linux-kernel - [PATCH v2 2/3] perf stat: Don't write "started on" for json output

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Date:   Fri,  7 Apr 2023 22:44:55 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] perf stat: Don't write "started on" for json output

Json files don't support comments. Disable the "started on" comment
when writing json output to file.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-stat.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 38133afda7fc..40770926a230 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -2272,8 +2272,10 @@ int cmd_stat(int argc, const char **argv)
 			perror("failed to create output file");
 			return -1;
 		}
-		clock_gettime(CLOCK_REALTIME, &tm);
-		fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
+		if (!stat_config.json_output) {
+			clock_gettime(CLOCK_REALTIME, &tm);
+			fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
+		}
 	} else if (output_fd > 0) {
 		mode = append_file ? "a" : "w";
 		output = fdopen(output_fd, mode);
-- 
2.40.0.577.gac1e443424-goog