perf pmu-events: Reduce processed events by passing PMU

Pass the PMU to pmu_events_table__for_each_event so that entries that
don't match don't need to be processed by callback.

If a NULL PMU is passed then all PMUs are processed.

'perf bench internals pmu-scan's "Average PMU scanning" performance is
reduced by about 5% on an Intel tigerlake.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Gaosheng Cui <cuigaosheng1@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230824041330.266337-8-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 11 insertions, 25 deletions

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 0c82bbeea7d6..9ba9ac3d3d96 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -859,28 +859,14 @@ out:
 	return res;
 }
 
-struct pmu_add_cpu_aliases_map_data {
-	/* List being added to. */
-	struct list_head *head;
-	/* If a pmu_event lacks a given PMU the default used. */
-	char *default_pmu_name;
-	/* The PMU that we're searching for events for. */
-	struct perf_pmu *pmu;
-};
-
 static int pmu_add_cpu_aliases_map_callback(const struct pmu_event *pe,
 					const struct pmu_events_table *table __maybe_unused,
 					void *vdata)
 {
-	struct pmu_add_cpu_aliases_map_data *data = vdata;
-	const char *pname = pe->pmu ?: data->default_pmu_name;
+	struct list_head *head = vdata;
 
-	if (!strcmp(pname, data->pmu->name) ||
-	    (data->pmu->is_uncore && pmu_uncore_alias_match(pname, data->pmu->name))) {
-		/* need type casts to override 'const' */
-		__perf_pmu__new_alias(data->head, -1, (char *)pe->name, (char *)pe->desc,
-				      (char *)pe->event, pe);
-	}
+	/* need type casts to override 'const' */
+	__perf_pmu__new_alias(head, -1, (char *)pe->name, (char *)pe->desc, (char *)pe->event, pe);
 	return 0;
 }
 
@@ -890,14 +876,7 @@ static int pmu_add_cpu_aliases_map_callback(const struct pmu_event *pe,
  */
 void pmu_add_cpu_aliases_table(struct perf_pmu *pmu, const struct pmu_events_table *table)
 {
-	struct pmu_add_cpu_aliases_map_data data = {
-		.head = &pmu->aliases,
-		.default_pmu_name = perf_pmus__default_pmu_name(),
-		.pmu = pmu,
-	};
-
-	pmu_events_table__for_each_event(table, pmu_add_cpu_aliases_map_callback, &data);
-	free(data.default_pmu_name);
+	pmu_events_table__for_each_event(table, pmu, pmu_add_cpu_aliases_map_callback, &pmu->aliases);
 }
 
 static void pmu_add_cpu_aliases(struct perf_pmu *pmu)
@@ -1713,6 +1692,12 @@ int perf_pmu__for_each_event(const struct perf_pmu *pmu, void *state, pmu_event_
 	return ret;
 }
 
+bool pmu__name_match(const struct perf_pmu *pmu, const char *pmu_name)
+{
+	return !strcmp(pmu->name, pmu_name) ||
+		(pmu->is_uncore && pmu_uncore_alias_match(pmu_name, pmu->name));
+}
+
 bool perf_pmu__is_software(const struct perf_pmu *pmu)
 {
 	if (pmu->is_core || pmu->is_uncore || pmu->auxtrace)
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 03211de345c1..2b1730152bc0 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -198,6 +198,7 @@ bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu);
 bool perf_pmu__have_event(const struct perf_pmu *pmu, const char *name);
 size_t perf_pmu__num_events(const struct perf_pmu *pmu);
 int perf_pmu__for_each_event(const struct perf_pmu *pmu, void *state, pmu_event_callback cb);
+bool pmu__name_match(const struct perf_pmu *pmu, const char *pmu_name);
 
 /**
  * perf_pmu_is_software - is the PMU a software PMU as in it uses the