linux-kernel - Re: [PATCH] Clarify CONFIG_DEBUG

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Date:	Mon, 3 Feb 2014 15:34:51 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
	Richard Weinberger <richard@....at>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH] Clarify CONFIG_DEBUG_INFO's bloaty nature

On Mon, 3 Feb 2014, Andrew Morton 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.
>  

Um, I still don't think this is right since CONFIG_DEBUG_INFO_REDUCED 
requires you to say yes here and that config option actually specifies 
the tools for which it is effective.  Are you suggesting that we decouple 
CONFIG_DEBUG_INFO from CONFIG_DEBUG_INFO_REDUCED and make 
CONFIG_DEBUG_INFO select the reduced variant?  Or... what?
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