Dynamic memory refresh interval to reduce bandwidth penalty

1. A method, comprising:

identifying, by a controller coupled to a dynamic memory system via a communication channel, a plurality of memory regions in the dynamic memory system, the plurality of memory regions respectively storing a plurality of types of data, wherein a first memory region in the plurality of memory regions stores user data of a first type, and a second memory region in the plurality of memory regions stores user data of a second type, and wherein the user data of the first type represents media for a media player, and the user data of the second type contains instructions of applications;

reaching a decision, by the controller, to reduce memory bandwidth used to refresh the dynamic memory system;

in response to the decision, reducing, by the controller, a rate to refresh at least one of the plurality of memory regions based on a type of user data stored in the one of the plurality of memory regions and a current temperature of the one of the plurality of memory regions;

refreshing the first memory region in the plurality of memory regions at a first frequency; and

refreshing the second memory region in the plurality of memory regions at a second frequency different from the first frequency.

2. The method of claim 1 , further comprising:

refreshing the at least one of the plurality of memory regions at a reduced rate.

3. The method of claim 2 , wherein the refreshing is performed by repeating a refreshing operation at a time interval determined by the reduced rate; and the refreshing operation includes:

reading data from a memory location; and

writing the data back to the memory location.

4. The method of claim 3 , wherein each of the plurality of memory regions includes dynamic random access memory.

5. The method of claim 1 , wherein the first frequency is lower than the second frequency.

6. The method of claim 5 , wherein the first frequency is below a threshold; the second frequency is no less than the threshold; and refreshing the dynamic memory system at the second frequency is sufficient to prevent data corruption; and refreshing the dynamic memory system at the first frequency is insufficient to prevent data corruption.

7. The method of claim 5 , wherein the user data of the first type is more error tolerant than the user data of the second type.

8. The method of claim 1 , further comprising:

partitioning memory in the dynamic memory system into the plurality of regions pre-associated with the plurality of types of data; and

storing data in the plurality of regions according to types of the data.

9. A system, comprising:

a dynamic memory system having a plurality of memory regions respectively storing a plurality of types of data, wherein a first memory region in the plurality of memory regions stores data of a first type, and a second memory region in the plurality of memory regions stores data of a second type; and

a controller coupled to the dynamic memory system via a communication channel and operatively configured to:

monitor usages of memory access bandwidth of the plurality of memory regions;

determine to reduce memory bandwidth used by refreshing the dynamic memory system; and

reduce a refresh rate of at least one of the plurality of memory regions based on a type of data stored in the one of the plurality of memory regions and a current temperature of the one of the plurality of memory regions;

wherein each of the plurality of memory regions includes dynamic random access memory; and the controller is further configured to:

refresh the first memory region in the plurality of memory regions at a first frequency; and

refresh the second memory region in the plurality of memory regions at a second frequency different from the first frequency.

10. The system of claim 9 , wherein each of the plurality of memory regions includes dynamic random access memory; and the controller is further configured to:

refresh the at least one of the plurality of memory regions at a reduced rate.

11. The system of claim 10 , wherein a refreshing operation is repeated at a time interval determined by the reduced rate; and the refreshing operation includes:

reading data from a memory location; and

writing the data back to the memory location.

12. The system of claim 9 , wherein the first frequency is lower than the second frequency.

13. The system of claim 12 , wherein the first frequency is below a threshold; the second frequency is no less than the threshold; and refreshing the dynamic memory system at the second frequency is sufficient to prevent data corruption; and refreshing the dynamic memory system at the first frequency is insufficient to prevent data corruption.

14. The system of claim 12 , wherein the data of the first type is more error tolerant than the data of the second type.

15. The system of claim 12 , wherein the data of the first type represents media for a media player; and the data of the second type contains instructions of applications.

16. A non-transitory computer-readable storage medium storing instructions that, when executed by a processing device, cause the processing device to perform a method, the method comprising:

partitioning memory of a dynamic memory system into a plurality of regions pre-associated with a plurality of types of data, wherein a first memory region in a plurality of memory regions stores data of a first type, and a second memory region in the plurality of memory regions stores data of a second type, and wherein the data of the first type represents media for a media player, and the data of the second type contains instructions of applications;

storing data in the plurality of regions according to types of the data;

monitoring memory bandwidth usages of the dynamic memory system, wherein the controller refreshes the dynamic memory system;

determining to reduce bandwidth penalty caused by refreshing the dynamic memory system; and

reducing a refresh rate of at least one of the plurality of memory regions in accordance with a type of data stored in the one of the plurality of memory regions and a current temperature of the one of the plurality of memory regions.