Support in rr-debugger for not recording a subprocess?

Question

I am using Mozilla's rr-debugger to record a relatively simple process that forks and exec's a heavyweight subprocess. I only want to record the initial process. Since it only interacts with the subprocess by reading its stdout, it would be more efficient (record logs and cpu-wise) to leave the subprocess out from the record trace. Is this possible ? By default rr records the complete process tree apparently.

Answer 1

One way is by modifying the subproces command lines so instead of mainapp forking and running subapp --subargs, mainapp runs rr record --nested=release subapp --subargs.

--nested=release will result in the inner rr running the child without recording it.