Methods and apparatus for aging a command

• US 20060048158A1
• Filed: 07/29/2004
• Published: 03/02/2006
• Est. Priority Date: 07/29/2004
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Handlogten, Glen H.
• Application Number:
  US10/901,597
• Publication Number:
  US 20060048158A1
• Time in Patent Office: Days
• US Class Current: 718/104
• CPC Class Codes: G06F 9/5016 the resource being the memory

Abstract

In a first aspect, a first method is provided for servicing a command. The first method includes the steps of (1) accessing an activity count corresponding to a command selected for servicing, wherein the activity count indicates a number of times the command has been selected for servicing; (2) based on the activity count, updating a blocking threshold value; and (3) determining whether to service the command based on the activity count and the blocking threshold value. Numerous other aspects are provided.

Claims

1. A method for servicing a command, comprising:

accessing an activity count corresponding to a command selected for servicing, wherein the activity count indicates a number of times the command has been selected for servicing;

based on the activity count, updating a blocking threshold value; and

determining whether to service the command based on the activity count and the blocking threshold value.

2. The method of claim 1 wherein updating the blocking threshold value includes incrementing the blocking threshold value when the activity count reaches or exceeds one of a plurality of activity count thresholds.

3. The method of claim 1 further comprising updating the activity count of the selected command.

4. The method of claim 3 wherein updating the activity count of the selected command includes incrementing the activity count.

5. The method of claim 1 further comprising resetting the blocking threshold value.

6. The method of claim 1 further comprising, if the activity count corresponding to the selected command is less than the blocking threshold value, blocking the selected command from servicing.

7. The method of claim 1 further comprising, if the activity count corresponding to the selected command is greater than or equal to the blocking threshold value, servicing the selected command.

15. The method of claim 1 wherein the activity count indicates a number of times the command has been selected for servicing but has not yet completed.

8. An apparatus for servicing a command, comprising:

aging logic adapted to;

access an activity count corresponding to a command selected for servicing, wherein the activity count indicates a number of times the command has been selected for servicing;

based on the activity count, update a blocking threshold value; and

determine whether to service the command based on the activity count and the blocking threshold value.

9. The apparatus of claim 8 wherein the aging logic is further adapted to increment the blocking threshold value when the activity count reaches or exceeds one of a plurality of activity count thresholds.

10. The apparatus of claim 8 wherein the aging logic is further adapted to update the activity count of the selected command.

11. The apparatus of claim 10 wherein the aging logic is further adapted to increment the activity count.

12. The apparatus of claim 8 wherein the aging logic is further adapted to reset the blocking threshold value.

13. The apparatus of claim 8 wherein the aging logic is further adapted to, if the activity count corresponding to the selected command is less than the blocking threshold value, block the selected command from servicing.

14. The apparatus of claim 8 wherein the aging logic is further adapted to, if the activity count corresponding to the selected command is greater than or equal to the blocking threshold value, service the selected command.

16. The apparatus of claim 8 wherein the activity count indicates a number of times the command has been selected for servicing but has not yet completed.