kernel/linux.git/tools/power/cpupower, branch master

cpupower: remove extern declarations in cmd functions

2026-04-06T17:25:32+00:00

extern char *optarg and extern int optind, opterr, optopt are already declared by , which is included at the top of the file. Repeating extern declarations inside a function body is misleading and unnecessary. Signed-off-by: Kaushlendra Kumar Signed-off-by: Shuah Khan

cpupower-info.1: describe the --perf-bias option

2026-03-25T19:36:11+00:00

The cpupower-info(1) man page only mentions the short form of the '--perf-bias' option in the synopsys, but the long form is not documented and its effect is not explained. cpupower-info.c: {"perf-bias", optional_argument, NULL, 'b'}, Signed-off-by: Roberto Ricci Link: https://lore.kernel.org/r/20260324223921.14317-5-io@r-ricci.it Signed-off-by: Shuah Khan

cpupower-frequency-info.1: document --boost and --epp options

2026-03-25T19:36:11+00:00

`cpupower frequency-info` supports the '--boost' option since the program was first added with commit 7fe2f6399a84 ("cpupowerutils - cpufrequtils extended with quite some features"), but the man page lacks it. '--epp' has been added with commit 5f567afc283f ("cpupower: Add support for showing energy performance preference") but it has never been added to the man page. cpufreq-info.c: {"boost", no_argument, NULL, 'b'}, ... {"epp", no_argument, NULL, 'z'}, Signed-off-by: Roberto Ricci Link: https://lore.kernel.org/r/20260324223921.14317-4-io@r-ricci.it Signed-off-by: Shuah Khan

cpupower-frequency-info.1: use the proper name of the --perf option

2026-03-25T19:36:11+00:00

The cpupower-frequency-info(1) man page describes a '--perf' option. Even though this form is accepted by the program, its proper name is '--performance'. cpufreq-info.c: {"performance", no_argument, NULL, 'c'}, Signed-off-by: Roberto Ricci Link: https://lore.kernel.org/r/20260324223921.14317-3-io@r-ricci.it Signed-off-by: Shuah Khan

cpupower-idle-info.1: fix short option names

2026-03-25T19:36:11+00:00

The cpupower-idle-info(1) man page describes '-f' as the short form of the '--silent' option and '-e' as the short form of the '--proc' option. But they are not correct: $ cpupower idle-info -f idle-info: invalid option -- 'f' invalid or unknown argument $ cpupower idle-info -e idle-info: invalid option -- 'e' invalid or unknown argument The short form of '--silent' is actually '-s' and the short form of '--proc' is actually '-o': cpuidle-info.c: {"silent", no_argument, NULL, 's'}, {"proc", no_argument, NULL, 'o'}, Signed-off-by: Roberto Ricci Link: https://lore.kernel.org/r/20260324223921.14317-2-io@r-ricci.it Signed-off-by: Shuah Khan

cpupower: Add intel_pstate turbo boost support for Intel platforms

2026-03-03T18:18:53+00:00

On modern Intel platforms, the intel_pstate driver is commonly used and it provides turbo boost control via /sys/devices/system/cpu/intel_pstate/no_turbo. However, cpupower doesn't handle this. it 1. shows turbo boost as "active" blindly for Intel platforms 2. controls turbo boost functionality via the generic /sys/devices/system/cpu/cpufreq/boost sysfs interface only. Enhance the cpupower tool to ensure the "--boost" command works seamlessly on Intel platforms with intel_pstate driver running. Without this patch, $ echo 1 | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo 1 $ sudo cpupower frequency-info --boost analyzing CPU 21: boost state support: Supported: yes Active: yes $ sudo cpupower set --boost 0 Error setting turbo-boost $ sudo cpupower set --boost 1 Error setting turbo-boost With this patch, $ cat /sys/devices/system/cpu/intel_pstate/no_turbo 0 $ sudo cpupower set --boost 0 $ sudo cpupower frequency-info --boost analyzing CPU 21: boost state support: Supported: yes Active: no $ cat /sys/devices/system/cpu/intel_pstate/no_turbo 1 $ sudo cpupower set --boost 1 $ sudo cpupower frequency-info --boost analyzing CPU 28: boost state support: Supported: yes Active: yes $ cat /sys/devices/system/cpu/intel_pstate/no_turbo 0 Signed-off-by: Zhang Rui Signed-off-by: Shuah Khan

cpupower: Add support for setting EPP via systemd service

2026-03-03T18:07:06+00:00

Extend the systemd service so that it can be used for tuning the Energy Performance Preference (EPP) as well. Available options can be read from /sys/devices/system/cpu/cpufreq/policy0/energy_performance_available_preferences. The desired one can then be set in cpupower-service.conf. Signed-off-by: Jan Kiszka Signed-off-by: Shuah Khan

cpupower: fix swapped power/energy unit labels

2026-02-28T20:13:49+00:00

Fix error where microWatts and microJoules units were interchanged. Signed-off-by: Kaushlendra Kumar Signed-off-by: Shuah Khan

cpupower: make systemd unit installation optional

2026-01-16T20:41:26+00:00

cpupower currently installs a cpupower.service unit file into unitdir unconditionally, regardless of whether systemd is used by the host. Improve the installation procedure by making this systemd step optional: a 'SYSTEMD' build parameter that defaults to 'true' and can be set to 'false' to disable the installation of systemd's unit file. Since 'SYSTEMD' defaults to true, the current behavior is kept as the default. Link: https://lore.kernel.org/r/20260113132753.1730020-2-joaomarcos.costa@bootlin.com Signed-off-by: João Marcos Costa Signed-off-by: Shuah Khan

tools/power cpupower: Show C0 in idle-info dump

2025-12-15T19:33:29+00:00

`cpupower idle-info -o` skipped C0 because the loop began at 1: before: states: C1 ... latency[002] residency[00002] C2 ... latency[010] residency[00020] C3 ... latency[133] residency[00600] after: states: C0 ... latency[000] residency[00000] C1 ... latency[002] residency[00002] C2 ... latency[010] residency[00020] C3 ... latency[133] residency[00600] Start iterating at index 0 so the idle report mirrors sysfs and includes C0 stats. Link: https://lore.kernel.org/r/20251202065403.1492807-1-kaushlendra.kumar@intel.com Signed-off-by: Kaushlendra Kumar Signed-off-by: Shuah Khan