linux-kernel - Re: [PATCH -v2] perf: Don't list tracepoints without an id

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Message-ID: <20090806193349.GA2666@redhat.com>
Date:	Thu, 6 Aug 2009 15:33:49 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Chris Mason <chris.mason@...cle.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v2] perf: Don't list tracepoints without an id

On Thu, Aug 06, 2009 at 04:48:54PM +0200, Peter Zijlstra wrote:
> Stop perf list from displaying tracepoints without an id file.
> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  tools/perf/util/parse-events.c |   18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6/tools/perf/util/parse-events.c
> ===================================================================
> --- linux-2.6.orig/tools/perf/util/parse-events.c
> +++ linux-2.6/tools/perf/util/parse-events.c
> @@ -121,13 +121,29 @@ static unsigned long hw_cache_stat[C(MAX
>  	   (strcmp(sys_dirent.d_name, ".")) &&				       \
>  	   (strcmp(sys_dirent.d_name, "..")))
>  
> +static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
> +{
> +	char evt_path[MAXPATHLEN];
> +	int fd;
> +
> +	snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
> +			sys_dir->d_name, evt_dir->d_name);
> +	fd = open(evt_path, O_RDONLY);
> +	if (fd < 0)
> +		return -EINVAL;
> +	close(fd);
> +
> +	return 0;
> +}
> +
>  #define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next, file, st)    \
>  	while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
>  	if (snprintf(file, MAXPATHLEN, "%s/%s/%s", debugfs_path,	       \
>  		     sys_dirent.d_name, evt_dirent.d_name) &&		       \
>  	   (!stat(file, &st)) && (S_ISDIR(st.st_mode)) &&		       \
>  	   (strcmp(evt_dirent.d_name, ".")) &&				       \
> -	   (strcmp(evt_dirent.d_name, "..")))
> +	   (strcmp(evt_dirent.d_name, "..")) &&				       \
> +	   (!tp_event_has_id(&sys_dirent, &evt_dirent)))
>  
>  #define MAX_EVENT_LENGTH 30
>  

looks good to me.

Acked-by: Jason Baron <jbaron@...hat.com>

thanks,

-Jason
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