linux-kernel - [PATCH 17/22] selftests/resctrl: Pass the real number of tests to show_cache

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Message-Id: <20230412132122.29452-18-ilpo.jarvinen@linux.intel.com>
Date:   Wed, 12 Apr 2023 16:21:17 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Reinette Chatre <reinette.chatre@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 17/22] selftests/resctrl: Pass the real number of tests to show_cache_info()

Some results include warm-up tests which are discarded before passing
the sum to show_cache_info(). Currently, show_cache_info() handles this
by subtracting -1 from number of tests in divisor. It is a trappy
construct to have sum and number of tests parameters to disagree like
this.

A more logical place for subtracting the skipped tests is where the sum
is calculated so move it there. Pass the correct number of tests to
show_cache_info() soit can use directly as the divisor for calculating
the average.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 tools/testing/selftests/resctrl/cache.c    | 2 +-
 tools/testing/selftests/resctrl/cat_test.c | 2 +-
 tools/testing/selftests/resctrl/cmt_test.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 5e59c239961c..835d5a892524 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -312,7 +312,7 @@ int show_cache_info(unsigned long sum_llc_val, int no_of_bits,
 	long avg_diff = 0;
 	int ret;
 
-	avg_llc_val = sum_llc_val / (num_of_runs - 1);
+	avg_llc_val = sum_llc_val / num_of_runs;
 	avg_diff = (long)abs(cache_span - avg_llc_val);
 	diff_percent = ((float)cache_span - avg_llc_val) / cache_span * 100;
 
diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index 2b5333ad13bb..edcc340744d7 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -81,7 +81,7 @@ static int check_results(struct resctrl_val_param *param)
 	no_of_bits = count_consecutive_bits(param->mask, NULL);
 
 	return show_cache_info(sum_llc_perf_miss, no_of_bits, param->span / 64,
-			       MAX_DIFF, MAX_DIFF_PERCENT, NUM_OF_RUNS,
+			       MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
 			       get_vendor() == ARCH_INTEL, false);
 }
 
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index 15e824ada9b5..70c656581686 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -63,7 +63,7 @@ static int check_results(struct resctrl_val_param *param, int no_of_bits)
 	fclose(fp);
 
 	return show_cache_info(sum_llc_occu_resc, no_of_bits, param->span,
-			       MAX_DIFF, MAX_DIFF_PERCENT, NUM_OF_RUNS,
+			       MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
 			       true, true);
 }
 
-- 
2.30.2