From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753417AbaBCW5V (ORCPT ); Mon, 3 Feb 2014 17:57:21 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:47152 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751268AbaBCW5U (ORCPT ); Mon, 3 Feb 2014 17:57:20 -0500 Date: Mon, 3 Feb 2014 14:57:18 -0800 From: Andrew Morton To: Linus Torvalds Cc: David Rientjes , Borislav Petkov , LKML , X86 ML , Richard Weinberger , Borislav Petkov Subject: Re: [PATCH] Clarify CONFIG_DEBUG_INFO's bloaty nature Message-Id: <20140203145718.5bc9ba1619aff8ea0754b0ab@linux-foundation.org> In-Reply-To: References: <1391452183-2160-1-git-send-email-bp@alien8.de> X-Mailer: Sylpheed 3.2.0beta5 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 3 Feb 2014 14:47:15 -0800 Linus Torvalds wrote: > On Mon, Feb 3, 2014 at 2:00 PM, David Rientjes wrote: > > > > How do you define "huge bloat" if the size of vmlinux doesn't increase? > > Don't be silly. The size of all the object files increase *hugely*. yup, I disable this in my allmodconfig testing, to great effect. That being said, I do think the text should make clear that the bloat is a compile-time impact and not a runtime one. Something like --- a/lib/Kconfig.debug~lib-kconfigdebug-clarify-config_debug_infos-bloaty-nature-fix +++ a/lib/Kconfig.debug @@ -128,9 +128,9 @@ config DEBUG_INFO tools like crash, kgdb, LKCD, gdb, etc on the kernel. If you only want to have resolved symbols in kernel traces and - are not going to need support for those tools above, you don't need - to enable this as it is a huge bloat and build slowdown; - enable CONFIG_KALLSYMS instead. + are not going to need support for the above tools, you don't need + to enable this. It hugely bloat object files' on-disk sizes and slows + the build. Enable CONFIG_KALLSYMS instead. If unsure, say N. _