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This >> + file conveys the minimum performance level (as frequency) at >> + which the platform may run. The frequency value is internally >> + converted to a performance value and must correspond to a >> + performance level in the range [Lowest Performance, Highest >> + Performance], inclusive. The minimum must be less than or equal >> + to the maximum performance. The performance range can be checked >> + from nodes: >> + /sys/devices/system/cpu/cpuX/acpi_cppc/highest_perf >> + /sys/devices/system/cpu/cpuX/acpi_cppc/lowest_perf > I think information on highest/lowest performance is irrelevant here. If > the user is expected to provide a frequency value, it should only care > about it being in the range [cpuinfo_min_freq, cpuinfo_max_freq]. Will change it as below:   Read/write a frequency value in kHz from/to this file. This   file sets the minimum performance level (as frequency) at   which the platform may run. The frequency value is internally   converted to a performance value and must be in the range   [cpuinfo_min_freq, cpuinfo_max_freq], inclusive.   This file is only present if the cppc-cpufreq driver is in use. > I think ideally all of these controls (auto-select, EPP, min, max, etc.) > would have been better placed under > /sys/devices/system/cpu/cpuX/acpi_cppc, but I suppose the intention > was/is to have all performance related controls under cpufreq. But that > means that the user should not be concerned about the underlying CPPC > scale and only use /sys/devices/system/cpu/cpuX/acpi_cppc for > information purposes. > > Thanks, > Ionela. > In v1[1], added these controls under acpi_cppc sysfs. Later after discussion, it was decided to keep them under cpufreq sysfs and [2] was merged first. [1] https://lore.kernel.org/lkml/20250211103737.447704-1-sumitg@nvidia.com/ [2] https://lore.kernel.org/all/20250507031941.2812701-1-zhenglifeng1@huawei.com/ Thank you, Sumit Gupta