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Date: Wed, 23 Nov 2022 15:23:13 -0800
From: Ian Rogers <irogers@...gle.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
linux-perf-users@...r.kernel.org,
Kan Liang <kan.liang@...ux.intel.com>,
Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
James Clark <james.clark@....com>,
Athira Jajeev <atrajeev@...ux.vnet.ibm.com>
Subject: Re: [PATCH 05/15] perf stat: Remove prefix argument in print_metric_headers()
On Wed, Nov 23, 2022 at 10:02 AM Namhyung Kim <namhyung@...nel.org> wrote:
>
> It always passes a whitespace to the function, thus we can just add it to the
> function body. Furthermore, it's only used in the normal output mode.
>
> Well, actually CSV used it but it doesn't need to since we don't care about the
> indentation or alignment in the CSV output.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Acked-by: Ian Rogers <irogers@...gle.com>
Thanks,
Ian
> ---
> tools/perf/util/stat-display.c | 26 ++++++++++----------------
> 1 file changed, 10 insertions(+), 16 deletions(-)
>
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index 744b7a40f59a..deed6ccf072f 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -996,10 +996,9 @@ static void print_no_aggr_metric(struct perf_stat_config *config,
> }
>
> static void print_metric_headers_std(struct perf_stat_config *config,
> - const char *prefix, bool no_indent)
> + bool no_indent)
> {
> - if (prefix)
> - fprintf(config->output, "%s", prefix);
> + fputc(' ', config->output);
>
> if (!no_indent) {
> int len = aggr_header_lens[config->aggr_mode];
> @@ -1012,11 +1011,8 @@ static void print_metric_headers_std(struct perf_stat_config *config,
> }
>
> static void print_metric_headers_csv(struct perf_stat_config *config,
> - const char *prefix,
> bool no_indent __maybe_unused)
> {
> - if (prefix)
> - fprintf(config->output, "%s", prefix);
> if (config->interval)
> fputs("time,", config->output);
> if (!config->iostat_run)
> @@ -1024,7 +1020,6 @@ static void print_metric_headers_csv(struct perf_stat_config *config,
> }
>
> static void print_metric_headers_json(struct perf_stat_config *config,
> - const char *prefix __maybe_unused,
> bool no_indent __maybe_unused)
> {
> if (config->interval)
> @@ -1032,8 +1027,7 @@ static void print_metric_headers_json(struct perf_stat_config *config,
> }
>
> static void print_metric_headers(struct perf_stat_config *config,
> - struct evlist *evlist,
> - const char *prefix, bool no_indent)
> + struct evlist *evlist, bool no_indent)
> {
> struct evsel *counter;
> struct outstate os = {
> @@ -1047,11 +1041,11 @@ static void print_metric_headers(struct perf_stat_config *config,
> };
>
> if (config->json_output)
> - print_metric_headers_json(config, prefix, no_indent);
> + print_metric_headers_json(config, no_indent);
> else if (config->csv_output)
> - print_metric_headers_csv(config, prefix, no_indent);
> + print_metric_headers_csv(config, no_indent);
> else
> - print_metric_headers_std(config, prefix, no_indent);
> + print_metric_headers_std(config, no_indent);
>
> if (config->iostat_run)
> iostat_print_header_prefix(config);
> @@ -1132,7 +1126,7 @@ static void print_header_interval_std(struct perf_stat_config *config,
> }
>
> if (config->metric_only)
> - print_metric_headers(config, evlist, " ", true);
> + print_metric_headers(config, evlist, true);
> else
> fprintf(output, " %*s %*s events\n",
> COUNTS_LEN, "counts", config->unit_width, "unit");
> @@ -1168,7 +1162,7 @@ static void print_header_std(struct perf_stat_config *config,
> fprintf(output, ":\n\n");
>
> if (config->metric_only)
> - print_metric_headers(config, evlist, " ", false);
> + print_metric_headers(config, evlist, false);
> }
>
> static void print_header_csv(struct perf_stat_config *config,
> @@ -1178,7 +1172,7 @@ static void print_header_csv(struct perf_stat_config *config,
> const char **argv __maybe_unused)
> {
> if (config->metric_only)
> - print_metric_headers(config, evlist, " ", true);
> + print_metric_headers(config, evlist, true);
> }
> static void print_header_json(struct perf_stat_config *config,
> struct target *_target __maybe_unused,
> @@ -1187,7 +1181,7 @@ static void print_header_json(struct perf_stat_config *config,
> const char **argv __maybe_unused)
> {
> if (config->metric_only)
> - print_metric_headers(config, evlist, " ", true);
> + print_metric_headers(config, evlist, true);
> }
>
> static void print_header(struct perf_stat_config *config,
> --
> 2.38.1.584.g0f3c55d4c2-goog
>
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