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

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Date:	Sun, 25 Jan 2015 22:50:10 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.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

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/

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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