[PATCH 09/19] perf metric: Collect referenced metrics in struct metric_expr

[Jiri Olsa]

Add referenced metrics into struct metric_expr object,
so they are accessible when computing the metric.

Storing just name and expression itself, so the metric
can be resolved and computed.

Acked-by: Ian Rogers <irog...@google.com>
Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 tools/perf/util/metricgroup.c | 32 ++++++++++++++++++++++++++++++++
 tools/perf/util/metricgroup.h |  6 ++++++
 2 files changed, 38 insertions(+)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index d1b2c1aa436f..bb5757b9419d 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -83,6 +83,7 @@ static void metric_event_delete(struct rblist *rblist 
__maybe_unused,
        struct metric_expr *expr, *tmp;
 
        list_for_each_entry_safe(expr, tmp, &me->head, nd) {
+               free(expr->metric_refs);
                free(expr);
        }
 
@@ -248,6 +249,7 @@ static int metricgroup__setup_events(struct list_head 
*groups,
 
        list_for_each_entry (eg, groups, nd) {
                struct evsel **metric_events;
+               struct metric_ref *metric_refs = NULL;
 
                metric_events = calloc(sizeof(void *),
                                hashmap__size(&eg->pctx.ids) + 1);
@@ -279,6 +281,36 @@ static int metricgroup__setup_events(struct list_head 
*groups,
                        free(metric_events);
                        break;
                }
+
+               /*
+                * Collect and store collected nested expressions
+                * for metric processing.
+                */
+               if (eg->metric_refs_cnt) {
+                       struct metric_ref_node *ref;
+
+                       metric_refs = zalloc(sizeof(struct metric_ref) * 
(eg->metric_refs_cnt + 1));
+                       if (!metric_refs) {
+                               ret = -ENOMEM;
+                               free(metric_events);
+                               break;
+                       }
+
+                       i = 0;
+                       list_for_each_entry(ref, &eg->metric_refs, list) {
+                               /*
+                                * Intentionally passing just const char 
pointers,
+                                * originally from 'struct pmu_event' object.
+                                * We don't need to change them, so there's no
+                                * need to create our own copy.
+                                */
+                               metric_refs[i].metric_name = ref->metric_name;
+                               metric_refs[i].metric_expr = ref->metric_expr;
+                               i++;
+                       }
+               };
+
+               expr->metric_refs = metric_refs;
                expr->metric_expr = eg->metric_expr;
                expr->metric_name = eg->metric_name;
                expr->metric_unit = eg->metric_unit;
diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
index 8315bd1a7da4..62623a39cbec 100644
--- a/tools/perf/util/metricgroup.h
+++ b/tools/perf/util/metricgroup.h
@@ -18,12 +18,18 @@ struct metric_event {
        struct list_head head; /* list of metric_expr */
 };
 
+struct metric_ref {
+       const char *metric_name;
+       const char *metric_expr;
+};
+
 struct metric_expr {
        struct list_head nd;
        const char *metric_expr;
        const char *metric_name;
        const char *metric_unit;
        struct evsel **metric_events;
+       struct metric_ref *metric_refs;
        int runtime;
 };
 
-- 
2.25.4