Memory architecture with policy based data storage

• US 8,595,463 B2
• Filed: 09/15/2010
• Issued: 11/26/2013
• Est. Priority Date: 09/15/2010
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Tremaine, Robert B., Wisniewski, Robert W.
• Primary Examiner(s): Farrokh, Hashem
• Application Number:
  US12/882,551
• Publication Number:
  US 20120066473A1
• Time in Patent Office: 1,168 Days
• Field of Search: 711/203, 711/103
• US Class Current: 711/203
• CPC Class Codes: G06F 12/06 Addressing a physical block of locations, e.g. base addressing, module addressing, memory dedication G06F12/08 takes precedence
• CPC Class Codes: G06F 12/10 Address translation
• CPC Class Codes: G06F 13/1694 Configuration of memory controller to different memory types
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A computing system and methods for memory management are presented. A memory or an I/O controller receives a write request where the data two be written is associated with an address. Hint information may be associated with the address and may relate to memory characteristics such as an historical, O/S direction, data priority, job priority, job importance, job category, memory type, I/O sender ID, latency, power, write cost, or read cost components. The memory controller may interrogate the hint information to determine where (e.g., what memory type or class) to store the associated data. Data is therefore efficiently stored within the system. The hint information may also be used to track post-write information and may be interrogated to determine if a data migration should occur and to which new memory type or class the data should be moved.

Claims

1. A method of memory management comprising:

interrogating, with a memory space controller, memory characteristic information comprised within an excess portion of a virtual address associated with a data store request to determine a memory type to which data is to be stored in a memory space comprising one or more memory types;

subsequent to the memory space controller determining the memory type to which data is to be stored, mapping the virtual address with a physical address associated with the determined memory type;

storing data associated with the data store request to the determined memory type;

clearing the memory characteristic information used to determine the memory type to which data is to be stored from the excess portion; and

storing post-write memory characteristic information to the excess portion.

2. The method of claim 1 further comprising:

determining whether the data should be migrated to a different memory type.

3. The method of claim 2 wherein determining whether the data should be migrated to a different memory type further comprises:

interrogating the post-write memory characteristic information to determine a suggested memory type.

4. The method of claim 3 wherein determining whether the data should be migrated to a different memory type further comprises:

comparing the memory type where the data is currently stored with the suggested memory type.

5. The method of claim 2 wherein the post-write memory characteristic information comprises multiple post-write components that are used to categorize the memory space or to categorize the data in the memory space.

6. The method of claim 5 wherein the memory characteristic information post-write components are selected from the group consisting of:

a historical component, a O/S direction component, an access frequency component, a data age component, a data priority component, a job priority component, a job importance component, a job category component, a requester identification component, a latency component, a power component, a write cost component, and a read cost component.

7. The method of claim 1 further comprising:

determining the availability of the excess portion to accept additional post-write memory characteristic information.

8. The method of claim 7 further comprises:

adding additional post-write memory characteristic information to the excess portion.

9. The method of claim 1 further comprising:

maintaining the post-write memory characteristic information in a table that associates the virtual address to a physical address within the memory type where the data is stored.

10. The method of claim 9 wherein the table is located in the memory space controller.

11. The method of claim 1 wherein the memory space controller is an input/output controller to a memory space comprising one or more different memory types.

12. The method of claim 1 further comprising:

determining if the virtual address includes an excess portion comprising the memory characteristic information.

13. The method of claim 1 further comprising:

determining the availability of the excess portion to accept additional memory characteristic information.

14. The method of claim 13 further comprising:

adding additional memory characteristic information to the excess portion.

15. The method of claim 1 wherein memory characteristic information comprises multiple components that are used to categorize the memory space or to categorize data stored in the memory space.

16. The method of claim 1 wherein the memory space controller further comprises a table that maps the virtual address with the physical address associated with the determined memory type.

17. The method of claim 1 wherein the memory characteristic information components are selected from the group consisting of:

a historical component, a O/S direction component, a data priority component, a job priority component, a job importance component, a job category component, a requester identification component, a latency component, a power component, a write cost component, and a read cost component.

18. A memory system comprising:

a memory space having one or more different memory types; and

a memory space controller configured to;

interrogate memory characteristic information comprised within an excess portion of a virtual address associated with a data store request to determine a memory type to which data is to be stored;

subsequent to determining the memory type to which data is to be stored, map the virtual address with a physical address associated with the determined memory type;

store data associated with the data store request to a determined memory type; and

clear the memory characteristic information used to determine the memory type to which data is to be stored from the excess portion; and

store post-write memory characteristic information to the excess portion.

19. The memory system of claim 18 wherein the memory space controller is further configured to store additional memory characteristic information within the excess portion of the virtual address.

20. The memory system of claim 19 wherein the memory space controller comprises:

a table that maps the virtual address with the physical address associated with the determined memory type.