Date: Thu, 16 May 2024 09:47:01 -0700
From: Ian Rogers <irogers@...gle.com>
To: weilin.wang@...el.com
Cc: Namhyung Kim <namhyung@...nel.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Perry Taylor <perry.taylor@...el.com>, Samantha Alt <samantha.alt@...el.com>, 
	Caleb Biggers <caleb.biggers@...el.com>
Subject: Re: [RFC PATCH v8 5/7] perf stat: Add retire latency print functions
 to print out at the very end of print out

On Tue, May 14, 2024 at 10:44 PM <weilin.wang@...el.com> wrote:
>
> From: Weilin Wang <weilin.wang@...el.com>
>
> Add print out functions so that users could read retire latency values.
>
> Example output:
>
>  Performance counter stats for 'system wide':
>
>             25,717      MEM_INST_RETIRED.SPLIT_STORES    #      2.2 %  tma_split_stores
>         28,365,080      CPU_CLK_UNHALTED.THREAD
>              24.00      MEM_INST_RETIRED.SPLIT_STORES:R  #       96        4
>
>        2.054365083 seconds time elapsed
>
> This output of retire latency data is in format:
>  <val> <event-name:R> # <sum> <count>.
>
> Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> Reviewed-by: Ian Rogers <irogers@...gle.com>

My usual complaint that I hate the stat-display spaghetti code. We
keep putting more spaghetti on the plate and this change does this
too. In the evsel approach:
https://lore.kernel.org/lkml/20240428053616.1125891-1-irogers@google.com/
retirement latency events just update the counts for the event and so
we don't need to special case tpebs events like this. I'd prefer we
went that route. My reviewed-by no longer stands.

Thanks,
Ian

> ---
>  tools/perf/util/stat-display.c | 69 ++++++++++++++++++++++++++++++++++
>  1 file changed, 69 insertions(+)
>
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index bfc1d705f437..b9c3978cc99c 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -21,6 +21,7 @@
>  #include "iostat.h"
>  #include "pmu.h"
>  #include "pmus.h"
> +#include "intel-tpebs.h"
>
>  #define CNTR_NOT_SUPPORTED     "<not supported>"
>  #define CNTR_NOT_COUNTED       "<not counted>"
> @@ -34,6 +35,7 @@
>  #define COMM_LEN     16
>  #define PID_LEN       7
>  #define CPUS_LEN      4
> +#define RETIRE_LEN    8
>
>  static int aggr_header_lens[] = {
>         [AGGR_CORE]     = 18,
> @@ -426,6 +428,71 @@ static void print_metric_std(struct perf_stat_config *config,
>         fprintf(out, " %-*s", METRIC_LEN - n - 1, unit);
>  }
>
> +static void print_retire_lat_std(struct perf_stat_config *config,
> +                                struct outstate *os)
> +{
> +       FILE *out = os->fh;
> +       bool newline = os->newline;
> +       struct tpebs_retire_lat *t;
> +       struct list_head *retire_lats = &config->tpebs_results;
> +
> +       list_for_each_entry(t, retire_lats, nd) {
> +               if (newline)
> +                       do_new_line_std(config, os);
> +               fprintf(out, "%'*.2f ", COUNTS_LEN, t->val);
> +               /* For print alignment */
> +               fprintf(out, "%-*s ", config->unit_width, "");
> +               fprintf(out, "%-*s", EVNAME_LEN, t->tpebs_name);
> +               fprintf(out, " # ");
> +               fprintf(out, "%*d %*ld\n", RETIRE_LEN, t->sum,
> +                        RETIRE_LEN, t->count);
> +       }
> +}
> +
> +static void print_retire_lat_csv(struct perf_stat_config *config,
> +                                struct outstate *os)
> +{
> +       FILE *out = os->fh;
> +       struct tpebs_retire_lat *t;
> +       struct list_head *retire_lats = &config->tpebs_results;
> +       const char *sep = config->csv_sep;
> +
> +       list_for_each_entry(t, retire_lats, nd) {
> +               fprintf(out, "%f%s%s%s%s%ld%s%d\n", t->val, sep, sep, t->tpebs_name, sep,
> +                       t->count, sep, t->sum);
> +       }
> +}
> +
> +static void print_retire_lat_json(struct perf_stat_config *config,
> +                                 struct outstate *os)
> +{
> +       FILE *out = os->fh;
> +       struct tpebs_retire_lat *t;
> +       struct list_head *retire_lats = &config->tpebs_results;
> +
> +       fprintf(out, "{");
> +       list_for_each_entry(t, retire_lats, nd) {
> +               fprintf(out, "\"retire_latency-value\" : \"%f\", ", t->val);
> +               fprintf(out, "\"name\" : \"%s\"", t->tpebs_name);
> +               fprintf(out, "\"sample-counts\" : \"%ld\"", t->count);
> +               fprintf(out, "\"retire_latency-sum\" : \"%d\"", t->sum);
> +       }
> +       fprintf(out, "}");
> +}
> +
> +static void print_retire_lat(struct perf_stat_config *config,
> +                            struct outstate *os)
> +{
> +       if (!&config->tpebs_results)
> +               return;
> +       if (config->json_output)
> +               print_retire_lat_json(config, os);
> +       else if (config->csv_output)
> +               print_retire_lat_csv(config, os);
> +       else
> +               print_retire_lat_std(config, os);
> +}
> +
>  static void new_line_csv(struct perf_stat_config *config, void *ctx)
>  {
>         struct outstate *os = ctx;
> @@ -1609,6 +1676,8 @@ void evlist__print_counters(struct evlist *evlist, struct perf_stat_config *conf
>                 break;
>         }
>
> +       print_retire_lat(config, &os);
> +
>         print_footer(config);
>
>         fflush(config->output);
> --
> 2.43.0
>

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