Sequence numbering/ordering for function calls

[grantseltzer]

Currently there's no order for function calls, just whenever they come out of the kernel. It'd be useful to associate invocations in a map and order them.

[grantseltzer]

bpf-ringbuffers (as opposed to perf buffer which weaver uses) accomplishes this: https://www.kernel.org/doc/html/latest/bpf/ringbuf.html