linux-kernel - Re: [PATCH 02/14] perf util: Use evsel->name to get tracepoint

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Date:	Tue, 23 Apr 2013 09:07:20 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 02/14] perf util: Use evsel->name to get tracepoint_paths

On Tue, 2013-04-23 at 17:31 +0900, Namhyung Kim wrote:
> From: Namhyung Kim <namhyung.kim@....com>
> 
> Most tracepoint events already have their system and event name in
> ->name field so that searching whole event tracing directory for each
> evsel to match given id is suboptimal.
> 
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/trace-event-info.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
> index ab18bf12d54a..dcfc1869c9af 100644
> --- a/tools/perf/util/trace-event-info.c
> +++ b/tools/perf/util/trace-event-info.c
> @@ -414,12 +414,31 @@ get_tracepoints_path(struct list_head *pattrs)
>  		if (pos->attr.type != PERF_TYPE_TRACEPOINT)
>  			continue;
>  		++nr_tracepoints;
> +
> +		if (pos->name && strchr(pos->name, ':')) {
> +			char *str = strchr(pos->name, ':');

Why not make the above into:

	if (pos->name && (str = strchr(pos->name, ':'))) {

?

-- Steve



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