Implementation of thermal throttling logic

• US 7,721,128 B2
• Filed: 06/21/2006
• Issued: 05/18/2010
• Est. Priority Date: 11/29/2005
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Johns, Charles Ray, Wang, Michael Fan
• Primary Examiner(s): BUTLER, DENNIS
• Application Number:
  US11/425,472
• Publication Number:
  US 20070124622A1
• Time in Patent Office: 1,427 Days
• Field of Search: None
• US Class Current: 713/322
• CPC Class Codes: G01K 3/005 Circuits arrangements for indicating a predetermined temperature fire detection G08B17/00
• CPC Class Codes: G01K 7/015 using microstructures, e.g. made of silicon
• CPC Class Codes: G06F 1/206 comprising thermal management
• CPC Class Codes: G06F 1/324 by lowering clock frequency
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A computer implemented method, data processing system, and processor are provided for implementation of thermal throttling logic. A sensed temperature value is received from a digital thermal sensor representing a current temperature of a unit associated with the digital thermal sensor in the integrated circuit. The sensed temperature is reported as the current temperature in a status register. The unit in the integrated circuit is throttled in response to the current temperature exceeding a first predetermined value.

Claims

1. A computer implemented method for implementing thermal throttling logic in a heterogeneous multi-core processor that is implemented on a single integrated circuit chip, comprising:

providing, in each one of a plurality of cores that are included in the heterogeneous multi-core processor, a separate digital thermal sensor that senses a temperature in the digital thermal sensor'"'"'s respective one of the plurality of cores;

setting, in a throttle point register that is included in the processor and outside of the plurality of cores, a first throttling temperature that is used for a first one of the plurality of cores and a second throttling temperature that is used for a second one of the plurality of cores, wherein the first and second throttling temperatures are used at the same time;

receiving a sensed temperature value from a particular digital thermal sensor representing a particular current temperature of a particular one of the plurality of cores;

reporting the sensed temperature as the particular current temperature in a current temperature status register; and

responsive to the particular current temperature exceeding a particular throttling temperature of the particular one of the plurality of cores, throttling only the particular one of the plurality of cores.

2. The method of claim 1, wherein the throttle point register and the current temperature register are included in a thermal management control state machine residing in the processor and outside of the plurality of cores.

3. The method of claim 1, further comprising:

receiving a new sensed temperature from the particular digital thermal sensor;

determining if the new sensed temperature is less than an end throttling temperature; and

responsive to the new sensed temperature meeting the end throttling temperature, disabling a throttling mode in the particular one of the plurality of cores.

4. The method of claim 3, wherein the throttling mode includes a type of throttling mode to be initiated, an amount of throttling to be initiated, and a duration for the throttling mode to be initiated.

5. The method of claim 4, wherein the type of throttling mode is at least one of dynamic throttling disabled, normal operation, power processor element or synergistic processor element is always throttled, core stop safety disabled, or power processor element or synergistic processor element is always throttled and core stop safety disabled.

6. The method of claim 4, wherein the amount of throttling initiated is a percentage of time that the particular one of the plurality of cores is stopped versus time that the particular one of the plurality of cores is run.

7. The method of claim 4, wherein the duration for the throttling mode to be initiated is an actual number of clock cycles that the particular one of the plurality of cores stops and runs.

8. The method of claim 3, further comprising:

determining if the second sensed temperature sensed by the second digital thermal sensor in a second one of the plurality of cores is greater than or equal to the second throttling temperature;

responsive to the second sensed temperature meeting or exceeding the second throttling temperature, initiating a throttling mode in only the second one of the plurality of cores;

sensing, by the second digital thermal sensor, a new second temperature;

determining if the new second temperature is less than the end throttling temperature; and

responsive to the new second temperature being less than the end throttling temperature, disabling the throttling mode in only the second one of the plurality of cores.

9. The method of claim 1, further comprising:

monitoring for the issuance of an interrupt;

disabling the throttling mode so that the interrupt may be handled; and

responsive to the interrupt being handled, enabling the throttling mode.

10. The method of claim 1, further comprising:

further responsive to the sensed temperature meeting or exceeding the particular throttling temperature;

controlling a type of throttling of the particular one of the plurality of processor cores as indicted by settings included in a control register in the processor;

controlling an amount of throttling of the particular one of the plurality of processor cores as indicated by a stop time register that is included in the processor, wherein the stop time register specifies a number of clock cycles; and

controlling a duration of throttling of the particular one of the plurality of processor cores as indicated by settings included in a scale register included in the processor, wherein the scale register specifies a scale value; and

wherein when the particular one of the plurality of processor cores is throttled, the particular one of the plurality of processor cores is stopped for the number of clock cycles specified in the stop time register multiplied by the scale value specified by the scale register.

11. A data processing system comprising:

a bus;

a memory coupled to the bus, wherein the memory includes a set of instructions; and

a single integrated circuit chip on which is implemented a heterogeneous multi-core processor, wherein the processor is coupled to the bus, and wherein a separate digital thermal sensor is provided in each one of a plurality of cores that are included in the heterogeneous multi-core processor, wherein the separate digital thermal sensor senses a temperature in the digital thermal sensor'"'"'s respective one of the plurality of cores; and

further wherein the processor executes the set of instructions to;

set, in a throttle point register that is included in the processor and outside of the plurality of cores, a first throttling temperature that is used for a first one of the plurality of cores and a second throttling temperature that is used for a second one of the plurality of cores, wherein the first and second throttling temperatures are used at the same time;

receive a sensed temperature value from a particular digital thermal sensor representing a particular current temperature of a particular one of the plurality of cores;

report the sensed temperature as the particular current temperature in a current temperature status register; and

responsive to the particular current temperature exceeding a particular throttling temperature of the particular one of the plurality of cores, throttle only the particular one of the plurality of cores.

12. The system of claim 11, wherein the processor executes the set of instructions to receive a new sensed temperature from the particular digital thermal sensor;

determine if the new sensed temperature is less than an end throttling temperature; and

disable a throttling mode in the particular one of the plurality of cores in response to the new sensed temperature meeting the end throttling temperature.

13. The system of claim 11, wherein the processor executes the set of instructions to monitor for the issuance of an interrupt;

disable the throttling mode so that the interrupt may be handled; and

enable the throttling mode in response to the interrupt being handled.

14. The system of claim 11, wherein the processor executes the set of instructions to:

further responsive to the sensed temperature meeting or exceeding the particular throttling temperature;

control the type of throttling of the particular one of the plurality of processor cores as indicted by settings included in a control register in the processor;

control the amount of throttling of the particular one of the plurality of processor cores as indicated by a stop time register that is included in the processor, wherein the stop time register specifies a number of clock cycles; and

control the duration of throttling of the particular one of the plurality of processor cores as indicated by settings included in a scale register included in the processor,

wherein the scale register specifies a scale value; and

wherein when the particular one of the plurality of processor cores is throttled, the particular one of the plurality of processor cores is stopped for the number of clock cycles specified in the stop time register multiplied by the scale value specified by the scale register.

15. A heterogeneous multi-core processor that is implemented on a single integrated circuit chip, comprising:

a plurality of cores, wherein each one of the plurality of cores includes a separate digital thermal sensor that senses a temperature in the digital thermal sensor'"'"'s respective one of the plurality of cores;

a throttle point register that is included in the processor and outside of the plurality of cores in which is set a first throttling temperature that is used for a first one of the plurality of cores and a second throttling temperature that is used for a second one of the plurality of cores, wherein the first and second throttling temperatures are used at the same time;

a thermal management control state machine;

a comparator; and

a digital thermal sensor, wherein the processor executes a set of instructions to;

receive a sensed temperature value from a particular digital thermal sensor representing a particular current temperature of a particular one of the plurality of cores;

report, using the state machine, the sensed temperature as the particular current temperature in a current temperature status register; and

throttle, using the state machine, only the particular one of the plurality of cores responsive to the particular current temperature exceeding a particular throttling temperature of the particular one of the plurality of cores.

16. The processor of claim 15, wherein the processor executes the set of instructions to receive a new sensed temperature from the particular digital thermal sensor;

determine, using the state machine, if the new sensed temperature is less than an end throttling temperature; and

disable, using the state machine, a throttling mode in the particular one of the plurality of cores in response to the new sensed temperature meeting the end throttling temperature.

17. The processor of claim 16, wherein the processor executes the set of instructions to:

determine if the second sensed temperature sensed by a second digital thermal sensor in the second one of the plurality of cores is greater than or equal to the second throttling temperature;

responsive to the second sensed temperature meeting or exceeding the second throttling temperature, initiate a throttling mode in only the second one of the plurality of cores;

sense, by the second digital thermal sensor, a new second temperature;

determine if the new second temperature is less than the end throttling temperature; and

responsive to the new second temperature being less than the end throttling temperature, disable the throttling mode in only the second one of the plurality of cores.

18. The processor of claim 15, wherein the processor executes the set of instructions to monitor, using the state machine, for the issuance of an interrupt;

disable, using the state machine, the throttling mode so that the interrupt may be handled; and

enable, using the state machine, the throttling mode in response to the interrupt being handled.