linux-kernel - [PATCH RFC v3 09/12] perf metricgroup: Split up metricgroup__add

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Date:   Thu, 7 May 2020 19:57:48 +0800
From:   John Garry <john.garry@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...hat.com>, <namhyung@...nel.org>
CC:     <will@...nel.org>, <ak@...ux.intel.com>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>, <qiangqing.zhang@....com>,
        <irogers@...gle.com>, <robin.murphy@....com>,
        <zhangshaokun@...ilicon.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH RFC v3 09/12] perf metricgroup: Split up metricgroup__add_metric()

To aid supporting system event metric groups, break up the function
metricgroup__add_metric() into a part which iterates metrics and a part
which actually "adds" the metric.

No functional change intended.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 tools/perf/util/metricgroup.c | 75 ++++++++++++++++++++++++++-----------------
 1 file changed, 45 insertions(+), 30 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 926449a7cdbf..d1033756a1bc 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -231,6 +231,12 @@ static bool match_metric(const char *n, const char *list)
 	return false;
 }
 
+static bool match_pe_metric(struct pmu_event *pe, const char *metric)
+{
+	return match_metric(pe->metric_group, metric) ||
+	       match_metric(pe->metric_name, metric);
+}
+
 struct mep {
 	struct rb_node nd;
 	const char *name;
@@ -485,6 +491,40 @@ static bool metricgroup__has_constraint(struct pmu_event *pe)
 	return false;
 }
 
+static int metricgroup__add_metric_pmu_event(struct pmu_event *pe,
+					     struct strbuf *events,
+					     struct list_head *group_list)
+{
+	const char **ids;
+	int idnum;
+	struct egroup *eg;
+
+	pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
+
+	if (expr__find_other(pe->metric_expr, NULL, &ids, &idnum) < 0)
+		return 0;
+
+	if (events->len > 0)
+		strbuf_addf(events, ",");
+
+	if (metricgroup__has_constraint(pe))
+		metricgroup__add_metric_non_group(events, ids, idnum);
+	else
+		metricgroup__add_metric_weak_group(events, ids, idnum);
+
+	eg = malloc(sizeof(*eg));
+	if (!eg)
+		return -ENOMEM;
+	eg->ids = ids;
+	eg->idnum = idnum;
+	eg->metric_name = pe->metric_name;
+	eg->metric_expr = pe->metric_expr;
+	eg->metric_unit = pe->unit;
+	list_add_tail(&eg->nd, group_list);
+
+	return 0;
+}
+
 static int metricgroup__add_metric(const char *metric, struct strbuf *events,
 				   struct list_head *group_list)
 {
@@ -502,37 +542,12 @@ static int metricgroup__add_metric(const char *metric, struct strbuf *events,
 			break;
 		if (!pe->metric_expr)
 			continue;
-		if (match_metric(pe->metric_group, metric) ||
-		    match_metric(pe->metric_name, metric)) {
-			const char **ids;
-			int idnum;
-			struct egroup *eg;
-
-			pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
 
-			if (expr__find_other(pe->metric_expr,
-					     NULL, &ids, &idnum) < 0)
-				continue;
-			if (events->len > 0)
-				strbuf_addf(events, ",");
-
-			if (metricgroup__has_constraint(pe))
-				metricgroup__add_metric_non_group(events, ids, idnum);
-			else
-				metricgroup__add_metric_weak_group(events, ids, idnum);
-
-			eg = malloc(sizeof(struct egroup));
-			if (!eg) {
-				ret = -ENOMEM;
-				break;
-			}
-			eg->ids = ids;
-			eg->idnum = idnum;
-			eg->metric_name = pe->metric_name;
-			eg->metric_expr = pe->metric_expr;
-			eg->metric_unit = pe->unit;
-			list_add_tail(&eg->nd, group_list);
-			ret = 0;
+		if (match_pe_metric(pe, metric)) {
+			ret = metricgroup__add_metric_pmu_event(pe, events,
+								group_list);
+			if (ret)
+				return ret;
 		}
 	}
 	return ret;
-- 
2.16.4