linux-kernel - RE: [PATCH] perf stat: Fix multi-line metric output in JSON

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Date:   Fri, 2 Dec 2022 19:31:59 +0000
From:   "Wang, Weilin" <weilin.wang@...el.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
CC:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        "Hunter, Adrian" <adrian.hunter@...el.com>,
        "linux-perf-users@...r.kernel.org" <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] perf stat: Fix multi-line metric output in JSON

Namhyung, it works. Thanks!

-----Original Message-----
From: Namhyung Kim <namhyung@...il.com> On Behalf Of Namhyung Kim
Sent: Friday, December 2, 2022 11:05 AM
To: Arnaldo Carvalho de Melo <acme@...nel.org>; Jiri Olsa <jolsa@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>; Peter Zijlstra <peterz@...radead.org>; LKML <linux-kernel@...r.kernel.org>; Ian Rogers <irogers@...gle.com>; Hunter, Adrian <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>; Wang, Weilin <weilin.wang@...el.com>
Subject: [PATCH] perf stat: Fix multi-line metric output in JSON

When a metric produces more than one values, it missed to print the opening bracket.

Fixes: ab6baaae2735 ("perf stat: Fix JSON output in metric-only mode")
Reported-by: "Wang, Weilin" <weilin.wang@...el.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
Weilin, could you please verify it fixes your problem?

 tools/perf/util/stat-display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c index f1ee4b052198..8d0bdd57163d 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -440,7 +440,7 @@ static void new_line_json(struct perf_stat_config *config, void *ctx)  {
 	struct outstate *os = ctx;
 
-	fputc('\n', os->fh);
+	fputs("\n{", os->fh);
 	if (os->prefix)
 		fprintf(os->fh, "%s", os->prefix);
 	aggr_printout(config, os->evsel, os->id, os->nr);
--
2.39.0.rc0.267.gcb52ba06e7-goog