perf test: Use full metric resolution

The simple metric resolution doesn't handle recursion properly, switch
to use the full resolution as with the parse-metric tests which also
increases coverage. Don't set the values for the metric backward as
failures to generate a result are ignored.

Signed-off-by: Ian Rogers <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: John Garry <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Mike Leach <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Ravi Bangoria <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Xing Zhengjun <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/pmu-events.c

···
 #include <linux/zalloc.h>
 #include "debug.h"
 #include "../pmu-events/pmu-events.h"
+#include <perf/evlist.h>
 #include "util/evlist.h"
 #include "util/expr.h"
 #include "util/parse-events.h"
 #include "metricgroup.h"
+#include "stat.h"
 
 struct perf_pmu_test_event {
 	/* used for matching against events from generated pmu-events.c */
···
 	return ret;
 }
 
-static int check_parse_cpu(const char *id, bool same_cpu, const struct pmu_event *pe)
-{
-	struct parse_events_error error;
-	int ret;
-
-	parse_events_error__init(&error);
-	ret = check_parse_id(id, &error, NULL);
-	if (ret && same_cpu) {
-		pr_warning("Parse event failed metric '%s' id '%s' expr '%s'\n",
-			pe->metric_name, id, pe->metric_expr);
-		pr_warning("Error string '%s' help '%s'\n", error.str,
-			error.help);
-	} else if (ret) {
-		pr_debug3("Parse event failed, but for an event that may not be supported by this CPU.\nid '%s' metric '%s' expr '%s'\n",
-			  id, pe->metric_name, pe->metric_expr);
-		ret = 0;
-	}
-	parse_events_error__exit(&error);
-	return ret;
-}
-
 static int check_parse_fake(const char *id)
 {
 	struct parse_events_error error;
···
 	struct metric_ref metric_ref;
 };
 
-static int resolve_metric_simple(struct expr_parse_ctx *pctx,
-				 struct list_head *compound_list,
-				 const struct pmu_event *map,
-				 const char *metric_name)
-{
-	struct hashmap_entry *cur, *cur_tmp;
-	struct metric *metric, *tmp;
-	size_t bkt;
-	bool all;
-	int rc;
-
-	do {
-		all = true;
-		hashmap__for_each_entry_safe(pctx->ids, cur, cur_tmp, bkt) {
-			struct metric_ref *ref;
-			const struct pmu_event *pe;
-
-			pe = metricgroup__find_metric(cur->key, map);
-			if (!pe)
-				continue;
-
-			if (!strcmp(metric_name, (char *)cur->key)) {
-				pr_warning("Recursion detected for metric %s\n", metric_name);
-				rc = -1;
-				goto out_err;
-			}
-
-			all = false;
-
-			/* The metric key itself needs to go out.. */
-			expr__del_id(pctx, cur->key);
-
-			metric = malloc(sizeof(*metric));
-			if (!metric) {
-				rc = -ENOMEM;
-				goto out_err;
-			}
-
-			ref = &metric->metric_ref;
-			ref->metric_name = pe->metric_name;
-			ref->metric_expr = pe->metric_expr;
-			list_add_tail(&metric->list, compound_list);
-
-			rc = expr__find_ids(pe->metric_expr, NULL, pctx);
-			if (rc)
-				goto out_err;
-			break; /* The hashmap has been modified, so restart */
-		}
-	} while (!all);
-
-	return 0;
-
-out_err:
-	list_for_each_entry_safe(metric, tmp, compound_list, list)
-		free(metric);
-
-	return rc;
-
-}
-
-static void expr_failure(const char *msg, const struct pmu_event *pe)
-{
-	pr_debug("%s\nOn metric %s\nOn expression %s\n", msg, pe->metric_name, pe->metric_expr);
-}
-
-
-struct test__parsing_data {
-	const struct pmu_event *cpus_table;
-	struct expr_parse_ctx *ctx;
-	int failures;
-};
-
 static int test__parsing_callback(const struct pmu_event *pe, const struct pmu_event *table,
-				  void *vdata)
+				  void *data)
 {
-	struct test__parsing_data *data = vdata;
-	struct metric *metric, *tmp;
-	struct hashmap_entry *cur;
-	LIST_HEAD(compound_list);
-	size_t bkt;
+	int *failures = data;
 	int k;
-	double result;
+	struct evlist *evlist;
+	struct perf_cpu_map *cpus;
+	struct runtime_stat st;
+	struct evsel *evsel;
+	struct rblist metric_events = {
+		.nr_entries = 0,
+	};
+	int err = 0;
 
 	if (!pe->metric_expr)
 		return 0;
 
 	pr_debug("Found metric '%s'\n", pe->metric_name);
+	(*failures)++;
 
-	expr__ctx_clear(data->ctx);
-	if (expr__find_ids(pe->metric_expr, NULL, data->ctx) < 0) {
-		expr_failure("Parse find ids failed", pe);
-		data->failures++;
-		return 0;
+	/*
+	 * We need to prepare evlist for stat mode running on CPU 0
+	 * because that's where all the stats are going to be created.
+	 */
+	evlist = evlist__new();
+	if (!evlist)
+		return -ENOMEM;
+
+	cpus = perf_cpu_map__new("0");
+	if (!cpus) {
+		evlist__delete(evlist);
+		return -ENOMEM;
 	}
 
-	if (resolve_metric_simple(data->ctx, &compound_list, table,
-				  pe->metric_name)) {
-		expr_failure("Could not resolve metrics", pe);
-		data->failures++;
-		return TEST_FAIL; /* Don't tolerate errors due to severity */
+	perf_evlist__set_maps(&evlist->core, cpus, NULL);
+	runtime_stat__init(&st);
+
+	err = metricgroup__parse_groups_test(evlist, table, pe->metric_name,
+					     false, false,
+					     &metric_events);
+	if (err) {
+		if (!strcmp(pe->metric_name, "M1") || !strcmp(pe->metric_name, "M2") ||
+		    !strcmp(pe->metric_name, "M3")) {
+			(*failures)--;
+			pr_debug("Expected broken metric %s skipping\n", pe->metric_name);
+			err = 0;
+		}
+		goto out_err;
 	}
 
+	err = evlist__alloc_stats(evlist, false);
+	if (err)
+		goto out_err;
 	/*
 	 * Add all ids with a made up value. The value may trigger divide by
 	 * zero when subtracted and so try to make them unique.
 	 */
 	k = 1;
-	hashmap__for_each_entry(data->ctx->ids, cur, bkt)
-		expr__add_id_val(data->ctx, strdup(cur->key), k++);
-
-	hashmap__for_each_entry(data->ctx->ids, cur, bkt) {
-		if (check_parse_cpu(cur->key, table == data->cpus_table, pe))
-			data->failures++;
+	perf_stat__reset_shadow_stats();
+	evlist__for_each_entry(evlist, evsel) {
+		perf_stat__update_shadow_stats(evsel, k, 0, &st);
+		if (!strcmp(evsel->name, "duration_time"))
+			update_stats(&walltime_nsecs_stats, k);
+		k++;
 	}
+	evlist__for_each_entry(evlist, evsel) {
+		struct metric_event *me = metricgroup__lookup(&metric_events, evsel, false);
 
-	list_for_each_entry_safe(metric, tmp, &compound_list, list) {
-		expr__add_ref(data->ctx, &metric->metric_ref);
-		free(metric);
-	}
+		if (me != NULL) {
+			struct metric_expr *mexp;
 
-	if (expr__parse(&result, data->ctx, pe->metric_expr)) {
-		/*
-		 * Parsing failed, make numbers go from large to small which can
-		 * resolve divide by zero issues.
-		 */
-		k = 1024;
-		hashmap__for_each_entry(data->ctx->ids, cur, bkt)
-			expr__add_id_val(data->ctx, strdup(cur->key), k--);
-		if (expr__parse(&result, data->ctx, pe->metric_expr)) {
-			expr_failure("Parse failed", pe);
-			data->failures++;
+			list_for_each_entry (mexp, &me->head, nd) {
+				if (strcmp(mexp->metric_name, pe->metric_name))
+					continue;
+				pr_debug("Result %f\n", test_generic_metric(mexp, 0, &st));
+				err = 0;
+				(*failures)--;
+				goto out_err;
+			}
 		}
 	}
-	return 0;
+	pr_debug("Didn't find parsed metric %s", pe->metric_name);
+	err = 1;
+out_err:
+	if (err)
+		pr_debug("Broken metric %s\n", pe->metric_name);
+
+	/* ... cleanup. */
+	metricgroup__rblist_exit(&metric_events);
+	runtime_stat__exit(&st);
+	evlist__free_stats(evlist);
+	perf_cpu_map__put(cpus);
+	evlist__delete(evlist);
+	return err;
 }
 
 static int test__parsing(struct test_suite *test __maybe_unused,
 			 int subtest __maybe_unused)
 {
-	struct test__parsing_data data = {
-		.cpus_table = pmu_events_table__find(),
-		.ctx = expr__ctx_new(),
-		.failures = 0,
-	};
+	int failures = 0;
 
-	if (!data.ctx) {
-		pr_debug("expr__ctx_new failed");
-		return TEST_FAIL;
-	}
-	pmu_for_each_core_event(test__parsing_callback, &data);
-	pmu_for_each_sys_event(test__parsing_callback, &data);
+	pmu_for_each_core_event(test__parsing_callback, &failures);
+	pmu_for_each_sys_event(test__parsing_callback, &failures);
 
-	expr__ctx_free(data.ctx);
-	return data.failures == 0 ? TEST_OK : TEST_FAIL;
+	return failures == 0 ? TEST_OK : TEST_FAIL;
 }
 
 struct test_metric {