Microsoft Corporation
Facilitating recording a trace file of code execution using index bits in a processor cache

Abstract:

Facilitating recording a trace of code execution using a processor cache. A method includes identifying an operation by a processing unit on a line of the cache. Based on identifying the operation, accounting bits for the cache line are set. Setting the accounting bits includes (i) setting the accounting bits to a reserved value when the operation is a write and tracing is disabled, (ii) setting the accounting bits to an index of the processing unit when the operation is a write and the accounting bits for the cache line are set to a value other than the index of the processing unit, or (iii) setting the accounting bits to the index of the processing unit when the operation is a read that is consumed by the processing unit and the accounting bits for the cache line are set to a value other than the index of the processing unit.