 Jan 2014 09:50:36 +0100 From: Christian Borntraeger MIME-Version: 1.0 References: <1389944779-31899-1-git-send-email-qiaonuohan@cn.fujitsu.com> In-Reply-To: <1389944779-31899-1-git-send-email-qiaonuohan@cn.fujitsu.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 00/13 v7] Make 'dump-guest-memory' dump in kdump-compressed format List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qiaonuohan , lersek@redhat.com, stefanha@gmail.com, lcapitulino@redhat.com, afaerber@suse.de, eblake@redhat.com Cc: anderson@redhat.com, Ekaterina Tumanova , kumagai-atsushi@mxc.nes.nec.co.jp, qemu-devel@nongnu.org On 17/01/14 08:46, qiaonuohan wrote: > Hi, all > > The last version is here: > http://lists.nongnu.org/archive/html/qemu-devel/2014-01/msg00209.html > > Command 'dump-guest-memory' was introduced to dump guest's memory. But the > vmcore's format is only elf32 or elf64. The message is here: > http://lists.gnu.org/archive/html/qemu-devel/2012-04/msg03379.html > > Compared with migration, the missing of compression feature means regression > to 'dump-guest-memory'. So we post these patches to make 'dump-guest-memory' be > able to dump guest's in kdump-compressed format. Then vmcore can be much > smaller, and easily to be delivered. Nice, we certainly want that. > > The kdump-compressed format is *linux specific* *linux standard* crash dump > format used in kdump framework. The kdump-compressed format is readable only > with the crash utility, and it can be smaller than the ELF format because of > the compression support. To get more detailed information about > kdump-compressed format, please refer to the following URL: > http://sourceforge.net/projects/makedumpfile/ > > Note, similar to 'dump-guest-memory': > 1. The guest should be x86 or x86_64. The other arch is not supported now. What is the reason for that? Looking over the patch set, there seem to be no architecture folder involved and others like s390x also have the dump-guest-memory support. [...]