linux-kernel - Re: [PATCH] perf stat: Use aggregated counts directly

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Date:   Sun, 25 Apr 2021 17:50:07 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Jin Yao <yao.jin@...ux.intel.com>
Subject: Re: [PATCH] perf stat: Use aggregated counts directly

On Thu, Apr 22, 2021 at 07:38:33PM -0700, Namhyung Kim wrote:
> The ps->res_stats is for repeated runs, so the interval code should
> not touch it.  Actually the aggregated counts are available in the
> counter->counts->aggr, so we can (and should) use it directly IMHO.
> 
> No functional change intended.

it looks ok, but it should fix the noise output then, right?

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/stat-display.c |  8 ++++----
>  tools/perf/util/stat.c         | 12 ------------
>  2 files changed, 4 insertions(+), 16 deletions(-)
> 
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index d3137bc17065..a38fa6527586 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -807,11 +807,11 @@ static void counter_aggr_cb(struct perf_stat_config *config __maybe_unused,
>  			    bool first __maybe_unused)
>  {
>  	struct caggr_data *cd = data;
> -	struct perf_stat_evsel *ps = counter->stats;
> +	struct perf_counts_values *aggr = &counter->counts->aggr;
>  
> -	cd->avg += avg_stats(&ps->res_stats[0]);
> -	cd->avg_enabled += avg_stats(&ps->res_stats[1]);
> -	cd->avg_running += avg_stats(&ps->res_stats[2]);
> +	cd->avg += aggr->val;
> +	cd->avg_enabled += aggr->ena;
> +	cd->avg_running += aggr->run;
>  }
>  
>  /*
> diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> index 2db46b9bebd0..d3ec2624e036 100644
> --- a/tools/perf/util/stat.c
> +++ b/tools/perf/util/stat.c
> @@ -437,18 +437,6 @@ int perf_stat_process_counter(struct perf_stat_config *config,
>  
>  	aggr->val = aggr->ena = aggr->run = 0;
>  
> -	/*
> -	 * We calculate counter's data every interval,
> -	 * and the display code shows ps->res_stats
> -	 * avg value. We need to zero the stats for
> -	 * interval mode, otherwise overall avg running
> -	 * averages will be shown for each interval.
> -	 */
> -	if (config->interval || config->summary) {
> -		for (i = 0; i < 3; i++)
> -			init_stats(&ps->res_stats[i]);
> -	}
> -
>  	if (counter->per_pkg)
>  		evsel__zero_per_pkg(counter);
>  
> -- 
> 2.31.1.498.g6c1eba8ee3d-goog
>