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perf stat: Add header for interval in JSON output

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It missed to print a matching header line for intervals.

Before:

  # perf stat -a -e cycles,instructions --metric-only -j -I 500
  {"unit" : "insn per cycle"}
  {"interval" : 0.500544283}{"metric-value" : "1.96"}
  ^C

After:

  # perf stat -a -e cycles,instructions --metric-only -j -I 500
  {"unit" : "sec"}{"unit" : "insn per cycle"}
  {"interval" : 0.500515681}{"metric-value" : "2.31"}
  ^C

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20221107213314.3239159-8-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
2022-11-07 13:33:12 -08:00
committed by Arnaldo Carvalho de Melo
parent 6d0a7e394e
commit 1cc7642abb
1 changed files with 4 additions and 0 deletions
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4
tools/perf/util/stat-display.c
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@@ -858,6 +858,10 @@ static void print_metric_headers(struct perf_stat_config *config,
if (!config->iostat_run)
fputs(aggr_header_csv[config->aggr_mode], config->output);
}
if (config->json_output) {
if (config->interval)
fputs("{\"unit\" : \"sec\"}", config->output);
}
if (config->iostat_run)
iostat_print_header_prefix(config);