linux-kernel - Re: [PATCH 5/5] perf: Make perf aware of tracefs

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Date:	Sun, 25 Jan 2015 14:19:54 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH 5/5] perf: Make perf aware of tracefs

On Sun, 25 Jan 2015 22:50:10 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> Hi Steve,
> 
> On Sat, Jan 24, 2015 at 01:13:35PM -0500, Steven Rostedt wrote:
> > From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> > 
> > As tracefs may be mounted instead of debugfs to get to the event directories,
> > have perf know about tracefs, and use that file system over debugfs if it
> > is present.
> > 
> > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> > ---
> >  const char *find_tracing_dir(void)
> >  {
> > +	const char *tracing_dir = "";
> >  	static char *tracing;
> >  	static int tracing_found;
> >  	const char *debugfs;
> > @@ -351,11 +385,15 @@ const char *find_tracing_dir(void)
> >  	if (tracing_found)
> >  		return tracing;
> >  
> > -	debugfs = find_debugfs();
> > -	if (!debugfs)
> > -		return NULL;
> > +	debugfs = find_tracefs();
> > +	if (!debugfs) {
> > +		tracing_dir = "/tracing";
> > +		debugfs = find_debugfs();
> > +		if (!debugfs)
> > +			return NULL;
> > +	}
> >  
> > -	if (asprintf(&tracing, "%s/tracing", debugfs) < 0)
> > +	if (asprintf(&tracing, "%s%s", tracing_dir, debugfs) < 0)
> 
> s/tracing_dir, debugfs/debugfs, tracing_dir/

Hmm, I wonder how I missed this during testing. Ah, I think it broke on
tracefs, so I added this, but never tested it again without tracefs.

Thanks, will fix.

-- Steve

> 
> Thanks,
> Namhyung
> 
> 
> >  		return NULL;
> >  
> >  	tracing_found = 1;
> > diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
> > index 027a5153495c..73c2f8e557ab 100644
> > --- a/tools/perf/util/util.h
> > +++ b/tools/perf/util/util.h
> > @@ -75,6 +75,7 @@
> >  #include <linux/types.h>
> >  #include <sys/ttydefaults.h>
> >  #include <api/fs/debugfs.h>
> > +#include <api/fs/tracefs.h>
> >  #include <termios.h>
> >  #include <linux/bitops.h>
> >  #include <termios.h>
> > -- 
> > 2.1.4
> > 
> > 

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