SYSTEM OPERATION QUEUE FOR TRANSACTION

• US 20160378663A1
• Filed: 09/04/2015
• Published: 12/29/2016
• Est. Priority Date: 06/26/2015
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Bradbury, Jonathan D., Gschwind, Michael K., Schwarz, Eric M.
• Granted Patent: US 10,360,153 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 12/0811 with multilevel cache hierarchies
• CPC Class Codes: G06F 12/0833 in combination with broadcast means (e.g. for invalidation or updating)
• CPC Class Codes: G06F 12/084 with a shared cache
• CPC Class Codes: G06F 12/0875 with dedicated cache, e.g. instruction or stack
• CPC Class Codes: G06F 12/128 adapted to multidimensional cache systems, e.g. set-associative, multicache, multiset or multilevel
• CPC Class Codes: G06F 2212/314 In storage network, e.g. network attached cache
• CPC Class Codes: G06F 2212/621 Coherency control relating to peripheral accessing, e.g. from DMA or I/O device
• CPC Class Codes: G06F 9/3004 to perform operations on memory
• CPC Class Codes: G06F 9/30087 Synchronisation or serialisation instructions
• CPC Class Codes: G06F 9/3834 Maintaining memory consistency
• CPC Class Codes: G06F 9/466 Transaction processing
• CPC Class Codes: G06F 9/467 Transactional memory G06F9/528 takes precedence

Abstract

Embodiments relate to a system operation queue for a transaction. An aspect includes determining whether a system operation is part of an in-progress transaction of a central processing unit (CPU). Another aspect includes based on determining that the system operation is part of the in-progress transaction, storing the system operation in a system operation queue corresponding to the in-progress transaction. Yet another aspect includes, based on the in-progress transaction ending, processing the system operation in the system operation queue.

Claims

1. A computer implemented method for a system operation queue for a transaction, the method comprising:

determining whether a system operation is part of an in-progress transaction of a central processing unit (CPU);

based on determining that the system operation is part of the in-progress transaction, storing the system operation in a system operation queue corresponding to the in-progress transaction; and

based on the in-progress transaction ending, processing the system operation in the system operation queue.

2. The method of claim 1, wherein the system operation queue stores a plurality of system operations corresponding to the in-progress transaction, and further comprising processing each of the plurality of system operations in the system operation queue based on the in-progress transaction ending.

3. The method of claim 1, wherein processing the system operation comprises sending a broadcast notification regarding the system operation from the CPU to another CPU.

4. The method of claim 3, wherein the system operation comprises an instruction to flush an entry in a translation lookaside buffer (TLB), and wherein the broadcast notification comprises a TLB invalidate instruction.

5. The method of claim 1, wherein the system operation queue is stored in a transaction system operation queue logic that is in communication with an issue queue of the CPU, and wherein the determination of whether the system operation is part of an in-progress transaction is made based on the system operation being encountered in the issue queue.

6. The method of claim 5, wherein the transaction system operation queue logic stores a plurality of system operation queues, each of the plurality of system operation queues corresponding to a respective in-progress transaction.

7. The method of claim 6, wherein a number of the plurality of system operation queues is equal to a number of threads supported by the CPU.

8. The method of claim 1, wherein the system operation comprises an update to a control register.

9. The method of claim 1, further comprising, based on aborting of the in-progress transaction, flushing the system operation queue.