Register restoration using transactional memory register snapshots
View Patent ↗Register restoration using transactional memory register snapshots. An indication that a transaction is to be initiated is obtained. Based on obtaining the indication, a determination is made as to whether register restoration is in active use. Based on obtaining the indication and determining register restoration is in active use, register restoration is deactivated. To recover one or more architected registers of the transaction, a transactional rollback snapshot is created.
1. A computer-implemented method of facilitating processing within a computing environment, the computer-implemented method comprising:
obtaining an indication that a transaction is to be initiated, the indication comprising a transaction begin instruction issued to begin the transaction;
determining, based on obtaining the indication, whether register restoration is in active use; and
deactivating register restoration, based on obtaining the indication that the transaction is to be initiated and determining register restoration is in active use, wherein the transaction begin instruction takes priority in indicating one or more registers to be saved.
2. The computer-implemented method of claim 1 , further comprising creating a transactional rollback snapshot to be used to recover one or more architected registers of the transaction.
3. The computer-implemented method of claim 2 , wherein the one or more architected registers include one or more architected registers specified by the transaction begin instruction initiating the transaction.
4. The computer-implemented method of claim 2 , further comprising initiating tracking of transactional state.
5. The computer-implemented method of claim 4 , wherein the transactional state includes at least one of a transactional state buffer and transaction begin instructions.
6. The computer-implemented method of claim 1 , wherein register restoration uses a restoration snapshot to recover one or more architected registers indicated by a restore request, the restoration snapshot including a mapping of the one or more architected registers to one or more physical registers.
7. The computer-implemented method of claim 1 , wherein the determining whether register restoration is in active use comprises checking an indicator.
8. The computer-implemented method of claim 1 , wherein the determining whether register restoration is in active use comprises checking whether a restoration snapshot has been created based on a store request, the restoration snapshot including a mapping of the one or more architected registers to one or more physical registers.
9. The computer-implemented method of claim 1 , further comprising using transactional interference tracking to track changes to in-memory buffers corresponding to one or more registers previously saved in memory.
10. The computer-implemented method of claim 1 , further comprising using transactional execution processing to restore one or more architected registers based on a restoration request.
11. The computer-implemented method of claim 10 , further comprising using the transactional execution processing to roll back processing of the transaction.