Configurable switches of instrumented functions/libraries

[mofeing]

Opted-in instrumented functions could be enabled by sections or libraries (e.g. instrument only the given functions or libraries).

I am thinking on using Preferences.jl for this.

[clasqui]

This will be very useful at initialization time, to register events, and setting up extrae, depending on the instrumented libraries. See for example

Extrae.jl/src/API.jl

Lines 32 to 38 in 63f845c

	## TODO: This setup should depend on isntrumentation options.
	## For example, if isntrumenting Distributed, here we setup the
	## Distributed functions to identify resources
	FFI.Extrae_set_numtasks_function(dist_numtasks)
	FFI.Extrae_set_taskid_function(dist_taskid)
	#register(DistributedEvent, "Distributed runtime call")
	#register(DistributedUsefulWorkEvent, "Workers workload execution")

[mofeing]

Definitely. This must be done on initialization.

What I have in my mind is that you could save for a project a profiling configuration using the Parameters.jl library.