linux-kernel - Re: [PATCH v4 3/6] perf stat: Avoid printing cpus with no counters

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Message-ID: <8510a140-e2e2-39ce-b344-b456f069a9d0@intel.com>
Date:   Mon, 2 May 2022 19:09:08 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        James Clark <james.clark@....com>,
        German Gomez <german.gomez@....com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v4 3/6] perf stat: Avoid printing cpus with no counters

On 30/04/22 09:23, Ian Rogers wrote:
> perf_evlist's user_requested_cpus can contain CPUs not present in any
> evsel's cpus, for example uncore counters. Avoid printing the prefix and
> trailing \n until the first valid counter is encountered.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  tools/perf/util/stat-display.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index d9629a83aa78..13f705737367 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -948,8 +948,6 @@ static void print_no_aggr_metric(struct perf_stat_config *config,
>  		struct evsel *counter;
>  		bool first = true;
>  
> -		if (prefix)
> -			fputs(prefix, config->output);
>  		evlist__for_each_entry(evlist, counter) {
>  			u64 ena, run, val;
>  			double uval;
> @@ -961,6 +959,8 @@ static void print_no_aggr_metric(struct perf_stat_config *config,
>  
>  			id = aggr_cpu_id__cpu(cpu, /*data=*/NULL);
>  			if (first) {
> +				if (prefix)
> +					fputs(prefix, config->output);
>  				aggr_printout(config, counter, id, 0);
>  				first = false;
>  			}
> @@ -972,7 +972,8 @@ static void print_no_aggr_metric(struct perf_stat_config *config,
>  			printout(config, id, 0, counter, uval, prefix,
>  				 run, ena, 1.0, &rt_stat);
>  		}
> -		fputc('\n', config->output);
> +		if (!first)
> +			fputc('\n', config->output);
>  	}
>  }
>