From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tim Bird Subject: Re: [PATCH, RFC] panic-note: Annotation from user space for panics Date: Wed, 18 Nov 2009 09:52:39 -0800 Message-ID: <4B043467.8000708@am.sony.com> References: <1258463404.27437.103.camel@localhost> <20091117235627.GA13469@dvomlehn-lnx2.corp.sa.net> <1258505777.3081.4.camel@calx> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" 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" 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 =============================