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perf list: Support filtering in JSON output

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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>
This commit is contained in:
Namhyung Kim
2025-11-19 16:47:26 -08:00
parent 58e0a81e76
commit 3ce77655f0
1 changed files with 24 additions and 0 deletions
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24
tools/perf/builtin-list.c
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@@ -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;