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SubjectRe: [PATCH 4/5] kernel hacking: new config DEBUG_EXPERIENCE to apply GCC -Og optimization
On Tue, May 01, 2018 at 08:25:27AM -0700, Randy Dunlap wrote:
> Good morning.
>
> On 05/01/2018 06:00 AM, changbin.du@intel.com wrote:
> > From: Changbin Du <changbin.du@intel.com>
> >
> >
> > Signed-off-by: Changbin Du <changbin.du@intel.com>
> > ---
> > Makefile | 4 ++++
> > include/linux/compiler-gcc.h | 2 +-
> > include/linux/compiler.h | 2 +-
> > lib/Kconfig.debug | 21 +++++++++++++++++++++
> > 4 files changed, 27 insertions(+), 2 deletions(-)
> >
>
> > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> > index 90f35ad..2432e77d 100644
> > --- a/lib/Kconfig.debug
> > +++ b/lib/Kconfig.debug
> > @@ -211,6 +211,27 @@ config NO_AUTO_INLINE
> >
> > Use only if you want to debug the kernel.
> >
> > +config DEBUG_EXPERIENCE
> > + bool "Optimize for better debugging experience (-Og)"
> > + default n
> > + select NO_AUTO_INLINE
> > + depends on !CC_OPTIMIZE_FOR_SIZE
> > + help
> > + This will apply GCC '-Og' optimization level get supported from
>
> which is supported since
>
> > + GCC 4.8. This optimization level offers a reasonable level of
> > + optimization while maintaining fast compilation and a good
> > + debugging experience. It is similar to '-O1' while perfer keeping
>
> while preferring to keep
>
> > + debug ability over runtime speed. The overall performance will
> > + drop a bit.
> > +
> > + If enabling this option break your kernel, you should either
>
> breaks
>
> > + disable this or find a fix (mostly in the arch code). Currently
> > + this option has only be tested in qemu x86_64 guest.
> > +
> > + Use only if you want to debug the kernel, especially if you want
> > + to have better kernel debugging experience with gdb facilities
> > + like kgdb and qemu.
> > +
> > config ENABLE_WARN_DEPRECATED
> > bool "Enable __deprecated logic"
> > default y
> >
>
> thanks,
> --
> ~Randy

Thanks for your correction, I will update.

--
Thanks,
Changbin Du

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