Minimal library that bootstraps

[iapaddler]

No description provided.

[jrcheli]

It'd be possible to break libscope.so into pieces, but I'm not sure we'd get as much benefit as we'd hope. I assume the desire here is to make sure we're being responsible with our resource utilization, even if our library is loaded but not actively producing data.

If memory utilization is the primary reason this is being considered, some nuances of linux come into play:
o) Our library is a shared library, so if a machine has one process that uses our whole library or a hundred processes that use our library, the memory utilization will be similar.
o) With memory virtualization, memory alloc'd by the library does will not consume any physical memory until the process actually writes to memory (by increments of pages). If our library isn't active, it won't use many pages of physical memory, even if the library were to request a lot of virtual memory.

If the concern is the linking and loading time... w.r.t. linking time, the recent change toward got-hooking (#1039) should mean that we're not publishing many symbols any more, so the library's effect on linking time should be insignificant. w.r.t. loading, the largest segments of the library would simply be mapped into virtual memory so the load time would be very minimal.

If the concern is "unnecessary functionality" that some processes use and others don't... we have a small amount of code to handle technology-specific aspects of processes (go, java), but not enough to offer a meaningful savings if we refactored for this. Almost all of the code to support our two platforms (x86_64 and arm64) is already only built into the appropriate platform-specific build. Code to support TLS encryption isn't always configured to be used, but we've had earlier discussions where we decided not to have dependencies on external libraries if at all possible.

[seanvaleo]

Also: If the concern is visibility of libscope in the proc/*/maps file, adding a minimal library is not going to change the number of entries in the maps file; and will double the number of entries in the maps file of a scoped process.

[jrcheli]

I'm closing this with no action at the current time.