From mboxrd@z Thu Jan 1 00:00:00 1970 From: ebiederm@xmission.com (Eric W. Biederman) Subject: Re: [PATCH, RFC] panic-note: Annotation from user space for panics Date: Wed, 18 Nov 2009 08:07:21 -0800 Message-ID: References: <1258463404.27437.103.camel@localhost> <20091117235627.GA13469@dvomlehn-lnx2.corp.sa.net> <1258505777.3081.4.camel@calx> Mime-Version: 1.0 Return-path: In-Reply-To: <1258505777.3081.4.camel@calx> (Matt Mackall's message of "Tue\, 17 Nov 2009 18\:56\:17 -0600") Sender: linux-embedded-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 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