linux-kernel - Re: [PATCHSET 00/17] perf tools: Introduce new 'ftrace' command (v4)

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Message-ID: <20130802091659.GB26693@gmail.com>
Date:	Fri, 2 Aug 2013 11:16:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Jeremy Eder <jeder@...hat.com>
Subject: Re: [PATCHSET 00/17] perf tools: Introduce new 'ftrace' command (v4)


* Jiri Olsa <jolsa@...hat.com> wrote:

> On Tue, Jul 30, 2013 at 06:18:57PM +0900, Namhyung Kim wrote:
> > This patchset implements a front-end tool for kernel's ftrace.  It
> > uses function_graph tracer by default and normal function tracer is
> > also supported.  (Of course you need to enable those tracers in your
> > kernel first.)
> > 
> > v4 changes:
> >  * use pid instead of tid for -p option (David)
> >  * not to poll() for reading ftrace pipes (Jiri)
> >  * rename to create_perf_header() (Jiri)
> >  * canonicalize directory name (Jiri)
> >  * show more info when -D option was given (Jiri)
> >  * update documentation (Jiri)
> >  * and few more bug fixes
> > 
> > I pushed it out to 'perf/ftrace-v4' branch on my tree at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
> > 
> > 
> > Any comments are welcome, thanks,
> > Namhyung
> 
> hi,
> I've got following error when compiling on Fedora 16:
> 
>         CC builtin-ftrace.o
>     builtin-ftrace.c: In function ???set_tracing_clock???:
>     builtin-ftrace.c:197:14: error: declaration of ???clock??? shadows a global declaration [-Werror=shadow]
>     builtin-ftrace.c: In function ???canonicalize_directory_name???:
>     builtin-ftrace.c:350:53: error: declaration of ???dirname??? shadows a global declaration [-Werror=shadow]
>     cc1: all warnings being treated as errors
> 
> Fedora 17 seems to be ok.. strange ;-)

Might be due to:

   /usr/include/time.h:extern clock_t clock (void) __THROW;

which is a sad namespace land-grab by time.h, 'clock' is such a nice local 
variable name.

Thanks,

	Ingo
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