linux-kernel - Re: Implement lbr-as-callgraph v10

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Date:	Wed, 19 Nov 2014 10:23:23 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Andi Kleen <andi@...stfloor.org>, Jiri Olsa <jolsa@...nel.org>,
	linux-kernel@...r.kernel.org, "Liang, Kan" <kan.liang@...el.com>
Subject: Re: Implement lbr-as-callgraph v10

On Wed, Nov 19, 2014 at 03:21:39PM +0900, Namhyung Kim wrote:
> Hi Jiri,
> 
> On Tue, 18 Nov 2014 12:00:07 +0100, Jiri Olsa wrote:
> > On Tue, Nov 18, 2014 at 11:44:16AM +0100, Jiri Olsa wrote:
> >> On Mon, Nov 17, 2014 at 06:34:57PM -0300, Arnaldo Carvalho de Melo wrote:
> >> > Em Wed, Nov 12, 2014 at 06:05:18PM -0800, Andi Kleen escreveu:
> >> > > [Reworks to address all the review feedback. Rebased to latest tree]
> >> > > [Just a repost after a rebase]
> >> > > [Even more review feedback and some bugs addressed.]
> >> > > [Only port to changes in perf/core. No other changes.]
> >> > > [Rebase to latest perf/core]
> >> > > [Another rebase. No changes]
> >> > > 
> >> > > This patchkit implements lbr-as-callgraphs in per freport,
> >> > > as an alternative way to present LBR information.
> >> > 
> >> > Ok, I have this in my perf/core branch, but I need to test it further,
> >> > as I couldn't get the output that appears on some of the changelogs.
> >> > 
> >> > If you could take a look at
> >> > 
> >> > git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux perf/core
> >> > 
> >> > To see if I made some mistake, that would be of help,
> >> > 
> >> 
> >> I'm getting compile error for DEBUG=1
> >
> > looks like the BUILD_BUG_ON_MSG does not work correctly with -O6 we use
> 
> Nope, DEBUG=1 prevents -O6 from applied.  we have below in config/Makefile:

right.. the other way around ;))

> 
>   ifndef DEBUG
>     DEBUG := 0
>   endif
> 
>   ifeq ($(DEBUG),0)
>     CFLAGS += -O6
>   endif
> 
> 
> Looking at include/linux/bug.h, BUILD_BUG_ON is guarded under
> __OPTIMIZE__ but BUILD_BUG_ON_MSG is not.  What about changing it to
> BUILD_BUG_ON then?

sounds gut

jirka
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