[PATCH v2 41/43] perf metrics: Be PMU specific in event match

Ian Rogers
2023-04-28T07:47:06Z

Ids/events from a metric are turned into an event string and parsed;
setup_metric_events matches the id back to the parsed evsel. With
hybrid the same event may exist on both PMUs with the same name and be
being used by metrics at the same time. A metric on cpu_core therefore
shouldn't match against evsels on cpu_atom, or the metric will compute
the wrong value. Make the matching sensitive to the PMU being parsed.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/metricgroup.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 4245b23d8efe..490561f430f2 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -274,7 +274,7 @@ static int setup_metric_events(const char *pmu, struct hashmap *ids,
const char *metric_id;
struct evsel *ev;
size_t ids_size, matched_events, i;
- bool all_pmus = !strcmp(pmu, "all");
+ bool all_pmus = !strcmp(pmu, "all") || !perf_pmu__is_hybrid(pmu);

*out_metric_events = NULL;
ids_size = hashmap__size(ids);
@@ -287,7 +287,10 @@ static int setup_metric_events(const char *pmu, struct hashmap *ids,
evlist__for_each_entry(metric_evlist, ev) {
struct expr_id_data *val_ptr;

- if (!all_pmus && strcmp(ev->pmu_name, pmu))
+ /* Don't match events for the wrong hybrid PMU. */
+ if (!all_pmus && ev->pmu_name &&
+ perf_pmu__is_hybrid(ev->pmu_name) &&
+ strcmp(ev->pmu_name, pmu))
continue;
/*
* Check for duplicate events with the same name. For
@@ -304,6 +307,7 @@ static int setup_metric_events(const char *pmu, struct hashmap *ids,
* about this event.
*/
if (hashmap__find(ids, metric_id, &val_ptr)) {
+ pr_debug("Matched metric-id %s to %s\n", metric_id, evsel__name(ev));
metric_events[matched_events++] = ev;

if (matched_events >= ids_size)
@@ -1592,7 +1596,7 @@ static int parse_groups(struct evlist *perf_evlist,
ret = setup_metric_events(fake_pmu ? "all" : m->pmu, m->pctx->ids,
metric_evlist, &metric_events);
if (ret) {
- pr_debug("Cannot resolve IDs for %s: %s\n",
+ pr_err("Cannot resolve IDs for %s: %s\n",
m->metric_name, m->metric_expr);
goto out;
}
--
2.40.1.495.gc816e09b53d-goog