linux-kernel - [PATCH] perf test: Add parse-metric memory bandwidth testcase

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Date:   Mon, 25 Jan 2021 20:47:22 +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>, <irogers@...gle.com>,
        <kjain@...ux.ibm.com>
CC:     <linux-kernel@...r.kernel.org>, <linuxarm@...neuler.org>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH] perf test: Add parse-metric memory bandwidth testcase

Event duration_time in a metric expression requires special handling.

Improve test coverage by including a metric whose expression includes
duration_time. The actual metric is a copied from the L1D_Cache_Fill_BW
metric on my broadwell machine.

Signed-off-by: John Garry <john.garry@...wei.com>
---
Based on acme perf/core + "perf metricgroup: Fix for metrics containing duration_time"

diff --git a/tools/perf/tests/parse-metric.c b/tools/perf/tests/parse-metric.c
index ce7be37f0d88..6dc1db1626ad 100644
--- a/tools/perf/tests/parse-metric.c
+++ b/tools/perf/tests/parse-metric.c
@@ -69,6 +69,10 @@ static struct pmu_event pme_test[] = {
 	.metric_expr	= "1/m3",
 	.metric_name	= "M3",
 },
+{
+	.metric_expr	= "64 * l1d.replacement / 1000000000 / duration_time",
+	.metric_name	= "L1D_Cache_Fill_BW",
+},
 {
 	.name	= NULL,
 }
@@ -107,6 +111,8 @@ static void load_runtime_stat(struct runtime_stat *st, struct evlist *evlist,
 	evlist__for_each_entry(evlist, evsel) {
 		count = find_value(evsel->name, vals);
 		perf_stat__update_shadow_stats(evsel, count, 0, st);
+		if (!strcmp(evsel->name, "duration_time"))
+			update_stats(&walltime_nsecs_stats, count);
 	}
 }
 
@@ -321,6 +327,23 @@ static int test_recursion_fail(void)
 	return 0;
 }
 
+static int test_memory_bandwidth(void)
+{
+	double ratio;
+	struct value vals[] = {
+		{ .event = "l1d.replacement", .val = 4000000 },
+		{ .event = "duration_time",  .val = 200000000 },
+		{ .event = NULL, },
+	};
+
+	TEST_ASSERT_VAL("failed to compute metric",
+			compute_metric("L1D_Cache_Fill_BW", vals, &ratio) == 0);
+	TEST_ASSERT_VAL("L1D_Cache_Fill_BW, wrong ratio",
+			1.28 == ratio);
+
+	return 0;
+}
+
 static int test_metric_group(void)
 {
 	double ratio1, ratio2;
@@ -353,5 +376,6 @@ int test__parse_metric(struct test *test __maybe_unused, int subtest __maybe_unu
 	TEST_ASSERT_VAL("DCache_L2 failed", test_dcache_l2() == 0);
 	TEST_ASSERT_VAL("recursion fail failed", test_recursion_fail() == 0);
 	TEST_ASSERT_VAL("test metric group", test_metric_group() == 0);
+	TEST_ASSERT_VAL("Memory bandwidth", test_memory_bandwidth() == 0);
 	return 0;
 }
-- 
2.26.2