linux-kernel - Re: [PATCH 3/5] perf evsel: Add tool event helpers

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Date:   Mon, 9 May 2022 10:16:35 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Riccardo Mancini <rickyman7@...il.com>,
        Kim Phillips <kim.phillips@....com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Shunsuke Nakamura <nakamura.shun@...itsu.com>,
        Florian Fischer <florian.fischer@...q.space>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        James Clark <james.clark@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 3/5] perf evsel: Add tool event helpers

Em Fri, May 06, 2022 at 10:34:08PM -0700, Ian Rogers escreveu:
> Convert to and from a string. Fix evsel__tool_name as array is off-by-1.
> Support more than just duration_time as a metric-id.

Good catch, I added this:

Fixes: 75eafc970bd9d36d ("perf list: Print all available tool events")

- Arnaldo
 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/evsel.c | 41 +++++++++++++++++++++++++++++++----------
>  tools/perf/util/evsel.h | 11 +++++++++++
>  2 files changed, 42 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index cdeace24d9be..5fd7924f8eb3 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -59,6 +59,33 @@ struct perf_missing_features perf_missing_features;
>  
>  static clockid_t clockid;
>  
> +static const char *const perf_tool_event__tool_names[PERF_TOOL_MAX] = {
> +	NULL,
> +	"duration_time",
> +	"user_time",
> +	"system_time",
> +};
> +
> +const char *perf_tool_event__to_str(enum perf_tool_event ev)
> +{
> +	if (ev > PERF_TOOL_NONE && ev < PERF_TOOL_MAX)
> +		return perf_tool_event__tool_names[ev];
> +
> +	return NULL;
> +}
> +
> +enum perf_tool_event perf_tool_event__from_str(const char *str)
> +{
> +	int i;
> +
> +	perf_tool_event__for_each_event(i) {
> +		if (!strcmp(str, perf_tool_event__tool_names[i]))
> +			return i;
> +	}
> +	return PERF_TOOL_NONE;
> +}
> +
> +
>  static int evsel__no_extra_init(struct evsel *evsel __maybe_unused)
>  {
>  	return 0;
> @@ -597,15 +624,9 @@ static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
>  	return r + evsel__add_modifiers(evsel, bf + r, size - r);
>  }
>  
> -static const char *const evsel__tool_names[PERF_TOOL_MAX] = {
> -	"duration_time",
> -	"user_time",
> -	"system_time",
> -};
> -
>  static int evsel__tool_name(enum perf_tool_event ev, char *bf, size_t size)
>  {
> -	return scnprintf(bf, size, "%s", evsel__tool_names[ev]);
> +	return scnprintf(bf, size, "%s", perf_tool_event__to_str(ev));
>  }
>  
>  static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
> @@ -758,7 +779,7 @@ const char *evsel__name(struct evsel *evsel)
>  		break;
>  
>  	case PERF_TYPE_SOFTWARE:
> -		if (evsel->tool_event)
> +		if (evsel__is_tool(evsel))
>  			evsel__tool_name(evsel->tool_event, bf, sizeof(bf));
>  		else
>  			evsel__sw_name(evsel, bf, sizeof(bf));
> @@ -791,8 +812,8 @@ const char *evsel__metric_id(const struct evsel *evsel)
>  	if (evsel->metric_id)
>  		return evsel->metric_id;
>  
> -	if (evsel->core.attr.type == PERF_TYPE_SOFTWARE && evsel->tool_event)
> -		return "duration_time";
> +	if (evsel__is_tool(evsel))
> +		return perf_tool_event__to_str(evsel->tool_event);
>  
>  	return "unknown";
>  }
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index a017781cdd47..d4b04537ce6d 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -36,6 +36,12 @@ enum perf_tool_event {
>  	PERF_TOOL_MAX,
>  };
>  
> +const char *perf_tool_event__to_str(enum perf_tool_event ev);
> +enum perf_tool_event perf_tool_event__from_str(const char *str);
> +
> +#define perf_tool_event__for_each_event(ev)		\
> +	for ((ev) = PERF_TOOL_DURATION_TIME; (ev) < PERF_TOOL_MAX; ev++)
> +
>  /** struct evsel - event selector
>   *
>   * @evlist - evlist this evsel is in, if it is in one.
> @@ -269,6 +275,11 @@ int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size
>  const char *evsel__name(struct evsel *evsel);
>  const char *evsel__metric_id(const struct evsel *evsel);
>  
> +static inline bool evsel__is_tool(const struct evsel *evsel)
> +{
> +	return evsel->tool_event != PERF_TOOL_NONE;
> +}
> +
>  const char *evsel__group_name(struct evsel *evsel);
>  int evsel__group_desc(struct evsel *evsel, char *buf, size_t size);
>  
> -- 
> 2.36.0.512.ge40c2bad7a-goog

-- 

- Arnaldo