linux-kernel - Re: [PATCH v2 4/5] kernel hacking: new config DEBUG

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Message-ID: <20180503134546.5p3z4g5na7ew4fun@intel.com>
Date:   Thu, 3 May 2018 21:45:46 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, changbin.du@...el.com,
        yamada.masahiro@...ionext.com, michal.lkml@...kovi.net,
        tglx@...utronix.de, mingo@...hat.com, rdunlap@...radead.org,
        x86@...nel.org, lgirdwood@...il.com, broonie@...nel.org,
        arnd@...db.de, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH v2 4/5] kernel hacking: new config DEBUG_EXPERIENCE to
 apply GCC -Og optimization

On Wed, May 02, 2018 at 09:19:56PM -0400, Steven Rostedt wrote:
> On Wed, 2 May 2018 13:45:58 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > On Wed, 2 May 2018 10:17:07 -0400 Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > > Comparison of vmlinux size: a bit smaller.
> > > > 
> > > >     w/o CONFIG_DEBUG_EXPERIENCE  
> > > 
> > > I hate the config name.
> > > 
> > > I probably can't come up with better ones but let's try:
> > > 
> > >  CONFIG_DEBUG_OPTIMIZE ?
> > >  CONFIG_OPTIMIZE_DEBUG ?
> > > 
> > > But "EXPERIENCE" sounds like I'm on some DEBUG LSD.  
> > 
> > Metoo, but the gcc people decided on "-Og: Optimize debugging
> > experience ..." and I think there are benefits if the kernel is to
> > align the naming with that.
> 
> I still see that as "Optimize debugging" and "experience" is just the
> platform of what was done.
> 
> With that gcc comment, I still think CONFIG_OPTIMIZE_DEBUG is more
> inline with what it is and understandable than
> CONFIG_DEBUG_EXPERIENCE. The "OPTIMIZE" is the key word there.
> 
> -- Steve
What about CONFIG_CC_OPTIMIZE_FOR_DEBUGGING? We alreay have
CONFIG_CC_OPTIMIZE_FOR_SIZE and CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE.

And do we need to move it to existing configuration menu "General setup->
Compiler optimization level"? But I also want it appear in "kernel hacking"
since this is a debug option.

-- 
Thanks,
Changbin Du