From 1cc7642abba7b281ecd836bfb56fc6dedac32555 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Mon, 7 Nov 2022 13:33:12 -0800 Subject: [PATCH] perf stat: Add header for interval in JSON output 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 Acked-by: Ian Rogers Cc: Adrian Hunter Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Peter Zijlstra Cc: Xing Zhengjun Link: https://lore.kernel.org/r/20221107213314.3239159-8-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/stat-display.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c index 99bc0db..2a08c66 100644 --- a/tools/perf/util/stat-display.c +++ b/tools/perf/util/stat-display.c @@ -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); -- 2.7.4