Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758143AbZKRRxB (ORCPT ); Wed, 18 Nov 2009 12:53:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758064AbZKRRxA (ORCPT ); Wed, 18 Nov 2009 12:53:00 -0500 Received: from va3ehsobe001.messaging.microsoft.com ([216.32.180.11]:12324 "EHLO VA3EHSOBE001.bigfish.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757991AbZKRRw7 (ORCPT ); Wed, 18 Nov 2009 12:52:59 -0500 X-SpamScore: -16 X-BigFish: VPS-16(zz1432R98dNzz1202hzzz2fh6bh61h) X-Spam-TCS-SCL: 0:0 Message-ID: <4B043467.8000708@am.sony.com> Date: Wed, 18 Nov 2009 09:52:39 -0800 From: Tim Bird User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: "Eric W. Biederman" CC: Matt Mackall , 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> In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 18 Nov 2009 17:52:40.0667 (UTC) FILETIME=[EC336AB0:01CA6877] X-Reverse-DNS: mail7.fw-bc.sony.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1163 Lines: 30 Eric W. Biederman wrote: > 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. Understood. On some of my systems, the memory budget for the entire system is 10M. On most systems I work with, it is a struggle to reserve even 64K for this feature. -- Tim ============================= Tim Bird Architecture Group Chair, CE Linux Forum Senior Staff Engineer, Sony Corporation of America ============================= -- 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/