Demote instruction for relinquishing cache line ownership
First Claim
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1. A computer implemented method for relinquishing, by a selected processor, the selected processor'"'"'s own exclusive ownership of a specified cache line, the selected processor configured to be a processor of a multi-processor system, each processor of the multi-processor system having a respective private cache, the method comprising:
- executing, by the selected processor, a demote instruction of a software program, the demote instruction specifying an address of a specified cache line, the executing the demote instruction by the selected processor comprising;
based on the computer system determining that the specified cache line in the selected private cache is exclusively owned by the selected processor, the executing the demote instruction, by the selected processor, causing the selected processor'"'"'s exclusive ownership of the cache line in the selected private cache to be relinquished.
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Abstract
A computer system processor of a multi-processor computer system having cache subsystem, executes a demote instruction to cause a cache line exclusively owned by the computer system processor to become shared or read-only in the cache subsystem.
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Citations
11 Claims
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1. A computer implemented method for relinquishing, by a selected processor, the selected processor'"'"'s own exclusive ownership of a specified cache line, the selected processor configured to be a processor of a multi-processor system, each processor of the multi-processor system having a respective private cache, the method comprising:
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executing, by the selected processor, a demote instruction of a software program, the demote instruction specifying an address of a specified cache line, the executing the demote instruction by the selected processor comprising; based on the computer system determining that the specified cache line in the selected private cache is exclusively owned by the selected processor, the executing the demote instruction, by the selected processor, causing the selected processor'"'"'s exclusive ownership of the cache line in the selected private cache to be relinquished. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification