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

[Arnaldo Carvalho de Melo]

Em Tue, Apr 24, 2018 at 11:20:14AM -0700, kan.li...@linux.intel.com escreveu:
> From: Kan Liang <kan.li...@linux.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;