Methods and apparatuses for operating a data processing system

• US 9,317,090 B2
• Filed: 04/27/2015
• Issued: 04/19/2016
• Est. Priority Date: 08/15/2003
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Culbert, Michael, Cox, Keith Alan, Howard, Brian, de Cesare, Josh, Williams, Richard Charles, Falkenburg, Dave Robbins, Huang, Daisie Iris, Radcliffe, David
• Primary Examiner(s): Bae, Ji H
• Application Number:
  US14/697,471
• Publication Number:
  US 20150338892A1
• Time in Patent Office: 358 Days
• Field of Search: 713/300, 713/320, 713/322, 718/102
• US Class Current: 1/1
• CPC Class Codes: G05D 23/1934 each space being provided with one sensor acting on one or more control means
• CPC Class Codes: G05D 23/24 the sensing element having a resistance varying with temperature, e.g. a thermistor
• CPC Class Codes: G06F 1/10 Distribution of clock signals , e.g. skew
• CPC Class Codes: G06F 1/20 Cooling means
• CPC Class Codes: G06F 1/206 comprising thermal management
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/324 by lowering clock frequency
• CPC Class Codes: G06F 1/329 by task scheduling
• CPC Class Codes: G06F 1/3296 by lowering the supply or operating voltage
• CPC Class Codes: G08G 1/167 Driving aids for lane monitoring, lane changing, e.g. blind spot detection
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y10S 706/90 Fuzzy logic

Abstract

Methods and apparatuses to manage working states of a data processing system. At least one embodiment of the present invention includes a data processing system with one or more sensors (e.g., physical sensors such as tachometer and thermistors, and logical sensors such as CPU load) for fine grain control of one or more components (e.g., processor, fan, hard drive, optical drive) of the system for working conditions that balance various goals (e.g., user preferences, performance, power consumption, thermal constraints, acoustic noise). In one example, the clock frequency and core voltage for a processor are actively managed to balance performance and power consumption (heat generation) without a significant latency. In one example, the speed of a cooling fan is actively managed to balance cooling effort and noise (and/or power consumption).

Claims

1. A non-transitory computer readable medium storing computer instructions which when executed by a data processing system cause the data processing system to perform a method, the method comprising:

receiving load information about processing loads for one or more processing units;

receiving, from one or more thermal sensors, thermal data about the data processing system;

transitioning between multiple power states for each of the one or more processing units based on the load information and the thermal data, the multiple power states including multiple states with different processor voltages or processor frequencies, and wherein the data processing system is configured to transition to a lower power state to reduce heat produced by the data processing system;

throttling thread scheduling based on the load information.

2. The medium as in claim 1 wherein the one or more thermal sensors determine a temperature and wherein the load information is provided by software, and wherein each of the multiple power states is a working state of the one or more processing units.

3. The medium of claim 2 wherein the data processing system comprises a touchscreen coupled to the one or more processing units.

4. The medium of claim 2 wherein the throttling of thread scheduling is performed by a software component of an operating system.

5. The medium of claim 1 wherein the multiple power states comprise an idle state and a plurality of working states for each of the processing units.

6. The medium of claim 5 wherein the data processing system includes a plurality of processing units, each of which is independently transitioned between multiple power states by an operating system.

7. The medium of claim 6 wherein each processing unit in the plurality of processing units is in a working state when there are threads waiting to be scheduled on the processing unit.

8. The medium of claim 7 wherein the throttling of thread scheduling is based on a priority list and is performed by the operating system.

9. The medium of claim 8 wherein the data processing system comprises a touchscreen coupled to the plurality of processing units and the plurality of processing units comprises at least one graphics processing unit, and wherein the operating system causes the plurality of processing units to transition between multiple power states also based on one or more user preferences settings and battery life.

10. A method performed by a data processing system, the method comprising:

receiving load information about processing loads for one or more processing units;

receiving, from one or more thermal sensors, the mal data about the data processing system;

transitioning between multiple power states for each of the one or more processing units based on the load information and the thermal data, the multiple power states including multiple states with different processor voltages or processor frequencies, and wherein the data processing system is configured to transition to a lower power state to reduce heat produced by the data processing system;

throttling thread scheduling based on the load information.

11. The method as in claim 10 wherein the one or more thermal sensors determine a temperature and wherein the load information is provided by software, and wherein each of the multiple power states is a working state of the one or more processing units.

12. The method of claim 11 wherein the data processing system comprises a touchscreen coupled to the one or more processing units.

13. The method of claim 11 wherein the throttling of thread scheduling is performed by a software component of an operating system.

14. The method of claim 10 wherein the multiple power states comprise an idle state and a plurality of working states for each of the processing units.

15. The method of claim 14 wherein the data processing system includes a plurality of processing units, each of which is independently transitioned between multiple power states by an operating system.

16. The method of claim 15 wherein each processing unit in the plurality of processing units is in a working state when there are threads waiting to be scheduled on the processing unit.

17. The method of claim 16 wherein the throttling of thread scheduling is based on a priority list and is performed by the operating system.

18. The method of claim 17 wherein the data processing system comprises a touchscreen coupled to the plurality of processing units and the plurality of processing units comprises at least one graphics processing unit, and wherein the operating system causes the plurality of processing units to transition between multiple power settings also based on one or more user preferences settings and battery life.

19. A data processing system comprising:

a plurality of processing units;

a memory coupled to the plurality of processing units;

one or more thermal sensors coupled to at least one of the plurality of processing units; and

wherein the memory stores an operating system which receives thermal data about the data processing system and obtains load information about processing loads on the plurality of processing units, and wherein the operating system causes each processing unit in the plurality of processing units to transition independently between multiple power states based on the load information and the thermal data, and the operating system throttles thread scheduling based on the load information.

20. The system of claim 19 wherein the operating system causes each processing unit in the plurality of processing units to transition independently between multiple power states based also on one or more user preference settings and battery life.