linux-kernel - [PATCH 2/4] selftests/resctrl: Don't hard code divisor in MBM results

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Date:   Wed,  8 Feb 2023 11:40:24 +0200
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>
Subject: [PATCH 2/4] selftests/resctrl: Don't hard code divisor in MBM results

From: Fenghua Yu <fenghua.yu@...el.com>

Presently, while calculating MBM results, the divisor is hard coded as 4.
It's hard coded to 4 because "NUM_OF_RUNS" is defined as 5 and the test
does not count first result and hence 4. So, instead of hard coding the
value to 4, change it to NUM_OF_RUNS - 1.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 tools/testing/selftests/resctrl/mbm_test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index 8392e5c55ed0..4f85cbbfd037 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -31,8 +31,8 @@ show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, int span)
 		sum_bw_resc += bw_resc[runs];
 	}
 
-	avg_bw_imc = sum_bw_imc / 4;
-	avg_bw_resc = sum_bw_resc / 4;
+	avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1);
+	avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1);
 	avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
 	avg_diff_per = (int)(avg_diff * 100);
 
-- 
2.30.2