Re: [PATCH] perf metricgroup: Fix for metrics containing duration_time

[John Garry]

     >
     >
     > Thanks for this, it should be fairly easy to add a test. Could we
    do this?

    I don't mind following up with that.

How about this:

---- >8 ----

From 38e9d5aa07588d552378d97760b6b79f19d59bbd Mon Sep 17 00:00:00 2001
From: John Garry <john.ga...@huawei.com>
Date: Thu, 21 Jan 2021 16:55:17 +0000
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 copied from the L1D_Cache_Fill_BW
metric on my broadwell machine.

Signed-off-by: John Garry <john.ga...@huawei.com>

diff --git a/tools/perf/tests/parse-metric.c 
b/tools/perf/tests/parse-metric.c
index ce7be37f0d88..98b9570c6194 100644
--- a/tools/perf/tests/parse-metric.c
+++ b/tools/perf/tests/parse-metric.c
@@ -11,6 +11,7 @@
 #include "debug.h"
 #include "expr.h"
 #include "stat.h"
+#include <math.h>

 static struct pmu_event pme_test[] = {
 {
@@ -69,6 +70,10 @@ 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 +112,8 @@ 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 +328,24 @@ static int test_recursion_fail(void)
        return 0;
 }

+static int test_memory_bandwidth(void)
+{
+       double ratio;
+       struct value vals[] = {
+               { .event = "l1d.replacement", .val = 304334545 },
+               { .event = "duration_time",  .val = 1001057587 },
+               { .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",
+                       fabs(ratio - 19.45) < 0.01);
+
+       return 0;
+}
+
 static int test_metric_group(void)
 {
        double ratio1, ratio2;
@@ -353,5 +378,6 @@ 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

Cheers,
John