Messages in this thread | | | Date | Tue, 4 Feb 2014 10:08:25 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH] Clarify CONFIG_DEBUG_INFO's bloaty nature |
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* David Rientjes <rientjes@google.com> wrote:
> 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?
I think the right solution is what I suggested in another recent discussion:
"So to reign in debuginfo in allyesconfig/allmodconfig builds we could do something like:
config SAVE_TIME_AND_DISK_SPACE bool "Faster and leaner build object files: compile without debug info" default y
choice prompt "Choose DEBUGINFO bloat level" depends on !SAVE_TIME_AND_DISK_SPACE default DEBUG_INFO_REDUCED help This option allows to select the debuginfo model.
config DEBUG_INFO_REDUCED bool "Reduced amount of debugging information, 4x regular .o size"
config DEBUG_INFO bool "Full debuginfo, 10x regular .o size, 'planet killer' version"
endchoice
That would default to Y and would disable debuginfo by default."
Thanks,
Ingo
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