linux-kernel - Re: [PATCH] Clarify CONFIG_DEBUG

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Message-ID: <20140204045904.GA4340@pd.tnic>
Date:	Tue, 4 Feb 2014 05:59:04 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	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, Feb 03, 2014 at 02:57:18PM -0800, Andrew Morton wrote:
> On Mon, 3 Feb 2014 14:47:15 -0800 Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> > On Mon, Feb 3, 2014 at 2:00 PM, David Rientjes <rientjes@...gle.com> 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.

Yes, this is better.

Andrew, can you add that or you want me to send a new version?

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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