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Wysocki" Cc: rafael@kernel.org, viresh.kumar@linaro.org, ionela.voinescu@arm.com, lenb@kernel.org, robert.moore@intel.com, corbet@lwn.net, rdunlap@infradead.org, ray.huang@amd.com, gautham.shenoy@amd.com, mario.limonciello@amd.com, perry.yuan@amd.com, zhanjie9@hisilicon.com, linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, acpica-devel@lists.linux.dev, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, treding@nvidia.com, jonathanh@nvidia.com, vsethi@nvidia.com, ksitaraman@nvidia.com, sanjayc@nvidia.com, nhartman@nvidia.com, bbasu@nvidia.com, sumitg@nvidia.com References: <20260129104817.3752340-1-sumitg@nvidia.com> <20260129104817.3752340-5-sumitg@nvidia.com> <4432fa04-e67c-422a-aae4-2938be431985@huawei.com> <74f3e6cf-7c13-43e6-a8f6-2b46184b8ad6@gmail.com> Content-Language: en-US From: Sumit Gupta In-Reply-To: <74f3e6cf-7c13-43e6-a8f6-2b46184b8ad6@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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=?utf-8?B?ejgwUkJWWnVVZUkrVys5QzE1N1lINkNGSnNXUlNBL3hyODNiNCtabzZ6SXdu?= =?utf-8?B?VTE3cXh2TzRxVmVsNHVweDVyRTRPNFNoNE5aL1UxNWNiaU9vWVkybTdpbExk?= =?utf-8?B?ZzlNWmh0bU02QmZIeWg0MEdlNXNrWFhyaStnRzI5c1NqRmFvMHZ4S1ZZY3Jo?= =?utf-8?B?cEp5Q3RIYmNvVCtKRVZqR0tIejZKR2NLNnNYMlRiOXJwWlNDaVN6dmNySUMr?= =?utf-8?B?WHhLOUZvWkk3aUVoc2U0ZkRGVHNtejBTVVgvQk5SekVWUk1OZy9Kcm9oZDNl?= =?utf-8?B?ZmJsVjdaRk1nS3dyL3J0cmhKa2E3S2VYVkVSQjhNQjBHWHd2Z2lrZm12QkE3?= =?utf-8?B?ZFpFRjJxVlZnZGJFU2QybUZmWGYxNXYyZ0hRc2FxeVBnWGRSRTZEUTlpZm51?= =?utf-8?Q?gTNEEyP+rmAG8Lpx7x?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 611cde3c-4354-4642-4af4-08de63086b17 X-MS-Exchange-CrossTenant-AuthSource: BN9PR12MB5179.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Feb 2026 09:41:34.5561 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: hGH3o3djcjNYottAvwBwV5gNUfbE0pHcHaAF7Dpfbw0sJ/x0dGaatPadhnDTthtJIBsfux4LiDxnJPgxGfOH3A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB7990 >>> Hi Sumit, >>> >>> I am thinking that maybe it is better to call these two sysfs interface >>> 'min_freq' and 'max_freq' as users read and write khz instead of raw >>> value. >> Thanks for the suggestion. >> Kept min_perf/max_perf to match the CPPC register names >> (MIN_PERF/MAX_PERF), making it clear to users familiar with >> CPPC what's being controlled. >> The kHz unit is documented in the ABI. >> >> Thank you, >> Sumit Gupta > On my x86 machine with kernel 6.18.5, the kernel is exposing raw values: > >> grep . /sys/devices/system/cpu/cpu0/acpi_cppc/* > /sys/devices/system/cpu/cpu0/acpi_cppc/feedback_ctrs:ref:342904018856568 > del:437439724183386 > /sys/devices/system/cpu/cpu0/acpi_cppc/guaranteed_perf:63 > /sys/devices/system/cpu/cpu0/acpi_cppc/highest_perf:88 > /sys/devices/system/cpu/cpu0/acpi_cppc/lowest_freq:0 > /sys/devices/system/cpu/cpu0/acpi_cppc/lowest_nonlinear_perf:36 > /sys/devices/system/cpu/cpu0/acpi_cppc/lowest_perf:1 > /sys/devices/system/cpu/cpu0/acpi_cppc/nominal_freq:3900 > /sys/devices/system/cpu/cpu0/acpi_cppc/nominal_perf:62 > /sys/devices/system/cpu/cpu0/acpi_cppc/reference_perf:62 > /sys/devices/system/cpu/cpu0/acpi_cppc/wraparound_time:18446744073709551615 > > It would be surprising for a nearby sysfs interface with very similar > names to use kHz instead. > > Thanks, > > Russell Haley I can rename to either of the below: - min/max_freq: might be confused with scaling_min/max_freq. - min/max_perf_freq: keeps the CPPC register association clear. Rafael, Any preferences here? Thank you, Sumit Gupta