Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757575AbZKRQH1 (ORCPT ); Wed, 18 Nov 2009 11:07:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757519AbZKRQH0 (ORCPT ); Wed, 18 Nov 2009 11:07:26 -0500 Received: from out01.mta.xmission.com ([166.70.13.231]:43111 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757380AbZKRQHZ (ORCPT ); Wed, 18 Nov 2009 11:07:25 -0500 To: Matt Mackall Cc: David VomLehn , dedekind1@gmail.com, Marco Stornelli , Simon Kagstrom , linux-embedded@vger.kernel.org, akpm@linux-foundation.org, dwm2@infradead.org, linux-kernel@vger.kernel.org, paul.gortmaker@windriver.com Subject: Re: [PATCH, RFC] panic-note: Annotation from user space for panics References: <1258463404.27437.103.camel@localhost> <20091117235627.GA13469@dvomlehn-lnx2.corp.sa.net> <1258505777.3081.4.camel@calx> From: ebiederm@xmission.com (Eric W. Biederman) Date: Wed, 18 Nov 2009 08:07:21 -0800 In-Reply-To: <1258505777.3081.4.camel@calx> (Matt Mackall's message of "Tue\, 17 Nov 2009 18\:56\:17 -0600") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-XM-SPF: eid=;;;mid=;;;hst=in02.mta.xmission.com;;;ip=76.21.114.89;;;frm=ebiederm@xmission.com;;;spf=neutral X-SA-Exim-Connect-IP: 76.21.114.89 X-SA-Exim-Mail-From: ebiederm@xmission.com X-SA-Exim-Version: 4.2.1 (built Thu, 25 Oct 2007 00:26:12 +0000) X-SA-Exim-Scanned: No (on in02.mta.xmission.com); Unknown failure Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 781 Lines: 19 Matt Mackall writes: > As much as I like kexec, it loses on memory footprint by about 100x. > It's not appropriate for all use cases, especially things like > consumer-grade wireless access points and phones. In general I agree. The cost of a second kernel and initrd can be prohibitive in the smallest systems, and if you do a crash capture with using a standalone app that is reinventing the wheel. That said. I can happily run kdump with only 16M-20M reserved. So on many systems the cost is affordable. Eric -- 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/