From: Namhyung Kim <namhyung@kernel.org>
Date: Thu, 20 Nov 2025 00:47:26 +0000 (-0800)
Subject: perf list: Support filtering in JSON output
X-Git-Tag: v6.19-rc1~61^2~71
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3ce77655f026a316442f23d47da6c5cd89c1fdac;p=thirdparty%2Fkernel%2Flinux.git

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/"
  },
  ...

Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 6c5913f129f39..5cbca0bacd352 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;