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Message-ID: <3cf87836-1fb7-4706-86ff-267383a8d914@kernel.org>
Date: Fri, 20 Feb 2026 09:19:41 -0700
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Subject: Re: [PATCH] cpupower: Add support for setting EPP via systemd service
To: Jan Kiszka <jan.kiszka@siemens.com>, Thomas Renninger <trenn@suse.com>,
 Shuah Khan <shuah@kernel.org>, "John B. Wyatt IV" <jwyatt@redhat.com>,
 John Kacur <jkacur@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
 shuah <shuah@kernel.org>
References: <aa240c08-9dc9-4e2f-a890-57ba9731fbb8@siemens.com>
Content-Language: en-US
From: Shuah <shuah@kernel.org>
In-Reply-To: <aa240c08-9dc9-4e2f-a890-57ba9731fbb8@siemens.com>
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On 2/14/26 04:12, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@siemens.com>
> 
> Extend the systemd service so that it can be used for tuning the Energy
> Performance Preference (EPP) as well.

How would users use this support? Add a few lines to help them.

> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
>   tools/power/cpupower/cpupower-service.conf | 5 +++++
>   tools/power/cpupower/cpupower.sh           | 6 ++++++
>   2 files changed, 11 insertions(+)
> 
> diff --git a/tools/power/cpupower/cpupower-service.conf b/tools/power/cpupower/cpupower-service.conf
> index 02eabe8e3614..abbb46967565 100644
> --- a/tools/power/cpupower/cpupower-service.conf
> +++ b/tools/power/cpupower/cpupower-service.conf
> @@ -30,3 +30,8 @@
>   # its policy for the relative importance of performance versus energy savings to
>   # the processor. See man CPUPOWER-SET(1) for additional details
>   #PERF_BIAS=
> +
> +# Set the Energy Performance Preference
> +# Available options can be read from
> +# /sys/devices/system/cpu/cpufreq/policy0/energy_performance_available_preferences
> +#EPP=
> diff --git a/tools/power/cpupower/cpupower.sh b/tools/power/cpupower/cpupower.sh
> index a37dd4cfdb2b..6283e8bf275d 100644
> --- a/tools/power/cpupower/cpupower.sh
> +++ b/tools/power/cpupower/cpupower.sh
> @@ -23,4 +23,10 @@ then
>       cpupower set -b "$PERF_BIAS" > /dev/null || ESTATUS=1
>   fi
>   
> +# apply Energy Performance Preference
> +if test -n "$EPP"
> +then
> +    cpupower set -e "$EPP" > /dev/null || ESTATUS=1
> +fi
> +
>   exit $ESTATUS

thanks,
-- Shuah