linux-kernel - [PATCH 06/18] perf metric: Add find

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Date:   Sun, 12 Jul 2020 15:26:22 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH 06/18] perf metric: Add find_metric function

Decouple lookup metric logic into find_metric function,
so it can be used from other places in following changes.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/metricgroup.c | 89 +++++++++++++++++++----------------
 1 file changed, 48 insertions(+), 41 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index df0356ec120d..72552608ff7d 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -614,57 +614,64 @@ static int __metricgroup__add_metric(struct list_head *group_list,
 	return 0;
 }
 
-static int metricgroup__add_metric(const char *metric, bool metric_no_group,
-				   struct strbuf *events,
-				   struct list_head *group_list,
-				   struct pmu_events_map *map)
+static struct pmu_event *find_metric(const char *metric, struct pmu_events_map *map)
 {
 	struct pmu_event *pe;
-	struct egroup *eg;
-	int i, ret;
-	bool has_match = false;
+	int i;
 
 	for (i = 0; ; i++) {
 		pe = &map->table[i];
-
-		if (!pe->name && !pe->metric_group && !pe->metric_name) {
-			/* End of pmu events. */
-			if (!has_match)
-				return -EINVAL;
+		/* End of pmu events. */
+		if (!pe->name && !pe->metric_group && !pe->metric_name)
 			break;
-		}
 		if (!pe->metric_expr)
 			continue;
 		if (match_metric(pe->metric_group, metric) ||
-		    match_metric(pe->metric_name, metric)) {
-			has_match = true;
-			pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
-
-			if (!strstr(pe->metric_expr, "?")) {
-				ret = __metricgroup__add_metric(group_list,
-								pe,
-								metric_no_group,
-								1);
-				if (ret)
-					return ret;
-			} else {
-				int j, count;
-
-				count = arch_get_runtimeparam();
-
-				/* This loop is added to create multiple
-				 * events depend on count value and add
-				 * those events to group_list.
-				 */
+		    match_metric(pe->metric_name, metric))
+			return pe;
+	}
 
-				for (j = 0; j < count; j++) {
-					ret = __metricgroup__add_metric(
-						group_list, pe,
-						metric_no_group, j);
-					if (ret)
-						return ret;
-				}
-			}
+	return NULL;
+}
+
+static int metricgroup__add_metric(const char *metric, bool metric_no_group,
+				   struct strbuf *events,
+				   struct list_head *group_list,
+				   struct pmu_events_map *map)
+{
+	struct pmu_event *pe;
+	struct egroup *eg;
+	int ret;
+
+	pe = find_metric(metric, map);
+	if (!pe)
+		return -EINVAL;
+
+	pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
+
+	if (!strstr(pe->metric_expr, "?")) {
+		ret = __metricgroup__add_metric(group_list,
+						pe,
+						metric_no_group,
+						1);
+		if (ret)
+			return ret;
+	} else {
+		int j, count;
+
+		count = arch_get_runtimeparam();
+
+		/* This loop is added to create multiple
+		 * events depend on count value and add
+		 * those events to group_list.
+		 */
+
+		for (j = 0; j < count; j++) {
+			ret = __metricgroup__add_metric(
+				group_list, pe,
+				metric_no_group, j);
+			if (ret)
+				return ret;
 		}
 	}
 	list_for_each_entry(eg, group_list, nd) {
-- 
2.25.4