[RFC PATCH v6 3/5] perf stat: Add retire latency values into the expr_parse_ctx to prepare for final metric calculation

[weilin . wang]

From: Weilin Wang <weilin.wang@xxxxxxxxx>

Retire latency values of events are used in metric formulas. This update adds
code to process data from perf record for required retire latency values.

Signed-off-by: Weilin Wang <weilin.wang@xxxxxxxxx>
Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/perf/builtin-stat.c     |  1 +
 tools/perf/util/metricgroup.h |  4 ++++
 tools/perf/util/stat-shadow.c | 19 +++++++++++++++++++
 3 files changed, 24 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 7fbe47b0c44c..4954ff84c407 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -798,6 +798,7 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
 		if (!strcmp(evname, t->event.name)) {
 			t->count += 1;
 			t->sum += sample->retire_lat;
+			t->val = (double) t->sum / t->count;
 			break;
 		}
 	}
diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
index ae788edef30f..d63209b29bf1 100644
--- a/tools/perf/util/metricgroup.h
+++ b/tools/perf/util/metricgroup.h
@@ -76,8 +76,12 @@ struct tpebs_event {
 
 struct tpebs_retire_lat {
 	struct tpebs_event event;
+	/* Count of retire_latency values found in sample data */
 	size_t count;
+	/* Sum of all the retire_latency values in sample data */
 	int sum;
+	/* Average of retire_latency, val = sum / count */
+	double val;
 };
 
 struct metric_event *metricgroup__lookup(struct rblist *metric_events,
diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 3466aa952442..bc77e9e02892 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -355,6 +355,20 @@ static void print_nsecs(struct perf_stat_config *config,
 		print_metric(config, ctxp, NULL, NULL, "CPUs utilized", 0);
 }
 
+static int prepare_retire_lat(struct expr_parse_ctx *pctx,
+			     struct list_head *retire_lats)
+{
+	int ret = 0;
+	struct tpebs_retire_lat *t;
+
+	list_for_each_entry(t, retire_lats, event.nd) {
+		ret = expr__add_id_val(pctx, strdup(t->event.tpebs_name), t->val);
+		if (ret < 0)
+			return ret;
+	}
+	return ret;
+}
+
 static int prepare_metric(const struct metric_expr *mexp,
 			  const struct evsel *evsel,
 			  struct expr_parse_ctx *pctx,
@@ -486,6 +500,11 @@ static void generic_metric(struct perf_stat_config *config,
 		pctx->sctx.user_requested_cpu_list = strdup(config->user_requested_cpu_list);
 	pctx->sctx.runtime = runtime;
 	pctx->sctx.system_wide = config->system_wide;
+	i = prepare_retire_lat(pctx, &config->tpebs_results);
+	if (i < 0) {
+		expr__ctx_free(pctx);
+		return;
+	}
 	i = prepare_metric(mexp, evsel, pctx, aggr_idx);
 	if (i < 0) {
 		expr__ctx_free(pctx);
-- 
2.43.0