MOBILE DEVICE AND A METHOD OF CONTROLLING THE MOBILE DEVICE

• US 20150026398A1
• Filed: 06/13/2014
• Published: 01/22/2015
• Est. Priority Date: 07/19/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Ho-Sung Kim
• Inventors: Kim, Ho-Sung
• Granted Patent: US 9,626,307 B2
• Time in Patent Office: Days
• US Class Current: 711/105
• CPC Class Codes: G06F 13/102 where the programme performs an interfacing function, e.g. device driver G06F13/105 takes precedence; scheduling within device drivers G06F9/52; contention policies within device drivers G06F9/4881
• CPC Class Codes: G06F 2213/3804 Memory card connected to a computer port directly or by means of a reader/writer
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A mobile device including: a storage device; a system-on-chip (SOC) including a central processing unit (CPU) and a memory interface configured to access the storage device in response to a request of the CPU; and a working memory including an input/output (I/O) scheduler and a device driver, the I/O scheduler configured to detect real time processing requests and store the real time processing requests in a sync queue, and detect non-real time processing requests and store the non-real time processing requests in an async queue, the device driver configured to adjust the performance of the mobile device based on the number of requests in the sync queue.

Claims

1. A mobile device, comprising:

a storage device;

a system-on-chip (SOC) including a central processing unit (CPU) and a memory interface configured to access the storage device in response to a request of the CPU; and

a working memory including an input/output (I/O) scheduler and a device driver,

the I/O scheduler configured to detect real time processing requests and store the real time processing requests in a sync queue, and detect non-real time processing requests and store the non-real time processing requests in an async queue,

the device driver configured to adjust the performance of the mobile device based on the number of requests in the sync queue.

2. The mobile device of claim 1, wherein when the sync queue and the async queue are empty a low power mode of the mobile device is entered.

3. The mobile device of claim 1, wherein the CPU is a heterogeneous multi-core CPU.

4. The mobile device of claim 1, wherein the working memory includes a dynamic random access memory (DRAM).

5. The mobile device of claim 1, wherein the storage device includes a nonvolatile memory device.

6. The mobile device of claim 1, wherein the synch queue includes a plurality of read requests.

7. The mobile device of claim 1, wherein the async queue includes a plurality of write requests.

8. The mobile device of claim 1, wherein the device driver adjusts the performance of the mobile device by changing a frequency of a driving clock of the CPU and changing a frequency of a data transfer clock of the memory interface.

9. The mobile device of claim 1, wherein the device driver adjusts the performance of the mobile device by changing a driving voltage of the SOC and a frequency of a driving clock of the CPU.

10. The mobile device of claim 1, wherein the device driver adjusts the performance of the mobile device by changing a number of cores operating in the CPU.

11. A mobile device, comprising:

a display screen configured to receive user input;

a working memory including a module, the module including an input/output (I/O) scheduler and a device driver,

the I/O scheduler including an async request queue configured to store non-real time processing requests by the user input and a sync request queue configured to store real time processing requests by the user input,

the device driver including a performance control module, the performance control module configured to select a performance control mode of the mobile device based on the number of requests stored in the sync queue.

12. The mobile device of claim 11, further comprising a central processing unit (CPU), and a memory interface configured to interface with a high speed data transfer device.

13. The mobile device of claim 12, wherein the high speed data transfer device is a storage device.

14. The mobile device of claim 12, wherein the performance control mode of the mobile device includes a dynamic voltage frequency scaling (DVFS) mode in which a driving voltage of the mobile device and a frequency of a driving clock of the CPU are adjusted.

15. The mobile device of claim 14, wherein the DVFS mode includes a plurality of levels, each level including a voltage and a frequency corresponding to a particular range of the number of requests in the synch queue, wherein a desired level is not activated until a prior activated level times out.

16. The mobile device of claim 12, wherein the performance control mode of the mobile device includes a quality of service (QOS) mode in which a frequency of a driving clock of the CPU and a frequency of a data transfer clock of the memory interface are adjusted.

17. The mobile device of claim 16, wherein the QOS mode includes a plurality of steps, each step including a CPU frequency and a memory interface frequency corresponding to a particular range of the number of requests in the synch queue, wherein a desired step is not activated until a prior activated step times out.

18. The mobile device of claim 12, wherein the performance control mode of the mobile device includes a CPU mode in which a number of cores operating in the CPU is adjusted.

19. The mobile device of claim 18, wherein the CPU mode includes a plurality of modes, each mode including a core of the CPU to be activated for a particular range of the number of requests in the synch queue, wherein a desired mode is not activated until a prior activated mode times out.

20. The mobile device of claim 11, wherein the display screen is a touch screen.

21. The mobile device of claim 11, wherein the module is a kernel.

22. A method of controlling a mobile device, comprising:

storing real time processing requests in a sync queue and non real time processing requests in an async queue of an input/output (I/O) scheduler of a working memory;

determining, with a device driver of the working memory, a performance control mode of the mobile device based on the number of requests stored in the sync queue;

increasing a data transfer rate between a memory interface and a storage device when the number of requests in the sync queue is greater than a predetermined threshold; and

decreasing the data transfer rate between the memory interface and the storage device when the number of requests in the sync queue is less than the predetermined threshold.

23. The method of claim 22, further comprising entering a low power mode of the mobile device when the sync queue and the async queue are empty.

24. The method of claim 22, wherein the sync queue includes a plurality of read requests and the async queue includes a plurality of write requests.

25. The method of claim 22, wherein the performance control mode of the mobile device includes a central processing unit (CPU) mode, a dynamic voltage frequency scaling (DVFS) mode and a quality of service (QOS) mode.

26. The method of claim 25, wherein the CPU mode is entered prior to the QOS mode and the DVFS mode.