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 6c5913f129f39c9491a318aaf77e49604a69f653..5cbca0bacd35237e5a1252bf21f3809da8c92e9b 100644 (file)
--- 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;