linux-kernel - Re: [patch 2/6] Linux Kernel Markers - Add kconfig menus for the marker code

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Date:	Wed, 12 Sep 2007 10:54:08 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Adrian Bunk <bunk@...sta.de>
Subject: Re: [patch 2/6] Linux Kernel Markers - Add kconfig menus for the marker code

* Randy Dunlap (randy.dunlap@...cle.com) wrote:
> On Thu, 06 Sep 2007 16:07:35 -0400 Mathieu Desnoyers wrote:
> 
> [snip]
> 
> > This patch:
> > 
> > Add Kconfig menus for the marker code.
> > 
> > [bunk@...sta.de: Never ever select MODULES]
> > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> > Reviewed-by: Christoph Hellwig <hch@...radead.org>
> > Reviewed-by: "Frank Ch. Eigler" <fche@...hat.com>
> > CC: Adrian Bunk <bunk@...sta.de>
> > ---
> > 
> >  arch/alpha/Kconfig       |    2 ++
> >  arch/arm/Kconfig         |    2 ++
> >  arch/avr32/Kconfig.debug |    7 +++++++
> >  arch/cris/Kconfig        |    2 ++
> >  arch/frv/Kconfig         |    2 ++
> >  arch/h8300/Kconfig       |    2 ++
> >  arch/i386/Kconfig        |    2 ++
> >  arch/ia64/Kconfig        |    2 ++
> >  arch/m32r/Kconfig        |    2 ++
> >  arch/m68k/Kconfig        |    2 ++
> >  arch/m68knommu/Kconfig   |    2 ++
> >  arch/mips/Kconfig        |    2 ++
> >  arch/parisc/Kconfig      |    2 ++
> >  arch/powerpc/Kconfig     |    2 ++
> >  arch/ppc/Kconfig         |    2 ++
> >  arch/s390/Kconfig        |    2 ++
> >  arch/sh/Kconfig          |    2 ++
> >  arch/sh64/Kconfig        |    2 ++
> >  arch/sparc/Kconfig       |    2 ++
> >  arch/sparc64/Kconfig     |    2 ++
> >  arch/um/Kconfig          |    2 ++
> >  arch/v850/Kconfig        |    2 ++
> >  arch/x86_64/Kconfig      |    2 ++
> >  arch/xtensa/Kconfig      |    2 ++
> >  kernel/Kconfig.marker    |    7 +++++++
> >  kernel/Makefile          |    1 +
> >  26 files changed, 61 insertions(+)
> > 
> > Index: linux-2.6-lttng/arch/alpha/Kconfig
> > ===================================================================
> > --- linux-2.6-lttng.orig/arch/alpha/Kconfig	2007-09-04 12:14:48.000000000 -0400
> > +++ linux-2.6-lttng/arch/alpha/Kconfig	2007-09-04 12:16:57.000000000 -0400
> > @@ -646,6 +646,8 @@ config SRM_ENV
> >  
> >  source "fs/Kconfig.binfmt"
> >  
> > +source "kernel/Kconfig.marker"
> > +
> >  endmenu
> >  
> >  source "net/Kconfig"
> > Index: linux-2.6-lttng/kernel/Kconfig.marker
> > ===================================================================
> > --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> > +++ linux-2.6-lttng/kernel/Kconfig.marker	2007-09-04 12:16:57.000000000 -0400
> > @@ -0,0 +1,7 @@
> > +# Code markers configuration
> > +
> > +config MARKERS
> > +	bool "Activate markers"
> > +	help
> > +	  Place an empty function call at each marker site. Can be
> > +	  dynamically changed for a probe function.
> > Index: linux-2.6-lttng/arch/avr32/Kconfig.debug
> > ===================================================================
> > --- linux-2.6-lttng.orig/arch/avr32/Kconfig.debug	2007-09-04 12:14:49.000000000 -0400
> > +++ linux-2.6-lttng/arch/avr32/Kconfig.debug	2007-09-04 12:16:57.000000000 -0400
> > @@ -6,6 +6,9 @@ config TRACE_IRQFLAGS_SUPPORT
> >  
> >  source "lib/Kconfig.debug"
> >  
> > +menu "Instrumentation Support"
> > +	depends on EXPERIMENTAL
> > +
> >  config KPROBES
> >  	bool "Kprobes"
> >  	depends on DEBUG_KERNEL
> > @@ -16,4 +19,8 @@ config KPROBES
> >            for kernel debugging, non-intrusive instrumentation and testing.
> >            If in doubt, say "N".
> >  
> > +source "kernel/Kconfig.marker"
> > +
> > +endmenu
> > +
> >  endmenu
> 
> It seems sad that this patch sources Kconfig.marker, a 7-line file,
> 20-something times.  Yes, you (we) don't want to put those 7 lines
> into 20-something different files, so sourcing is the right thing.
> 
> However, what you did for avr32 seems more on the right track to me:
> make _one_ Instrumentation support menu that includes PROFILING,
> OPROFILE, KPROBES, and MARKERS and then use (source) that in all
> of the arches.
> 

Ok, it will be in my next post.

Mathieu

> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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