LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Du, Changbin" <changbin.du@intel.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: changbin.du@intel.com, yamada.masahiro@socionext.com,
	michal.lkml@markovi.net, tglx@linutronix.de, mingo@redhat.com,
	akpm@linux-foundation.org, x86@kernel.org, lgirdwood@gmail.com,
	broonie@kernel.org, arnd@arndb.de, linux-kbuild@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH 4/5] kernel hacking: new config DEBUG_EXPERIENCE to apply GCC -Og optimization
Date: Wed, 2 May 2018 17:24:58 +0800	[thread overview]
Message-ID: <20180502092458.zss44oqy7fqsyszp@intel.com> (raw)
In-Reply-To: <f19eae29-3b94-5151-04c5-6fb620bd28e9@infradead.org>

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

  reply	other threads:[~2018-05-02  9:35 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-01 13:00 [PATCH 0/5] kernel hacking: GCC optimization for debug experience (-Og) changbin.du
2018-05-01 13:00 ` [PATCH 1/5] x86/mm: surround level4_kernel_pgt with #ifdef CONFIG_X86_5LEVEL...#endif changbin.du
2018-05-01 13:00 ` [PATCH 2/5] regulator: add dummy of_find_regulator_by_node changbin.du
2018-05-01 20:40   ` Mark Brown
2018-05-02  9:24     ` Du, Changbin
2018-05-05  1:44   ` Applied "regulator: add dummy function of_find_regulator_by_node" to the regulator tree Mark Brown
2018-05-01 13:00 ` [PATCH 3/5] kernel hacking: new config NO_AUTO_INLINE to disable compiler atuo-inline optimizations changbin.du
2018-05-01 14:54   ` Steven Rostedt
2018-05-02  9:27     ` Du, Changbin
2018-05-01 13:00 ` [PATCH 4/5] kernel hacking: new config DEBUG_EXPERIENCE to apply GCC -Og optimization changbin.du
2018-05-01 15:25   ` Randy Dunlap
2018-05-02  9:24     ` Du, Changbin [this message]
2018-05-02 20:30   ` Arnd Bergmann
2018-05-01 13:00 ` [PATCH 5/5] asm-generic: fix build error in fix_to_virt with CONFIG_DEBUG_EXPERIENCE changbin.du
2018-05-02  7:33 ` [PATCH 0/5] kernel hacking: GCC optimization for debug experience (-Og) Ingo Molnar
2018-05-02  9:07   ` Du, Changbin
2018-05-02 11:09     ` Ingo Molnar

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180502092458.zss44oqy7fqsyszp@intel.com \
    --to=changbin.du@intel.com \
    --cc=akpm@linux-foundation.org \
    --cc=arnd@arndb.de \
    --cc=broonie@kernel.org \
    --cc=lgirdwood@gmail.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-kbuild@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=michal.lkml@markovi.net \
    --cc=mingo@redhat.com \
    --cc=rdunlap@infradead.org \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    --cc=yamada.masahiro@socionext.com \
    --subject='Re: [PATCH 4/5] kernel hacking: new config DEBUG_EXPERIENCE to apply GCC -Og optimization' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).