Code Cloning Tracing is a new software annotation method that makes it possible to collect traces from time consuming applications. To this end, Code Cloning Tracing provides instrumented programs with two execution modes: a low overhead “no-trace collection” mode which serves to position the application in an interesting state with regard to tracing, and a “trace collection” mode. This paper details the Code Cloning Tracing method and presents calvin, our first implementation. On the SPEC95 suite, calvin exhibits low execution slowdown factors in “no-trace collection” mode varying from 1.02 to 2.09.