ACPI PROCESSOR AGGREGATOR DRIVER

So Shaohua Li went back and implemented this functionality as a driver instead. There are no open issues. Thermal zones To support ACPI thermal management, the system designer logically partitions a hardware platform into one or more physical regions called thermal zones. The pursuit of practicality over aesthetic qualities; a concentration on facts rather than emotions or ideals. The ACPI processor aggregator driver. Posted Oct 8,

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It’s a bit of a hack, but it gets the job done, and aggregatof is not destructive to system state the way hot-unplugging the CPU would be.

Intel Processor Vendor-Specific ACPI

For example, a UEFI call to get the time should return the same time that the operating system would get by using the Time and Alarm device. Sensor devices track the temperature in each thermal zone. For more information, see section 8. And that’s where things stand. Posted Oct 16, Optionally, receive notifications of additional temperature threshold crossings: The ACPI processor aggregator driver.

Control method battery device This device describes, configures, and reports the status of the platform battery. Posted Oct 8, The driver is little loved, but it will also be little used, can be replaced with a better mechanism if the right people care, and, in the mean time, it may solve a real problem for some users. Lid device This device describes and reports the status of a clamshell device’s lid. So the ACPI “driver” is in the mainline for now. These changes, it seems, were little loved; that was the patch that Peter Zijlstra blocked outright.

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The story goes something like this. Optionally, describe the thermal zone’s active cooling behavior: For more information, see section 9. Read about this change in our blog post.

Logical processor idling as a thermal mitigation The platform can indicate to the operating system that processor cores in the thermal zone should be idled instead of throttled. To support ACPI thermal management, the system designer logically partitions a hardware platform into one or more physical regions called thermal zones.

Feedback We’d love to hear your thoughts. And it may stay that way; Linus said: So Shaohua Li went back and implemented this functionality as a driver instead.

For more information, aggrdgator section For more information, see the following:. The pursuit of practicality over aesthetic qualities; a concentration on facts rather than emotions or ideals.

These actions can be categorized as either passive cooling or active cooling.

In fact, the only reason the scheduler people even know about it is that Len at first tried to do something more invasive, and was shot down. If the ACPI hardware starts sounding the red alert, this driver will create a top-priority realtime thread and aggrrgator it to the CPU that is to be idled.

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The platform can indicate to the operating system that processor cores in the thermal zone should be idled instead of throttled. Product feedback Sign in to give documentation feedback.

The ACPI processor aggregator driver []

Our new feedback system is built on GitHub Issues. The ACPI folks had originally proposed putting some hacks into the scheduler to implement this functionality.

This device describes and reports the status of a clamshell device’s lid. ACPI thermal zones A thermal zone is defined to include child objects that do the following: Specify thermal thresholds at which actions must be taken: Report the thermal zone’s temperature: