GetProcessInformation ProcessPowerThrottling does not seem to work

Question

GetProcessInformation ProcessPowerThrottling does not seem to work

Mike Sullivan 26

Hi. trying to examine the ProcessPowerThrottling structure because I want to make sure I am changing it. VS2019, SDK 10.0.22000.0
The Get fails, the Set succeeds (or so it says)

PROCESS_POWER_THROTTLING_STATE PowerThrottling;

// ProcessPowerThrottling - get PROCESS_POWER_THROTTLING_EXECUTION_SPEED
RtlZeroMemory(&PowerThrottling, sizeof(PROCESS_POWER_THROTTLING_STATE));
PowerThrottling.Version = PROCESS_POWER_THROTTLING_CURRENT_VERSION;
passFail = GetProcessInformation(
    GetCurrentProcess(),
    ProcessPowerThrottling,
    &PowerThrottling,
    sizeof(PROCESS_POWER_THROTTLING_STATE));

std::cout << "Get PowerThrottling, passFail:" << passFail << std::endl;
if (!passFail) {
    DWORD dw = GetLastError();
    std::cout << "PowerThrottling, failed:" << dw << std::endl;
}

output is

Get PowerThrottling, passFail:0
PowerThrottling, failed:87
Version:1
ControlMask:0
StateMask:0

David Lowndes 4,726 Reputation points

2022-04-01T23:15:23.59+00:00

FWIW, I get the same result.
I'm not sure from the error code (87 - The parameter is incorrect.) quite what parameter would be incorrect since equivalent code getting ProcessAppMemoryInfo works.
Mike Sullivan 26 Reputation points

2022-04-04T14:17:45.467+00:00

Thanks for the confirmation. GetProcessInformation succeeds for ProcessAppMemoryInfo, ProcessProtectionLevelInfo and even the lowly ProcessLeapSecondInfo.
David Lowndes 4,726 Reputation points

2022-04-04T14:35:14.59+00:00

I've queried the documentation to ask whether that option is applicable to GetProcessInformation - hopefully the documentation will be updated to clarify things if it is the case that it's not applicable.

Answer accepted by question author

2 additional answers

Your answer

David Lowndes 4,726 Reputation points

2022-04-01T23:15:23.59+00:00

FWIW, I get the same result.
I'm not sure from the error code (87 - The parameter is incorrect.) quite what parameter would be incorrect since equivalent code getting ProcessAppMemoryInfo works.
Mike Sullivan 26 Reputation points

2022-04-04T14:17:45.467+00:00

Thanks for the confirmation. GetProcessInformation succeeds for ProcessAppMemoryInfo, ProcessProtectionLevelInfo and even the lowly ProcessLeapSecondInfo.
David Lowndes 4,726 Reputation points

2022-04-04T14:35:14.59+00:00

I've queried the documentation to ask whether that option is applicable to GetProcessInformation - hopefully the documentation will be updated to clarify things if it is the case that it's not applicable.

Answer 1

Alexey Samokhin 81

I just checked on Windows 11 22H2, build 22621.521, GetProcessInformation API with ProcessPowerThrottling parameter works as expected.

Answer 2

Hi,

Welcome to Microsoft Q&A!

This is document content issue in the statement of GetProcessInformation() API. Actually ProcessPowerThrottling is not a supported parameter in GetProcessInformation() API, but this is only used in SetProcessInformation() API. This is also claimed in the documentation of PROCESS_POWER_THROTTLING_STATE structure.

According to the code of GetProcessInformation(), it will check ProcessInformationClass parameter for ProcessMemoryPriority / ProcessAppMemoryInfo / ProcessInPrivateInfo / ProcessProtectionLevelInfo / ProcessLeapSecondInfo / ProcessMachineTypeInfo, and other values will be treated as STATUS_INVALID_INFO_CLASS which eventually returns ERROR_INVALID_PARAMETER (0x57) in GetLastError().

And I'm trying to report document content issue.

Best Regards,

Jeanine

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Mike Sullivan 26 Reputation points

2022-04-13T13:40:28.753+00:00

Thank you for your answer.
It seems to me that there are two ways to "fix" this.

Add the GetProcessInformation ProcessPowerThrottling option to the code,
or

Change the documentation to reflect the fact that not all SetProcessInformation options have a corresponding GetProcessInformation.

IMO: I expect that most developers would expect MSFT to expand the Get function. This is especially true because the Get already exists for most GetProcessInformation() options. Regarding the ProcessPowerThrottling, it is a little difficult to actually prove (and test) which state(s) are selected, so a Get function would be very useful.

Thanks again.

Answer 3

Castorix31 91,746

ProcessPowerThrottling seems to be valid only for SetProcessInformation;
For GetProcessInformation, it returns first :

RtlNtStatusToDosError(STATUS_INVALID_INFO_CLASS)

(then ERROR_INVALID_PARAMETER)

Mike Sullivan 26 Reputation points

2022-04-04T14:14:31.177+00:00

thanks for the information. However, I do not think this qualifies as an "answer" - it just confirms that something is broken. The documentation states that this should work
nf-processthreadsapi-getprocessinformation

MSFT added support for PROCESS_POWER_THROTTLING_IGNORE_TIMER_RESOLUTION in the PROCESS_POWER_THROTTLING_STATE (as of Oct 2021, SDK 10.0.22000.0). It is possible that they broke something in the GetProcessInformation.

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GetProcessInformation ProcessPowerThrottling does not seem to work

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