linux-kernel - [PATCH -next 1/2] selftests/intel_pstate: Add saving and restore of scaling

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Date:   Thu, 8 Dec 2022 21:08:04 +0800
From:   Zhao Gongyi <zhaogongyi@...wei.com>
To:     <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <shuah@...nel.org>
CC:     <zhaogongyi@...wei.com>
Subject: [PATCH -next 1/2] selftests/intel_pstate: Add saving and restore of scaling_governor

Add saving and restore of scaling_governor for cpus, otherwise the
cpus will run in the policy of powersave, and it would reduce the
performance as unexpected.

Signed-off-by: Zhao Gongyi <zhaogongyi@...wei.com>
---
 tools/testing/selftests/intel_pstate/run.sh | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tools/testing/selftests/intel_pstate/run.sh b/tools/testing/selftests/intel_pstate/run.sh
index e7008f614ad7..ee78c61cccb9 100755
--- a/tools/testing/selftests/intel_pstate/run.sh
+++ b/tools/testing/selftests/intel_pstate/run.sh
@@ -46,6 +46,12 @@ fi

 max_cpus=$(($(nproc)-1))

+# Save the scaling_governor
+for i in `seq 0 $max_cpus`
+do
+	cat /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor >> /tmp/governor
+done
+
 function run_test () {

 	file_ext=$1
@@ -125,4 +131,14 @@ done
 # print the table
 pr -aTt -5 < /tmp/result.tab

+# restore the scaling_governor
+i=0
+while read line
+do
+	echo $line > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor
+	let i=$i+1
+done < /tmp/governor
+
+rm -f /tmp/governor
+
 exit 0
--
2.17.1