[RFC PATCH v3 3/6] 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>
---
 tools/perf/builtin-stat.c     |  1 +
 tools/perf/util/metricgroup.h |  1 +
 tools/perf/util/stat-shadow.c | 18 ++++++++++++++++++
 3 files changed, 20 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 3890a579349e..3e5865572266 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -792,6 +792,7 @@ static int process_sample_event(struct perf_tool *tool,
 		if (!strcmp(evname, t->name)) {
 			t->count += 1;
 			t->sum += sample->retire_lat;
+			t->val = t->count > 0 ? t->sum/t->count : 0;
 			break;
 		}
 	}
diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
index 1fa12cc3294e..08af0f447550 100644
--- a/tools/perf/util/metricgroup.h
+++ b/tools/perf/util/metricgroup.h
@@ -77,6 +77,7 @@ struct tpebs_retire_lat {
 	const char *tpebs_name;
 	size_t count;
 	int sum;
+	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..c63ba52004fc 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -355,6 +355,19 @@ 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, nd) {
+		ret = expr__add_id_val(pctx, strdup(t->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 +499,11 @@ 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