linux-kernel - [PATCH v2 3/3] perf list: Support filtering in JSON output

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Message-ID: <20251120004726.61660-3-namhyung@kernel.org>
Date: Wed, 19 Nov 2025 16:47:26 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	James Clark <james.clark@...aro.org>
Cc: Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org
Subject: [PATCH v2 3/3] perf list: Support filtering in JSON output

Like regular output mode, it should honor command line arguments to
limit to a certain type of PMUs or events.

  $ perf list -j hw
  [
  {
          "Unit": "cpu",
          "Topic": "legacy hardware",
          "EventName": "branch-instructions",
          "EventType": "Kernel PMU event",
          "BriefDescription": "Retired branch instructions [This event is an alias of branches]",
          "Encoding": "cpu/event=0xc4\n/"
  },
  {
          "Unit": "cpu",
          "Topic": "legacy hardware",
          "EventName": "branch-misses",
          "EventType": "Kernel PMU event",
          "BriefDescription": "Mispredicted branch instructions",
          "Encoding": "cpu/event=0xc5\n/"
  },
  ...

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-list.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 6c5913f129f39c94..5cbca0bacd35237e 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -373,6 +373,23 @@ static void json_print_event(void *ps, const char *topic,
 	FILE *fp = print_state->common.fp;
 	struct strbuf buf;
 
+	if (deprecated && !print_state->common.deprecated)
+		return;
+
+	if (print_state->common.pmu_glob &&
+	    (!pmu_name || !strglobmatch(pmu_name, print_state->common.pmu_glob)))
+		return;
+
+	if (print_state->common.exclude_abi && pmu_type < PERF_TYPE_MAX &&
+	    pmu_type != PERF_TYPE_RAW)
+		return;
+
+	if (print_state->common.event_glob &&
+	    (!event_name || !strglobmatch(event_name, print_state->common.event_glob)) &&
+	    (!event_alias || !strglobmatch(event_alias, print_state->common.event_glob)) &&
+	    (!topic || !strglobmatch_nocase(topic, print_state->common.event_glob)))
+		return;
+
 	strbuf_init(&buf, 0);
 	fprintf(fp, "%s{\n", print_state->need_sep ? ",\n" : "");
 	print_state->need_sep = true;
@@ -449,6 +466,13 @@ static void json_print_metric(void *ps __maybe_unused, const char *group,
 	FILE *fp = print_state->common.fp;
 	struct strbuf buf;
 
+	if (print_state->common.event_glob &&
+	    (!print_state->common.metrics || !name ||
+	     !strglobmatch(name, print_state->common.event_glob)) &&
+	    (!print_state->common.metricgroups || !group ||
+	     !strglobmatch(group, print_state->common.event_glob)))
+		return;
+
 	strbuf_init(&buf, 0);
 	fprintf(fp, "%s{\n", print_state->need_sep ? ",\n" : "");
 	print_state->need_sep = true;
-- 
2.52.0.rc1.455.g30608eb744-goog