Routing interrupts in a multi-node system

• US 20070038818A1
• Filed: 07/14/2005
• Published: 02/15/2007
• Est. Priority Date: 07/14/2005
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Greenfield, Todd, Kriegel, Jon
• Granted Patent: US 7,552,236 B2
• Time in Patent Office: Days
• US Class Current: 711/152
• CPC Class Codes: G06F 12/0831 using a bus scheme, e.g. with bus monitoring or watching means
• CPC Class Codes: G06F 13/24 using interrupt G06F13/32 takes precedence

Abstract

A method, apparatus, system, and signal-bearing medium that, in an embodiment, detect a new task priority for a processor, where the processor is connected to a first node, find a home node for the processor via a cluster to which the processor belongs, and send the new task priority to the home node if the home node is different from the first node. In another embodiment, an interrupt directed to a first processor is detected, the interrupt is determined to be redirectable, a home node for the first process is found via a cluster to which the first processor belongs, and an interrupt vector is sent to the home node if the home node is different from the first node.

Claims

1. A method comprising:

detecting a new task priority for a processor, wherein the processor is connected to a first node;

finding a home node for the processor via a cluster to which the processor belongs; and

sending the new task priority to the home node if the home node is different from the first node.

2. The method of claim 1, further comprising:

receiving the new task priority at the home node; and

storing the new task priority at the home node.

3. The method of claim 2, further comprising:

storing the new task priority at the home node if the home node is identical to the first node.

4. The method of claim 2, wherein the sending further comprises:

sending an identification of the processor to the home node.

5. The method of claim 4, wherein the storing further comprises:

associating the new task priority with the identification of the processor at the home node.

6. The method of claim 1, wherein the home node and the first node are connected via a scalability fabric.

7. The method of claim 1, wherein the home node is responsible for the cluster.

8. A signal-bearing medium comprising instructions, wherein the instructions when executed comprise:

detecting a new task priority for a processor, wherein the processor is connected to a first node;

finding a home node for the processor via a cluster to which the processor belongs; and

sending the new task priority to the home node if the home node is different from the first node.

9. The signal-bearing medium of claim 8, further comprising:

receiving the new task priority at the home node; and

storing the new task priority at the home node.

10. The signal-bearing medium of claim 9, further comprising:

storing the new task priority at the home node if the home node is identical to the first node.

11. The signal-bearing medium of claim 9, wherein the sending further comprises:

sending an identification of the processor to the home node.

12. The signal-bearing medium of claim 11, wherein the storing further comprises:

associating the new task priority with the identification of the processor at the home node.

13. The signal-bearing medium of claim 8, wherein the home node and the first node are connected via a scalability fabric.

14. The signal-bearing medium of claim 8, wherein the home node is responsible for the cluster.

15. A method for configuring a computer, comprising:

configuring the computer to detect an interrupt directed to a first processor, wherein the first processor is connected to a first node;

configuring the computer to determine that the interrupt is redirectable;

configuring the computer to find a home node for the first processor via a cluster to which the first processor belongs; and

configuring the computer to send an interrupt vector to the home node if the home node is different from the first node.

16. The method of claim 15, further comprising:

configuring the computer to receive the interrupt vector at the home node;

configuring the computer to select a second processor with a lowest task priority in the cluster.

17. The method of claim 16, further comprising:

configuring the computer to determine a second node to which the second processor is connected.

18. The method of claim 17, further comprising:

configuring the computer to send the interrupt vector to the second node.

19. The method of claim 18, further comprising:

configuring the computer to process the interrupt vector at the second node.

20. The method of claim 15, wherein the computer comprises the home node, the first node, and the second node, and wherein the home node, the first node, and the second node are connected via a scalability fabric.