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STDB is a seatar applications, so Arena have to works fine with seastar.

so we can easily find out the most arena-cost Function/Method.

ref: https://en.cppreference.com/w/cpp/utility/source_location

note: std::source_location will get supported from gcc 11.

if the OS's memory is in pool state, and sometimes the malloc/alloc return null or throw bad_alloc exception.

1. Arena should work correct. and give it some solutions, such as waiting? or return nullptr, or throw a exception?
2. Arena's client should have a solution to handle the Arena's failure.
3. STDB is high memory application, and because of seastar memory pools were isolated between CPU cores, so no memory can be alloced is a normal status.