Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Sender: Namhyung Kim <namhyung@gmail.com>
From:   Namhyung Kim <namhyung@kernel.org>
To:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Jiri Olsa <jolsa@kernel.org>
Cc:     Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Ian Rogers <irogers@google.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        linux-perf-users@vger.kernel.org,
        Kan Liang <kan.liang@linux.intel.com>,
        Zhengjun Xing <zhengjun.xing@linux.intel.com>,
        James Clark <james.clark@arm.com>
Subject: [PATCH 07/11] perf stat: Add header for interval in JSON output
Date:   Fri, 11 Nov 2022 19:22:40 -0800
Message-Id: <20221112032244.1077370-8-namhyung@kernel.org>
In-Reply-To: <20221112032244.1077370-1-namhyung@kernel.org>
References: <20221112032244.1077370-1-namhyung@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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

Acked-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 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 dbd3ba380c9f..03d58277e8d6 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -860,6 +860,10 @@ 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);
 
-- 
2.38.1.493.g58b659f92b-goog