linux-kernel - Re: [PATCH 5/5] perf stat: Fix duplicate PMU name for interval print

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Date:   Tue, 24 Apr 2018 15:53:34 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     kan.liang@...ux.intel.com
Cc:     mingo@...hat.com, peterz@...radead.org,
        linux-kernel@...r.kernel.org, jolsa@...hat.com,
        namhyung@...nel.org, ganapatrao.kulkarni@...ium.com,
        zhangshaokun@...ilicon.com, yao.jin@...ux.intel.com,
        will.deacon@....com, ak@...ux.intel.com, agustinv@...eaurora.org
Subject: Re: [PATCH 5/5] perf stat: Fix duplicate PMU name for interval print

Em Tue, Apr 24, 2018 at 11:20:14AM -0700, kan.liang@...ux.intel.com escreveu:
> From: Kan Liang <kan.liang@...ux.intel.com>
> 
> PMU name is printed repeatedly for interval print, for example:
> 
>   perf stat --no-merge -e 'unc_m_clockticks' -a -I 1000
>   #           time             counts unit events
>      1.001053069        243,702,144      unc_m_clockticks [uncore_imc_4]
>      1.001053069        244,268,304      unc_m_clockticks [uncore_imc_2]
>      1.001053069        244,427,386      unc_m_clockticks [uncore_imc_0]
>      1.001053069        244,583,760      unc_m_clockticks [uncore_imc_5]
>      1.001053069        244,738,971      unc_m_clockticks [uncore_imc_3]
>      1.001053069        244,880,309      unc_m_clockticks [uncore_imc_1]
>      2.002024821        240,818,200      unc_m_clockticks [uncore_imc_4] [uncore_imc_4]
>      2.002024821        240,767,812      unc_m_clockticks [uncore_imc_2] [uncore_imc_2]
>      2.002024821        240,764,215      unc_m_clockticks [uncore_imc_0] [uncore_imc_0]
>      2.002024821        240,759,504      unc_m_clockticks [uncore_imc_5] [uncore_imc_5]
>      2.002024821        240,755,992      unc_m_clockticks [uncore_imc_3] [uncore_imc_3]
>      2.002024821        240,750,403      unc_m_clockticks [uncore_imc_1] [uncore_imc_1]
> 
> For each print, the PMU name is unconditionally appended to the
> counter->name.
> Need to check the counter->name first. If the PMU name is already
> appended, do nothing.
> 
> Fixes: 8c5421c016a4 ("perf pmu: Display pmu name when printing unmerged events in stat")
> +++ b/tools/perf/builtin-stat.c
> @@ -1296,6 +1296,8 @@ static void uniquify_event_name(struct perf_evsel *counter)
>  			counter->name = new_name;
>  		}
>  	} else {
> +		if (strstr(counter->name, counter->pmu_name))
> +			return;
>  		if (asprintf(&new_name,
>  			     "%s [%s]", counter->name, counter->pmu_name) > 0) {
>  			free(counter->name);

Humm, do you have any problem with the patch below instead?

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 2137c7d11767..8518342c5466 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1261,7 +1261,8 @@ static void uniquify_event_name(struct perf_evsel *counter)
 	char *new_name;
 	char *config;
 
-	if (!counter->pmu_name || !strncmp(counter->name, counter->pmu_name,
+	if (counter->uniquified_name ||
+	    !counter->pmu_name || !strncmp(counter->name, counter->pmu_name,
 					   strlen(counter->pmu_name)))
 		return;
 
@@ -1279,6 +1280,8 @@ static void uniquify_event_name(struct perf_evsel *counter)
 			counter->name = new_name;
 		}
 	}
+
+	counter->uniquified_name = true;
 }
 
 static void collect_all_aliases(struct perf_evsel *counter,
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index d3ee3af618ef..92ec009a292d 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -115,6 +115,7 @@ struct perf_evsel {
 	unsigned int		sample_size;
 	int			id_pos;
 	int			is_pos;
+	bool			uniquified_name;
 	bool			snapshot;
 	bool 			supported;
 	bool 			needs_swap;